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535
Cargo.lock
generated
535
Cargo.lock
generated
@@ -2,105 +2,12 @@
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|||||||
# It is not intended for manual editing.
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||||||
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|
||||||
checksum = "5e5032e24019045c762d3c0f28f5b6b8bbf38563a65908389bf7978758920897"
|
|
||||||
|
|
||||||
[[package]]
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|
||||||
name = "memchr"
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|
||||||
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|
|
||||||
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|
||||||
checksum = "f52b00d39961fc5b2736ea853c9cc86238e165017a493d1d5c8eac6bdc4cc273"
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|
||||||
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|
||||||
[[package]]
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[[package]]
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||||||
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||||||
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|
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||||||
@@ -361,62 +68,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
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|||||||
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||||||
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||||||
"libc",
|
"libc",
|
||||||
"log",
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|
||||||
"wasi",
|
"wasi",
|
||||||
"windows-sys 0.61.2",
|
"windows-sys 0.61.2",
|
||||||
]
|
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||||||
|
|
||||||
[[package]]
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|
||||||
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||||||
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||||||
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||||||
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|
||||||
[[package]]
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|
||||||
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||||||
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|
||||||
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|
|
||||||
"fsevent-sys",
|
|
||||||
"inotify",
|
|
||||||
"kqueue",
|
|
||||||
"libc",
|
|
||||||
"log",
|
|
||||||
"mio",
|
|
||||||
"notify-types",
|
|
||||||
"walkdir",
|
|
||||||
"windows-sys 0.60.2",
|
|
||||||
]
|
|
||||||
|
|
||||||
[[package]]
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|
||||||
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|
||||||
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||||||
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||||||
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||||||
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||||||
[[package]]
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||||||
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||||||
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||||||
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||||||
"autocfg",
|
|
||||||
]
|
|
||||||
|
|
||||||
[[package]]
|
|
||||||
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|
|
||||||
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|
||||||
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|
||||||
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|
|
||||||
|
|
||||||
[[package]]
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|
||||||
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|
||||||
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|
||||||
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|
||||||
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|
||||||
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|
||||||
[[package]]
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[[package]]
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||||||
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name = "parking_lot"
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||||||
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|
version = "0.12.5"
|
||||||
@@ -436,7 +91,7 @@ dependencies = [
|
|||||||
"cfg-if",
|
"cfg-if",
|
||||||
"libc",
|
"libc",
|
||||||
"redox_syscall",
|
"redox_syscall",
|
||||||
"smallvec 1.15.1",
|
"smallvec",
|
||||||
"windows-link",
|
"windows-link",
|
||||||
]
|
]
|
||||||
|
|
||||||
@@ -446,6 +101,15 @@ version = "0.2.16"
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|||||||
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source = "registry+https://github.com/rust-lang/crates.io-index"
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||||||
checksum = "3b3cff922bd51709b605d9ead9aa71031d81447142d828eb4a6eba76fe619f9b"
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checksum = "3b3cff922bd51709b605d9ead9aa71031d81447142d828eb4a6eba76fe619f9b"
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||||||
|
|
||||||
|
[[package]]
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||||||
|
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||||||
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||||||
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||||||
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||||||
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dependencies = [
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||||||
|
"zerocopy",
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||||||
|
]
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||||||
|
|
||||||
[[package]]
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[[package]]
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||||||
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|
name = "proc-macro2"
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||||||
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|
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|
||||||
@@ -465,27 +129,34 @@ dependencies = [
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|||||||
]
|
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|
||||||
|
|
||||||
[[package]]
|
[[package]]
|
||||||
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|
||||||
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||||||
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||||||
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||||||
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dependencies = [
|
||||||
|
"libc",
|
||||||
|
"rand_chacha",
|
||||||
|
"rand_core",
|
||||||
|
]
|
||||||
|
|
||||||
[[package]]
|
[[package]]
|
||||||
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|
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||||||
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||||||
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||||||
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||||||
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|
||||||
"chacha20",
|
"ppv-lite86",
|
||||||
"getrandom",
|
|
||||||
"rand_core",
|
"rand_core",
|
||||||
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|
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|
||||||
|
|
||||||
[[package]]
|
[[package]]
|
||||||
name = "rand_core"
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name = "rand_core"
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||||||
version = "0.10.0-rc-2"
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||||||
source = "registry+https://github.com/rust-lang/crates.io-index"
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||||||
checksum = "104a23e4e8b77312a823b6b5613edbac78397e2f34320bc7ac4277013ec4478e"
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||||||
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||||||
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"getrandom",
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||||||
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||||||
|
|
||||||
[[package]]
|
[[package]]
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||||||
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|
||||||
@@ -493,32 +164,7 @@ version = "0.5.18"
|
|||||||
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||||||
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||||||
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||||||
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|
||||||
|
|
||||||
[[package]]
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|
||||||
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|
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|
||||||
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|
||||||
[[package]]
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||||||
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||||||
"winapi-util",
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||||||
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||||||
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|
||||||
[[package]]
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|
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||||||
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|
||||||
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|
||||||
|
|
||||||
[[package]]
|
[[package]]
|
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@@ -527,67 +173,6 @@ version = "1.2.0"
|
|||||||
source = "registry+https://github.com/rust-lang/crates.io-index"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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||||||
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||||||
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|
||||||
[[package]]
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|
||||||
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|
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|
||||||
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|
||||||
"serde_core",
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|
||||||
"serde_derive",
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|
||||||
]
|
|
||||||
|
|
||||||
[[package]]
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|
||||||
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|
||||||
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||||||
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|
||||||
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|
||||||
"ahash",
|
|
||||||
"base64",
|
|
||||||
"encoding_rs_io",
|
|
||||||
"nohash-hasher",
|
|
||||||
"num-traits",
|
|
||||||
"ryu",
|
|
||||||
"saphyr-parser",
|
|
||||||
"serde",
|
|
||||||
"serde_json",
|
|
||||||
"smallvec 2.0.0-alpha.12",
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|
||||||
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|
|
||||||
|
|
||||||
[[package]]
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|
||||||
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|
||||||
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|
||||||
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|
||||||
"serde_derive",
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|
||||||
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|
|
||||||
|
|
||||||
[[package]]
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|
||||||
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|
||||||
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|
||||||
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|
||||||
"proc-macro2",
|
|
||||||
"quote",
|
|
||||||
"syn",
|
|
||||||
]
|
|
||||||
|
|
||||||
[[package]]
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|
||||||
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|
||||||
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|
||||||
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|
||||||
"itoa",
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|
||||||
"memchr",
|
|
||||||
"ryu",
|
|
||||||
"serde",
|
|
||||||
"serde_core",
|
|
||||||
]
|
|
||||||
|
|
||||||
[[package]]
|
[[package]]
|
||||||
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|
name = "signal-hook-registry"
|
||||||
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|
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|
||||||
@@ -603,12 +188,6 @@ version = "1.15.1"
|
|||||||
source = "registry+https://github.com/rust-lang/crates.io-index"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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||||||
checksum = "67b1b7a3b5fe4f1376887184045fcf45c69e92af734b7aaddc05fb777b6fbd03"
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checksum = "67b1b7a3b5fe4f1376887184045fcf45c69e92af734b7aaddc05fb777b6fbd03"
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||||||
|
|
||||||
[[package]]
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|
||||||
name = "smallvec"
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|
||||||
version = "2.0.0-alpha.12"
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|
||||||
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|
||||||
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|
||||||
|
|
||||||
[[package]]
|
[[package]]
|
||||||
name = "socket2"
|
name = "socket2"
|
||||||
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|
version = "0.6.1"
|
||||||
@@ -619,12 +198,6 @@ dependencies = [
|
|||||||
"windows-sys 0.60.2",
|
"windows-sys 0.60.2",
|
||||||
]
|
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|
||||||
|
|
||||||
[[package]]
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|
||||||
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|
||||||
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|
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|
||||||
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|
||||||
[[package]]
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[[package]]
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||||||
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|
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||||||
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||||||
@@ -670,52 +243,12 @@ version = "1.0.22"
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|||||||
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||||||
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||||||
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|
||||||
[[package]]
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||||||
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|
||||||
|
|
||||||
[[package]]
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|
||||||
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|
||||||
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|
||||||
|
|
||||||
[[package]]
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|
||||||
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|
||||||
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|
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|
||||||
"same-file",
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|
||||||
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|
||||||
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|
||||||
|
|
||||||
[[package]]
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[[package]]
|
||||||
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||||||
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|
||||||
[[package]]
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|
||||||
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|
||||||
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|
||||||
source = "registry+https://github.com/rust-lang/crates.io-index"
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|
||||||
checksum = "0562428422c63773dad2c345a1882263bbf4d65cf3f42e90921f787ef5ad58e7"
|
|
||||||
dependencies = [
|
|
||||||
"wit-bindgen",
|
|
||||||
]
|
|
||||||
|
|
||||||
[[package]]
|
|
||||||
name = "winapi-util"
|
|
||||||
version = "0.1.11"
|
|
||||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
|
||||||
checksum = "c2a7b1c03c876122aa43f3020e6c3c3ee5c05081c9a00739faf7503aeba10d22"
|
|
||||||
dependencies = [
|
|
||||||
"windows-sys 0.61.2",
|
|
||||||
]
|
|
||||||
|
|
||||||
[[package]]
|
[[package]]
|
||||||
name = "windows-link"
|
name = "windows-link"
|
||||||
version = "0.2.1"
|
version = "0.2.1"
|
||||||
@@ -805,12 +338,6 @@ version = "0.53.1"
|
|||||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||||
checksum = "d6bbff5f0aada427a1e5a6da5f1f98158182f26556f345ac9e04d36d0ebed650"
|
checksum = "d6bbff5f0aada427a1e5a6da5f1f98158182f26556f345ac9e04d36d0ebed650"
|
||||||
|
|
||||||
[[package]]
|
|
||||||
name = "wit-bindgen"
|
|
||||||
version = "0.46.0"
|
|
||||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
|
||||||
checksum = "f17a85883d4e6d00e8a97c586de764dabcc06133f7f1d55dce5cdc070ad7fe59"
|
|
||||||
|
|
||||||
[[package]]
|
[[package]]
|
||||||
name = "zerocopy"
|
name = "zerocopy"
|
||||||
version = "0.8.31"
|
version = "0.8.31"
|
||||||
|
|||||||
@@ -6,10 +6,4 @@ edition = "2024"
|
|||||||
[dependencies]
|
[dependencies]
|
||||||
anywho = "0.1.2"
|
anywho = "0.1.2"
|
||||||
tokio = { version = "1.48.0", features = ["full"] }
|
tokio = { version = "1.48.0", features = ["full"] }
|
||||||
rand = "0.10.0-rc.5"
|
rand = { version = "0.8", features = ["small_rng"] }
|
||||||
serde = { version = "1.0.228", features = ["derive"] }
|
|
||||||
cidr = "0.3.1"
|
|
||||||
serde-saphyr = "0.0.10"
|
|
||||||
arc-swap = "1.7.1"
|
|
||||||
clap = { version = "4.5.53", features = ["derive"] }
|
|
||||||
notify = "8.2.0"
|
|
||||||
|
|||||||
33
README.md
33
README.md
@@ -5,25 +5,10 @@ Production't graden't load balancer.
