From a91044c0a91be32f0e5239089ca312501bbff72d Mon Sep 17 00:00:00 2001
From: mat ess <mat@mat.services>
Date: Thu, 20 Apr 2023 22:00:54 -0400
Subject: [PATCH] Add initial (buggy) fetch implementation

---
 Cargo.lock               | 1199 +++++++++++++++++++++++++++++++++++++-
 Cargo.toml               |    3 +
 benches/bench_library.rs |   11 +-
 justfile                 |   11 +
 src/fetch.rs             |  111 ++++
 src/lib.rs               |    1 +
 src/main.rs              |   42 +-
 7 files changed, 1358 insertions(+), 20 deletions(-)
 create mode 100644 justfile
 create mode 100644 src/fetch.rs

diff --git a/Cargo.lock b/Cargo.lock
index f91a0ca..e2fd752 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,6 +2,15 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "anes"
 version = "0.1.6"
@@ -25,6 +34,12 @@ version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "base64"
+version = "0.21.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a4a4ddaa51a5bc52a6948f74c06d20aaaddb71924eab79b8c97a8c556e942d6a"
+
 [[package]]
 name = "bitflags"
 version = "1.3.2"
@@ -37,18 +52,46 @@ version = "3.12.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0d261e256854913907f67ed06efbc3338dfe6179796deefc1ff763fc1aee5535"
 
+[[package]]
+name = "bytes"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89b2fd2a0dcf38d7971e2194b6b6eebab45ae01067456a7fd93d5547a61b70be"
+
 [[package]]
 name = "cast"
 version = "0.3.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "37b2a672a2cb129a2e41c10b1224bb368f9f37a2b16b612598138befd7b37eb5"
 
+[[package]]
+name = "cc"
+version = "1.0.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
 
+[[package]]
+name = "chrono"
+version = "0.4.24"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4e3c5919066adf22df73762e50cffcde3a758f2a848b113b586d1f86728b673b"
+dependencies = [
+ "iana-time-zone",
+ "js-sys",
+ "num-integer",
+ "num-traits",
+ "serde",
+ "time",
+ "wasm-bindgen",
+ "winapi",
+]
+
 [[package]]
 name = "ciborium"
 version = "0.2.0"
@@ -97,13 +140,42 @@ dependencies = [
  "os_str_bytes",
 ]
 
+[[package]]
+name = "codespan-reporting"
+version = "0.11.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3538270d33cc669650c4b093848450d380def10c331d38c768e34cac80576e6e"
+dependencies = [
+ "termcolor",
+ "unicode-width",
+]
+
+[[package]]
+name = "core-foundation"
+version = "0.9.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "194a7a9e6de53fa55116934067c844d9d749312f75c6f6d0980e8c252f8c2146"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e496a50fda8aacccc86d7529e2c1e0892dbd0f898a6b5645b5561b89c3210efa"
+
 [[package]]
 name = "cover"
 version = "0.1.0"
 dependencies = [
  "criterion",
+ "musicbrainz_rs",
  "nanoserde",
+ "pico-args",
  "rand",
+ "tokio",
 ]
 
 [[package]]
@@ -185,12 +257,214 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "cxx"
+version = "1.0.94"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f61f1b6389c3fe1c316bf8a4dccc90a38208354b330925bce1f74a6c4756eb93"
+dependencies = [
+ "cc",
+ "cxxbridge-flags",
+ "cxxbridge-macro",
+ "link-cplusplus",
+]
+
+[[package]]
+name = "cxx-build"
+version = "1.0.94"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12cee708e8962df2aeb38f594aae5d827c022b6460ac71a7a3e2c3c2aae5a07b"
+dependencies = [
+ "cc",
+ "codespan-reporting",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "scratch",
+ "syn 2.0.15",
+]
+
+[[package]]
+name = "cxxbridge-flags"
+version = "1.0.94"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7944172ae7e4068c533afbb984114a56c46e9ccddda550499caa222902c7f7bb"
+
+[[package]]
+name = "cxxbridge-macro"
+version = "1.0.94"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2345488264226bf682893e25de0769f3360aac9957980ec49361b083ddaa5bc5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
 [[package]]
 name = "either"
 version = "1.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "7fcaabb2fef8c910e7f4c7ce9f67a1283a1715879a7c230ca9d6d1ae31f16d91"
 
