github.com/m3db/m3@v1.5.0/src/msg/consumer/handlers.go (about)

     1  // Copyright (c) 2018 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package consumer
    22  
    23  import (
    24  	"io"
    25  	"net"
    26  	"time"
    27  
    28  	"github.com/m3db/m3/src/x/server"
    29  
    30  	"go.uber.org/zap"
    31  )
    32  
    33  type messageHandler struct {
    34  	opts      Options
    35  	mPool     *messagePool
    36  	mpFactory MessageProcessorFactory
    37  	m         metrics
    38  }
    39  
    40  // NewMessageHandler creates a new server handler with messageFn.
    41  func NewMessageHandler(mpFactory MessageProcessorFactory, opts Options) server.Handler {
    42  	mPool := newMessagePool(opts.MessagePoolOptions())
    43  	mPool.Init()
    44  	return &messageHandler{
    45  		mpFactory: mpFactory,
    46  		opts:      opts,
    47  		mPool:     mPool,
    48  		m:         newConsumerMetrics(opts.InstrumentOptions().MetricsScope()),
    49  	}
    50  }
    51  
    52  func (h *messageHandler) Handle(conn net.Conn) {
    53  	mp := h.mpFactory.Create()
    54  	c := newConsumer(conn, h.mPool, h.opts, h.m, mp)
    55  	c.Init()
    56  	var (
    57  		msgErr error
    58  		msg    Message
    59  	)
    60  	for {
    61  		msg, msgErr = c.Message()
    62  		if msgErr != nil {
    63  			break
    64  		}
    65  		start := time.Now()
    66  		c.process(msg)
    67  		h.m.handleLatency.RecordDuration(time.Since(start))
    68  	}
    69  	if msgErr != nil && msgErr != io.EOF {
    70  		h.opts.InstrumentOptions().Logger().With(zap.Error(msgErr)).Error("could not read message from consumer")
    71  	}
    72  	mp.Close()
    73  	c.Close()
    74  }
    75  
    76  func (h *messageHandler) Close() {
    77  	h.mpFactory.Close()
    78  }