|
|||||||
|
|
||||||
## Todo
|
## Todo
|
||||||
- [ ] architecture astronauting
|
- [ ] architecture astronauting
|
||||||
- balancer module
|
|
||||||
- just the algorithms i guess
|
|
||||||
-
|
|
||||||
- backend module
|
|
||||||
- manages the backend pool
|
|
||||||
- deals with health / load check
|
|
||||||
- BackendPool for all the backends stored together
|
|
||||||
- Backend for individual backends
|
|
||||||
- has some methods used by balancer module to pick a suitable backend
|
|
||||||
- proxy module
|
|
||||||
- all the different supported protocols to handle
|
|
||||||
- will create a session / stream context structure (ConnectionContext)
|
|
||||||
- not globally tracked (this might change for UDP!)
|
|
||||||
- mainly some metadata
|
|
||||||
- config module
|
|
||||||
- set up all the stuff or something
|
|
||||||
- [ ] stream / session handling (i think wrapper around tokio TcpStream)
|
- [ ] stream / session handling (i think wrapper around tokio TcpStream)
|
||||||
- [ ] basic backend pooling
|
- [ ] basic backend pooling
|
||||||
- [ ] layer 4 load balancing
|
- [ ] layer 4 load balancing
|
||||||
|
- [ ] load balancing algorithm from the paper (https://www.wcse.org/WCSE_2018/W110.pdf)
|
||||||
|
|
||||||
## notes
|
## notes
|
||||||
tcp, for nginx (and haproxy, its similar):
|
tcp, for nginx (and haproxy, its similar):
|
||||||
@@ -36,7 +21,7 @@ struct ngx_connection_s {
|
|||||||
|
|
||||||
ngx_socket_t fd;
|
ngx_socket_t fd;
|
||||||
|
|
||||||
ngx_recv_pt recv; // fn pointer to whatever recv fn used (different for idfferent platforms / protocol
|
ngx_recv_pt recv; // fn pointer to whatever recv fn used (different for dfferent platforms / protocol
|
||||||
ngx_send_pt send; // ditto
|
ngx_send_pt send; // ditto
|
||||||
ngx_recv_chain_pt recv_chain;
|
ngx_recv_chain_pt recv_chain;
|
||||||
ngx_send_chain_pt send_chain;
|
ngx_send_chain_pt send_chain;
|
||||||
@@ -120,9 +105,11 @@ process to load balance:
|
|||||||
- proxy the data (copy_bidirectional? maybe we want some metrics or logging, so might do manually)
|
- proxy the data (copy_bidirectional? maybe we want some metrics or logging, so might do manually)
|
||||||
- cleanup when smoeone leavesr or something goes wrong (with TCP, OS / tokio will tell us, with UDP probably just timeout based, and a periodic sweep of all sessions)
|
- cleanup when smoeone leavesr or something goes wrong (with TCP, OS / tokio will tell us, with UDP probably just timeout based, and a periodic sweep of all sessions)
|
||||||
|
|
||||||
|
## Load balancer algorithm
|
||||||
### UDP
|
- Choose a fixed weight coefficient for the resource parameter
|
||||||
UDP is connectionless, and i don't think UdpSocket or UdpFramed implement the traits required for tokio copy_bidirectional
|
- Spawn a thread on a load balancer to host the iperf server, used for new onboarding server connecting to the load balancer to measure their maximum bandwidth
|
||||||
but async write and read don't work on just regular datagrams, so probably not possible.
|
- Spawn another thread for listening to resource update from connected server
|
||||||
|
- Update the comprehensive load sum from eq (1), update the formula in eq (2) to (5)
|
||||||
Would require us to implement our own bidirectional copying / proxying, as well as tracking "active" connections.
|
- Choose alpha for eq (8), and run the algorithm to choose which server
|
||||||
|
- Extract the server from the server id using ```get_backend()```
|
||||||
|
- Use ```tunnel()``` to proxy the packet
|
||||||
|
|||||||
34
config.yaml
34
config.yaml
@@ -1,34 +0,0 @@
|
|||||||
backends:
|
|
||||||
- id: "srv-1"
|
|
||||||
ip: "127.0.0.1"
|
|
||||||
port: 8081
|
|
||||||
|
|
||||||
- id: "srv-2"
|
|
||||||
ip: "127.0.0.1"
|
|
||||||
port: 8082
|
|
||||||
|
|
||||||
clusters:
|
|
||||||
main-api:
|
|
||||||
- "srv-1"
|
|
||||||
- "srv-2"
|
|
||||||
priority-api:
|
|
||||||
- "srv-1"
|
|
||||||
|
|
||||||
rules:
|
|
||||||
- clients:
|
|
||||||
- "0.0.0.0/0:8080"
|
|
||||||
targets:
|
|
||||||
- "main-api"
|
|
||||||
strategy:
|
|
||||||
type: "RoundRobin"
|
|
||||||
|
|
||||||
- clients:
|
|
||||||
- "0.0.0.0/0:6767"
|
|
||||||
targets: # no issues with duplicate servers or clusters
|
|
||||||
- "priority-api"
|
|
||||||
- "priority-api"
|
|
||||||
- "priority-api"
|
|
||||||
strategy:
|
|
||||||
type: "Adaptive"
|
|
||||||
coefficients: [ 1.5, 1.0, 0.5, 0.1 ]
|
|
||||||
alpha: 0.75
|
|
||||||
@@ -1,89 +0,0 @@
|
|||||||
services:
|
|
||||||
# two-arm load balancer
|
|
||||||
load-balancer:
|
|
||||||
image: neoslhp/enginewhy-lb
|
|
||||||
container_name: load-balancer
|
|
||||||
tty: true
|
|
||||||
deploy:
|
|
||||||
resources:
|
|
||||||
limits:
|
|
||||||
cpus: "4.0"
|
|
||||||
memory: 8G
|
|
||||||
cap_add:
|
|
||||||
- NET_ADMIN
|
|
||||||
- SYS_ADMIN
|
|
||||||
networks:
|
|
||||||
internal:
|
|
||||||
ipv4_address: 172.67.67.67
|
|
||||||
external:
|
|
||||||
ipv4_address: 192.67.67.67
|
|
||||||
|
|
||||||
|
|
||||||
server1-high-cpu:
|
|
||||||
image: neoslhp/enginewhy-server
|
|
||||||
container_name: server1
|
|
||||||
tty: true
|
|
||||||
deploy:
|
|
||||||
resources:
|
|
||||||
limits:
|
|
||||||
cpus: "4.0"
|
|
||||||
memory: 8G
|
|
||||||
depends_on:
|
|
||||||
- load-balancer
|
|
||||||
cap_add:
|
|
||||||
- NET_ADMIN
|
|
||||||
networks:
|
|
||||||
external:
|
|
||||||
ipv4_address: 192.67.67.2
|
|
||||||
|
|
||||||
server2-low-cpu:
|
|
||||||
image: neoslhp/enginewhy-server
|
|
||||||
container_name: server2
|
|
||||||
tty: true
|
|
||||||
deploy:
|
|
||||||
resources:
|
|
||||||
limits:
|
|
||||||
cpus: "2.0"
|
|
||||||
memory: 4G
|
|
||||||
depends_on:
|
|
||||||
- load-balancer
|
|
||||||
cap_add:
|
|
||||||
- NET_ADMIN
|
|
||||||
networks:
|
|
||||||
external:
|
|
||||||
ipv4_address: 192.67.67.3
|
|
||||||
|
|
||||||
client:
|
|
||||||
image: neoslhp/enginewhy-ubuntu22.04
|
|
||||||
container_name: client
|
|
||||||
tty: true
|
|
||||||
deploy:
|
|
||||||
resources:
|
|
||||||
limits:
|
|
||||||
cpus: "4.0"
|
|
||||||
memory: 4G
|
|
||||||
depends_on:
|
|
||||||
- load-balancer
|
|
||||||
cap_add:
|
|
||||||
- NET_ADMIN
|
|
||||||
networks:
|
|
||||||
internal:
|
|
||||||
ipv4_address: 172.67.67.2
|
|
||||||
|
|
||||||
networks:
|
|
||||||
internal:
|
|
||||||
driver: bridge
|
|
||||||
ipam:
|
|
||||||
config:
|
|
||||||
- subnet: 172.67.67.0/24
|
|
||||||
external:
|
|
||||||
driver: bridge
|
|
||||||
ipam:
|
