basic listener

.gitattributes

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+* text=auto eol=lf

.gitignore

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+# This file is for zig-specific build artifacts.
+# If you have OS-specific or editor-specific files to ignore,
+# such as *.swp or .DS_Store, put those in your global
+# ~/.gitignore and put this in your ~/.gitconfig:
+#
+# [core]
+#     excludesfile = ~/.gitignore
+#
+# Cheers!
+# -andrewrk
+
+zig-cache/
+zig-out/
+/release/
+/debug/
+/build/
+/build-*/
+/docgen_tmp/

build.zig

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+const std = @import("std");
+
+pub fn build(b: *std.Build) void {
+    const target = b.standardTargetOptions(.{});
+    const optimize = b.standardOptimizeOption(.{});
+
+    const exe = b.addExecutable(.{
+        .name = "master",
+        .root_source_file = .{ .path = "src/main.zig" },
+        .target = target,
+        .optimize = optimize,
+    });
+    b.installArtifact(exe);
+
+    const run_cmd = b.addRunArtifact(exe);
+    run_cmd.step.dependOn(b.getInstallStep());
+    if (b.args) |args| {
+        run_cmd.addArgs(args);
+    }
+    const run_step = b.step("run", "Run the app");
+    run_step.dependOn(&run_cmd.step);
+
+    const exe_unit_tests = b.addTest(.{
+        .root_source_file = .{ .path = "src/main.zig" },
+        .target = target,
+        .optimize = optimize,
+    });
+
+    const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests);
+    const test_step = b.step("test", "Run unit tests");
+    test_step.dependOn(&run_exe_unit_tests.step);
+}

build.zig.zon

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+.{
+    .name = "master",
+    // This is a [Semantic Version](https://semver.org/).
+    // In a future version of Zig it will be used for package deduplication.
+    .version = "0.0.0",
+
+    // This field is optional.
+    // This is currently advisory only; Zig does not yet do anything
+    // with this value.
+    //.minimum_zig_version = "0.11.0",
+
+    // This field is optional.
+    // Each dependency must either provide a `url` and `hash`, or a `path`.
+    // `zig build --fetch` can be used to fetch all dependencies of a package, recursively.
+    // Once all dependencies are fetched, `zig build` no longer requires
+    // internet connectivity.
+    .dependencies = .{
+        // See `zig fetch --save <url>` for a command-line interface for adding dependencies.
+        //.example = .{
+        //    // When updating this field to a new URL, be sure to delete the corresponding
+        //    // `hash`, otherwise you are communicating that you expect to find the old hash at
+        //    // the new URL.
+        //    .url = "https://example.com/foo.tar.gz",
+        //
+        //    // This is computed from the file contents of the directory of files that is
+        //    // obtained after fetching `url` and applying the inclusion rules given by
+        //    // `paths`.
+        //    //
+        //    // This field is the source of truth; packages do not come from a `url`; they
+        //    // come from a `hash`. `url` is just one of many possible mirrors for how to
+        //    // obtain a package matching this `hash`.
+        //    //
+        //    // Uses the [multihash](https://multiformats.io/multihash/) format.
+        //    .hash = "...",
+        //
+        //    // When this is provided, the package is found in a directory relative to the
+        //    // build root. In this case the package's hash is irrelevant and therefore not
+        //    // computed. This field and `url` are mutually exclusive.
+        //    .path = "foo",
+        //},
+    },
+
+    // Specifies the set of files and directories that are included in this package.
+    // Only files and directories listed here are included in the `hash` that
+    // is computed for this package.
+    // Paths are relative to the build root. Use the empty string (`""`) to refer to
+    // the build root itself.
+    // A directory listed here means that all files within, recursively, are included.
+    .paths = .{
+        // This makes *all* files, recursively, included in this package. It is generally
+        // better to explicitly list the files and directories instead, to insure that
+        // fetching from tarballs, file system paths, and version control all result
+        // in the same contents hash.
+        "",
+        // For example...
+        //"build.zig",
+        //"build.zig.zon",
+        //"src",
+        //"LICENSE",
+        //"README.md",
+    },
+}

