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// Copyright 2022 The Dawn Authors
//
// 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 cov
import (
"bytes"
"context"
"fmt"
"io"
"net/http"
"os"
"path/filepath"
"strings"
"dawn.googlesource.com/dawn/tools/src/fileutils"
)
// StartServer starts a localhost http server to display the coverage data.
// Calls started() when the server is started, and then blocks until the context is cancelled.
func StartServer(ctx context.Context, port int, covData []byte, started func() error) error {
ctx, stop := context.WithCancel(ctx)
url := fmt.Sprintf("http://localhost:%v/index.html", port)
handler := http.NewServeMux()
handler.HandleFunc("/index.html", func(w http.ResponseWriter, r *http.Request) {
f, err := os.Open(filepath.Join(fileutils.DawnRoot(), "tools/src/cov/view-coverage.html"))
if err != nil {
fmt.Fprint(w, "file not found")
w.WriteHeader(http.StatusNotFound)
return
}
defer f.Close()
io.Copy(w, f)
})
handler.HandleFunc("/coverage.dat", func(w http.ResponseWriter, r *http.Request) {
io.Copy(w, bytes.NewReader(covData))
})
handler.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
rel := r.URL.Path
if r.URL.Path == "" {
http.Redirect(w, r, url, http.StatusSeeOther)
return
}
if strings.Contains(rel, "..") {
w.WriteHeader(http.StatusBadRequest)
fmt.Fprint(w, "file path must not contain '..'")
return
}
f, err := os.Open(filepath.Join(fileutils.DawnRoot(), r.URL.Path))
if err != nil {
w.WriteHeader(http.StatusNotFound)
fmt.Fprintf(w, "file '%v' not found", r.URL.Path)
return
}
defer f.Close()
io.Copy(w, f)
})
handler.HandleFunc("/viewer.closed", func(w http.ResponseWriter, r *http.Request) {
stop()
})
server := &http.Server{Addr: fmt.Sprint(":", port), Handler: handler}
go server.ListenAndServe()
if err := started(); err != nil {
return err
}
<-ctx.Done()
err := server.Shutdown(ctx)
switch err {
case nil, context.Canceled:
return nil
default:
return err
}
}