|
||||||
config:
|
|
||||||
- subnet: 192.67.67.0/24
|
|
||||||
|
|
||||||
# Resources:
|
|
||||||
# https://networkgeekstuff.com/networking/basic-load-balancer-scenarios-explained/
|
|
||||||
# https://hub.docker.com/r/linuxserver/wireshark
|
|
||||||
# https://www.wcse.org/WCSE_2018/W110.pdf
|
|
||||||
# Deepseek
|
|
||||||
@@ -1 +0,0 @@
|
|||||||
|
|
||||||
@@ -1,93 +0,0 @@
|
|||||||
pub mod health;
|
|
||||||
|
|
||||||
use core::fmt;
|
|
||||||
use std::net::SocketAddr;
|
|
||||||
use std::sync::Arc;
|
|
||||||
use std::sync::RwLock;
|
|
||||||
use std::sync::atomic::{AtomicUsize, Ordering};
|
|
||||||
|
|
||||||
// Physical server health statistics, used for certain load balancing algorithms
|
|
||||||
#[derive(Debug, Default)]
|
|
||||||
pub struct ServerMetrics {
|
|
||||||
pub cpu: f64,
|
|
||||||
pub mem: f64,
|
|
||||||
pub net: f64,
|
|
||||||
pub io: f64,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl ServerMetrics {
|
|
||||||
pub fn update(&mut self, cpu: f64, mem: f64, net: f64, io: f64) {
|
|
||||||
self.cpu = cpu;
|
|
||||||
self.mem = mem;
|
|
||||||
self.net = net;
|
|
||||||
self.io = io;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// A possible endpoint for a proxied connection.
|
|
||||||
// Note that multiple may live on the same server, hence the Arc<RwLock<ServerMetric>>
|
|
||||||
#[derive(Debug)]
|
|
||||||
pub struct Backend {
|
|
||||||
pub id: String,
|
|
||||||
pub address: SocketAddr,
|
|
||||||
pub active_connections: AtomicUsize,
|
|
||||||
pub metrics: Arc<RwLock<ServerMetrics>>,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl Backend {
|
|
||||||
pub fn new(
|
|
||||||
id: String,
|
|
||||||
address: SocketAddr,
|
|
||||||
server_metrics: Arc<RwLock<ServerMetrics>>,
|
|
||||||
) -> Self {
|
|
||||||
Self {
|
|
||||||
id: id.to_string(),
|
|
||||||
address,
|
|
||||||
active_connections: AtomicUsize::new(0),
|
|
||||||
metrics: server_metrics,
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// Ordering::Relaxed means the ops could be in any order, but since this
|
|
||||||
// is just a metric, and we assume the underlying system is sane
|
|
||||||
// enough not to behave poorly, so SeqCst is probably overkill.
|
|
||||||
pub fn inc_connections(&self) {
|
|
||||||
self.active_connections.fetch_add(1, Ordering::Relaxed);
|
|
||||||
println!(
|
|
||||||
"{} has {} connections open",
|
|
||||||
self.id,
|
|
||||||
self.active_connections.load(Ordering::Relaxed)
|
|
||||||
);
|
|
||||||
}
|
|
||||||
|
|
||||||
pub fn dec_connections(&self) {
|
|
||||||
self.active_connections.fetch_sub(1, Ordering::Relaxed);
|
|
||||||
println!(
|
|
||||||
"{} has {} connections open",
|
|
||||||
self.id,
|
|
||||||
self.active_connections.load(Ordering::Relaxed)
|
|
||||||
);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
impl fmt::Display for Backend {
|
|
||||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
|
||||||
write!(f, "{} ({})", self.address, self.id)
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// A set of endpoints that can be load balanced around.
|
|
||||||
// Each Balancer owns one of these. Backend instances may be shared
|
|
||||||
// with other Balancer instances, hence Arc<Backend>.
|
|
||||||
#[derive(Clone, Debug)]
|
|
||||||
pub struct BackendPool {
|
|
||||||
pub backends: Arc<Vec<Arc<Backend>>>,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl BackendPool {
|
|
||||||
pub fn new(backends: Vec<Arc<Backend>>) -> Self {
|
|
||||||
BackendPool {
|
|
||||||
backends: Arc::new(backends),
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@@ -1,144 +1,211 @@
|
|||||||
use crate::backend::{Backend, BackendPool, ServerMetrics};
|
use crate::netutils::Backend;
|
||||||
use crate::balancer::{Balancer, ConnectionInfo};
|
|
||||||
use rand::prelude::*;
|
use rand::prelude::*;
|
||||||
use rand::rngs::SmallRng;
|
use rand::rngs::SmallRng;
|
||||||
use std::fmt::Debug;
|
use std::sync::Arc;
|
||||||
use std::fs::Metadata;
|
|
||||||
use std::sync::{Arc, RwLock};
|
|
||||||
|
|
||||||
#[derive(Debug)]
|
|
||||||
struct AdaptiveNode {
|
#[derive(Debug, Clone)]
|
||||||
backend: Arc<Backend>,
|
pub struct ServerMetrics {
|
||||||
weight: f64,
|
// metrics are percents (0..100)
|
||||||
|
pub cpu: f64,
|
||||||
|
pub mem: f64,
|
||||||
|
pub net: f64,
|
||||||
|
pub io: f64,
|
||||||
}
|
}
|
||||||
|
|
||||||
#[derive(Debug)]
|
impl ServerMetrics {
|
||||||
pub struct AdaptiveWeightBalancer {
|
pub fn new() -> Self {
|
||||||
pool: Vec<AdaptiveNode>,
|
ServerMetrics { cpu: 0.0, mem: 0.0, net: 0.0, io: 0.0 }
|
||||||
coefficients: [f64; 4],
|
}
|
||||||
|
|
||||||
|
pub fn update(&mut self, cpu: f64, mem: f64, net: f64, io: f64) {
|
||||||
|
self.cpu = cpu;
|
||||||
|
self.mem = mem;
|
||||||
|
self.net = net;
|
||||||
|
self.io = io;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[derive(Debug, Clone)]
|
||||||
|
pub struct ServerState {
|
||||||
|
pub backend: Backend,
|
||||||
|
pub metrics: ServerMetrics,
|
||||||
|
pub weight: f64,
|
||||||
|
}
|
||||||
|
|
||||||
|
impl ServerState {
|
||||||
|
pub fn new(backend: Backend) -> Self {
|
||||||
|
ServerState { backend, metrics: ServerMetrics::new(), weight: 1.0 }
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub struct AdaptiveBalancer {
|
||||||
|
servers: Vec<ServerState>,
|
||||||
|
// resource coefficients (cpu, mem, net, io) - sum to 1.0
|
||||||
|
coeffs: [f64; 4],
|
||||||
alpha: f64,
|
alpha: f64,
|
||||||
rng: SmallRng,
|
rng: SmallRng,
|
||||||
}
|
}
|
||||||
|
|
||||||
impl AdaptiveWeightBalancer {
|
impl AdaptiveBalancer {
|
||||||
pub fn new(pool: BackendPool, coefficients: [f64; 4], alpha: f64) -> Self {
|
pub fn new(backends: Vec<Backend>, coeffs: [f64; 4], alpha: f64) -> Self {
|
||||||
let nodes = pool
|
let servers = backends.into_iter().map(ServerState::new).collect();
|
||||||
.backends
|
let rng = SmallRng::from_entropy();
|
||||||
.iter()
|
AdaptiveBalancer { servers, coeffs, alpha, rng }
|
||||||
.map(|b| AdaptiveNode {
|
}
|
||||||
backend: b.clone(),
|
|
||||||
weight: 0f64,
|
|
||||||
})
|
|
||||||
.collect();
|
|
||||||
|
|
||||||
AdaptiveWeightBalancer {
|
pub fn add_backend(&mut self, backend: Backend) {
|
||||||
pool: nodes,
|
self.servers.push(ServerState::new(backend));
|
||||||
coefficients,
|
}
|
||||||
alpha,
|
|
||||||
rng: SmallRng::from_rng(&mut rand::rng()),
|
/// Update metrics reported by a backend identified by its display/address.
