diff --git a/http_server/build.zig b/http_server/build.zig new file mode 100644 index 0000000..2c88e7a --- /dev/null +++ b/http_server/build.zig @@ -0,0 +1,75 @@ +const std = @import("std"); + +// Although this function looks imperative, note that its job is to +// declaratively construct a build graph that will be executed by an external +// runner. +pub fn build(b: *std.Build) void { + // Standard target options allows the person running `zig build` to choose + // what target to build for. Here we do not override the defaults, which + // means any target is allowed, and the default is native. Other options + // for restricting supported target set are available. + const target = b.standardTargetOptions(.{}); + + // Standard optimization options allow the person running `zig build` to select + // between Debug, ReleaseSafe, ReleaseFast, and ReleaseSmall. Here we do not + // set a preferred release mode, allowing the user to decide how to optimize. + const optimize = b.standardOptimizeOption(.{}); + + // We will also create a module for our other entry point, 'main.zig'. + const exe_mod = b.createModule(.{ + // `root_source_file` is the Zig "entry point" of the module. If a module + // only contains e.g. external object files, you can make this `null`. + // In this case the main source file is merely a path, however, in more + // complicated build scripts, this could be a generated file. + .root_source_file = b.path("src/main.zig"), + .target = target, + .optimize = optimize, + }); + + // This creates another `std.Build.Step.Compile`, but this one builds an executable + // rather than a static library. + const exe = b.addExecutable(.{ + .name = "http_server", + .root_module = exe_mod, + }); + + // This declares intent for the executable to be installed into the + // standard location when the user invokes the "install" step (the default + // step when running `zig build`). + b.installArtifact(exe); + + // This *creates* a Run step in the build graph, to be executed when another + // step is evaluated that depends on it. The next line below will establish + // such a dependency. + const run_cmd = b.addRunArtifact(exe); + + // By making the run step depend on the install step, it will be run from the + // installation directory rather than directly from within the cache directory. + // This is not necessary, however, if the application depends on other installed + // files, this ensures they will be present and in the expected location. + run_cmd.step.dependOn(b.getInstallStep()); + + // This allows the user to pass arguments to the application in the build + // command itself, like this: `zig build run -- arg1 arg2 etc` + if (b.args) |args| { + run_cmd.addArgs(args); + } + + // This creates a build step. It will be visible in the `zig build --help` menu, + // and can be selected like this: `zig build run` + // This will evaluate the `run` step rather than the default, which is "install". + const run_step = b.step("run", "Run the app"); + run_step.dependOn(&run_cmd.step); + + const exe_unit_tests = b.addTest(.{ + .root_module = exe_mod, + }); + + const run_exe_unit_tests = b.addRunArtifact(exe_unit_tests); + + // Similar to creating the run step earlier, this exposes a `test` step to + // the `zig build --help` menu, providing a way for the user to request + // running the unit tests. + const test_step = b.step("test", "Run unit tests"); + test_step.dependOn(&run_exe_unit_tests.step); +} diff --git a/http_server/build.zig.zon b/http_server/build.zig.zon new file mode 100644 index 0000000..1e85e10 --- /dev/null +++ b/http_server/build.zig.zon @@ -0,0 +1,86 @@ +.{ + // This is the default name used by packages depending on this one. For + // example, when a user runs `zig fetch --save `, this field is used + // as the key in the `dependencies` table. Although the user can choose a + // different name, most users will stick with this provided value. + // + // It is redundant to include "zig" in this name because it is already + // within the Zig package namespace. + .name = .http_server, + + // 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", + + // Together with name, this represents a globally unique package + // identifier. This field is generated by the Zig toolchain when the + // package is first created, and then *never changes*. This allows + // unambiguous detection of one package being an updated version of + // another. + // + // When forking a Zig project, this id should be regenerated (delete the + // field and run `zig build`) if the upstream project is still maintained. + // Otherwise, the fork is *hostile*, attempting to take control over the + // original project's identity. Thus it is recommended to leave the comment + // on the following line intact, so that it shows up in code reviews that + // modify the field. + .fingerprint = 0x411f0d318fc38a3a, // Changing this has security and trust implications. + + // Tracks the earliest Zig version that the package considers to be a + // supported use case. + .minimum_zig_version = "0.14.1", + + // 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 ` 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. If the contents of a URL change this will result in a hash mismatch + // // which will prevent zig from using it. + // .