init with crane workspace flake template

.cargo/audit.toml

···
+# Doesn't work in the sandbox
+[yanked]
+enabled = false      # Warn for yanked crates in Cargo.lock (default: true)
+update_index = false # Auto-update the crates.io index (default: true)

.config/hakari.toml

···
+# This file contains settings for `cargo hakari`.
+# See https://docs.rs/cargo-hakari/latest/cargo_hakari/config for a full list of options.
+
+hakari-package = "my-workspace-hack"
+
+# Format version for hakari's output. Version 4 requires cargo-hakari 0.9.22 or above.
+dep-format-version = "4"
+
+# Setting workspace.resolver = "2" in the root Cargo.toml is HIGHLY recommended.
+# Hakari works much better with the new feature resolver.
+# For more about the new feature resolver, see:
+# https://blog.rust-lang.org/2021/03/25/Rust-1.51.0.html#cargos-new-feature-resolver
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+
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+  # "x86_64-apple-darwin",
+  # "x86_64-pc-windows-msvc",
+]
+
+# Write out exact versions rather than a semver range. (Defaults to false.)
+# exact-versions = true

.gitignore

···
+/target
+result*
+
+.direnv
+.env
+.devenv

Cargo.lock

···
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+checksum = "6e06d43f1345a3bcd39f6a56dbb7dcab2ba47e68e8ac134855e7e2bdbaf8cab8"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
+[[package]]
+name = "tower"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d039ad9159c98b70ecfd540b2573b97f7f52c3e8d9f8ad57a24b916a536975f9"
+dependencies = [
+ "futures-core",
+ "futures-util",
+ "pin-project-lite",
+ "sync_wrapper",
+ "tokio",
+ "tower-layer",
+ "tower-service",
+ "tracing",
+]
+
+[[package]]
+name = "tower-layer"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "121c2a6cda46980bb0fcd1647ffaf6cd3fc79a013de288782836f6df9c48780e"
+
+[[package]]
+name = "tower-service"
+version = "0.3.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8df9b6e13f2d32c91b9bd719c00d1958837bc7dec474d94952798cc8e69eeec3"
+
+[[package]]
+name = "tracing"
+version = "0.1.41"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "784e0ac535deb450455cbfa28a6f0df145ea1bb7ae51b821cf5e7927fdcfbdd0"
+dependencies = [
+ "log",
+ "pin-project-lite",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-core"
+version = "0.1.33"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e672c95779cf947c5311f83787af4fa8fffd12fb27e4993211a84bdfd9610f9c"
+dependencies = [
+ "once_cell",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "adb9e6ca4f869e1180728b7950e35922a7fc6397f7b641499e8f3ef06e50dc83"
+
+[[package]]
+name = "wasi"
+version = "0.11.0+wasi-snapshot-preview1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9c8d87e72b64a3b4db28d11ce29237c246188f4f51057d65a7eab63b7987e423"
+
+[[package]]
+name = "windows-sys"
+version = "0.52.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "282be5f36a8ce781fad8c8ae18fa3f9beff57ec1b52cb3de0789201425d9a33d"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"

Cargo.toml

···
+[workspace]
+resolver = "2"
+# Note that we define member crates with a wildcard here and NOT with explicit
+# paths because the flake.nix is written in a way such that top-level members
+# (`my-cli` and `my-server`) are built as different derivations which avoid being
+# rebuilt if the other package's sources change.
+members = ["crates/*"]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2021"
+
+[workspace.metadata.crane]
+name = "atpblog-workspace"

crates/atpblog-cli/Cargo.toml

···
+[package]
+name = "atpblog-cli"
+version.workspace = true
+edition.workspace = true
+publish = false
+
+[dependencies]
+atpblog-common = { path = "../atpblog-common" }
+atpblog-workspace-hack = { version = "0.1", path = "../atpblog-workspace-hack" }
+tokio = { version = "1", features = ["rt-multi-thread", "macros"] }

crates/atpblog-cli/src/main.rs

···
+//! A cli which will echo every input argument to stdout
+
+#[tokio::main]
+async fn main() {
+    let (tx, mut rx, fut) = my_common::echo_task(10, "echo".into());
+    let args = std::env::args().skip(1).collect::<Vec<_>>();
+
+    tokio::spawn(fut);
+    tokio::spawn(async move {
+        for arg in args {
+            if tx.send(arg.into()).await.is_err() {
+                eprintln!("channel was unexpectedly closed");
+                break;
+            }
+        }
+    });
+
+    while let Some(msg) = rx.recv().await {
+        println!("{msg}");
+    }
+}

