mirror of
https://github.com/dutchcoders/transfer.sh.git
synced 2025-01-15 05:00:18 +01:00
106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
// Copyright 2015 Google Inc. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package marbl
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import (
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"crypto/rand"
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"encoding/hex"
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"net/http"
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"sync"
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"github.com/google/martian/log"
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"golang.org/x/net/websocket"
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)
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// Handler exposes marbl logs over websockets.
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type Handler struct {
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mu sync.RWMutex
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subs map[string]chan<- []byte
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}
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// NewHandler instantiates a Handler with an empty set of subscriptions.
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func NewHandler() *Handler {
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return &Handler{
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subs: make(map[string]chan<- []byte),
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}
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}
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// Write writes frames to all websocket subscribers and returns the number
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// of bytes written and an error.
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func (h *Handler) Write(b []byte) (int, error) {
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h.mu.RLock()
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defer h.mu.RUnlock()
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for id, framec := range h.subs {
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select {
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case framec <- b:
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default:
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log.Errorf("logstream: buffer full for connection, dropping")
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close(framec)
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delete(h.subs, id)
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}
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}
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return len(b), nil
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}
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func (h *Handler) ServeHTTP(rw http.ResponseWriter, req *http.Request) {
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websocket.Server{Handler: h.streamLogs}.ServeHTTP(rw, req)
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}
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func (h *Handler) streamLogs(conn *websocket.Conn) {
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defer conn.Close()
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id, err := newID()
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if err != nil {
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log.Errorf("logstream: failed to create ID: %v", err)
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return
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}
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framec := make(chan []byte, 16384)
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h.subscribe(id, framec)
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defer h.unsubscribe(id)
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for b := range framec {
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if err := websocket.Message.Send(conn, b); err != nil {
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log.Errorf("logstream: failed to send message: %v", err)
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return
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}
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}
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}
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func newID() (string, error) {
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src := make([]byte, 8)
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if _, err := rand.Read(src); err != nil {
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return "", err
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}
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return hex.EncodeToString(src), nil
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}
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func (h *Handler) unsubscribe(id string) {
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h.mu.Lock()
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defer h.mu.Unlock()
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delete(h.subs, id)
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}
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func (h *Handler) subscribe(id string, framec chan<- []byte) {
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h.mu.Lock()
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defer h.mu.Unlock()
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h.subs[id] = framec
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}
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