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", + // + // // When this is set to `true`, a package is declared to be lazily + // // fetched. This makes the dependency only get fetched if it is + // // actually used. + // .lazy = false, + //}, + }, + + // 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. Only files listed here will remain on disk + // when using the zig package manager. As a rule of thumb, one should list + // files required for compilation plus any license(s). + // 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 = .{ + "build.zig", + "build.zig.zon", + "src", + // For example... + //"LICENSE", + //"README.md", + }, +} diff --git a/http_server/src/config.zig b/http_server/src/config.zig new file mode 100644 index 0000000..50ac389 --- /dev/null +++ b/http_server/src/config.zig @@ -0,0 +1,19 @@ +const std = @import("std"); + +pub const Socket = struct { + _address: std.net.Address, + _stream: std.net.Stream, + + pub fn init() !Socket { + const host = [4]u8{127, 0, 0, 1}; + const port = 1987; + const addr = std.net.Address.initIp4(host, port); + const socket = try std.posix.socket( + addr.any.family, + std.posix.SOCK.STREAM, + std.posix.IPPROTO.TCP, + ); + const stream = std.net.Stream{ .handle = socket }; + return Socket{ ._address = addr, ._stream = stream }; + } +}; diff --git a/http_server/src/main.zig b/http_server/src/main.zig new file mode 100644 index 0000000..f041cf1 --- /dev/null +++ b/http_server/src/main.zig @@ -0,0 +1,26 @@ +const std = @import("std"); +const SocketConf = @import("config.zig"); +const Request = @import("request.zig"); +const Method = Request.Method; +const Response = @import("response.zig"); + +pub fn main() !void { + const stdout = std.io.getStdOut().writer(); + const socket = try SocketConf.Socket.init(); + try stdout.print("Server address: {any}\n", .{socket._address}); + var server = try socket._address.listen(.{}); + const connection = try server.accept(); + var buffer: [1000]u8 = undefined; + for (0..buffer.len) |i| { + buffer[i] = 0; + } + _ = try Request.read_request(connection, buffer[0..buffer.len]); + const request = Request.parse_request(&buffer); + if (request.method == Method.GET) { + if (std.mem.eql(u8, request.uri, "/")) { + try Response.send_200(connection); + } else { + try Response.send_404(connection); + } + } +} diff --git a/http_server/src/request.zig b/http_server/src/request.zig new file mode 100644 index 0000000..d292109 --- /dev/null +++ b/http_server/src/request.zig @@ -0,0 +1,51 @@ +const std = @import("std"); +const Connection = std.net.Server.Connection; +const Map = std.static_string_map.StaticStringMap; + +pub const Method = enum { + GET, + + pub fn init(method: [] const u8) !Method { + return MethodMap.get(method).?; + } + + pub fn is_supported(method: [] const u8) bool { + const m = MethodMap.get(method); + + if (m) |_| { + return true; + } + + return false; + } +}; + +const MethodMap = Map(Method).initComptime(.{ + .{"GET", Method.GET}, +}); + +pub const Request = struct { + method: Method, + version: [] const u8, + uri: [] const u8, + + pub fn init(method: Method, version: [] const u8, uri: [] const u8) Request { + return Request{.method = method, .version = version, .uri = uri}; + } +}; + +pub fn read_request(connection: Connection, buffer: []u8) !void { + const reader = connection.stream.reader(); + _ = try reader.read(buffer); +} + +pub fn parse_request(text: [] u8) Request { + const line_index = std.mem.indexOfScalar(u8, text, '\n') orelse text.len; + var iterator = std.mem.splitScalar(u8, text[0..line_index], ' '); + const method = try Method.init(iterator.next().?); + const uri = iterator.next().?; + const version = iterator.next().?; + const request = Request.init(method, version, uri); + + return request; +} diff --git a/http_server/src/response.zig b/http_server/src/response.zig new file mode 100644 index 0000000..6df01c9 --- /dev/null +++ b/http_server/src/response.zig @@ -0,0 +1,24 @@ +const std = @import("std"); +const Connection = std.net.Server.Connection; + +pub fn send_200(connection: Connection) !void { + const message = ( + "HTTP/1.1 200 OK\nContent-Length: 48" + ++ "\nContent-Type: text/html\n" + ++ "Connection: Closed\n\n" + ++ "

Hello, World!

" + ); + + _ = try connection.stream.write(message); +} + +pub fn send_404(connection: Connection) !void { + const message = ( + "HTTP/1.1 404 Not Found\nContent-Length: 50" + ++ "\nContent-Type: text/html\n" + ++ "Connection: Closed\n\n" + ++ "

File not found!

" + ); + + _ = try connection.stream.write(message); +}