crates/atpblog-common/Cargo.toml

···
+[package]
+name = "atpblog-common"
+version.workspace = true
+edition.workspace = true
+publish = false
+
+[dependencies]
+atpblog-workspace-hack = { version = "0.1", path = "../atpblog-workspace-hack" }
+tokio = { version = "1", features = ["sync"] }
+
+[dev-dependencies]
+tokio = { version = "1", features = ["macros", "rt"] }

crates/atpblog-common/src/lib.rs

···
+use std::{borrow::Cow, future::Future};
+use tokio::sync::mpsc;
+
+/// Echoes messages back with the given prefix
+pub fn echo_task(
+    buffer: usize,
+    prefix: Cow<'static, str>,
+) -> (
+    mpsc::Sender<Cow<'static, str>>,
+    mpsc::Receiver<String>,
+    impl Future<Output = ()>,
+) {
+    let (in_tx, mut in_rx) = mpsc::channel(buffer);
+    let (out_tx, out_rx) = mpsc::channel(buffer);
+
+    (in_tx, out_rx, async move {
+        while let Some(msg) = in_rx.recv().await {
+            let msg = format!("{prefix} {msg}");
+            if out_tx.send(msg).await.is_err() {
+                break;
+            }
+        }
+    })
+}
+
+#[cfg(test)]
+mod test {
+    use super::echo_task;
+
+    #[tokio::test]
+    async fn smoke() {
+        let (tx, mut rx, fut) = echo_task(10, "hello".into());
+
+        tokio::spawn(fut);
+
+        tx.send("world".into()).await.unwrap();
+        assert_eq!("hello world", rx.recv().await.unwrap());
+
+        tx.send("someone".into()).await.unwrap();
+        assert_eq!("hello someone", rx.recv().await.unwrap());
+    }
+}

crates/atpblog-renderer/Cargo.toml

···
+[package]
+name = "atpblog-renderer"
+version.workspace = true
+edition.workspace = true
+
+[dependencies]

crates/atpblog-renderer/src/main.rs

···
+fn main() {
+    println!("Hello, world!");
+}

crates/atpblog-server/Cargo.toml

···
+[package]
+name = "atpblog-server"
+version.workspace = true
+edition.workspace = true
+publish = false
+
+[dependencies]
+atpblog-common = { path = "../atpblog-common" }
+atpblog-workspace-hack = { version = "0.1", path = "../atpblog-workspace-hack" }
+axum = "0.7.5"
+tokio = { version = "1.43", features = ["full"] }

crates/atpblog-server/src/main.rs

···
+//! An HTTP server which will echo back query params sent to /ping
+
+use axum::{extract::Query, response::Html, routing::get, Router};
+use std::collections::HashMap;
+
+#[tokio::main]
+async fn main() {
+    let app = Router::new()
+        .route("/", get(handler))
+        .route("/ping", get(ping));
+
+    let listener = tokio::net::TcpListener::bind("127.0.0.1:3000")
+        .await
+        .unwrap();
+    println!("listening on {}", listener.local_addr().unwrap());
+    axum::serve(listener, app).await.unwrap();
+}
+
+async fn handler() -> Html<&'static str> {
+    Html("<h1>Hello, World!</h1>")
+}
+
+async fn ping(Query(params): Query<HashMap<String, String>>) -> Html<String> {
+    let (tx, mut rx, fut) = my_common::echo_task(10, "ping".into());
+    tokio::spawn(fut);
+    tokio::spawn(async move {
+        for (k, v) in params {
+            if tx.send(format!("{k}: {v}").into()).await.is_err() {
+                break;
+            }
+        }
+    });
+
+    let mut body = String::from("<pre>");
+
+    while let Some(msg) = rx.recv().await {
+        body.push_str(&msg);
+    }
+
+    body.push_str("</pre>");
+    Html(body)
+}

crates/atpblog-workspace-hack/.gitattributes

···
+# Avoid putting conflict markers in the generated Cargo.toml file, since their presence breaks
+# Cargo.
+# Also do not check out the file as CRLF on Windows, as that's what hakari needs.
+Cargo.toml merge=binary -crlf