flake.nix

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+{
+  description = "Zig project flake";
+
+  inputs = {
+    zig2nix.url = "github:Cloudef/zig2nix";
+  };
+
+  outputs = { zig2nix, ... }: let
+    flake-utils = zig2nix.inputs.flake-utils;
+  in (flake-utils.lib.eachDefaultSystem (system: let
+      # Zig flake helper
+      # Check the flake.nix in zig2nix project for more options:
+      # <https://github.com/Cloudef/zig2nix/blob/master/flake.nix>
+      env = zig2nix.outputs.zig-env.${system} { zig = zig2nix.outputs.packages.${system}.zig.master.bin; };
+      system-triple = env.lib.zigTripleFromString system;
+    in with builtins; with env.lib; with env.pkgs.lib; rec {
+      # nix build .#target.{zig-target}
+      # e.g. nix build .#target.x86_64-linux-gnu
+      packages.target = genAttrs allTargetTriples (target: env.packageForTarget target ({
+        src = cleanSource ./.;
+
+        nativeBuildInputs = with env.pkgs; [];
+        buildInputs = with env.pkgsForTarget target; [];
+
+        # Smaller binaries and avoids shipping glibc.
+        zigPreferMusl = true;
+
+        # This disables LD_LIBRARY_PATH mangling, binary patching etc...
+        # The package won't be usable inside nix.
+        zigDisableWrap = true;
+      } // optionalAttrs (!pathExists ./build.zig.zon) {
+        pname = "my-zig-project";
+        version = "0.0.0";
+      }));
+
+      # nix build .
+      packages.default = packages.target.${system-triple}.override {
+        # Prefer nix friendly settings.
+        zigPreferMusl = false;
+        zigDisableWrap = false;
+      };
+
+      # For bundling with nix bundle for running outside of nix
+      # example: https://github.com/ralismark/nix-appimage
+      apps.bundle.target = genAttrs allTargetTriples (target: let
+        pkg = packages.target.${target};
+      in {
+        type = "app";
+        program = "${pkg}/bin/master";
+      });
+
+      # default bundle
+      apps.bundle.default = apps.bundle.target.${system-triple};
+
+      # nix run .
+      apps.default = env.app [] "zig build run -- \"$@\"";
+
+      # nix run .#build
+      apps.build = env.app [] "zig build \"$@\"";
+
+      # nix run .#test
+      apps.test = env.app [] "zig build test -- \"$@\"";
+
+      # nix run .#docs
+      apps.docs = env.app [] "zig build docs -- \"$@\"";
+
+      # nix run .#deps
+      apps.deps = env.showExternalDeps;
+
+      # nix run .#zon2json
+      apps.zon2json = env.app [env.zon2json] "zon2json \"$@\"";
+
+      # nix run .#zon2json-lock
+      apps.zon2json-lock = env.app [env.zon2json-lock] "zon2json-lock \"$@\"";
+
+      # nix run .#zon2nix
+      apps.zon2nix = env.app [env.zon2nix] "zon2nix \"$@\"";
+
+      # nix develop
+      devShells.default = env.mkShell {};
+    }));
+}

src/main.zig

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+const std = @import("std");
+const mem = std.mem;
+const net = std.net;
+const http = std.http;
+const heap = std.heap;
+
+pub fn main() !void {
+    var gpa = std.heap.GeneralPurposeAllocator(.{}){};
+    defer _ = gpa.deinit();
+    const allocator = gpa.allocator();
+
+    const address = try net.Address.parseIp("0.0.0.0", 8080);
+    var listener = Listener.init(address, allocator, &handler);
+    defer listener.deinit();
+    try listener.listen();
+}
+
+pub fn handler(event: *Listener.Event) anyerror!void {
+    try event.res.body.appendSlice("hello there");
+}
+
+pub const Router = struct {};
+
+pub const Listener = struct {
+    address: net.Address,
+    arena: heap.ArenaAllocator,
+    handler: *const fn (event: *Event) anyerror!void,
+
+    pub fn init(address: net.Address, allocator: mem.Allocator, hand: *const fn (event: *Event) anyerror!void) Listener {
+        return .{
+            .address = address,
+            .arena = heap.ArenaAllocator.init(allocator),
+            .handler = hand,
+        };
+    }
+
+    pub fn deinit(self: *Listener) void {
+        self.arena.deinit();
+    }
+
+    pub fn listen(self: *Listener) !void {
+        var tcp = try self.address.listen(.{});
+        defer tcp.deinit();
+        std.debug.print("listening at: {any}\n", .{self.address});
+
+        while (true) {
+            const read_buf = try self.arena.allocator().alloc(u8, 1024 * 32);
+            const connection = try tcp.accept();
+            var server = http.Server.init(connection, read_buf);
+            try self.handle(&server);
+            _ = self.arena.reset(.retain_capacity);
+        }
+    }
+
+    fn handle(self: *Listener, server: *http.Server) !void {
+        handler: while (true) {
+            var req = server.receiveHead() catch |e| if (e == error.HttpConnectionClosing) break :handler else return e;
+
+            var event = Event{
+                .req = .{
+                    .uri = try std.Uri.parseWithoutScheme(req.head.target),
+                    .headers = std.ArrayList(*const http.Header).init(self.arena.allocator()),
+                },
+                .res = .{
+                    .status = .ok,
+                    .headers = std.StringHashMap(*http.Header).init(self.arena.allocator()),
+                    .body = std.ArrayList(u8).init(self.arena.allocator()),
+                },
+            };
+
+            var header_it = req.iterateHeaders();
+            while (header_it.next()) |header| try event.req.headers.append(&header);
+
+            try self.handler(&event);
+
+            try self.respondFromEvent(&event, &req);
+        }
+    }
+
+    fn respondFromEvent(self: *Listener, event: *Event, req: *http.Server.Request) !void {
+        const res_body = try event.res.body.toOwnedSlice();
+        const res_headers = try self.arena.allocator().alloc(http.Header, event.res.headers.count());
+        var i: usize = 0;
+        var header_it = event.res.headers.iterator();
+        while (header_it.next()) |header_ptr| : (i += 1) res_headers[i] = header_ptr.value_ptr.*.*;
+        try req.respond(res_body, .{
+            .status = event.res.status,
+            .extra_headers = res_headers,
+        });
+    }
+
+    pub const Event = struct {
+        req: Request,
+        res: Response,
+
+        pub const Request = struct {
+            uri: std.Uri,
+            // head: http.Server.Request.Head,
+            headers: std.ArrayList(*const http.Header),
+        };
+        pub const Response = struct {
+            status: http.Status,
+            headers: std.StringHashMap(*http.Header),
+            body: std.ArrayList(u8),
+        };
+    };
+};