|
||||||
|
/// If the backend isn't found this is a no-op.
|
||||||
|
pub fn update_metrics(&mut self, backend_addr: &str, cpu: f64, mem: f64, net: f64, io: f64) {
|
||||||
|
for s in &mut self.servers {
|
||||||
|
if s.backend.to_string() == backend_addr {
|
||||||
|
s.metrics.update(cpu, mem, net, io);
|
||||||
|
return;
|
||||||
|
}
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
pub fn metrics_to_weight(&self, metrics: &ServerMetrics) -> f64 {
|
fn metrics_to_weight(metrics: &ServerMetrics, coeffs: &[f64; 4]) -> f64 {
|
||||||
self.coefficients[0] * metrics.cpu
|
coeffs[0] * metrics.cpu + coeffs[1] * metrics.mem + coeffs[2] * metrics.net + coeffs[3] * metrics.io
|
||||||
+ self.coefficients[1] * metrics.mem
|
|
||||||
+ self.coefficients[2] * metrics.net
|
|
||||||
+ self.coefficients[3] * metrics.io
|
|
||||||
}
|
}
|
||||||
}
|
|
||||||
|
|
||||||
impl Balancer for AdaptiveWeightBalancer {
|
/// Choose a backend using weighted random selection based on current weights.
|
||||||
fn choose_backend(&mut self, ctx: ConnectionInfo) -> Option<Arc<Backend>> {
|
/// Returns an Arc-wrapped Backend clone so callers can cheaply clone it.
|
||||||
if self.pool.is_empty() {
|
pub fn choose_backend(&mut self) -> Option<Arc<Backend>> {
|
||||||
|
if self.servers.is_empty() {
|
||||||
return None;
|
return None;
|
||||||
}
|
}
|
||||||
|
|
||||||
// Compute remaining capacity R_i = 100 - composite_load
|
// Compute remaining capacity R_i = 100 - composite_load
|
||||||
let mut r_sum = 0.0;
|
let rs: Vec<f64> = self.servers.iter().map(|s| {
|
||||||
let mut w_sum = 0.0;
|
Self::metrics_to_weight(&s.metrics, &self.coeffs)
|
||||||
let mut l_sum = 0;
|
}).collect();
|
||||||
|
let ws: Vec<f64> = self.servers.iter().map(|s| s.weight).collect();
|
||||||
|
let ls: Vec<u32> = self.servers.iter().map(|s| s.backend.current_load).collect();
|
||||||
|
|
||||||
for node in &self.pool {
|
let r_sum: f64 = rs.iter().copied().sum::<f64>();
|
||||||
if let Ok(health) = node.backend.metrics.read() {
|
let w_sum: f64 = ws.iter().copied().sum::<f64>().max(1e-12);
|
||||||
r_sum += self.metrics_to_weight(&health);
|
let l_sum: u32 = ls.iter().copied().sum::<u32>();
|
||||||
}
|
let threshold = self.alpha * (r_sum / w_sum);
|
||||||
w_sum += node.weight;
|
|
||||||
l_sum += node
|
|
||||||
.backend
|
|
||||||
.active_connections
|
|
||||||
.load(std::sync::atomic::Ordering::Relaxed);
|
|
||||||
}
|
|
||||||
|
|
||||||
let safe_w_sum = w_sum.max(1e-12);
|
|
||||||
let threshold = self.alpha * (r_sum / safe_w_sum);
|
|
||||||
|
|
||||||
for idx in 0..self.pool.len() {
|
|
||||||
let node = &self.pool[idx];
|
|
||||||
|
|
||||||
if node.weight <= 0.001 {
|
|
||||||
continue;
|
|
||||||
}
|
|
||||||
|
|
||||||
let risk = match node.backend.metrics.read() {
|
|
||||||
Ok(h) => self.metrics_to_weight(&h),
|
|
||||||
Err(_) => f64::MAX,
|
|
||||||
};
|
|
||||||
|
|
||||||
let ratio = risk / node.weight;
|
|
||||||
|
|
||||||
|
for (i, s) in self.servers.iter_mut().enumerate() {
|
||||||
|
let ratio = if s.weight <= 0.0 { f64::INFINITY } else { rs[i] / s.weight };
|
||||||
if ratio <= threshold {
|
if ratio <= threshold {
|
||||||
return Some(node.backend.clone());
|
return Some(Arc::new(s.backend.clone()));
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
// If any server satisfies Ri/Wi <= threshold, it means the server
|
// If any server satisfies Ri/Wi <= threshold, it means the server
|
||||||
// is relatively overloaded, and we must adjust its weight using
|
// is relatively overloaded and we must adjust its weight using
|
||||||
// formula (6).
|
// formula (6).
|
||||||
let mut total_lwi = 0.0;
|
|
||||||
let l_sum_f64 = l_sum as f64;
|
|
||||||
|
|
||||||
for node in &self.pool {
|
let lwi: Vec<f64> = self.servers.iter().enumerate().map(|(i, s)| {
|
||||||
let load = node
|
s.backend.current_load as f64 * w_sum / ws[i] * l_sum as f64
|
||||||
.backend
|
}).collect();
|
||||||
.active_connections
|
let a_lwi: f64 = lwi.iter().copied().sum::<f64>() / lwi.len() as f64;
|
||||||
.load(std::sync::atomic::Ordering::Relaxed) as f64;
|
for (i, s) in self.servers.iter_mut().enumerate() {
|
||||||
let weight = node.weight.max(1e-12);
|
s.weight += 1 as f64 - lwi[i] / a_lwi;
|
||||||
let lwi = load * (safe_w_sum / weight) * l_sum_f64;
|
|
||||||
total_lwi += lwi;
|
|
||||||
}
|
}
|
||||||
|
|
||||||
let avg_lwi = (total_lwi / self.pool.len() as f64).max(1e-12);
|
|
||||||
|
|
||||||
// Compute Li = Wi / Ri and choose server minimizing Li.
|
// Compute Li = Wi / Ri and choose server minimizing Li.
|
||||||
let mut best_backend: Option<Arc<Backend>> = None;
|
let mut best_idx: Option<usize> = None;
|
||||||
let mut min_load = usize::MAX;
|
let mut best_li = u32::MAX;
|
||||||
|
for (i, s) in self.servers.iter().enumerate() {
|
||||||
for node in &mut self.pool {
|
let li = s.backend.current_load;
|
||||||
let load = node
|
if li < best_li {
|
||||||
.backend
|
best_li = li;
|
||||||
.active_connections
|
best_idx = Some(i);
|
||||||
.load(std::sync::atomic::Ordering::Relaxed);
|
|
||||||
let load_f64 = load as f64;
|
|
||||||
let weight = node.weight.max(1e-12);
|
|
||||||
|
|
||||||
let lwi = load_f64 * (safe_w_sum / weight) * l_sum_f64;
|
|
||||||
|
|
||||||
let adj = 1.0 - (lwi / avg_lwi);
|
|
||||||
node.weight += adj;
|
|
||||||
|
|
||||||
node.weight = node.weight.clamp(0.1, 100.0);
|
|
||||||
if load < min_load {
|
|
||||||
min_load = load;
|
|
||||||
best_backend = Some(node.backend.clone());
|
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
match best_backend {
|
// If nothing chosen, fall back to random selection
|
||||||
Some(backend) => Some(backend),
|
if best_idx.is_none() {
|
||||||
None => {
|
let i = (self.rng.next_u32() as usize) % self.servers.len();
|
||||||
let i = (self.rng.next_u32() as usize) % self.pool.len();
|
return Some(Arc::new(self.servers[i].backend.clone()));
|
||||||
Some(self.pool[i].backend.clone())
|
|
||||||
}
|
}
|
||||||
|
|
||||||
|
Some(Arc::new(self.servers[best_idx.unwrap()].backend.clone()))
|
||||||
}
|
}
|
||||||
|
|
||||||
|
// Expose a snapshot of server weights (for monitoring/testing)
|
||||||
|
pub fn snapshot_weights(&self) -> Vec<(String, f64)> {
|
||||||
|
self.servers.iter().map(|s| (s.backend.to_string(), s.weight)).collect()
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
#[cfg(test)]
|
||||||
|
mod tests {
|
||||||
|
use super::*;
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn basic_weight_update_and_choose() {
|
||||||
|
let backends = vec![Backend::new("127.0.0.1:1".to_string()), Backend::new("127.0.0.1:2".to_string())];
|
||||||
|
let mut b = AdaptiveBalancer::new(backends, [0.5, 0.2, 0.2, 0.1], 0.5);
|
||||||
|
// initially equal weights
|
||||||
|
let snaps = b.snapshot_weights();
|
||||||
|
assert_eq!(snaps.len(), 2);
|
||||||
|
// update one backend to be heavily loaded
|
||||||
|
b.update_metrics("127.0.0.1:1", 90.0, 80.0, 10.0, 5.0);
|
||||||
|
b.update_metrics("127.0.0.1:2", 10.0, 5.0, 1.0, 1.0);
|
||||||
|
|
||||||
|
// Choose backend: should pick the less loaded host (127.0.0.1:2)
|
||||||
|
let chosen = b.choose_backend().expect("should choose a backend");
|
||||||
|
let snaps2 = b.snapshot_weights();
|
||||||
|
println!("{:?}, {:?}", snaps, snaps2);
|
||||||
|
assert_eq!(chosen.to_string(), "127.0.0.1:2");
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn choose_none_when_empty() {
|
||||||
|
let mut b = AdaptiveBalancer::new(vec![], [0.5, 0.2, 0.2, 0.1], 0.5);
|
||||||
|
assert!(b.choose_backend().is_none());
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn ratio_triggers_immediate_selection() {
|
||||||
|
// Arrange two servers where server 1 has composite load 0 and server 2 has composite load 100.