crates/atpblog-workspace-hack/Cargo.toml

···
+# This file is generated by `cargo hakari`.
+# To regenerate, run:
+#     cargo hakari generate
+
+[package]
+name = "atpblog-workspace-hack"
+version = "0.1.0"
+description = "workspace-hack package, managed by hakari"
+# You can choose to publish this crate: see https://docs.rs/cargo-hakari/latest/cargo_hakari/publishing.
+publish = false
+
+# The parts of the file between the BEGIN HAKARI SECTION and END HAKARI SECTION comments
+# are managed by hakari.
+
+### BEGIN HAKARI SECTION
+[dependencies]
+smallvec = { version = "1", default-features = false, features = ["const_new"] }
+tokio = { version = "1", features = ["full"] }
+
+[build-dependencies]
+proc-macro2 = { version = "1" }
+quote = { version = "1" }
+syn = { version = "2", features = ["full", "visit-mut"] }
+
+### END HAKARI SECTION

crates/atpblog-workspace-hack/build.rs

···
+// A build script is required for cargo to consider build dependencies.
+fn main() {}

crates/atpblog-workspace-hack/src/lib.rs

···
+// This is a stub lib.rs.

deny.toml

···
+[bans]
+multiple-versions = 'allow'
+
+[licenses]
+private = { ignore = true }
+allow = ["Apache-2.0", "BSD-3-Clause", "MIT", "Unicode-3.0"]

