cachey

Cargo.lock

···
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···
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···
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+ "syn 2.0.103",
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 [[package]]
···
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 [[package]]
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···
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+ "syn 2.0.103",
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+
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 [[package]]
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···
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- "syn",
+ "syn 2.0.103",
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 [[package]]
···
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···
  "regex",
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- "syn",
+ "syn 2.0.103",
  "which",
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···
  "regex",
  "rustc-hash 1.1.0",
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- "syn",
+ "syn 2.0.103",
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 [[package]]
···
  "regex",
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- "syn",
+ "syn 2.0.103",
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 [[package]]
···
 
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···
 
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 [[package]]
···
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···
  "clap",
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  "flume",
- "fs4",
+ "fs4 0.12.0",
  "headers-accept",
  "links",
  "mediatype",
···
 
 [[package]]
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+ "fnv",
+ "ident_case",
+ "proc-macro2",
+ "quote",
+ "strsim 0.10.0",
+ "syn 1.0.109",
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 [[package]]
···
  "ident_case",
  "proc-macro2",
  "quote",
- "strsim",
- "syn",
+ "strsim 0.11.1",
+ "syn 2.0.103",
+]
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+ "darling_core 0.14.4",
+ "quote",
+ "syn 1.0.109",
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 [[package]]
···
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- "darling_core",
+ "darling_core 0.20.11",
  "quote",
- "syn",
+ "syn 2.0.103",
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 [[package]]
···
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- "syn",
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 [[package]]
···
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+ "darling 0.20.11",
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 [[package]]
···
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+ "syn 2.0.103",
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 [[package]]
···
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  "quote",
- "syn",
+ "syn 2.0.103",
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 [[package]]
···
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 [[package]]
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+
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···
  "semver",
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  "serde_tokenstream",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
  "heck",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
  "once_cell",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
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 dependencies = [
+ "futures-core",
+ "futures-sink",
+ "nanorand",
  "spin",
 ]
 
···
 ]
 
 [[package]]
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+ "foyer-common",
+ "foyer-memory",
+ "foyer-storage",
+ "madsim-tokio",
+ "mixtrics",
+ "pin-project",
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+ "thiserror 2.0.12",
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+ "bytes",
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+ "fs4 0.13.1",
+ "futures-core",
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+ "itertools 0.14.0",
+ "libc",
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+ "madsim-tokio",
+ "ordered_hash_map",
+ "parking_lot",
+ "paste",
+ "pin-project",
+ "rand 0.9.1",
+ "serde",
+ "thiserror 2.0.12",
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+ "zstd",
+]
+
+[[package]]
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···
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 [[package]]
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+checksum = "8640e34b88f7652208ce9e88b1a37a2ae95227d84abec377ccd3c5cfeb141ed4"
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+
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···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 
 [[package]]
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+checksum = "43a3c133739dddd0d2990f9a4bdf8eb4b21ef50e4851ca85ab661199821d510e"
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···
  "libc",
  "percent-encoding",
  "pin-project-lite",
- "socket2",
+ "socket2 0.5.9",
  "system-configuration",
  "tokio",
  "tower-service",
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 ]
 
 [[package]]
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+checksum = "d93587f37623a1a17d94ef2bc9ada592f5465fe7732084ab7beefabe5c77c0c4"
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+ "libc",
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 dependencies = [
- "socket2",
+ "socket2 0.5.9",
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···
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 [[package]]
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···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 
 [[package]]
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-version = "0.2.171"
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-checksum = "c19937216e9d3aa9956d9bb8dfc0b0c8beb6058fc4f7a4dc4d850edf86a237d6"
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 [[package]]
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···
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 [[package]]
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+checksum = "a20b523e860d03443e98350ceaac5e71c6ba89aea7d960769ec3ce37f4de5af4"
+dependencies = [
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+
+[[package]]
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···
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 [[package]]
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+checksum = "db6694555643da293dfb89e33c2880a13b62711d64b6588bc7df6ce4110b27f1"
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+ "async-stream",
+ "async-task",
+ "bincode 1.3.3",
+ "bytes",
+ "downcast-rs",
+ "futures-util",
+ "lazy_static",
+ "libc",
+ "madsim-macros",
+ "naive-timer",
+ "panic-message",
+ "rand 0.8.5",
+ "rand_xoshiro 0.6.0",
+ "rustversion",
+ "serde",
+ "spin",
+ "tokio",
+ "tokio-util",
+ "toml",
+ "tracing",
+ "tracing-subscriber",
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+
+[[package]]
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+dependencies = [
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+dependencies = [
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+ "tokio",
+]
+
+[[package]]
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···
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+
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+checksum = "488016bfae457b036d996092f6cb448677611ce4449e970ceaf42695203f218a"
+dependencies = [
+ "autocfg",
+]
 