+[[package]]
+name = "encoding_rs"
+version = "0.8.32"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "071a31f4ee85403370b58aca746f01041ede6f0da2730960ad001edc2b71b394"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "errno"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4bcfec3a70f97c962c307b2d2c56e358cf1d00b558d74262b5f929ee8cc7e73a"
+dependencies = [
+ "errno-dragonfly",
+ "libc",
+ "windows-sys 0.48.0",
+]
+
+[[package]]
+name = "errno-dragonfly"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "aa68f1b12764fab894d2755d2518754e71b4fd80ecfb822714a1206c2aab39bf"
+dependencies = [
+ "cc",
+ "libc",
+]
+
+[[package]]
+name = "fastrand"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e51093e27b0797c359783294ca4f0a911c270184cb10f85783b118614a1501be"
+dependencies = [
+ "instant",
+]
+
+[[package]]
+name = "fnv"
+version = "1.0.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3f9eec918d3f24069decb9af1554cad7c880e2da24a9afd88aca000531ab82c1"
+
+[[package]]
+name = "foreign-types"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
+dependencies = [
+ "foreign-types-shared",
+]
+
+[[package]]
+name = "foreign-types-shared"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
+
+[[package]]
+name = "form_urlencoded"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a9c384f161156f5260c24a097c56119f9be8c798586aecc13afbcbe7b7e26bf8"
+dependencies = [
+ "percent-encoding",
+]
+
+[[package]]
+name = "futures"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "23342abe12aba583913b2e62f22225ff9c950774065e4bfb61a19cd9770fec40"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-executor",
+ "futures-io",
+ "futures-sink",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
+name = "futures-channel"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "955518d47e09b25bbebc7a18df10b81f0c766eaf4c4f1cccef2fca5f2a4fb5f2"
+dependencies = [
+ "futures-core",
+ "futures-sink",
+]
+
+[[package]]
+name = "futures-core"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4bca583b7e26f571124fe5b7561d49cb2868d79116cfa0eefce955557c6fee8c"
+
+[[package]]
+name = "futures-executor"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ccecee823288125bd88b4d7f565c9e58e41858e47ab72e8ea2d64e93624386e0"
+dependencies = [
+ "futures-core",
+ "futures-task",
+ "futures-util",
+]
+
+[[package]]
+name = "futures-io"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fff74096e71ed47f8e023204cfd0aa1289cd54ae5430a9523be060cdb849964"
+
+[[package]]
+name = "futures-macro"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "89ca545a94061b6365f2c7355b4b32bd20df3ff95f02da9329b34ccc3bd6ee72"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.15",
+]
+
+[[package]]
+name = "futures-sink"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f43be4fe21a13b9781a69afa4985b0f6ee0e1afab2c6f454a8cf30e2b2237b6e"
+
+[[package]]
+name = "futures-task"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "76d3d132be6c0e6aa1534069c705a74a5997a356c0dc2f86a47765e5617c5b65"
+
+[[package]]
+name = "futures-util"
+version = "0.3.28"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26b01e40b772d54cf6c6d721c1d1abd0647a0106a12ecaa1c186273392a69533"
+dependencies = [
+ "futures-channel",
+ "futures-core",
+ "futures-io",
+ "futures-macro",
+ "futures-sink",
+ "futures-task",
+ "memchr",
+ "pin-project-lite",
+ "pin-utils",
+ "slab",
+]
+
 [[package]]
 name = "getrandom"
 version = "0.2.9"
@@ -199,7 +473,26 @@ checksum = "c85e1d9ab2eadba7e5040d4e09cbd6d072b76a557ad64e797c2cb9d4da21d7e4"
 dependencies = [
  "cfg-if",
  "libc",
- "wasi",
+ "wasi 0.11.0+wasi-snapshot-preview1",
+]
+
+[[package]]
+name = "h2"
+version = "0.3.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17f8a914c2987b688368b5138aa05321db91f4090cf26118185672ad588bce21"
+dependencies = [
+ "bytes",
+ "fnv",
+ "futures-core",
+ "futures-sink",
+ "futures-util",
+ "http",
+ "indexmap",
+ "slab",
+ "tokio",
+ "tokio-util",
+ "tracing",
 ]
 