|
||||||
|
// With alpha = 1.0 and two servers, threshold = 1.0 * (r_sum / w_sum) = 1.0 * (100 / 2) = 50.
|
||||||
|
// Server 1 ratio = 0 / 1 = 0 <= 50 so it should be chosen immediately.
|
||||||
|
let backends = vec![Backend::new("127.0.0.1:1".to_string()), Backend::new("127.0.0.1:2".to_string())];
|
||||||
|
let mut b = AdaptiveBalancer::new(backends, [0.25, 0.25, 0.25, 0.25], 1.0);
|
||||||
|
|
||||||
|
b.update_metrics("127.0.0.1:1", 0.0, 0.0, 0.0, 0.0);
|
||||||
|
b.update_metrics("127.0.0.1:2", 100.0, 100.0, 100.0, 100.0);
|
||||||
|
|
||||||
|
let chosen = b.choose_backend().expect("should choose a backend");
|
||||||
|
assert_eq!(chosen.to_string(), "127.0.0.1:1");
|
||||||
|
}
|
||||||
|
|
||||||
|
#[test]
|
||||||
|
fn choose_min_current_load_when_no_ratio() {
|
||||||
|
// Arrange three servers with identical composite loads so no server satisfies Ri/Wi <= threshold
|
||||||
|
// (set alpha < 1 so threshold < ratio). The implementation then falls back to picking the
|
||||||
|
// server with minimum current_load
|
||||||
|
let mut s1 = Backend::new("127.0.0.1:1".to_string());
|
||||||
|
let mut s2 = Backend::new("127.0.0.1:2".to_string());
|
||||||
|
let mut s3 = Backend::new("127.0.0.1:3".to_string());
|
||||||
|
|
||||||
|
// set current_loads (field expected to be public)
|
||||||
|
s1.current_load = 10;
|
||||||
|
s2.current_load = 5;
|
||||||
|
s3.current_load = 20;
|
||||||
|
|
||||||
|
// Use coeffs that only consider CPU so composite load is easy to reason about.
|
||||||
|
let mut bal = AdaptiveBalancer::new(vec![s1, s2, s3], [1.0, 0.0, 0.0, 0.0], 0.5);
|
||||||
|
|
||||||
|
// set identical composite loads > 0 for all so ratio = x and threshold = alpha * x < x
|
||||||
|
// you will have threshold = 25 for all 3 backend servers and ratio = 50
|
||||||
|
// so that forces to choose the smallest current load backend
|
||||||
|
bal.update_metrics("127.0.0.1:1", 50.0, 0.0, 0.0, 0.0);
|
||||||
|
bal.update_metrics("127.0.0.1:2", 50.0, 0.0, 0.0, 0.0);
|
||||||
|
bal.update_metrics("127.0.0.1:3", 50.0, 0.0, 0.0, 0.0);
|
||||||
|
|
||||||
|
let chosen = bal.choose_backend().expect("should choose a backend");
|
||||||
|
// expect server with smallest current_load (127.0.0.1:2)
|
||||||
|
assert_eq!(chosen.to_string(), "127.0.0.1:2");
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|||||||
@@ -1,108 +0,0 @@
|
|||||||
use crate::backend::{Backend, BackendPool};
|
|
||||||
use crate::balancer::{Balancer, ConnectionInfo};
|
|
||||||
use std::hash::{DefaultHasher, Hash, Hasher};
|
|
||||||
use std::sync::{Arc, RwLock};
|
|
||||||
|
|
||||||
#[derive(Debug)]
|
|
||||||
pub struct SourceIPHash {
|
|
||||||
pool: BackendPool,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl SourceIPHash {
|
|
||||||
pub fn new(pool: BackendPool) -> SourceIPHash {
|
|
||||||
Self { pool }
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
impl Balancer for SourceIPHash {
|
|
||||||
fn choose_backend(&mut self, ctx: ConnectionInfo) -> Option<Arc<Backend>> {
|
|
||||||
let client_ip = ctx.client_ip;
|
|
||||||
|
|
||||||
let mut hasher = DefaultHasher::new();
|
|
||||||
client_ip.hash(&mut hasher);
|
|
||||||
let hash = hasher.finish();
|
|
||||||
let idx = (hash as usize) % self.pool.backends.len();
|
|
||||||
|
|
||||||
Some(self.pool.backends[idx].clone())
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
#[cfg(test)]
|
|
||||||
mod tests {
|
|
||||||
use super::*;
|
|
||||||
use std::net::IpAddr;
|
|
||||||
use crate::backend::ServerMetrics;
|
|
||||||
|
|
||||||
fn create_dummy_backends(count: usize) -> BackendPool {
|
|
||||||
let mut backends = Vec::new();
|
|
||||||
for i in 1..=count {
|
|
||||||
backends.push(Arc::new(Backend::new(
|
|
||||||
format!("backend {}", i),
|
|
||||||
format!("127.0.0.1:808{}", i).parse().unwrap(),
|
|
||||||
Arc::new(RwLock::new(ServerMetrics::default())),
|
|
||||||
)));
|
|
||||||
}
|
|
||||||
BackendPool::new(backends)
|
|
||||||
}
|
|
||||||
|
|
||||||
#[test]
|
|
||||||
fn test_same_ip_always_selects_same_backend() {
|
|
||||||
let backends = create_dummy_backends(3);
|
|
||||||
let mut balancer = SourceIPHash::new(backends);
|
|
||||||
|
|
||||||
let client_ip: IpAddr = "192.168.1.100".parse().unwrap();
|
|
||||||
|
|
||||||
let first_choice = balancer.choose_backend(ConnectionInfo { client_ip });
|
|
||||||
let second_choice = balancer.choose_backend(ConnectionInfo { client_ip });
|
|
||||||
|
|
||||||
assert!(first_choice.is_some());
|
|
||||||
assert!(second_choice.is_some());
|
|
||||||
|
|
||||||
let first = first_choice.unwrap();
|
|
||||||
let second = second_choice.unwrap();
|
|
||||||
|
|
||||||
assert_eq!(first.id, second.id);
|
|
||||||
}
|
|
||||||
|
|
||||||
#[test]
|
|
||||||
fn test_different_ips_may_select_different_backends() {
|
|
||||||
let backends = create_dummy_backends(2);
|
|
||||||
let mut balancer = SourceIPHash::new(backends);
|
|
||||||
|
|
||||||
let ip1: IpAddr = "192.168.1.100".parse().unwrap();
|
|
||||||
let choice1 = balancer.choose_backend(ConnectionInfo { client_ip: ip1 });
|
|
||||||
|
|
||||||
let ip2: IpAddr = "192.168.1.101".parse().unwrap();
|
|
||||||
let choice2 = balancer.choose_backend(ConnectionInfo { client_ip: ip2 });
|
|
||||||
|
|
||||||
assert!(choice1.is_some());
|
|
||||||
assert!(choice2.is_some());
|
|
||||||
}
|
|
||||||
|
|
||||||
#[test]
|
|
||||||
fn test_hash_distribution_across_backends() {
|
|
||||||
let pool = create_dummy_backends(3);
|
|
||||||
let backends_ref = pool.backends.clone();
|
|
||||||
|
|
||||||
let mut balancer = SourceIPHash::new(pool);
|
|
||||||
let mut distribution = [0, 0, 0];
|
|
||||||
|
|
||||||
// Test 30 different IPs
|
|
||||||
for i in 0..30 {
|
|
||||||
let client_ip: IpAddr = format!("192.168.1.{}", 100 + i).parse().unwrap();
|
|
||||||
|
|
||||||
if let Some(backend) = balancer.choose_backend(ConnectionInfo { client_ip }) {
|
|
||||||
for (idx, b) in backends_ref.iter().enumerate() {
|
|
||||||
if backend.id == b.id && backend.address == b.address {
|
|
||||||
distribution[idx] += 1;
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
assert!(distribution[0] > 0, "Backend 0 received no traffic");
|
|
||||||
assert!(distribution[1] > 0, "Backend 1 received no traffic");
|
|
||||||
assert!(distribution[2] > 0, "Backend 2 received no traffic");
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@@ -1 +0,0 @@
|
|||||||
use super::*;
|
|
||||||
@@ -1,18 +1,2 @@
|
|||||||
pub mod adaptive_weight;
|
pub mod adaptive_weight;
|
||||||
pub mod ip_hashing;
|
pub use adaptive_weight::AdaptiveBalancer;
|
||||||
pub mod least_connections;
|
|
||||||
pub mod round_robin;
|
|
||||||
|
|
||||||
use crate::backend::Backend;
|
|
||||||
use std::fmt::Debug;
|
|
||||||
use std::net::IpAddr;
|
|
||||||
use std::sync::Arc;
|
|
||||||
|
|
||||||
#[derive(Clone, Debug)]
|
|
||||||
pub struct ConnectionInfo {
|
|
||||||
pub client_ip: IpAddr,
|
|
||||||
}
|
|
||||||
|
|
||||||
pub trait Balancer: Debug + Send + Sync + 'static {
|
|
||||||
fn choose_backend(&mut self, ctx: ConnectionInfo) -> Option<Arc<Backend>>;
|
|
||||||
}
|
|
||||||
|
|||||||
0
src/balancer/random.rs
Normal file
0
src/balancer/random.rs
Normal file
@@ -1,32 +0,0 @@
|
|||||||
use crate::backend::{Backend, BackendPool};
|
|
||||||
use crate::balancer::{Balancer, ConnectionInfo};
|
|
||||||
use std::fmt::Debug;
|
|
||||||
use std::sync::{Arc, RwLock};
|
|
||||||
|
|
||||||
// only the main thread for receiving connections should be
|
|
||||||
// doing the load balancing. alternatively, each thread
|
|
||||||
// that handles load balancing should get their own instance.
