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We also recommend that a + file or class name and description of purpose be included on the + same "printed page" as the copyright notice for easier + identification within third-party archives. + + Copyright {yyyy} {name of copyright owner} + + Licensed under the Apache License, Version 2.0 (the "License"); + you may not use this file except in compliance with the License. + You may obtain a copy of the License at + + http://www.apache.org/licenses/LICENSE-2.0 + + Unless required by applicable law or agreed to in writing, software + distributed under the License is distributed on an "AS IS" BASIS, + WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + See the License for the specific language governing permissions and + limitations under the License. diff --git a/README.md b/README.md new file mode 100644 index 0000000..246bf1e --- /dev/null +++ b/README.md @@ -0,0 +1,32 @@ +# WasmServe + +An HTTP server for Wasm testing like `gopherjs serve` + +## Usage + +``` +Usage of wasmserve + -http string + HTTP bind address to serve (default ":8080") + -tags string + Build tags +``` + +## Example + +```sh +# Build the latest Go. +git clone https://go.googlesource.com/go go-code +cd go-code/src +./make.sh + +# Install some libraries. +go get github.com/hajimehoshi/wasmserve +go get github.com/hajimehoshi/ebiten +go get github.com/gopherjs/gopherwasm + +# Run WasmServe with the latest Go. +~/go-code/bin/go run github.com/hajimehoshi/wasmserve -tags=example +``` + +And open `http://localhost:8080/github.com/hajimehoshi/ebiten/examples/sprites` on your browser. diff --git a/main.go b/main.go new file mode 100644 index 0000000..be3d679 --- /dev/null +++ b/main.go @@ -0,0 +1,140 @@ +// Copyright 2018 Hajime Hoshi +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +package main + +import ( + "bytes" + "flag" + "fmt" + "io/ioutil" + "log" + "net/http" + "os" + "os/exec" + "path/filepath" + "runtime" + "strings" + "time" +) + +const indexHTML = ` + + +` + +var ( + flagHTTP = flag.String("http", ":8080", "HTTP bind address to serve") + flagTags = flag.String("tags", "", "Build tags") +) + +func handle(w http.ResponseWriter, r *http.Request) { + src := filepath.Join(runtime.GOROOT(), "src") + if gopath := os.Getenv("GOPATH"); gopath != "" { + src = filepath.Join(gopath, "src") + } + path := filepath.Join(src, r.URL.Path[1:]) + + if !strings.HasSuffix(r.URL.Path, "/") { + fi, err := os.Stat(path) + if err != nil && !os.IsNotExist(err) { + http.Error(w, err.Error(), http.StatusInternalServerError) + return + } + if fi != nil && fi.IsDir() { + http.Redirect(w, r, r.URL.Path+"/", http.StatusSeeOther) + return + } + } + + if strings.HasSuffix(r.URL.Path, "/") { + path = filepath.Join(path, "index.html") + } + + switch filepath.Base(path) { + case "index.html": + if _, err := os.Stat(path); os.IsNotExist(err) { + http.ServeContent(w, r, "index.html", time.Now(), bytes.NewReader([]byte(indexHTML))) + return + } + case "wasm_exec.js": + if _, err := os.Stat(path); os.IsNotExist(err) { + f := filepath.Join(runtime.GOROOT(), "misc", "wasm", "wasm_exec.js") + http.ServeFile(w, r, f) + return + } + case "main.wasm": + if _, err := os.Stat(path); os.IsNotExist(err) { + tmp, err := ioutil.TempDir("", "") + if err != nil { + http.Error(w, err.Error(), http.StatusInternalServerError) + return + } + out := filepath.Join(tmp, "main.wasm") + + args := []string{"build", "-o", out} + if *flagTags != "" { + args = append(args, "-tags", *flagTags) + } + args = append(args, filepath.Dir(r.URL.Path[1:])) + + cmd := exec.Command(filepath.Join(runtime.GOROOT(), "bin", "go"), args...) + cmd.Env = []string{"GOOS=js", "GOARCH=wasm"} + if gopath := os.Getenv("GOPATH"); gopath != "" { + cmd.Env = append(cmd.Env, fmt.Sprintf("GOPATH=%s", gopath)) + } + stderr, err := cmd.CombinedOutput() + if err != nil { + msg := fmt.Sprintf("%s\n%s", err.Error(), string(stderr)) + http.Error(w, msg, http.StatusInternalServerError) + return + } + if len(stderr) != 0 { + http.Error(w, string(stderr), http.StatusInternalServerError) + return + } + + f, err := os.Open(out) + if err != nil { + http.Error(w, err.Error(), http.StatusInternalServerError) + return + } + defer f.Close() + http.ServeContent(w, r, "main.wasm", time.Now(), f) + return + } + } + + http.ServeFile(w, r, path) +} + +func main() { + flag.Parse() + //mime.AddExtensionType(".wasm", "application/wasm") + http.HandleFunc("/", handle) + log.Fatal(http.ListenAndServe(*flagHTTP, nil)) +}