 [[package]]
 name = "metrics"
···
 ]
 
 [[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adbcddf5a90b959eea97ae505e0391f5c6dd411fbf546d43b9c59ad1c3bd4391"
+dependencies = [
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+ "parking_lot",
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+
+[[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
···
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 [[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "034a0ad7deebf0c2abcf2435950a6666c3c15ea9d8fad0c0f48efa8a7f843fed"
+
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+dependencies = [
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+]
+
+[[package]]
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···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 ]
 
 [[package]]
+name = "ordered_hash_map"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab0e5f22bf6dd04abd854a8874247813a8fa2c8c1260eba6fbb150270ce7c176"
+dependencies = [
+ "hashbrown 0.13.2",
+]
+
+[[package]]
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 source = "registry+https://github.com/rust-lang/crates.io-index"
···
  "elliptic-curve",
  "primeorder",
 ]
+
+[[package]]
+name = "panic-message"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "384e52fd8fbd4cbe3c317e8216260c21a0f9134de108cea8a4dd4e7e152c472d"
 
 [[package]]
 name = "parking"
···
  "pest_meta",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 ]
 
 [[package]]
+name = "pin-project"
+version = "1.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "677f1add503faace112b9f1373e43e9e054bfdd22ff1a63c1bc485eaec6a6a8a"
+dependencies = [
+ "pin-project-internal",
+]
+
+[[package]]
+name = "pin-project-internal"
+version = "1.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6e918e4ff8c4549eb882f14b3a4bc8c8bc93de829416eacf579f1207a8fbf861"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.103",
+]
+
+[[package]]
 name = "pin-project-lite"
 version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
···
 checksum = "6837b9e10d61f45f987d50808f83d1ee3d206c66acf650c3e4ae2e1f6ddedf55"
 dependencies = [
  "proc-macro2",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
  "proc-macro2",
  "quote",
  "serde_derive_internals",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 
 [[package]]
 name = "serde_json"
-version = "1.0.140"
+version = "1.0.141"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "20068b6e96dc6c9bd23e01df8827e6c7e1f2fddd43c21810382803c136b99373"
+checksum = "30b9eff21ebe718216c6ec64e1d9ac57087aad11efc64e32002bce4a0d4c03d3"
 dependencies = [
  "itoa",
  "memchr",
···
  "proc-macro2",
  "quote",
  "serde",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8d00caa5193a3c8362ac2b73be6b9e768aa5a4b2f721d8f4b339600c3cb51f8e"
 dependencies = [
- "darling",
+ "darling 0.20.11",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 ]
 
 [[package]]
+name = "slingshot"
+version = "0.1.0"
+dependencies = [
+ "axum",
+ "clap",
+ "ctrlc",
+ "env_logger",
+ "foyer",
+ "jetstream",
+ "log",
+ "metrics",
+ "metrics-exporter-prometheus 0.17.2",
+ "serde",
+ "serde_json",
+ "thiserror 2.0.12",
+ "tokio",
+ "tokio-util",
+]
+
+[[package]]
 name = "slog"
 version = "2.7.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
···
 ]
 
 [[package]]
+name = "socket2"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "233504af464074f9d066d7b5416c5f9b894a5862a6506e306f7b816cdd6f1807"
+dependencies = [
+ "libc",
+ "windows-sys 0.59.0",
+]
+
+[[package]]
 name = "spacedust"
 version = "0.1.0"
 dependencies = [
···
 
