Add jsgo.io example

vendor/github.com/dave/wasmgo/cmd/deployer/deployer.go

@@ -0,0 +1,342 @@
+package deployer
+
+import (
+	"bytes"
+	"crypto/sha1"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net/http"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+	"text/template"
+
+	"github.com/dave/jsgo/assets/std"
+	"github.com/dave/jsgo/server/servermsg"
+	"github.com/dave/jsgo/server/wasm/messages"
+	"github.com/dave/services/constor/constormsg"
+	"github.com/dave/wasmgo/cmd/cmdconfig"
+	"github.com/dave/wasmgo/config"
+	"github.com/gorilla/websocket"
+	"github.com/pkg/browser"
+)
+
+const CLIENT_VERSION = "1.0.0"
+
+func Start(cfg *cmdconfig.Config) error {
+
+	var debug io.Writer
+	if cfg.Verbose {
+		debug = os.Stdout
+	} else {
+		debug = ioutil.Discard
+	}
+
+	// create a temp dir
+	tempDir, err := ioutil.TempDir("", "")
+	if err != nil {
+		return err
+	}
+	defer os.RemoveAll(tempDir)
+
+	fpath := filepath.Join(tempDir, "out.wasm")
+
+	sourceDir, err := runGoList(cfg)
+	if err != nil {
+		return err
+	}
+
+	if err := runGoBuild(cfg, fpath, debug); err != nil {
+		return err
+	}
+
+	binaryBytes, err := ioutil.ReadFile(fpath)
+	if err != nil {
+		return err
+	}
+	binarySha := sha1.New()
+	if _, err := io.Copy(binarySha, bytes.NewBuffer(binaryBytes)); err != nil {
+		return err
+	}
+
+	files := map[messages.DeployFileType]messages.DeployFile{}
+
+	files[messages.DeployFileTypeWasm] = messages.DeployFile{
+		DeployFileKey: messages.DeployFileKey{
+			Type: messages.DeployFileTypeWasm,
+			Hash: fmt.Sprintf("%x", binarySha.Sum(nil)),
+		},
+		Contents: binaryBytes,
+	}
+
+	loaderBuf := &bytes.Buffer{}
+	loaderSha := sha1.New()
+	wasmUrl := fmt.Sprintf("%s://%s/%x.wasm", config.Protocol[config.Pkg], config.Host[config.Pkg], binarySha.Sum(nil))
+	loaderVars := struct{ Binary string }{
+		Binary: wasmUrl,
+	}
+	if err := loaderTemplateMin.Execute(io.MultiWriter(loaderBuf, loaderSha), loaderVars); err != nil {
+		return err
+	}
+
+	files[messages.DeployFileTypeLoader] = messages.DeployFile{
+		DeployFileKey: messages.DeployFileKey{
+			Type: messages.DeployFileTypeLoader,
+			Hash: fmt.Sprintf("%x", loaderSha.Sum(nil)),
+		},
+		Contents: loaderBuf.Bytes(),
+	}
+
+	indexBuf := &bytes.Buffer{}
+	indexSha := sha1.New()
+	loaderUrl := fmt.Sprintf("%s://%s/%x.js", config.Protocol[config.Pkg], config.Host[config.Pkg], loaderSha.Sum(nil))
+	indexVars := struct{ Script, Loader string }{
+		Script: fmt.Sprintf("%s://%s/wasm_exec.%s.js", config.Protocol[config.Pkg], config.Host[config.Pkg], std.Wasm[true]),
+		Loader: loaderUrl,
+	}
+	indexTemplate := defaultIndexTemplate
+	if cfg.Index != "" {
+		indexFilename := cfg.Index
+		if cfg.Path != "" {
+			indexFilename = filepath.Join(sourceDir, cfg.Index)
+		}
+		indexTemplateBytes, err := ioutil.ReadFile(indexFilename)
+		if err != nil && !os.IsNotExist(err) {
+			return err
+		}
+		if err == nil {
+			indexTemplate, err = template.New("main").Parse(string(indexTemplateBytes))
+			if err != nil {
+				return err
+			}
+		}
+	}
+	if err := indexTemplate.Execute(io.MultiWriter(indexBuf, indexSha), indexVars); err != nil {
+		return err
+	}
+
+	files[messages.DeployFileTypeIndex] = messages.DeployFile{
+		DeployFileKey: messages.DeployFileKey{
+			Type: messages.DeployFileTypeIndex,
+			Hash: fmt.Sprintf("%x", indexSha.Sum(nil)),
+		},
+		Contents: indexBuf.Bytes(),
+	}
+
+	indexUrl := fmt.Sprintf("%s://%s/%x", config.Protocol[config.Index], config.Host[config.Index], indexSha.Sum(nil))
+
+	message := messages.DeployQuery{
+		Version: CLIENT_VERSION,
+		Files: []messages.DeployFileKey{
+			files[messages.DeployFileTypeWasm].DeployFileKey,
+			files[messages.DeployFileTypeIndex].DeployFileKey,
+			files[messages.DeployFileTypeLoader].DeployFileKey,
+		},
+	}
+
+	fmt.Fprintln(debug, "Querying server...")
