Golang log.Printf函數代碼示例

func (s *Server) DeleteMessageHandler(w http.ResponseWriter, r *http.Request) {
	login, err := getYandexLogin(r)
	if login == "" || err != nil {
		writeError(w, 403, "forbidden")
		return
	}

	subject := r.FormValue("subject")
	if subject != "" {
		log.Printf("DELETE login=%s subject=%s", login, subject)
		err = s.deleteMessagesBySubject(login, subject)
		if err != nil {
			writeError(w, 500, "failed to delete message: "+err.Error())
			return
		}
	}

	id := r.FormValue("id")
	if id != "" {
		log.Printf("DELETE login=%s id=%s", login, id)
		err = s.deleteMessagesByID(login, id)
		if err != nil {
			writeError(w, 500, "failed to delete message: "+err.Error())
			return
		}
	}

	writeResponse(w, 200, map[string]interface{}{
		"status": "success",
	})
}

// Processes new tasks
func (m *etcdMinion) processTask(t *task.Task) error {
	var buf bytes.Buffer

	// Update state of task to indicate that we are now processing it
	t.State = task.TaskStateProcessing
	m.SaveTaskResult(t)

	cmd := exec.Command(t.Command, t.Args...)
	cmd.Stdout = &buf
	cmd.Stderr = &buf

	log.Printf("Processing task %s\n", t.TaskID)

	cmdError := cmd.Run()
	t.TimeProcessed = time.Now().Unix()
	t.Result = buf.String()

	if cmdError != nil {
		log.Printf("Failed to process task %s\n", t.TaskID)
		t.Error = cmdError.Error()
		t.State = task.TaskStateFailed
	} else {
		log.Printf("Finished processing task %s\n", t.TaskID)
		t.State = task.TaskStateSuccess
	}

	m.SaveTaskResult(t)

	return cmdError
}

// RootObject returns the root permanode for this importer account.
func (h *Host) RootObject() (*Object, error) {
	res, err := h.search.GetPermanodesWithAttr(&search.WithAttrRequest{
		N:     2, // only expect 1
		Attr:  "camliImportRoot",
		Value: h.imp.Prefix(),
	})
	if err != nil {
		log.Printf("RootObject searching GetPermanodesWithAttr: %v", err)
		return nil, err
	}
	if len(res.WithAttr) == 0 {
		obj, err := h.NewObject()
		if err != nil {
			return nil, err
		}
		log.Printf("No root object found. Created %v", obj.pn)
		if err := obj.SetAttr("camliImportRoot", h.imp.Prefix()); err != nil {
			return nil, err
		}
		return obj, nil
	}
	if len(res.WithAttr) > 1 {
		return nil, fmt.Errorf("Found %d import roots for %q; want 1", len(res.WithAttr), h.imp.Prefix())
	}
	pn := res.WithAttr[0].Permanode
	return h.ObjectFromRef(pn)
}

func (s *Session) handleBind(stream conn.Conn, bind *proto.Bind) (err error) {
	//	stream.Debug("Binding new tunnel: %v", bind)
	log.Printf("Binding new tunnel: %v\n", bind)
	respond := func(resp *proto.BindResp) {
		if err = proto.WriteMsg(stream, resp); err != nil {
			err := fmt.Errorf("Failed to send bind response: %v", err)
			log.Println(err)
			//			err = stream.Error("Failed to send bind response: %v", err)
		}
	}

	if err = s.hooks.OnBind(s, bind); err != nil {
		return
	}

	t, err := newTunnel(bind, s, s.binders, s.tunnelHooks)
	if err != nil {
		respond(&proto.BindResp{Error: err.Error()})
		return
	}
	//	t.Info("Registered new tunnel on session %s", s.id)
	log.Printf("[INFO] Registered new tunnel on session %s", s.id)

	// add it to the list of tunnels
	s.addTunnel(t)

	// acknowledge success
	respond(&proto.BindResp{Url: t.url})
	return
}

func handleHook(h *hook.Hook, headers, query, payload *map[string]interface{}, body *[]byte) string {
	cmd := exec.Command(h.ExecuteCommand)
	cmd.Args = h.ExtractCommandArguments(headers, query, payload)
	cmd.Dir = h.CommandWorkingDirectory

	log.Printf("executing %s (%s) with arguments %s using %s as cwd\n", h.ExecuteCommand, cmd.Path, cmd.Args, cmd.Dir)

	out, err := cmd.CombinedOutput()

	log.Printf("command output: %s\n", out)