 [[package]]
@@ -232,6 +525,117 @@ dependencies = [
  "libc",
 ]
 
+[[package]]
+name = "hermit-abi"
+version = "0.3.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "fed44880c466736ef9a5c5b5facefb5ed0785676d0c02d612db14e54f0d84286"
+
+[[package]]
+name = "http"
+version = "0.2.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bd6effc99afb63425aff9b05836f029929e345a6148a14b7ecd5ab67af944482"
+dependencies = [
+ "bytes",
+ "fnv",
+ "itoa",
+]
+
+[[package]]
+name = "http-body"
+version = "0.4.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d5f38f16d184e36f2408a55281cd658ecbd3ca05cce6d6510a176eca393e26d1"
+dependencies = [
+ "bytes",
+ "http",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "httparse"
+version = "1.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d897f394bad6a705d5f4104762e116a75639e470d80901eed05a860a95cb1904"
+
+[[package]]
+name = "httpdate"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c4a1e36c821dbe04574f602848a19f742f4fb3c98d40449f11bcad18d6b17421"
+
+[[package]]
+name = "hyper"
+version = "0.14.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ab302d72a6f11a3b910431ff93aae7e773078c769f0a3ef15fb9ec692ed147d4"
+dependencies = [
+ "bytes",
+ "futures-channel",
+ "futures-core",
+ "futures-util",
+ "h2",
+ "http",
+ "http-body",
+ "httparse",
+ "httpdate",
+ "itoa",
+ "pin-project-lite",
+ "socket2",
+ "tokio",
+ "tower-service",
+ "tracing",
+ "want",
+]
+
+[[package]]
+name = "hyper-tls"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d6183ddfa99b85da61a140bea0efc93fdf56ceaa041b37d553518030827f9905"
+dependencies = [
+ "bytes",
+ "hyper",
+ "native-tls",
+ "tokio",
+ "tokio-native-tls",
+]
+
+[[package]]
+name = "iana-time-zone"
+version = "0.1.56"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0722cd7114b7de04316e7ea5456a0bbb20e4adb46fd27a3697adb812cff0f37c"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "wasm-bindgen",
+ "windows",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0703ae284fc167426161c2e3f1da3ea71d94b21bedbcc9494e92b28e334e3dca"
+dependencies = [
+ "cxx",
+ "cxx-build",
+]
+
+[[package]]
+name = "idna"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e14ddfc70884202db2244c223200c204c2bda1bc6e0998d11b5e024d657209e6"
+dependencies = [
+ "unicode-bidi",
+ "unicode-normalization",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.9.3"
@@ -242,6 +646,32 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "instant"
+version = "0.1.12"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a5bbe824c507c5da5956355e86a746d82e0e1464f65d862cc5e71da70e94b2c"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "io-lifetimes"
+version = "1.0.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c66c74d2ae7e79a5a8f7ac924adbe38ee42a859c6539ad869eb51f0b52dc220"
+dependencies = [
+ "hermit-abi 0.3.1",
+ "libc",
+ "windows-sys 0.48.0",
+]
+
+[[package]]
+name = "ipnet"
+version = "2.7.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "12b6ee2129af8d4fb011108c73d99a1b83a85977f23b82460c0ae2e25bb4b57f"
+
 [[package]]
 name = "itertools"
 version = "0.10.5"
@@ -278,6 +708,31 @@ version = "0.2.141"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "3304a64d199bb964be99741b7a14d26972741915b3649639149b2479bb46f4b5"
 