 [[package]]
 name = "strsim"
+version = "0.10.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "73473c0e59e6d5812c5dfe2a064a6444949f089e20eec9a2e5506596494e4623"
+
+[[package]]
+name = "strsim"
 version = "0.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7da8b5736845d9f2fcb837ea5d9e2628564b3b043a70948a3f0b778838c5fb4f"
···
 
 [[package]]
 name = "syn"
+version = "1.0.109"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "72b64191b275b66ffe2469e8af2c1cfe3bafa67b529ead792a6d0160888b4237"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "syn"
 version = "2.0.103"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e4307e30089d6fd6aff212f2da3a1f9e32f3223b1f010fb09b7c95f90f3ca1e8"
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 
 [[package]]
 name = "tokio"
-version = "1.45.1"
+version = "1.47.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "75ef51a33ef1da925cea3e4eb122833cb377c61439ca401b770f54902b806779"
+checksum = "43864ed400b6043a4757a25c7a64a8efde741aed79a056a2fb348a406701bb35"
 dependencies = [
  "backtrace",
  "bytes",
+ "io-uring",
  "libc",
  "mio",
  "parking_lot",
  "pin-project-lite",
  "signal-hook-registry",
- "socket2",
+ "slab",
+ "socket2 0.6.0",
  "tokio-macros",
- "windows-sys 0.52.0",
+ "windows-sys 0.59.0",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "log",
  "pin-project-lite",
+ "tracing-attributes",
  "tracing-core",
 ]
 
 [[package]]
+name = "tracing-attributes"
+version = "0.1.30"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "81383ab64e72a7a8b8e13130c49e3dab29def6d0c7d76a03087b3cf71c5c6903"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.103",
+]
+
+[[package]]
 name = "tracing-core"
 version = "0.1.33"
 source = "registry+https://github.com/rust-lang/crates.io-index"
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
  "sha1",
  "thiserror 2.0.12",
  "utf-8",
+]
+
+[[package]]
+name = "twox-hash"
+version = "2.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b907da542cbced5261bd3256de1b3a1bf340a3d37f93425a07362a1d687de56"
+dependencies = [
+ "rand 0.9.1",
 ]
 
 [[package]]
···
  "log",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
  "wasm-bindgen-shared",
 ]
 
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
  "wasm-bindgen-backend",
  "wasm-bindgen-shared",
 ]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
  "synstructure",
 ]
 
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
  "synstructure",
 ]
 
···
 dependencies = [
  "proc-macro2",
  "quote",
- "syn",
+ "syn 2.0.103",
 ]
 
 [[package]]

Cargo.toml

···
     "ufos/fuzz",
     "spacedust",
     "who-am-i",
+    "slingshot",
 ]

slingshot/.gitignore

···
+foyer

slingshot/Cargo.toml

···
+[package]
+name = "slingshot"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+clap = { version = "4.5.41", features = ["derive"] }
+ctrlc = "3.4.7"
+env_logger = "0.11.8"
+foyer = { version = "0.18.0", features = ["serde"] }
+jetstream = { path = "../jetstream", features = ["metrics"] }
+log = "0.4.27"
+metrics = "0.24.2"
+metrics-exporter-prometheus = { version = "0.17.1", features = ["http-listener"] }
+serde = { version = "1.0.219", features = ["derive"] }
+serde_json = { version = "1.0.141", features = ["raw_value"] }
+thiserror = "2.0.12"
+tokio = { version = "1.47.0", features = ["full"] }
+tokio-util = "0.7.15"

