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// Copyright (c) 2021 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package main
import (
"bytes"
"fmt"
"net"
"sync/atomic"
"github.com/uber-go/tally/v4/m3"
customtransport "github.com/uber-go/tally/v4/m3/customtransports"
m3thrift "github.com/uber-go/tally/v4/m3/thrift/v1"
"github.com/uber-go/tally/v4/thirdparty/github.com/apache/thrift/lib/go/thrift"
)
type batchCallback func(batch *m3thrift.MetricBatch)
type localM3Server struct {
Service *localM3Service
Addr string
protocol m3.Protocol
processor thrift.TProcessor
conn *net.UDPConn
closed int32
}
func newLocalM3Server(
listenAddr string,
protocol m3.Protocol,
fn batchCallback,
) (*localM3Server, error) {
udpAddr, err := net.ResolveUDPAddr("udp", listenAddr)
if err != nil {
return nil, err
}
service := newLocalM3Service(fn)
processor := m3thrift.NewM3Processor(service)
conn, err := net.ListenUDP(udpAddr.Network(), udpAddr)
if err != nil {
return nil, err
}
return &localM3Server{
Service: service,
Addr: conn.LocalAddr().String(),
conn: conn,
protocol: protocol,
processor: processor,
}, nil
}
func (f *localM3Server) Serve() error {
readBuf := make([]byte, 65536)
for {
n, err := f.conn.Read(readBuf)
if err != nil {
if atomic.LoadInt32(&f.closed) == 0 {
return fmt.Errorf("failed to read: %v", err)
}
return nil
}
trans, _ := customtransport.NewTBufferedReadTransport(bytes.NewBuffer(readBuf[0:n]))
var proto thrift.TProtocol
if f.protocol == m3.Compact {
proto = thrift.NewTCompactProtocol(trans)
} else {
proto = thrift.NewTBinaryProtocolTransport(trans)
}
if _, err = f.processor.Process(proto, proto); err != nil {
fmt.Println("Error processing thrift metric:", err)
}
}
}
func (f *localM3Server) Close() error {
atomic.AddInt32(&f.closed, 1)
return f.conn.Close()
}
type localM3Service struct {
fn batchCallback
}
func newLocalM3Service(fn batchCallback) *localM3Service {
return &localM3Service{fn: fn}
}
func (m *localM3Service) EmitMetricBatch(batch *m3thrift.MetricBatch) (err error) {
m.fn(batch)
return thrift.NewTTransportException(thrift.END_OF_FILE, "complete")
}
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