|
|
||||||
#[derive(Debug)]
|
|
||||||
pub struct RoundRobinBalancer {
|
|
||||||
pool: BackendPool,
|
|
||||||
index: usize,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl RoundRobinBalancer {
|
|
||||||
pub fn new(pool: BackendPool) -> RoundRobinBalancer {
|
|
||||||
Self { pool, index: 0 }
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
impl Balancer for RoundRobinBalancer {
|
|
||||||
fn choose_backend(&mut self, ctx: ConnectionInfo) -> Option<Arc<Backend>> {
|
|
||||||
let backends = self.pool.backends.clone();
|
|
||||||
if backends.is_empty() {
|
|
||||||
return None;
|
|
||||||
}
|
|
||||||
|
|
||||||
let backend = backends[self.index % backends.len()].clone();
|
|
||||||
self.index = self.index.wrapping_add(1);
|
|
||||||
Some(backend)
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@@ -1,125 +0,0 @@
|
|||||||
use cidr::IpCidr;
|
|
||||||
use std::collections::HashMap;
|
|
||||||
use std::net::{IpAddr, SocketAddr};
|
|
||||||
use std::sync::{Arc, RwLock};
|
|
||||||
|
|
||||||
use crate::backend::*;
|
|
||||||
use crate::balancer::Balancer;
|
|
||||||
use crate::balancer::adaptive_weight::AdaptiveWeightBalancer;
|
|
||||||
use crate::balancer::round_robin::RoundRobinBalancer;
|
|
||||||
use crate::config::*;
|
|
||||||
|
|
||||||
pub struct RoutingTable {
|
|
||||||
pub balancers: Vec<Box<dyn Balancer + Send>>,
|
|
||||||
pub entries: Vec<(IpCidr, usize)>,
|
|
||||||
}
|
|
||||||
|
|
||||||
pub type PortListeners = HashMap<u16, RoutingTable>;
|
|
||||||
|
|
||||||
fn parse_client(s: &str) -> Result<(IpCidr, u16), String> {
|
|
||||||
// just splits "0.0.0.0/0:80" into ("0.0.0.0/0", 80)
|
|
||||||
let (ip_part, port_part) = s.rsplit_once(':')
|
|
||||||
.ok_or_else(|| format!("badly formatted client: {}", s))?;
|
|
||||||
|
|
||||||
let port = port_part.parse()
|
|
||||||
.map_err(|_| format!("bad port: {}", s))?;
|
|
||||||
let cidr = ip_part.parse()
|
|
||||||
.map_err(|_| format!("bad ip/mask: {}", s))?;
|
|
||||||
|
|
||||||
Ok((cidr, port))
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
pub fn build_lb(config: AppConfig) -> Result<(PortListeners, HashMap<IpAddr, Arc<RwLock<ServerMetrics>>>), String> {
|
|
||||||
let mut healths: HashMap<IpAddr, Arc<RwLock<ServerMetrics>>> = HashMap::new();
|
|
||||||
let mut backends: HashMap<String, Arc<Backend>> = HashMap::new();
|
|
||||||
|
|
||||||
for backend_cfg in config.backends {
|
|
||||||
let ip: IpAddr = backend_cfg.ip.parse()
|
|
||||||
.map_err(|_| format!("bad ip: {}", backend_cfg.ip))?;
|
|
||||||
let addr = SocketAddr::new(ip, backend_cfg.port);
|
|
||||||
|
|
||||||
let health = healths
|
|
||||||
.entry(ip)
|
|
||||||
.or_insert_with(|| Arc::new(RwLock::new(ServerMetrics::default())))
|
|
||||||
.clone();
|
|
||||||
|
|
||||||
let backend = Arc::new(Backend::new(backend_cfg.id.clone(), addr, health));
|
|
||||||
|
|
||||||
backends.insert(backend_cfg.id, backend);
|
|
||||||
}
|
|
||||||
|
|
||||||
let mut listeners: PortListeners = HashMap::new();
|
|
||||||
|
|
||||||
for rule in config.rules {
|
|
||||||
let mut target_backends = Vec::new();
|
|
||||||
|
|
||||||
for target_name in &rule.targets {
|
|
||||||
if let Some(members) = config.clusters.get(target_name) {
|
|
||||||
for member_id in members {
|
|
||||||
if let Some(backend) = backends.get(member_id) {
|
|
||||||
target_backends.push(backend.clone());
|
|
||||||
}
|
|
||||||
}
|
|
||||||
} else if let Some(backend) = backends.get(target_name) {
|
|
||||||
target_backends.push(backend.clone());
|
|
||||||
} else {
|
|
||||||
eprintln!("warning: target {} not found", target_name);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// possible for multiple targets of the same rule to have common backends.
|
|
||||||
target_backends.sort_by(|a, b| a.id.cmp(&b.id));
|
|
||||||
target_backends.dedup_by(|a, b| a.id == b.id);
|
|
||||||
|
|
||||||
if target_backends.is_empty() {
|
|
||||||
eprintln!("warning: rule has no valid targets, skipping.");
|
|
||||||
continue;
|
|
||||||
}
|
|
||||||
|
|
||||||
// for each different client port on this rule, we unfortunately need to make a new
|
|
||||||
// Balancer, since Balancer is not thread safe, requires &mut self for the backend
|
|
||||||
// selection.
|
|
||||||
// a good enough compromise to make a new one for each port, avoids using Mutex, at the
|
|
||||||
// cost of minor penalty to load balancing "quality" when you have several client ports.
|
|
||||||
let mut port_groups: HashMap<u16, Vec<IpCidr>> = HashMap::new();
|
|
||||||
|
|
||||||
for client_def in rule.clients {
|
|
||||||
let (cidr, port) = parse_client(&client_def)?;
|
|
||||||
port_groups.entry(port).or_default().push(cidr);
|
|
||||||
}
|
|
||||||
|
|
||||||
for (port, cidrs) in port_groups {
|
|
||||||
let table = listeners.entry(port).or_insert_with(|| RoutingTable {
|
|
||||||
balancers: Vec::new(),
|
|
||||||
entries: Vec::new(),
|
|
||||||
});
|
|
||||||
|
|
||||||
let pool = BackendPool::new(target_backends.clone());
|
|
||||||
|
|
||||||
let balancer: Box<dyn Balancer + Send> = match &rule.strategy {
|
|
||||||
LoadBalancerStrategy::RoundRobin => Box::new(RoundRobinBalancer::new(pool)),
|
|
||||||
LoadBalancerStrategy::Adaptive {
|
|
||||||
coefficients,
|
|
||||||
alpha,
|
|
||||||
} => Box::new(AdaptiveWeightBalancer::new(pool, *coefficients, *alpha)),
|
|
||||||
};
|
|
||||||
|
|
||||||
let balancer_idx = table.balancers.len();
|
|
||||||
table.balancers.push(balancer);
|
|
||||||
|
|
||||||
for cidr in cidrs {
|
|
||||||
table.entries.push((cidr, balancer_idx));
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// sort to make most specific first, so that first match == longest prefix match
|
|
||||||
for table in listeners.values_mut() {
|
|
||||||
table
|
|
||||||
.entries
|
|
||||||
.sort_by(|(a, _), (b, _)| a.network_length().cmp(&b.network_length()));
|
|
||||||
}
|
|
||||||
|
|
||||||
Ok((listeners, healths))
|
|
||||||
}
|
|
||||||
@@ -1,46 +0,0 @@
|
|||||||
// config is written as a YAML file, the path will be passed to the program.