slingshot/src/consumer.rs

···
+use crate::CachedRecord;
+use foyer::HybridCache;
+use crate::error::ConsumerError;
+use jetstream::{
+    DefaultJetstreamEndpoints, JetstreamCompression, JetstreamConfig, JetstreamConnector,
+    events::{CommitOp, Cursor, EventKind},
+};
+use tokio_util::sync::CancellationToken;
+
+pub async fn consume(
+    jetstream_endpoint: String,
+    cursor: Option<Cursor>,
+    no_zstd: bool,
+    shutdown: CancellationToken,
+    cache: HybridCache<String, CachedRecord>,
+) -> Result<(), ConsumerError> {
+    let endpoint = DefaultJetstreamEndpoints::endpoint_or_shortcut(&jetstream_endpoint);
+    if endpoint == jetstream_endpoint {
+        log::info!("consumer: connecting jetstream at {endpoint}");
+    } else {
+        log::info!("consumer: connecting jetstream at {jetstream_endpoint} => {endpoint}");
+    }
+    let config: JetstreamConfig = JetstreamConfig {
+        endpoint,
+        compression: if no_zstd {
+            JetstreamCompression::None
+        } else {
+            JetstreamCompression::Zstd
+        },
+        replay_on_reconnect: true,
+        channel_size: 1024, // buffer up to ~1s of jetstream events
+        ..Default::default()
+    };
+    let mut receiver = JetstreamConnector::new(config)?
+        .connect_cursor(cursor)
+        .await?;
+
+    log::info!("consumer: receiving messages..");
+    loop {
+        if shutdown.is_cancelled() {
+            log::info!("consumer: exiting for shutdown");
+            return Ok(());
+        }
+        let Some(mut event) = receiver.recv().await else {
+            log::error!("consumer: could not receive event, bailing");
+            break;
+        };
+
+        if event.kind != EventKind::Commit {
+            continue;
+        }
+        let Some(ref mut commit) = event.commit else {
+            log::warn!("consumer: commit event missing commit data, ignoring");
+            continue;
+        };
+
+        // TODO: something a bit more robust
+        let at_uri = format!(
+            "at://{}/{}/{}",
+            &*event.did, &*commit.collection, &*commit.rkey
+        );
+
+        if commit.operation == CommitOp::Delete {
+            cache.insert(at_uri, CachedRecord::Deleted);
+        } else {
+            let Some(record) = commit.record.take() else {
+                log::warn!("consumer: commit update/delete missing record, ignoring");
+                continue;
+            };
+
+            cache.insert(at_uri, CachedRecord::Found(record.into()));
+        }
+    }
+
+    Err(ConsumerError::JetstreamEnded)
+}

slingshot/src/error.rs

···
+use thiserror::Error;
+
+#[derive(Debug, Error)]
+pub enum ConsumerError {
+    #[error(transparent)]
+    JetstreamConnectionError(#[from] jetstream::error::ConnectionError),
+    #[error(transparent)]
+    JetstreamConfigValidationError(#[from] jetstream::error::ConfigValidationError),
+    #[error("jetstream ended")]
+    JetstreamEnded,
+    #[error("delay queue output dropped")]
+    DelayQueueOutputDropped,
+}
+
+#[derive(Debug, Error)]
+pub enum MainTaskError {
+    #[error(transparent)]
+    ConsumerTaskError(#[from] ConsumerError),
+    // #[error(transparent)]
+    // ServerTaskError(#[from] ServerError),
+}

slingshot/src/firehose_cache.rs

···
+use std::path::Path;
+use crate::CachedRecord;
+use foyer::{HybridCache, DirectFsDeviceOptions, Engine, HybridCacheBuilder};
+
+
+pub async fn firehose_cache(dir: impl AsRef<Path>) -> Result<HybridCache<String, CachedRecord>, String> {
+    let cache = HybridCacheBuilder::new()
+        .with_name("firehose")
+        .memory(64 * 2_usize.pow(20))
+        .with_weighter(|k: &String, v| k.len() + std::mem::size_of_val(v))
+        .storage(Engine::large())
+        .with_device_options(DirectFsDeviceOptions::new(dir))
+        .build()
+        .await
+        .map_err(|e| format!("foyer setup error: {e:?}"))?;
+    Ok(cache)
+}

slingshot/src/lib.rs

···
+mod consumer;
+pub mod error;
+mod firehose_cache;
+mod record;
+
+pub use consumer::consume;
+pub use firehose_cache::firehose_cache;
+pub use record::CachedRecord;