	var errorResponse string

	if err != nil {
		log.Printf("error occurred: %+v\n", err)
		errorResponse = fmt.Sprintf("%+v", err)
	}

	log.Printf("finished handling %s\n", h.ID)

	var response []byte
	response, err = json.Marshal(&hook.CommandStatusResponse{ResponseMessage: h.ResponseMessage, Output: string(out), Error: errorResponse})

	if err != nil {
		log.Printf("error marshalling response: %+v", err)
		return h.ResponseMessage
	}

	return string(response)
}

func resourceAwsS3BucketObjectRead(d *schema.ResourceData, meta interface{}) error {
	s3conn := meta.(*AWSClient).s3conn

	bucket := d.Get("bucket").(string)
	key := d.Get("key").(string)
	etag := d.Get("etag").(string)

	resp, err := s3conn.HeadObject(
		&s3.HeadObjectInput{
			Bucket:  aws.String(bucket),
			Key:     aws.String(key),
			IfMatch: aws.String(etag),
		})

	if err != nil {
		// If S3 returns a 404 Request Failure, mark the object as destroyed
		if awsErr, ok := err.(awserr.RequestFailure); ok && awsErr.StatusCode() == 404 {
			d.SetId("")
			log.Printf("[WARN] Error Reading Object (%s), object not found (HTTP status 404)", key)
			return nil
		}
		return err
	}

	d.Set("cache_control", resp.CacheControl)
	d.Set("content_disposition", resp.ContentDisposition)
	d.Set("content_encoding", resp.ContentEncoding)
	d.Set("content_language", resp.ContentLanguage)
	d.Set("content_type", resp.ContentType)
	d.Set("version_id", resp.VersionId)

	log.Printf("[DEBUG] Reading S3 Bucket Object meta: %s", resp)
	return nil
}

// Classifies the minion
func (m *etcdMinion) SetClassifier(c *classifier.Classifier) error {
	// Classifiers in etcd expire after an hour
	opts := &etcdclient.SetOptions{
		PrevExist: etcdclient.PrevIgnore,
		TTL:       time.Hour,
	}

	// Serialize classifier to JSON and save it in etcd
	data, err := json.Marshal(c)
	if err != nil {
		log.Printf("Failed to serialize classifier %s: %s\n", c.Key, err)
		return err
	}

	// Classifier key in etcd
	klassifierKey := filepath.Join(m.classifierDir, c.Key)
	_, err = m.kapi.Set(context.Background(), klassifierKey, string(data), opts)

	if err != nil {
		log.Printf("Failed to set classifier %s: %s\n", c.Key, err)
		return err
	}

	return nil
}

func (ec2 *EC2) query(params map[string]string, resp interface{}) error {
	params["Version"] = "2013-02-01"
	params["Timestamp"] = timeNow().In(time.UTC).Format(time.RFC3339)
	endpoint, err := url.Parse(ec2.Region.EC2Endpoint)
	if err != nil {
		return err
	}
	if endpoint.Path == "" {
		endpoint.Path = "/"
	}
	sign(ec2.Auth, "GET", endpoint.Path, params, endpoint.Host)
	endpoint.RawQuery = multimap(params).Encode()
	if debug {
		log.Printf("get { %v } -> {\n", endpoint.String())
	}
	r, err := http.Get(endpoint.String())
	if err != nil {
		return err
	}
	defer r.Body.Close()

	if debug {
		dump, _ := httputil.DumpResponse(r, true)
		log.Printf("response:\n")
		log.Printf("%v\n}\n", string(dump))
	}
	if r.StatusCode != 200 {
		return buildError(r)
	}
	err = xml.NewDecoder(r.Body).Decode(resp)
	return err
}

// realMain is the actual entry point, but we wrap it to set
// a proper exit code on return
func realMain() int {
	if len(os.Args) == 1 {
		usage()
		return 1
	}

	// Read the configuration
	conf, err := getConfig()
	if err != nil {
		log.Printf("[ERR] %v", err)
		return 1
	}

	// Sanity check the configuration
	if errs := validateConfig(conf); len(errs) != 0 {
		for _, err := range errs {
			log.Printf("[ERR] %v", err)
		}
		return 1
	}

	// Start watching for changes
	stopCh, finishCh := watch(conf)