|
|
||||||
//
|
|
||||||
// the high level structure of the config is that we
|
|
||||||
// first define the individual backends (ip + port) we are going
|
|
||||||
// to load balance around.
|
|
||||||
//
|
|
||||||
// next we define some clusters, which are really more like a short
|
|
||||||
// alias for a group of backends.
|
|
||||||
//
|
|
||||||
// next we define the rules. these are written as a list of
|
|
||||||
// "ip/subnet:port" for the clients, and then a list of clusters
|
|
||||||
// for which backends these are balanced around. and of course
|
|
||||||
// specify which algorithm to use.
|
|
||||||
pub mod loader;
|
|
||||||
|
|
||||||
use serde::Deserialize;
|
|
||||||
use std::collections::HashMap;
|
|
||||||
|
|
||||||
#[derive(Debug, Deserialize)]
|
|
||||||
pub struct AppConfig {
|
|
||||||
pub backends: Vec<BackendConfig>,
|
|
||||||
#[serde(default)]
|
|
||||||
pub clusters: HashMap<String, Vec<String>>,
|
|
||||||
pub rules: Vec<RuleConfig>,
|
|
||||||
}
|
|
||||||
|
|
||||||
#[derive(Debug, Deserialize)]
|
|
||||||
pub struct BackendConfig {
|
|
||||||
pub id: String,
|
|
||||||
pub ip: String,
|
|
||||||
pub port: u16,
|
|
||||||
}
|
|
||||||
|
|
||||||
#[derive(Debug, Deserialize)]
|
|
||||||
pub struct RuleConfig {
|
|
||||||
pub clients: Vec<String>,
|
|
||||||
pub targets: Vec<String>,
|
|
||||||
pub strategy: LoadBalancerStrategy,
|
|
||||||
}
|
|
||||||
|
|
||||||
#[derive(Debug, Deserialize)]
|
|
||||||
#[serde(tag = "type")]
|
|
||||||
pub enum LoadBalancerStrategy {
|
|
||||||
RoundRobin,
|
|
||||||
Adaptive { coefficients: [f64; 4], alpha: f64 },
|
|
||||||
}
|
|
||||||
214
src/main.rs
214
src/main.rs
@@ -1,192 +1,56 @@
|
|||||||
mod backend;
|
macro_rules! info {
|
||||||
|
($($arg:tt)*) => {{
|
||||||
|
print!("info: ");
|
||||||
|
println!($($arg)*);
|
||||||
|
}};
|
||||||
|
}
|
||||||
|
|
||||||
|
macro_rules! error {
|
||||||
|
($($arg:tt)*) => {
|
||||||
|
eprint!("error: ");
|
||||||
|
eprintln!($($arg)*);
|
||||||
|
};
|
||||||
|
}
|
||||||
|
|
||||||
|
mod netutils;
|
||||||
mod balancer;
|
mod balancer;
|
||||||
mod config;
|
|
||||||
mod proxy;
|
|
||||||
|
|
||||||
use std::collections::HashMap;
|
|
||||||
use crate::balancer::{ConnectionInfo};
|
|
||||||
use crate::proxy::tcp::proxy_tcp_connection;
|
|
||||||
use std::fs::File;
|
|
||||||
use std::path::PathBuf;
|
|
||||||
use std::net::IpAddr;
|
|
||||||
use std::sync::atomic::{AtomicU64, Ordering};
|
|
||||||
use std::sync::{Arc, Mutex, RwLock};
|
|
||||||
use std::time::Duration;
|
|
||||||
use anywho::Error;
|
use anywho::Error;
|
||||||
|
use netutils::{Backend, tunnel};
|
||||||
|
use std::sync::Arc;
|
||||||
|
|
||||||
use tokio::net::TcpListener;
|
use tokio::net::TcpListener;
|
||||||
use tokio::sync::mpsc;
|
use tokio::sync::Mutex;
|
||||||
use crate::backend::ServerMetrics;
|
|
||||||
use crate::config::loader::{build_lb, RoutingTable};
|
|
||||||
|
|
||||||
use notify::{Watcher, RecursiveMode, Event};
|
|
||||||
use clap::Parser;
|
|
||||||
|
|
||||||
static NEXT_CONN_ID: AtomicU64 = AtomicU64::new(1);
|
|
||||||
|
|
||||||
struct ProgramState {
|
|
||||||
tx_rt_map: HashMap<u16, mpsc::UnboundedSender<RoutingTable>>,
|
|
||||||
healths: HashMap<IpAddr, Arc<RwLock<ServerMetrics>>>,
|
|
||||||
}
|
|
||||||
|
|
||||||
#[derive(Parser, Debug)]
|
|
||||||
#[command(author, version, about, long_about = None)]
|
|
||||||
struct Args {
|
|
||||||
#[arg(short, long, default_value = "config.yaml")]
|
|
||||||
config: PathBuf,
|
|
||||||
}
|
|
||||||
|
|
||||||
#[tokio::main]
|
#[tokio::main]
|
||||||
async fn main() -> Result<(), Box<dyn std::error::Error>> {
|
async fn main() -> Result<(), Error> {
|
||||||
let args = Args::parse();
|
let backends = Arc::new(vec![
|
||||||
|
Backend::new("127.0.0.1:8081".to_string()),
|
||||||
|
Backend::new("127.0.0.1:8082".to_string()),
|
||||||
|
]);
|
||||||
|
|
||||||
if !args.config.is_file() {
|
let current_index = Arc::new(Mutex::new(0));
|
||||||
eprintln!("config file not found or not accessible");
|
|
||||||
std::process::exit(1);
|
|
||||||
}
|
|
||||||
|
|
||||||
println!("reading config from {:?}", args.config);
|
info!("enginewhy starting on 0.0.0.0:8080");
|
||||||
|
info!("backends: {:?}", backends);
|
||||||
|
|
||||||
let state = Arc::new(Mutex::new(ProgramState {
|
let listener = TcpListener::bind("0.0.0.0:8080").await?;
|
||||||
tx_rt_map: HashMap::new(),
|
|
||||||
healths: HashMap::new(),
|
|
||||||
}));
|
|
||||||
|
|
||||||
if let Err(e) = load_config(&args.config, state.clone()).await {
|
|
||||||
eprintln!("config file loading failed: {}", e);
|
|
||||||
}
|
|
||||||
|
|
||||||
let config_path = args.config.clone();
|
|
||||||
let state_clone = state.clone();
|
|
||||||
tokio::spawn(async move {
|
|
||||||
let (tx, mut rx) = mpsc::channel(1);
|
|
||||||
|
|
||||||
let mut watcher = notify::recommended_watcher(move |res: Result<Event, notify::Error>| {
|
|
||||||
if let Ok(event) = res {
|
|
||||||
if event.kind.is_modify() {
|
|
||||||
let _ = tx.blocking_send(());
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}).unwrap();
|
|
||||||
|
|
||||||
watcher.watch(&config_path, RecursiveMode::NonRecursive).unwrap();
|
|
||||||
println!("watching for changes to {:?}", config_path);
|
|
||||||
|
|
||||||
while rx.recv().await.is_some() {
|
|
||||||
if let Err(e) = load_config(&config_path, state_clone.clone()).await {
|
|
||||||
eprintln!("loading config failed: {}", e);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
});
|
|
||||||
|
|
||||||
loop { tokio::time::sleep(Duration::from_hours(1)).await; }
|
|
||||||
}
|
|
||||||
|
|
||||||
async fn load_config(path: &PathBuf, state: Arc<Mutex<ProgramState>>) -> Result<(), Error> {
|
|
||||||
let f = File::open(path)?;
|
|
||||||
let app_config: config::AppConfig = match serde_saphyr::from_reader(f) {
|
|
||||||
Ok(app_config) => app_config,
|
|
||||||
Err(e) => { eprintln!("error parsing config {}", e); return Ok(()); }
|
|
||||||
};
|
|
||||||
|
|
||||||
println!(
|
|
||||||
"Loaded config, with {} backends, {} rules.",
|
|
||||||
app_config.backends.len(),
|
|
||||||
app_config.rules.len()
|
|
||||||
);
|
|
||||||
|
|
||||||
let (mut listeners, health_monitors) = match build_lb(app_config) {
|
|
||||||
Ok(v) => v,
|
|
||||||
Err(e) => {
|
|
||||||
eprintln!("config has logical errors: {}", e);
|
|
||||||
return Ok(());
|
|
||||||
}
|
|
||||||
};
|
|
||||||
let mut prog_state = state.lock().unwrap();
|
|
||||||
|
|
||||||
let ports_to_remove: Vec<u16> = prog_state.tx_rt_map
|
|
||||||
.keys()
|
|
||||||
.cloned()
|
|
||||||
.filter(|port| !listeners.contains_key(port))
|
|
||||||
.collect();
|
|
||||||
|
|
||||||
for port in ports_to_remove {
|
|
||||||
prog_state.tx_rt_map.remove(&port);
|
|
||||||
}
|
|
||||||
|
|
||||||
prog_state.healths = health_monitors;
|
|
||||||
for (port, routing_table) in listeners.drain() {
|
|
||||||
if let Some(x) = prog_state.tx_rt_map.get_mut(&port) {
|
|
||||||
x.send(routing_table)?;
|
|
||||||
println!("updated rules on port {}", port);
|
|
||||||
} else {
|
|
||||||