+[[package]]
+name = "link-cplusplus"
+version = "1.0.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ecd207c9c713c34f95a097a5b029ac2ce6010530c7b49d7fea24d977dede04f5"
+dependencies = [
+ "cc",
+]
+
+[[package]]
+name = "linux-raw-sys"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b085a4f2cde5781fc4b1717f2e86c62f5cda49de7ba99a7c2eae02b61c9064c"
+
+[[package]]
+name = "lock_api"
+version = "0.4.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "435011366fe56583b16cf956f9df0095b405b82d76425bc8981c0e22e60ec4df"
+dependencies = [
+ "autocfg",
+ "scopeguard",
+]
+
 [[package]]
 name = "log"
 version = "0.4.17"
@@ -287,6 +742,32 @@ dependencies = [
  "cfg-if",
 ]
 
+[[package]]
+name = "lucene_query_builder"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "06a250d084897852aa59e2be2aa5684eee4adf71b03488fa578abc2d5be8721c"
+dependencies = [
+ "lucene_query_builder_rs_derive",
+]
+
+[[package]]
+name = "lucene_query_builder_rs_derive"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "97eabbb248dbc18c187c5ce1de50a479a835e8352a7f1506f4b321ccfd19d3e6"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.109",
+]
+
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
 [[package]]
 name = "memoffset"
 version = "0.8.0"
@@ -296,6 +777,39 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "mime"
+version = "0.3.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6877bb514081ee2a7ff5ef9de3281f14a4dd4bceac4c09388074a6b5df8a139a"
+
+[[package]]
+name = "mio"
+version = "0.8.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5b9d9a46eff5b4ff64b45a9e316a6d1e0bc719ef429cbec4dc630684212bfdf9"
+dependencies = [
+ "libc",
+ "log",
+ "wasi 0.11.0+wasi-snapshot-preview1",
+ "windows-sys 0.45.0",
+]
+
+[[package]]
+name = "musicbrainz_rs"
+version = "0.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8baffdd450f73b33d47c91b509eebc25233c8e0f896f9c0c83d72f53b4e9fb63"
+dependencies = [
+ "chrono",
+ "lucene_query_builder",
+ "once_cell",
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+ "serde",
+ "serde_json",
+ "wasm-timer",
+]
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 checksum = "ed7a94da6c6181c35d043fc61c43ac96d3a5d739e7b8027f77650ba41504d6ab"
 
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+ "lazy_static",
+ "libc",
+ "log",
+ "openssl",
+ "openssl-probe",
+ "openssl-sys",
+ "schannel",
+ "security-framework",
+ "security-framework-sys",
+ "tempfile",
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+dependencies = [
+ "autocfg",
+ "num-traits",
+]
+
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+
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@@ -452,6 +1116,24 @@ dependencies = [
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+[[package]]
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+checksum = "fb5a58c1855b4b6819d59012155603f0b22ad30cad752600aadfcb695265519a"
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+dependencies = [
+ "bitflags",
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+ "http",
+ "http-body",
+ "hyper",
+ "hyper-tls",
+ "ipnet",
+ "js-sys",
+ "log",
+ "mime",
+ "native-tls",
+ "once_cell",
+ "percent-encoding",
+ "pin-project-lite",
+ "serde",
+ "serde_json",
+ "serde_urlencoded",
+ "tokio",
+ "tokio-native-tls",
+ "tower-service",
+ "url",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+ "winreg",
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+ "errno",
+ "io-lifetimes",
+ "libc",
+ "linux-raw-sys",
+ "windows-sys 0.48.0",
+]
+
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@@ -482,12 +1215,50 @@ dependencies = [
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+ "core-foundation",
+ "core-foundation-sys",
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+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
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@@ -519,6 +1290,52 @@ dependencies = [
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+[[package]]
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+ "libc",
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+]
+
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@@ -541,12 +1358,45 @@ dependencies = [
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+[[package]]
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+]
+
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+ "wasi 0.10.0+wasi-snapshot-preview1",
+ "winapi",
+]
+
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@@ -557,12 +1407,151 @@ dependencies = [
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+ "libc",
+ "mio",
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+ "pin-project-lite",
+ "signal-hook-registry",
+ "socket2",
+ "tokio-macros",
+ "windows-sys 0.45.0",
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+
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@@ -573,6 +1562,22 @@ dependencies = [
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+dependencies = [
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+
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@@ -604,6 +1609,18 @@ dependencies = [
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+dependencies = [
+ "cfg-if",
+ "js-sys",
+ "wasm-bindgen",
+ "web-sys",
+]
+
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@@ -633,6 +1650,21 @@ version = "0.2.84"
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+[[package]]
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+dependencies = [
+ "futures",
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+ "parking_lot 0.11.2",
+ "pin-utils",
+ "wasm-bindgen",
+ "wasm-bindgen-futures",
+ "web-sys",
+]
+
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@@ -673,3 +1705,168 @@ name = "winapi-x86_64-pc-windows-gnu"
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 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
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+ "windows_i686_msvc 0.42.2",
+ "windows_x86_64_gnu 0.42.2",
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+]
diff --git a/Cargo.toml b/Cargo.toml
index e5a4cd0..11d7647 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -6,7 +6,10 @@ edition = "2021"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
+musicbrainz_rs = "0.5.0"
 nanoserde = "0.1.32"
+pico-args = { version = "0.5.0", features = ["eq-separator", "short-space-opt", "combined-flags"] }
+tokio = { version = "1.27.0", features = ["full"] }
 