+
+	protocol := "wss"
+	if config.Protocol[config.Wasm] == "http" {
+		protocol = "ws"
+	}
+	conn, _, err := websocket.DefaultDialer.Dial(
+		fmt.Sprintf("%s://%s/_wasm/", protocol, config.Host[config.Wasm]),
+		http.Header{"Origin": []string{fmt.Sprintf("%s://%s/", config.Protocol[config.Wasm], config.Host[config.Wasm])}},
+	)
+	if err != nil {
+		return err
+	}
+
+	messageBytes, messageType, err := messages.Marshal(message)
+	if err != nil {
+		return err
+	}
+	if err := conn.WriteMessage(messageType, messageBytes); err != nil {
+		return err
+	}
+
+	var response messages.DeployQueryResponse
+	var done bool
+	for !done {
+		_, replyBytes, err := conn.ReadMessage()
+		if err != nil {
+			return err
+		}
+		message, err := messages.Unmarshal(replyBytes)
+		if err != nil {
+			return err
+		}
+		switch message := message.(type) {
+		case messages.DeployQueryResponse:
+			response = message
+			done = true
+		case servermsg.Queueing:
+			// don't print
+		case servermsg.Error:
+			return errors.New(message.Message)
+		case messages.DeployClientVersionNotSupported:
+			return errors.New("this client version is not supported - try `go get -u github.com/dave/wasmgo`")
+		default:
+			// unexpected
+			fmt.Fprintf(debug, "Unexpected message from server: %#v\n", message)
+		}
+	}
+
+	if len(response.Required) > 0 {
+
+		fmt.Fprintf(debug, "Files required: %d.\n", len(response.Required))
+		fmt.Fprintln(debug, "Bundling required files...")
+
+		var required []messages.DeployFile
+		for _, k := range response.Required {
+			file := files[k.Type]
+			if file.Hash == "" {
+				return errors.New("server requested file not found")
+			}
+			required = append(required, file)
+		}
+
+		payload := messages.DeployPayload{Files: required}
+		payloadBytes, payloadType, err := messages.Marshal(payload)
+		if err != nil {
+			return err
+		}
+		if err := conn.WriteMessage(payloadType, payloadBytes); err != nil {
+			return err
+		}
+
+		fmt.Fprintf(debug, "Sending payload: %dKB.\n", len(payloadBytes)/1024)
+
+		done = false
+		for !done {
+			_, replyBytes, err := conn.ReadMessage()
+			if err != nil {
+				return err
+			}
+			message, err := messages.Unmarshal(replyBytes)
+			if err != nil {
+				return err
+			}
+			switch message := message.(type) {
+			case messages.DeployDone:
+				done = true
+			case servermsg.Queueing:
+				// don't print
+			case servermsg.Error:
+				return errors.New(message.Message)
+			case constormsg.Storing:
+				if message.Remain > 0 || message.Finished > 0 {
+					fmt.Fprintf(debug, "Storing, %d to go.\n", message.Remain)
+				}
+			default:
+				// unexpected
+				fmt.Fprintf(debug, "Unexpected message from server: %#v\n", message)
+			}
+		}
+
+		fmt.Fprintln(debug, "Sending done.")
+
+	} else {
+		fmt.Fprintln(debug, "No files required.")