let (tx_rt, rx_rt) = mpsc::unbounded_channel();
|
|
||||||
prog_state.tx_rt_map.insert(port, tx_rt);
|
|
||||||
|
|
||||||
tokio::spawn(run_listener(port, rx_rt, routing_table));
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
println!("reload complete");
|
|
||||||
Ok(())
|
|
||||||
}
|
|
||||||
|
|
||||||
async fn run_listener(
|
|
||||||
port: u16,
|
|
||||||
mut rx_rt: mpsc::UnboundedReceiver<RoutingTable>,
|
|
||||||
mut current_table: RoutingTable
|
|
||||||
) {
|
|
||||||
let addr = format!("0.0.0.0:{}", port);
|
|
||||||
println!("Starting tcp listener on {}", addr);
|
|
||||||
|
|
||||||
let listener = TcpListener::bind(&addr).await.expect("Failed to bind port");
|
|
||||||
|
|
||||||
loop {
|
loop {
|
||||||
tokio::select! {
|
let (client, addr) = listener.accept().await?;
|
||||||
msg = rx_rt.recv() => {
|
info!("new connection from {}", addr);
|
||||||
match msg {
|
|
||||||
Some(new_table) => {
|
|
||||||
current_table = new_table;
|
|
||||||
}
|
|
||||||
None => {
|
|
||||||
println!("Unbinding listener on port {}", port);
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
accept_result = listener.accept() => {
|
|
||||||
match accept_result {
|
|
||||||
Ok((socket, remote_addr)) => {
|
|
||||||
let remote_ip = remote_addr.ip();
|
|
||||||
let conn_id = NEXT_CONN_ID.fetch_add(1, Ordering::Relaxed);
|
|
||||||
|
|
||||||
let mut chosen_backend = None;
|
let backend = {
|
||||||
|
let mut index = current_index.lock().await;
|
||||||
|
let selected_backend = backends[*index].clone();
|
||||||
|
*index = (*index + 1) % backends.len();
|
||||||
|
selected_backend
|
||||||
|
};
|
||||||
|
|
||||||
for (cidr, balancer_idx) in &mut current_table.entries {
|
info!("routing client {} to backend {}", addr, backend);
|
||||||
if cidr.contains(&remote_ip) {
|
|
||||||
let balancer = &mut current_table.balancers[*balancer_idx];
|
|
||||||
chosen_backend = balancer.choose_backend(ConnectionInfo {
|
|
||||||
client_ip: remote_ip,
|
|
||||||
});
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
if let Some(backend) = chosen_backend {
|
if let Err(e) = tunnel(client, backend).await {
|
||||||
tokio::spawn(async move {
|
error!("proxy failed for {}: {}", addr, e);
|
||||||
if let Err(e) = proxy_tcp_connection(conn_id, socket, backend).await {
|
|
||||||
eprintln!("error: conn_id={} proxy failed: {}", conn_id, e);
|
|
||||||
}
|
|
||||||
});
|
|
||||||
} else {
|
|
||||||
println!("error: no matching rule for {} on port {}", remote_ip, port);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
Err(e) => {
|
|
||||||
eprintln!("error: listener port {}: {}", port, e);
|
|
||||||
continue;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|||||||
56
src/netutils.rs
Normal file
56
src/netutils.rs
Normal file
@@ -0,0 +1,56 @@
|
|||||||
|
use std::fmt;
|
||||||
|
use tokio::io;
|
||||||
|
use tokio::net::TcpStream;
|
||||||
|
|
||||||
|
use std::error::Error;
|
||||||
|
|
||||||
|
#[derive(Clone, Debug)]
|
||||||
|
pub struct Backend {
|
||||||
|
address: String,
|
||||||
|
pub current_load : u32
|
||||||
|
}
|
||||||
|
|
||||||
|
impl Backend {
|
||||||
|
pub fn new(address: String) -> Self {
|
||||||
|
Backend {
|
||||||
|
address,
|
||||||
|
current_load : 0
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
impl fmt::Display for Backend {
|
||||||
|
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||||
|
write!(f, "{}", self.address)
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
pub async fn tunnel(client_stream: TcpStream, backend: Backend) -> Result<(), Box<dyn Error>> {
|
||||||
|
let backend_address: String = backend.address.clone();
|
||||||
|
|
||||||
|
tokio::spawn(async move {
|
||||||
|
let backend_stream: TcpStream = match TcpStream::connect(&backend_address).await {
|
||||||
|
Ok(s) => {
|
||||||
|
info!("connected to backend {backend_address}");
|
||||||
|
s
|
||||||
|
}
|
||||||
|
Err(e) => {
|
||||||
|
error!("failed connecting to backend {backend_address}: {e}");
|
||||||
|
return;
|
||||||
|
}
|
||||||
|
};
|
||||||
|
|
||||||
|
let (mut read_client, mut write_client) = client_stream.into_split();
|
||||||
|
let (mut read_backend, mut write_backend) = backend_stream.into_split();
|
||||||
|
|
||||||
|
let client_to_backend =
|
||||||
|
tokio::spawn(async move { io::copy(&mut read_client, &mut write_backend).await });
|
||||||
|
|
||||||
|
let backend_to_client =
|
||||||
|
tokio::spawn(async move { io::copy(&mut read_backend, &mut write_client).await });
|
||||||
|
|
||||||
|
let _ = tokio::join!(client_to_backend, backend_to_client);
|
||||||
|
});
|
||||||
|
|
||||||
|
Ok(())
|
||||||
|
}
|
||||||
@@ -1,44 +0,0 @@
|
|||||||
use crate::backend::Backend;
|
|
||||||
use std::net::SocketAddr;
|
|
||||||
use std::sync::Arc;
|
|
||||||
use std::time::Instant;
|
|
||||||
|
|
||||||
pub mod tcp;
|
|
||||||
|
|
||||||
pub struct ConnectionContext {
|
|
||||||
pub id: u64,
|
|
||||||
pub client_addr: SocketAddr,
|
|
||||||
pub start_time: Instant,
|
|
||||||
pub backend: Arc<Backend>,
|
|
||||||
pub bytes_transferred: u64,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl ConnectionContext {
|
|
||||||
pub fn new(id: u64, client_addr: SocketAddr, backend: Arc<Backend>) -> Self {
|
|
||||||
backend.inc_connections();
|
|
||||||
|
|
||||||
Self {
|
|
||||||
id,
|
|
||||||
client_addr,
|
|
||||||
start_time: Instant::now(),
|
|
||||||
backend,
|
|
||||||
bytes_transferred: 0,
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
impl Drop for ConnectionContext {
|
|
||||||
fn drop(&mut self) {
|
|
||||||
self.backend.dec_connections();
|
|
||||||
let duration = self.start_time.elapsed();
|
|
||||||
|
|
||||||
println!(
|
|
||||||
"info: conn_id={} closed. client={} backend={} bytes={} duration={:.2?}",
|
|
||||||
self.id,
|
|
||||||
self.client_addr,
|
|
||||||
self.backend.address,
|
|
||||||
self.bytes_transferred,
|
|
||||||
duration.as_secs_f64()
|
|
||||||
);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
@@ -1,30 +0,0 @@
|
|||||||
use crate::backend::Backend;
|
|
||||||
use crate::proxy::ConnectionContext;
|
|
||||||
use anywho::Error;
|
|
||||||
use std::sync::Arc;
|
|
||||||
use tokio::io;
|
|
||||||
use tokio::net::TcpStream;
|
|
||||||
|
|
||||||
pub async fn proxy_tcp_connection(
|
|
||||||
connection_id: u64,
|
|
||||||
mut client_stream: TcpStream,
|
|
||||||
backend: Arc<Backend>,
|
|
||||||
) -> Result<(), Error> {
|
|
||||||
let client_addr = client_stream.peer_addr()?;
|
|
||||||
|
|
||||||
let mut ctx = ConnectionContext::new(connection_id, client_addr, backend.clone());
|
|
||||||
|
|
||||||
#[cfg(debug_assertions)]
|
|
||||||
println!(
|
|
||||||
"info: conn_id={} connecting to {}",
|
|
||||||
connection_id, ctx.backend.id
|
|
||||||
);
|
|
||||||
|
|
||||||
let mut backend_stream = TcpStream::connect(&backend.address).await?;
|
|
||||||
|
|
||||||
let (tx, rx) = io::copy_bidirectional(&mut client_stream, &mut backend_stream).await?;
|
|
||||||
|
|
||||||
ctx.bytes_transferred = tx + rx;
|
|
||||||
|
|
||||||
Ok(())
|
|
||||||
}
|
|
||||||
Reference in New Issue
Block a user