 [dev-dependencies]
 criterion = "0.4.0"
diff --git a/benches/bench_library.rs b/benches/bench_library.rs
index 858d01d..4c544c8 100644
--- a/benches/bench_library.rs
+++ b/benches/bench_library.rs
@@ -15,10 +15,6 @@ fn bench_random_library(c: &mut Criterion) {
     bench_random_library_with_sizes(c, "massive", 1000, 2500);
 }
 
-fn bench_supermassive_random_library(c: &mut Criterion) {
-    bench_random_library_with_sizes(c, "supermassive", 2500, 7500);
-}
-
 // benchmark helpers
 
 fn bench_random_library_with_sizes(c: &mut Criterion, size: &str, artists: usize, songs: usize) {
@@ -70,9 +66,4 @@ fn random_library(artists: usize, songs_per_artist: usize) -> Library {
 // entrypoint
 
 criterion_group!(benches, bench_random_library);
-criterion_group! {
-    name = slow_benches;
-    config = Criterion::default().sample_size(20);
-    targets = bench_supermassive_random_library
-}
-criterion_main!(benches, slow_benches);
+criterion_main!(benches);
diff --git a/justfile b/justfile
new file mode 100644
index 0000000..255d732
--- /dev/null
+++ b/justfile
@@ -0,0 +1,11 @@
+bench:
+    cargo bench --profile release -- "#rnd"
+
+bench-supermassive:
+    cargo bench --profile release -- "#spr"
+
+bench-all:
+    cargo bench --profile release
+
+flamegraph:
+    cargo flamegraph --bench bench_library --root --open -- --bench --profile-time 10
diff --git a/src/fetch.rs b/src/fetch.rs
new file mode 100644
index 0000000..d2b64a7
--- /dev/null
+++ b/src/fetch.rs
@@ -0,0 +1,111 @@
+use std::collections::HashSet;
+
+use musicbrainz_rs::{
+    config,
+    entity::{
+        artist::{Artist, ArtistSearchQuery, ArtistType},
+        recording::Recording,
+        relations::{Relation, RelationContent},
+    },
+    prelude::*,
+};
+
+use crate::library;
+
+const USER_AGENT: &str = "cover/0.1.0 ( mat@mat.services )";
+
+pub async fn fetch_library(
+    names: impl IntoIterator<Item = String>,
+) -> Result<library::Library, Error> {
+    config::set_user_agent(USER_AGENT);
+    let mut artists = vec![];
+    for name in names {
+        let artist = fetch_artist(name).await?;
+        println!("{artist:#?}");
+        artists.push(artist);
+    }
+    Ok(library::Library::new(artists))
+}
+
+async fn fetch_artist(name: String) -> Result<library::Artist, Error> {
+    let query = ArtistSearchQuery::query_builder().artist(&name).build();
+    let result = Artist::search(query)
+        .with_artist_relations()
+        .execute()
+        .await?;
+    let artist = result.entities.first().expect("Failed to load {name}");
+    let artist = Artist::fetch()
+        .id(&artist.id)
+        .with_artist_relations()
+        .execute()
+        .await?;
+    let members =
+        if artist.artist_type.is_some() && is_plural_artist(artist.artist_type.as_ref().unwrap()) {
+            artist
+                .relations
+                .as_ref()
+                .expect("Failed to load relations")
+                .iter()
+                .flat_map(member_from_relation)
+                .collect()
+        } else {
+            vec![artist.name.clone()]
+        };
+    let recordings = Recording::browse()
+        .by_artist(&artist.id)
+        .with_work_relations()
+        .with_work_level_relations()
+        .execute()
+        .await?;
+    let catalog = recordings
+        .entities
+        .into_iter()
