From 778456807ed795cf137ef2a510e75acc0b6aa657 Mon Sep 17 00:00:00 2001
From: aki-0421 <118268728+aki-0421@users.noreply.github.com>
Date: Sun, 2 Apr 2023 20:12:24 +0900
Subject: [PATCH] F: add fetch example (wip)

---
 examples/fetch/.gitignore    |  1 +
 examples/fetch/Makefile      | 12 ++++++++++++
 examples/fetch/README.md     | 21 +++++++++++++++++++++
 examples/fetch/go.mod        |  7 +++++++
 examples/fetch/go.sum        |  2 ++
 examples/fetch/main.go       | 35 +++++++++++++++++++++++++++++++++++
 examples/fetch/worker.mjs    | 22 ++++++++++++++++++++++
 examples/fetch/wrangler.toml |  6 ++++++
 8 files changed, 106 insertions(+)
 create mode 100644 examples/fetch/.gitignore
 create mode 100644 examples/fetch/Makefile
 create mode 100644 examples/fetch/README.md
 create mode 100644 examples/fetch/go.mod
 create mode 100644 examples/fetch/go.sum
 create mode 100644 examples/fetch/main.go
 create mode 100644 examples/fetch/worker.mjs
 create mode 100644 examples/fetch/wrangler.toml

diff --git a/examples/fetch/.gitignore b/examples/fetch/.gitignore
new file mode 100644
index 0000000..53c37a1
--- /dev/null
+++ b/examples/fetch/.gitignore
@@ -0,0 +1 @@
+dist
\ No newline at end of file
diff --git a/examples/fetch/Makefile b/examples/fetch/Makefile
new file mode 100644
index 0000000..320ddc3
--- /dev/null
+++ b/examples/fetch/Makefile
@@ -0,0 +1,12 @@
+.PHONY: dev
+dev:
+	wrangler dev
+
+.PHONY: build
+build:
+	mkdir -p dist
+	tinygo build -o ./dist/app.wasm -target wasm ./...
+
+.PHONY: publish
+publish:
+	wrangler publish
diff --git a/examples/fetch/README.md b/examples/fetch/README.md
new file mode 100644
index 0000000..d1e520d
--- /dev/null
+++ b/examples/fetch/README.md
@@ -0,0 +1,21 @@
+# hello
+
+* This app just returns a message `Hello, world!`.
+* If a url param like `?name=syumai` given, then a message `Hello, syumai!` will be returned.
+
+## Development
+
+### Requirements
+
+This project requires these tools to be installed globally.
+
+* wrangler
+* tinygo
+
+### Commands
+
+```
+make dev     # run dev server
+make build   # build Go Wasm binary
+make publish # publish worker
+```
\ No newline at end of file
diff --git a/examples/fetch/go.mod b/examples/fetch/go.mod
new file mode 100644
index 0000000..eb5269f
--- /dev/null
+++ b/examples/fetch/go.mod
@@ -0,0 +1,7 @@
+module github.com/syumai/fetch
+
+go 1.18
+
+require github.com/syumai/workers v0.0.0
+
+replace github.com/syumai/workers => ../../
\ No newline at end of file
diff --git a/examples/fetch/go.sum b/examples/fetch/go.sum
new file mode 100644
index 0000000..8c27871
--- /dev/null
+++ b/examples/fetch/go.sum
@@ -0,0 +1,2 @@
+github.com/syumai/workers v0.1.0 h1:z5QfQR2X+PCKzom7RodpI5J4D5YF7NT7Qwzb9AM9dgY=
+github.com/syumai/workers v0.1.0/go.mod h1:alXIDhTyeTwSzh0ZgQ3cb9HQPyyYfIejupE4Z3efr14=
diff --git a/examples/fetch/main.go b/examples/fetch/main.go
new file mode 100644
index 0000000..bddf7d3
--- /dev/null
+++ b/examples/fetch/main.go
@@ -0,0 +1,35 @@
+package main
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+
+	"github.com/syumai/workers"
+	"github.com/syumai/workers/cloudflare/fetch"
+)
+
+func main() {
+	handler := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
+		f := fetch.NewClient()
+
+		r, err := fetch.NewRequest(req.Context(), http.MethodGet, "https://api.github.com/repos/syumai/workers/releases", nil)
+		if err != nil {
+			fmt.Println(err)
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+		r.Header.Set("User-Agent", "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/111.0")
+
+		res, err := f.Do(r)
+		if err != nil {
+			fmt.Println(err)
+			w.WriteHeader(http.StatusInternalServerError)
+			return
+		}
+
+		w.Header().Set("content-type", "application/json")
+		io.Copy(w, res.Body)
+	})
+	workers.Serve(handler)
+}
diff --git a/examples/fetch/worker.mjs b/examples/fetch/worker.mjs
new file mode 100644
index 0000000..649ccf0
--- /dev/null
+++ b/examples/fetch/worker.mjs
@@ -0,0 +1,22 @@
+import "../assets/polyfill_performance.js";
+import "../assets/wasm_exec.js";
+import mod from "./dist/app.wasm";
+
+const go = new Go();
+
+const readyPromise = new Promise((resolve) => {
+  globalThis.ready = resolve;
+});
+
+const load = WebAssembly.instantiate(mod, go.importObject).then((instance) => {
+  go.run(instance);
+  return instance;
+});
+
+export default {
+  async fetch(req, env, ctx) {
+    await load;
+    await readyPromise;
+    return handleRequest(req, { env, ctx });
+  }
+}
diff --git a/examples/fetch/wrangler.toml b/examples/fetch/wrangler.toml
new file mode 100644
index 0000000..7e607bb
--- /dev/null
+++ b/examples/fetch/wrangler.toml
@@ -0,0 +1,6 @@
+name = "fetch"
+main = "./worker.mjs"
+compatibility_date = "2023-02-24"
+
+[build]
+command = "make build"