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wsl.go
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wsl.go
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// Copyright 2018 Google Inc.
//
// 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 wsl implements the basic server code for WSL (Webdriver Server Light),
// a lightweight replacement for Selenium Server.
package wsl
import (
"context"
"encoding/json"
"fmt"
"log"
"net/http"
"runtime"
"time"
"github.com/bazelbuild/rules_webtesting/go/httphelper"
"github.com/bazelbuild/rules_webtesting/go/wsl/hub"
"github.com/bazelbuild/rules_webtesting/go/wsl/upload"
)
// Run starts the WSL server.
func Run(localHost string, port int, downloadRoot, uploadRoot string) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
handler := createHandler(hub.New(localHost, &upload.Uploader{Root: uploadRoot}), downloadRoot, cancel)
if err := startServer(ctx, port, handler); err != nil {
log.Print(err)
}
}
func startServer(ctx context.Context, port int, handler http.Handler) error {
server := &http.Server{
Addr: fmt.Sprintf(":%d", port),
Handler: handler,
}
errChan := make(chan error)
go func() {
log.Printf("Listening on %s", server.Addr)
errChan <- server.ListenAndServe()
close(errChan)
}()
select {
case <-ctx.Done():
shutdownCtx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
defer cancel()
return server.Shutdown(shutdownCtx)
case err := <-errChan:
return err
}
}
func createHandler(hub http.Handler, downloadRoot string, shutdown func()) http.Handler {
handler := http.NewServeMux()
shutdownFunc := func(w http.ResponseWriter, _ *http.Request) {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
httphelper.SetDefaultResponseHeaders(w.Header())
w.WriteHeader(http.StatusOK)
w.Write([]byte("shutting down"))
shutdown()
}
handler.HandleFunc("/quitquitquit", shutdownFunc)
handler.HandleFunc("/shutdown", shutdownFunc)
handler.HandleFunc("/healthz", func(w http.ResponseWriter, _ *http.Request) {
w.Header().Set("Content-Type", "text/plain; charset=utf-8")
httphelper.SetDefaultResponseHeaders(w.Header())
w.WriteHeader(http.StatusOK)
w.Write([]byte("ok"))
})
handler.Handle("/session", hub)
handler.Handle("/session/", hub)
handler.HandleFunc("/status", func(w http.ResponseWriter, _ *http.Request) {
w.Header().Set("Content-Type", "application/json; charset=utf-8")
httphelper.SetDefaultResponseHeaders(w.Header())
w.WriteHeader(http.StatusOK)
respJSON := map[string]interface{}{
"status": 0,
"value": map[string]interface{}{
"build": map[string]interface{}{
"version": "unknown",
"revision": "unknown",
"time": "unknown",
},
"os": map[string]interface{}{
"arch": runtime.GOARCH,
"name": runtime.GOOS,
"version": "unknown",
},
"ready": true,
"message": "ready to create new sessions",
},
}
json.NewEncoder(w).Encode(respJSON)
})
handler.Handle("/google/staticfile/", http.StripPrefix("/google/staticfile/", http.FileServer(http.Dir(downloadRoot))))
return handler
}