slingshot/src/main.rs

···
+// use foyer::HybridCache;
+// use foyer::{Engine, DirectFsDeviceOptions, HybridCacheBuilder};
+use metrics_exporter_prometheus::PrometheusBuilder;
+use slingshot::{consume, error::MainTaskError, firehose_cache};
+
+use clap::Parser;
+use tokio_util::sync::CancellationToken;
+
+
+/// Slingshot record edge cache
+#[derive(Parser, Debug, Clone)]
+#[command(version, about, long_about = None)]
+struct Args {
+    /// Jetstream server to connect to (exclusive with --fixture). Provide either a wss:// URL, or a shorhand value:
+    /// 'us-east-1', 'us-east-2', 'us-west-1', or 'us-west-2'
+    #[arg(long)]
+    jetstream: String,
+    /// don't request zstd-compressed jetstream events
+    ///
+    /// reduces CPU at the expense of more ingress bandwidth
+    #[arg(long, action)]
+    jetstream_no_zstd: bool,
+}
+
+#[tokio::main]
+async fn main() -> Result<(), String> {
+    env_logger::init();
+
+    let shutdown = CancellationToken::new();
+
+    let ctrlc_shutdown = shutdown.clone();
+    ctrlc::set_handler(move || ctrlc_shutdown.cancel()).expect("failed to set ctrl-c handler");
+
+    let args = Args::parse();
+
+    if let Err(e) = install_metrics_server() {
+        log::error!("failed to install metrics server: {e:?}");
+    } else {
+        log::info!("metrics listening at http://0.0.0.0:8765");
+    }
+
+    log::info!("setting up firehose cache...");
+    let cache = firehose_cache("./foyer").await?;
+    log::info!("firehose cache ready.");
+
+    let mut tasks: tokio::task::JoinSet<Result<(), MainTaskError>> = tokio::task::JoinSet::new();
+
+    let consumer_shutdown = shutdown.clone();
+    tasks.spawn(async move {
+        consume(
+            args.jetstream,
+            None,
+            args.jetstream_no_zstd,
+            consumer_shutdown,
+            cache,
+        )
+        .await?;
+        Ok(())
+    });
+
+
+    tokio::select! {
+        _ = shutdown.cancelled() => log::warn!("shutdown requested"),
+        Some(r) = tasks.join_next() => {
+            log::warn!("a task exited, shutting down: {r:?}");
+            shutdown.cancel();
+        }
+    }
+
+    tokio::select! {
+        _ = async {
+            while let Some(completed) = tasks.join_next().await {
+                log::info!("shutdown: task completed: {completed:?}");
+            }
+        } => {},
+        _ = tokio::time::sleep(std::time::Duration::from_secs(3)) => {
+            log::info!("shutdown: not all tasks completed on time. aborting...");
+            tasks.shutdown().await;
+        },
+    }
+
+    log::info!("bye!");
+
+    Ok(())
+}
+
+fn install_metrics_server() -> Result<(), metrics_exporter_prometheus::BuildError> {
+    log::info!("installing metrics server...");
+    let host = [0, 0, 0, 0];
+    let port = 8765;
+    PrometheusBuilder::new()
+        .set_quantiles(&[0.5, 0.9, 0.99, 1.0])?
+        .set_bucket_duration(std::time::Duration::from_secs(300))?
+        .set_bucket_count(std::num::NonZero::new(12).unwrap()) // count * duration = 60 mins. stuff doesn't happen that fast here.
+        .set_enable_unit_suffix(false) // this seemed buggy for constellation (sometimes wouldn't engage)
+        .with_http_listener((host, port))
+        .install()?;
+    log::info!(
+        "metrics server installed! listening on http://{}.{}.{}.{}:{port}",
+        host[0],
+        host[1],
+        host[2],
+        host[3]
+    );
+    Ok(())
+}
+

slingshot/src/record.rs

···
+use serde_json::value::RawValue;
+use serde::{Serialize, Deserialize};
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct RawRecord(String);
+
+impl From<Box<RawValue>> for RawRecord {
+    fn from(rv: Box<RawValue>) -> Self {
+        Self(rv.get().to_string())
+    }
+}
+
+/// only for use with stored (validated) values, not general strings
+impl From<RawRecord> for Box<RawValue> {
+    fn from(RawRecord(s): RawRecord) -> Self {
+        RawValue::from_string(s).expect("stored string from RawValue to be valid")
+    }
+}
+
+#[derive(Debug, Serialize, Deserialize)]
+pub enum CachedRecord {
+    Found(RawRecord),
+    Deleted,
+}