	// Wait for termination
	return waitForTerm(conf, stopCh, finishCh)
}

// RefreshCache updates the list of metric names in the cache from the local
// file store.  Blocks until completion.  Does not check cache freshness
// so use with care.
func (m *MetricsCacheType) RefreshCache() error {
	m.lock.Lock()
	m.updating = true

	examine := func(path string, info os.FileInfo, err error) error {
		ok, err := checkWalk(path, info, err)
		if err != nil {
			return err
		}
		if ok {
			//log.Printf("Found %s or %s", path, PathToMetric(path))
			m.metrics = append(m.metrics, PathToMetric(path))
		}
		return nil
	}

	// Create new empty slice
	log.Printf("Scaning %s for metrics...", Prefix)
	m.metrics = make([]string, 0)
	err := filepath.Walk(Prefix, examine)
	log.Printf("Scan complete.")
	if err != nil {
		log.Printf("Scan returned an Error: %s", err)
	}

	m.timestamp = time.Now().Unix()
	m.updating = false
	m.lock.Unlock()
	return nil
}

func populateServer(serv *server) []sfs.ReplicateChunkArgs {
	str := fmt.Sprintf("%s:%d", serv.addr.IP.String(), serv.addr.Port)
	log.Printf("master: PopulateServer: populating %s\n", str)
	log.Printf("master: PopulateServer: server heap state:\n%s\n", sHeap.printPresent())

	if len(chunks) == 0 {
		return nil
	}

	thisVec := new(vector.Vector)
	for _, chunk := range chunks {
		//log.Printf("master: PopulateServer: examining chunk %+v, nservers %d\n", *chunk, chunk.servers.Len())
		if chunk.servers.Len() < sfs.NREPLICAS {

			//populate chunk location list
			chunklist := make([]net.TCPAddr, chunk.servers.Len())
			for cnt1 := 0; cnt1 < chunk.servers.Len(); cnt1++ {
				chunklist[cnt1] = chunk.servers.At(cnt1).(*server).addr
			}

			//send rpc call off
			thisVec.Push(sfs.ReplicateChunkArgs{chunk.chunkID, chunklist})
		}
	}

	cnt := thisVec.Len()

	thisSlice := make([]sfs.ReplicateChunkArgs, cnt)
	for i := 0; i < cnt; i++ {
		thisSlice[i] = thisVec.Pop().(sfs.ReplicateChunkArgs) //horribly inefficient but what can you do...
	}

	return thisSlice
}

func (self *Task) Signal(sig os.Signal) {
	log.Printf("Signaling: %s", self.Config.ShortName)
	for _, proc := range self.Running {
		log.Printf("Signaled: %d - %s", proc.Process.Pid, sig)
		proc.Process.Signal(sig)
	}
}

func GetMember(email, password string) (Member, error) {
	log.Printf("Get member '%s' ('%s')", email, password)
	db, err := GetDBConnection()
	if err == nil {
		defer db.Close()
		pwd := sha256.Sum256([]byte(password))
		log.Printf("Encrypted password: %s", hex.EncodeToString(pwd[:]))
		row := db.QueryRow(`SELECT id, email, first_name
			FROM Member
			WHERE email = $1 AND password = $2`,
			email,
			hex.EncodeToString(pwd[:]),
		)
		result := Member{}
		err = row.Scan(&result.id, &result.email, &result.firstName)
		log.Printf("Err: %v", err)
		if err == nil {
			return result, nil
		} else {
			return result, errors.New("Unable to find Member with email: " + email)
		}
	} else {
		return Member{}, errors.New("Unable to get database connection")
	}
}

// parser() reads all incoming messages from the consumer, and parses them into
// influxdb metric points.
func (k *Kafka) parser() {
	for {
		select {
		case <-k.done:
			return
		case err := <-k.errs:
			log.Printf("Kafka Consumer Error: %s\n", err.Error())
		case msg := <-k.in:
			points, err := jsonToPoints(msg.Value)
			if err != nil {
				log.Printf("Could not parse kafka message: %s, error: %s",
					string(msg.Value), err.Error())
			}

			for _, point := range points {
				select {
				case k.pointChan <- point:
					continue
				default:
					log.Printf("Kafka Consumer buffer is full, dropping a point." +
						" You may want to increase the point_buffer setting")
				}
			}

			if !k.doNotCommitMsgs {
				// TODO(cam) this locking can be removed if this PR gets merged:
				// https://github.com/wvanbergen/kafka/pull/84
				k.Lock()
				k.Consumer.CommitUpto(msg)
				k.Unlock()
			}
		}
	}
}

//
// Make sure everything is ok to proceed.
// 1. Ensure that data directory is present and writable.
//
func ensureEnvironment(conf *Config) {
	log.Printf("Checking Environment...\n")

	ensureDataDir(conf)

	log.Printf("done.\n")
}