github.com/uber-go/tally/v4@v4.1.17/m3/example/local_server.go (about)

     1  // Copyright (c) 2021 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 main
    22  
    23  import (
    24  	"bytes"
    25  	"fmt"
    26  	"net"
    27  	"sync/atomic"
    28  
    29  	"github.com/uber-go/tally/v4/m3"
    30  	customtransport "github.com/uber-go/tally/v4/m3/customtransports"
    31  	m3thrift "github.com/uber-go/tally/v4/m3/thrift/v1"
    32  	"github.com/uber-go/tally/v4/thirdparty/github.com/apache/thrift/lib/go/thrift"
    33  )
    34  
    35  type batchCallback func(batch *m3thrift.MetricBatch)
    36  
    37  type localM3Server struct {
    38  	Service   *localM3Service
    39  	Addr      string
    40  	protocol  m3.Protocol
    41  	processor thrift.TProcessor
    42  	conn      *net.UDPConn
    43  	closed    int32
    44  }
    45  
    46  func newLocalM3Server(
    47  	listenAddr string,
    48  	protocol m3.Protocol,
    49  	fn batchCallback,
    50  ) (*localM3Server, error) {
    51  	udpAddr, err := net.ResolveUDPAddr("udp", listenAddr)
    52  	if err != nil {
    53  		return nil, err
    54  	}
    55  
    56  	service := newLocalM3Service(fn)
    57  	processor := m3thrift.NewM3Processor(service)
    58  	conn, err := net.ListenUDP(udpAddr.Network(), udpAddr)
    59  	if err != nil {
    60  		return nil, err
    61  	}
    62  
    63  	return &localM3Server{
    64  		Service:   service,
    65  		Addr:      conn.LocalAddr().String(),
    66  		conn:      conn,
    67  		protocol:  protocol,
    68  		processor: processor,
    69  	}, nil
    70  }
    71  
    72  func (f *localM3Server) Serve() error {
    73  	readBuf := make([]byte, 65536)
    74  	for {
    75  		n, err := f.conn.Read(readBuf)
    76  		if err != nil {
    77  			if atomic.LoadInt32(&f.closed) == 0 {
    78  				return fmt.Errorf("failed to read: %v", err)
    79  			}
    80  			return nil
    81  		}
    82  		trans, _ := customtransport.NewTBufferedReadTransport(bytes.NewBuffer(readBuf[0:n]))
    83  		var proto thrift.TProtocol
    84  		if f.protocol == m3.Compact {
    85  			proto = thrift.NewTCompactProtocol(trans)
    86  		} else {
    87  			proto = thrift.NewTBinaryProtocolTransport(trans)
    88  		}
    89  
    90  		if _, err = f.processor.Process(proto, proto); err != nil {
    91  			fmt.Println("Error processing thrift metric:", err)
    92  		}
    93  	}
    94  }
    95  
    96  func (f *localM3Server) Close() error {
    97  	atomic.AddInt32(&f.closed, 1)
    98  	return f.conn.Close()
    99  }
   100  
   101  type localM3Service struct {
   102  	fn batchCallback
   103  }
   104  
   105  func newLocalM3Service(fn batchCallback) *localM3Service {
   106  	return &localM3Service{fn: fn}
   107  }
   108  
   109  func (m *localM3Service) EmitMetricBatch(batch *m3thrift.MetricBatch) (err error) {
   110  	m.fn(batch)
   111  	return thrift.NewTTransportException(thrift.END_OF_FILE, "complete")
   112  }