flake.nix

···
+{
+  description = "Build a cargo workspace";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+
+    crane.url = "github:ipetkov/crane";
+
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+      inputs.rust-analyzer-src.follows = "";
+    };
+
+    flake-utils.url = "github:numtide/flake-utils";
+
+    advisory-db = {
+      url = "github:rustsec/advisory-db";
+      flake = false;
+    };
+  };
+
+  outputs = { self, nixpkgs, crane, fenix, flake-utils, advisory-db, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+
+        inherit (pkgs) lib;
+
+        craneLib = crane.mkLib pkgs;
+        src = craneLib.cleanCargoSource ./.;
+
+        # Common arguments can be set here to avoid repeating them later
+        commonArgs = {
+          inherit src;
+          strictDeps = true;
+
+          buildInputs = [
+            # Add additional build inputs here
+          ] ++ lib.optionals pkgs.stdenv.isDarwin [
+            # Additional darwin specific inputs can be set here
+            pkgs.libiconv
+          ];
+
+          # Additional environment variables can be set directly
+          # MY_CUSTOM_VAR = "some value";
+        };
+
+        craneLibLLvmTools = craneLib.overrideToolchain
+          (fenix.packages.${system}.complete.withComponents [
+            "cargo"
+            "llvm-tools"
+            "rustc"
+          ]);
+
+        # Build *just* the cargo dependencies (of the entire workspace),
+        # so we can reuse all of that work (e.g. via cachix) when running in CI
+        # It is *highly* recommended to use something like cargo-hakari to avoid
+        # cache misses when building individual top-level-crates
+        cargoArtifacts = craneLib.buildDepsOnly commonArgs;
+
+        individualCrateArgs = commonArgs // {
+          inherit cargoArtifacts;
+          inherit (craneLib.crateNameFromCargoToml { inherit src; }) version;
+          # NB: we disable tests since we'll run them all via cargo-nextest
+          doCheck = false;
+        };
+
+        fileSetForCrate = crate: lib.fileset.toSource {
+          root = ./.;
+          fileset = lib.fileset.unions [
+            ./Cargo.toml
+            ./Cargo.lock
+            (craneLib.fileset.commonCargoSources ./crates/my-common)
+            (craneLib.fileset.commonCargoSources ./crates/my-workspace-hack)
+            (craneLib.fileset.commonCargoSources crate)
+          ];
+        };
+
+        # Build the top-level crates of the workspace as individual derivations.
+        # This allows consumers to only depend on (and build) only what they need.
+        # Though it is possible to build the entire workspace as a single derivation,
+        # so this is left up to you on how to organize things
+        #
+        # Note that the cargo workspace must define `workspace.members` using wildcards,
+        # otherwise, omitting a crate (like we do below) will result in errors since
+        # cargo won't be able to find the sources for all members.
+        atpblog-cli = craneLib.buildPackage (individualCrateArgs // {
+          pname = "my-cli";
+          cargoExtraArgs = "-p my-cli";
+          src = fileSetForCrate ./crates/my-cli;
+        });
+        atpblog-server = craneLib.buildPackage (individualCrateArgs // {
+          pname = "my-server";
+          cargoExtraArgs = "-p my-server";
+          src = fileSetForCrate ./crates/my-server;
+        });
+      in
+      {
+        checks = {
+          # Build the crates as part of `nix flake check` for convenience
+          inherit atpblog-cli atpblog-server;
+
+          # Run clippy (and deny all warnings) on the workspace source,
+          # again, reusing the dependency artifacts from above.
+          #
+          # Note that this is done as a separate derivation so that
+          # we can block the CI if there are issues here, but not
+          # prevent downstream consumers from building our crate by itself.
+          atpblog-workspace-clippy = craneLib.cargoClippy (commonArgs // {
+            inherit cargoArtifacts;
+            cargoClippyExtraArgs = "--all-targets -- --deny warnings";
+          });
+
+          atpblog-workspace-doc = craneLib.cargoDoc (commonArgs // {
+            inherit cargoArtifacts;
+          });
+
+          # Check formatting
+          atpblog-workspace-fmt = craneLib.cargoFmt {
+            inherit src;
+          };
+
+          atpblog-workspace-toml-fmt = craneLib.taploFmt {
+            src = pkgs.lib.sources.sourceFilesBySuffices src [ ".toml" ];
+            # taplo arguments can be further customized below as needed
+            # taploExtraArgs = "--config ./taplo.toml";
+          };
+
+          # Audit dependencies
+          atpblog-workspace-audit = craneLib.cargoAudit {
+            inherit src advisory-db;
+          };
+
+          # Audit licenses
+          atpblog-workspace-deny = craneLib.cargoDeny {
+            inherit src;
+          };
+
+          # Run tests with cargo-nextest
+          # Consider setting `doCheck = false` on other crate derivations
+          # if you do not want the tests to run twice
+          atpblog-workspace-nextest = craneLib.cargoNextest (commonArgs // {
+            inherit cargoArtifacts;
+            partitions = 1;
+            partitionType = "count";
+            cargoNextestPartitionsExtraArgs = "--no-tests=pass";
+          });
+
+          # Ensure that cargo-hakari is up to date
+          atpblog-workspace-hakari = craneLib.mkCargoDerivation {
+            inherit src;
+            pname = "atpblog-workspace-hakari";
+            cargoArtifacts = null;
+            doInstallCargoArtifacts = false;
+
+            buildPhaseCargoCommand = ''
+              cargo hakari generate --diff  # workspace-hack Cargo.toml is up-to-date
+              cargo hakari manage-deps --dry-run  # all workspace crates depend on workspace-hack
+              cargo hakari verify
+            '';
+
+            nativeBuildInputs = [
+              pkgs.cargo-hakari
+            ];
+          };
+        };
+
+        packages = {
+          inherit atpblog-cli atpblog-server;
+        } // lib.optionalAttrs (!pkgs.stdenv.isDarwin) {
+          atpblog-workspace-llvm-coverage = craneLibLLvmTools.cargoLlvmCov (commonArgs // {
+            inherit cargoArtifacts;
+          });
+        };
+
+        apps = {
+          atpblog-cli = flake-utils.lib.mkApp {
+            drv = atpblog-cli;
+          };
+          atpblog-server = flake-utils.lib.mkApp {
+            drv = atpblog-server;
+          };
+        };
+
+        devShells.default = craneLib.devShell {
+          # Inherit inputs from checks.
+          checks = self.checks.${system};
+
+          # Additional dev-shell environment variables can be set directly
+          # MY_CUSTOM_DEVELOPMENT_VAR = "something else";
+
+          # Extra inputs can be added here; cargo and rustc are provided by default.
+          packages = [
+            pkgs.cargo-hakari
+          ];
+        };
+      });
+}

taplo.toml

···
+# Sorts `Cargo.toml` dependencies. All other `.toml` files are formatted with the default config.
+#
+# https://taplo.tamasfe.dev/configuration/file.html#configuration-file
+
+[formatting]
+reorder_keys = false
+
+[[rule]]
+include = ["**/Cargo.toml"]
+keys = ["dependencies"]
+
+[rule.formatting]
+reorder_keys = true