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Add dns_cache for server addresses as in pgbouncer (#249)

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* Add dns_cache so server addresses are cached and invalidated when DNS changes.

Adds a module to deal with dns_cache feature. It's
main struct is CachedResolver, which is a simple thread safe
hostname <-> Ips cache with the ability to refresh resolutions
every `dns_max_ttl` seconds. This way, a client can check whether its
ip address has changed.

* Allow reloading dns cached

* Add documentation for dns_cached
This commit is contained in:
Jose Fernández
2023-05-02 10:26:40 +02:00
committed by GitHub
parent 3601130ba1
commit 7dfbd993f2
10 changed files with 794 additions and 3 deletions
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288
Cargo.lock generated
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@@ -26,6 +26,27 @@ version = "1.6.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bddcadddf5e9015d310179a59bb28c4d4b9920ad0f11e8e14dbadf654890c9a6"
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"futures-core",
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"quote",
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name = "async-trait"
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@@ -212,6 +233,12 @@ dependencies = [
"syn 1.0.109",
]
[[package]]
name = "data-encoding"
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3ee2393c4a91429dffb4bedf19f4d6abf27d8a732c8ce4980305d782e5426d57"
[[package]]
name = "digest"
version = "0.10.6"
@@ -223,6 +250,18 @@ dependencies = [
"subtle",
]
[[package]]
name = "enum-as-inner"
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c9720bba047d567ffc8a3cba48bf19126600e249ab7f128e9233e6376976a116"
dependencies = [
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[[package]]
name = "env_logger"
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@@ -275,6 +314,15 @@ version = "1.0.7"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
[[package]]
name = "form_urlencoded"
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[[package]]
name = "futures"
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@@ -410,6 +458,12 @@ version = "0.12.3"
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checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
[[package]]
name = "heck"
version = "0.4.0"
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[[package]]
name = "hermit-abi"
version = "0.2.6"
@@ -434,6 +488,17 @@ dependencies = [
"digest",
]
[[package]]
name = "hostname"
version = "0.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3c731c3e10504cc8ed35cfe2f1db4c9274c3d35fa486e3b31df46f068ef3e867"
dependencies = [
"libc",
"match_cfg",
"winapi",
]
[[package]]
name = "http"
version = "0.2.9"
@@ -522,6 +587,27 @@ dependencies = [
"cxx-build",
]
[[package]]
name = "idna"
version = "0.2.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "418a0a6fab821475f634efe3ccc45c013f742efe03d853e8d3355d5cb850ecf8"
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"unicode-normalization",
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[[package]]
name = "idna"
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checksum = "e14ddfc70884202db2244c223200c204c2bda1bc6e0998d11b5e024d657209e6"
dependencies = [
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"unicode-normalization",
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[[package]]
name = "indexmap"
version = "1.9.2"
@@ -542,6 +628,24 @@ dependencies = [
"windows-sys",
]
[[package]]
name = "ipconfig"
version = "0.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "bd302af1b90f2463a98fa5ad469fc212c8e3175a41c3068601bfa2727591c5be"
dependencies = [
"socket2",
"widestring",
"winapi",
"winreg",
]
[[package]]
name = "ipnet"
version = "2.5.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f88c5561171189e69df9d98bcf18fd5f9558300f7ea7b801eb8a0fd748bd8745"
[[package]]
name = "is-terminal"
version = "0.4.4"
@@ -589,6 +693,12 @@ dependencies = [
"wasm-bindgen",
]
[[package]]
name = "lazy_static"
version = "1.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
[[package]]
name = "libc"
version = "0.2.139"
@@ -604,6 +714,12 @@ dependencies = [
"cc",
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[[package]]
name = "linked-hash-map"
version = "0.5.6"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "0717cef1bc8b636c6e1c1bbdefc09e6322da8a9321966e8928ef80d20f7f770f"
[[package]]
name = "linux-raw-sys"
version = "0.1.4"
@@ -629,6 +745,27 @@ dependencies = [
"cfg-if",
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[[package]]
name = "lru-cache"
version = "0.1.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "31e24f1ad8321ca0e8a1e0ac13f23cb668e6f5466c2c57319f6a5cf1cc8e3b1c"
dependencies = [
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[[package]]
name = "match_cfg"
version = "0.1.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ffbee8634e0d45d258acb448e7eaab3fce7a0a467395d4d9f228e3c1f01fb2e4"
[[package]]
name = "matches"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
name = "md-5"
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@@ -737,6 +874,12 @@ dependencies = [
"windows-sys",
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[[package]]
name = "percent-encoding"
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source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "478c572c3d73181ff3c2539045f6eb99e5491218eae919370993b890cdbdd98e"
[[package]]
name = "pgcat"
version = "1.0.1"
@@ -777,7 +920,9 @@ dependencies = [
"stringprep",
"tokio",
"tokio-rustls",
"tokio-test",
"toml",
"trust-dns-resolver",
"webpki-roots",
]
@@ -888,6 +1033,12 @@ dependencies = [
"unicode-ident",
]
[[package]]
name = "quick-error"
version = "1.2.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a1d01941d82fa2ab50be1e79e6714289dd7cde78eba4c074bc5a4374f650dfe0"
[[package]]
name = "quote"
version = "1.0.26"
@@ -953,6 +1104,16 @@ version = "0.7.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b6868896879ba532248f33598de5181522d8b3d9d724dfd230911e1a7d4822f5"
[[package]]
name = "resolv-conf"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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[[package]]
name = "ring"
version = "0.16.20"
@@ -1191,6 +1352,26 @@ dependencies = [
"winapi-util",
]
[[package]]
name = "thiserror"
version = "1.0.37"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "10deb33631e3c9018b9baf9dcbbc4f737320d2b576bac10f6aefa048fa407e3e"
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[[package]]
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[[package]]
name = "time"
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@@ -1258,6 +1439,30 @@ dependencies = [
"tokio",
]
[[package]]
name = "tokio-stream"
version = "0.1.11"
source = "registry+https://github.com/rust-lang/crates.io-index"
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"tokio",
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[[package]]
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@@ -1320,9 +1525,21 @@ checksum = "8ce8c33a8d48bd45d624a6e523445fd21ec13d3653cd51f681abf67418f54eb8"
dependencies = [
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"tracing-core",
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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[[package]]
name = "tracing-core"
version = "0.1.30"
@@ -1332,6 +1549,51 @@ dependencies = [
"once_cell",
]
[[package]]
name = "trust-dns-proto"
version = "0.22.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
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@@ -1377,6 +1639,17 @@ version = "0.7.1"
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[[package]]
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@@ -1478,6 +1751,12 @@ dependencies = [
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[[package]]
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@@ -1583,3 +1862,12 @@ checksum = "faf09497b8f8b5ac5d3bb4d05c0a99be20f26fd3d5f2db7b0716e946d5103658"
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dependencies = [
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