+	}
+
+	outputVars := struct {
+		Page   string
+		Loader string
+	}{
+		Page:   indexUrl,
+		Loader: loaderUrl,
+	}
+
+	if cfg.Json {
+		out, err := json.Marshal(outputVars)
+		if err != nil {
+			return err
+		}
+		fmt.Println(string(out))
+	} else {
+		tpl, err := template.New("main").Parse(cfg.Template)
+		if err != nil {
+			return err
+		}
+		tpl.Execute(os.Stdout, outputVars)
+		fmt.Println("")
+	}
+
+	if cfg.Open {
+		browser.OpenURL(indexUrl)
+	}
+
+	return nil
+}
+
+func runGoBuild(cfg *cmdconfig.Config, fpath string, debug io.Writer) error {
+	args := []string{"build", "-o", fpath}
+
+	extraFlags := strings.Fields(cfg.Flags)
+	for _, f := range extraFlags {
+		args = append(args, f)
+	}
+
+	if cfg.BuildTags != "" {
+		args = append(args, "-tags", cfg.BuildTags)
+	}
+
+	path := "."
+	if cfg.Path != "" {
+		path = cfg.Path
+	}
+	args = append(args, path)
+
+	fmt.Fprintln(debug, "Compiling...")
+
+	cmd := exec.Command(cfg.Command, args...)
+	cmd.Env = os.Environ()
+	cmd.Env = append(cmd.Env, "GOARCH=wasm")
+	cmd.Env = append(cmd.Env, "GOOS=js")
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		if strings.Contains(string(output), "unsupported GOOS/GOARCH pair js/wasm") {
+			return errors.New("you need Go v1.11 to compile WASM. It looks like your default `go` command is not v1.11. Perhaps you need the -c flag to specify a custom command name - e.g. `-c=go1.11beta3`")
+		}
+		return fmt.Errorf("%v: %s", err, string(output))
+	}
+	if len(output) > 0 {
+		return fmt.Errorf("%s", string(output))
+	}
+	return nil
+}
+
+func runGoList(cfg *cmdconfig.Config) (string, error) {
+	args := []string{"list"}
+
+	if cfg.BuildTags != "" {
+		args = append(args, "-tags", cfg.BuildTags)
+	}
+
+	args = append(args, "-f", "{{.Dir}}")
+
+	path := "."
+	if cfg.Path != "" {
+		path = cfg.Path
+	}
+	args = append(args, path)
+
+	cmd := exec.Command(cfg.Command, args...)
+	cmd.Env = os.Environ()
+	cmd.Env = append(cmd.Env, "GOARCH=wasm")
+	cmd.Env = append(cmd.Env, "GOOS=js")
+	output, err := cmd.CombinedOutput()
+	if err != nil {
+		if strings.Contains(string(output), "unsupported GOOS/GOARCH pair js/wasm") {
+			return "", errors.New("you need Go v1.11 to compile WASM. It looks like your default `go` command is not v1.11. Perhaps you need the -c flag to specify a custom command name - e.g. `-c=go1.11beta3`")
+		}
+		return "", fmt.Errorf("%v: %s", err, string(output))
+	}
+	return string(output), nil
+}

vendor/github.com/dave/wasmgo/cmd/deployer/templates.go

@@ -0,0 +1,24 @@
+package deployer
+
+import "text/template"
+
+var defaultIndexTemplate = template.Must(template.New("main").Parse(`<html>
+<head><meta charset="utf-8"></head>
+<body>
+	<script src="{{ .Script }}"></script>
+	<script src="{{ .Loader }}"></script>
+</body>
+</html>`))
+
+var loaderTemplate = template.Must(template.New("main").Parse(`if (!WebAssembly.instantiateStreaming) {
+	WebAssembly.instantiateStreaming = async (resp, importObject) => {
+		const source = await (await resp).arrayBuffer();
+		return await WebAssembly.instantiate(source, importObject);
+	};
+}
+const go = new Go();
+WebAssembly.instantiateStreaming(fetch("{{ .Binary }}"), go.importObject).then(result => {
+	go.run(result.instance);
+});`))
+
+var loaderTemplateMin = template.Must(template.New("main").Parse(`WebAssembly.instantiateStreaming||(WebAssembly.instantiateStreaming=(async(t,a)=>{const e=await(await t).arrayBuffer();return await WebAssembly.instantiate(e,a)}));const go=new Go;WebAssembly.instantiateStreaming(fetch("{{ .Binary }}"),go.importObject).then(t=>{go.run(t.instance)});`))