prometheus/web/blob/blob.go

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package blob
import (
"bytes"
"compress/gzip"
"fmt"
"io"
"net/http"
"strings"
"github.com/prometheus/log"
"github.com/prometheus/prometheus/util/route"
)
// Sub-directories for templates and static content.
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const (
TemplateFiles = "templates"
StaticFiles = "static"
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)
var mimeMap = map[string]string{
"css": "text/css",
"js": "text/javascript",
"descriptor": "application/vnd.google.protobuf;proto=google.protobuf.FileDescriptorSet",
}
// GetFile retrieves the content of an embedded file.
func GetFile(bucket string, name string) ([]byte, error) {
blob, ok := files[bucket][name]
if !ok {
return nil, fmt.Errorf("could not find %s/%s (missing or updated files.go?)", bucket, name)
}
reader := bytes.NewReader(blob)
gz, err := gzip.NewReader(reader)
if err != nil {
return nil, err
}
var b bytes.Buffer
io.Copy(&b, gz)
gz.Close()
return b.Bytes(), nil
}
// Handler implements http.Handler.
type Handler struct{}
func (h Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
ctx := route.Context(r)
name := strings.Trim(route.Param(ctx, "filepath"), "/")
if name == "" {
name = "index.html"
}
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file, err := GetFile(StaticFiles, name)
if err != nil {
if err != io.EOF {
log.Warn("Could not get file: ", err)
}
w.WriteHeader(http.StatusNotFound)
return
}
contentType := http.DetectContentType(file)
if strings.Contains(contentType, "text/plain") || strings.Contains(contentType, "application/octet-stream") {
parts := strings.Split(name, ".")
contentType = mimeMap[parts[len(parts)-1]]
}
w.Header().Set("Content-Type", contentType)
w.Header().Set("Cache-Control", "public, max-age=259200")
w.Write(file)
}