+        .map(|recording| convert_recording(&artist, &members, recording));
+    Ok(library::Artist::new(name, members.clone(), catalog))
+}
+
+fn is_plural_artist(kind: &ArtistType) -> bool {
+    matches!(
+        kind,
+        ArtistType::Choir | ArtistType::Group | ArtistType::Orchestra
+    )
+}
+
+fn member_from_relation(relation: &Relation) -> Option<String> {
+    if relation.relation_type == "member of band" {
+        let artist = extract_artist(relation);
+        Some(artist.name.clone())
+    } else {
+        None
+    }
+}
+
+fn convert_recording(artist: &Artist, members: &[String], recording: Recording) -> library::Song {
+    let writers = get_writers(members, &recording);
+    library::Song {
+        title: recording.title,
+        performer: artist.name.clone(),
+        writers,
+    }
+}
+
+fn get_writers(members: &[String], recording: &Recording) -> HashSet<String> {
+    recording.relations.as_ref().map_or_else(
+        || HashSet::from_iter(members.iter().cloned()),
+        |relations| relations.iter().flat_map(writer_from_relation).collect(),
+    )
+}
+
+fn writer_from_relation(relation: &Relation) -> Option<String> {
+    match relation.relation_type.as_str() {
+        "writer" | "composer" => Some(extract_artist(relation).name.clone()),
+        _ => None,
+    }
+}
+
+fn extract_artist(relation: &Relation) -> &Artist {
+    match &relation.content {
+        RelationContent::Artist(artist) => artist,
+        _ => unreachable!("Bad relation"),
+    }
+}
diff --git a/src/lib.rs b/src/lib.rs
index 28ca5ca..6af999a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1 +1,2 @@
+pub mod fetch;
 pub mod library;
diff --git a/src/main.rs b/src/main.rs
index cba449a..145178b 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,16 +1,40 @@
-use std::{env, fs};
+use std::fs;
+use std::process::exit;
 
 use nanoserde::DeJson;
+use pico_args::Arguments;
 
-use cover::library::Library;
+use cover::fetch::fetch_library;
 
-fn main() {
-    let file_path = env::args()
-        .nth(1)
-        .expect("Usage: cover path/to/library.json");
-    let json = fs::read_to_string(file_path).expect("Failed to open library file");
-    let library: Library =
-        DeJson::deserialize_json(&json).expect("Failed to deserialize library file");
+const USAGE: &str = "Usage:
+# process library.json
+ $ cover json path/to/library.json
+# fetch artists from musicbrainz
+ $ cover fetch 'Taylor Swift' 'black midi'";
+
+#[tokio::main]
+async fn main() {
+    let mut args = Arguments::from_env();
+    let library = match args.subcommand().unwrap().as_deref() {
+        Some("json") => {
+            let file_path = args
+                .finish()
+                .into_iter()
+                .next()
+                .unwrap()
+                .into_string()
+                .unwrap();
+            let json = fs::read_to_string(file_path).expect("Failed to open library file");
+            DeJson::deserialize_json(&json).expect("Failed to deserialize library file")
+        }
+        Some("fetch") => fetch_library(args.finish().into_iter().flat_map(|s| s.into_string()))
+            .await
+            .unwrap(),
+        _ => {
+            eprintln!("{USAGE}");
+            exit(1);
+        }
+    };
     for cover in library.library_covers() {
         println!("Found cover!");
         println!(