111 lines
3.4 KiB
Markdown
111 lines
3.4 KiB
Markdown
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date = "2022-08-02"
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tags = ["zig","cloudflare"]
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title = "zigをwasmにしてcloudflareにdeployする"
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slug = "zig-wasm-cloudflare"
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+++
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`zig`はprogramming-langの一つです。rustに似ていますが、c++寄りだと思います。
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zigの利点はなんといってもwasmへのbuildの手軽さだと思います。
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wasmはwebから実行できるbinaryです。
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今後、webなどでもzigが採用されるケースが増えてくるかもしれません。
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```sh
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$ brew install zig
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$ mkdir zig-first-project
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$ cd zig-first-project
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$ zig init-exe
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$ cat src/main.zig
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$ cat build.zig
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$ zig build
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$ ./zig-out/bin/zig-first-project
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```
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hello-worldしてみます。
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```zig:src/main.zig
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const std = @import("std");
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pub fn main() anyerror!void {
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const stdout = std.io.getStdOut().writer();
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try stdout.print("hello, world!\n", .{});
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}
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```
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ここまでで[ziglang/zig.vim](https://github.com/ziglang/zig.vim)を入れておいたほうがいいでしょう。zigはコード内にある`\t`の扱いが特殊です。
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```vim
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Plug 'ziglang/zig.vim'
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```
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以下はcloudflare [blog](https://blog.cloudflare.com/running-zig-with-wasi-on-cloudflare-workers/)にあるexampleです。
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```zig:src/main.zig
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const std = @import("std");
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pub fn main() anyerror!void {
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// setup allocator
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var gpa = std.heap.GeneralPurposeAllocator(.{}){};
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defer std.debug.assert(!gpa.deinit());
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const allocator = gpa.allocator();
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// setup streams
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const stdout = std.io.getStdOut().writer();
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const in = std.io.getStdIn();
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var reader = std.io.bufferedReader(in.reader()).reader();
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var counter: u32 = 1;
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// read input line by line
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while (try reader.readUntilDelimiterOrEofAlloc(allocator, '\n', std.math.maxInt(usize))) |line| {
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defer allocator.free(line);
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try stdout.print("{d}\t{s}\n", .{counter, line});
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counter = counter + 1;
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}
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}
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```
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単純に文字を渡すと行番号を追加して返します。
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> just read some text from stdin and print it to stdout with line numbers, like running cat -n. But it does show just how easy the Workers paradigm is. This Zig program works identically on the command-line on my laptop and as an HTTP API deployed on Cloudflare Workers.
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```zig:build.zig
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const std = @import("std");
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pub fn build(b: *std.build.Builder) void {
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const target = b.standardTargetOptions(.{});
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const mode = b.standardReleaseOptions();
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const exe = b.addExecutable("zig-first-project", "src/main.zig");
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exe.setTarget(target);
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exe.setBuildMode(mode);
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exe.install();
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}
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```
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cloudflare workersではwasiがsupportされています。wasm-build, workers-deployまでをやってみます。
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```sh
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$ zig build -Dtarget=wasm32-wasi
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$ ls zig-out/bin/*.wasm
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$ echo "Hello\nWorld" | wasmtime ./zig-out/bin/zig-first-project.wasm
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1 Hello
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2 World
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$ npx wrangler@wasm login
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$ npx wrangler@wasm publish --name print-with-line-numbers --compatibility-date=2022-07-07 ./zig-out/bin/zig-first-project.wasm
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```
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これでdeployは完了です。取得されたworkersのaddressに文字列をpostしてみましょう。wasm-binaryが実行され、反応を返します。
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```sh
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$ echo "hello\nworld" | curl https://print-with-line-numbers.$USER.workers.dev -X POST --data-binary @-
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1 hello
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2 world
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```
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このようにめちゃくちゃ便利なcloudflare workersですが、cloudflareが提供する`workers.dev`のidは開発者なら取っておいたほうがよさそうです。
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