forked from qiniu/logkit
/
socket.go
612 lines (535 loc) · 15.5 KB
/
socket.go
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package socket
import (
"bufio"
"encoding/json"
"errors"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"regexp"
"strings"
"sync"
"sync/atomic"
"time"
"github.com/axgle/mahonia"
"github.com/json-iterator/go"
"github.com/qiniu/log"
"github.com/qiniu/logkit/conf"
"github.com/qiniu/logkit/reader"
. "github.com/qiniu/logkit/reader/config"
. "github.com/qiniu/logkit/utils/models"
)
var (
_ reader.DaemonReader = &Reader{}
_ reader.Reader = &Reader{}
)
type setReadBufferer interface {
SetReadBuffer(bytes int) error
}
type streamSocketReader struct {
Listener net.Listener
*Reader
connections map[string]net.Conn
connectionsMtx sync.Mutex
}
func (ssr *streamSocketReader) listen() {
ssr.connections = map[string]net.Conn{}
defer func() {
if atomic.CompareAndSwapInt32(&ssr.status, StatusStopping, StatusStopped) {
close(ssr.readChan)
close(ssr.errChan)
}
}()
for {
c, err := ssr.Listener.Accept()
if err != nil {
if !strings.HasSuffix(err.Error(), ": use of closed network connection") {
log.Errorf("runner[%v] Reader %q error: %v", ssr.meta.RunnerName, ssr.Name(), err)
}
break
}
ssr.connectionsMtx.Lock()
if ssr.MaxConnections > 0 && len(ssr.connections) >= ssr.MaxConnections {
ssr.connectionsMtx.Unlock()
c.Close()
continue
}
ssr.connections[c.RemoteAddr().String()] = c
ssr.connectionsMtx.Unlock()
if ssr.netproto == "tcp" || ssr.netproto == "tcp4" || ssr.netproto == "tcp6" {
if err := ssr.setKeepAlive(c); err != nil {
log.Errorf("runner[%v] Reader %q unable to configure keep alive (%s): %s", ssr.meta.RunnerName, ssr.Name(), ssr.ServiceAddress, err)
}
}
go ssr.read(c)
}
ssr.connectionsMtx.Lock()
for _, c := range ssr.connections {
c.Close()
}
ssr.connectionsMtx.Unlock()
}
func (ssr *streamSocketReader) setKeepAlive(c net.Conn) error {
tcpc, ok := c.(*net.TCPConn)
if !ok {
return fmt.Errorf("cannot set keep alive on a %s socket", strings.SplitN(ssr.ServiceAddress, "://", 2)[0])
}
if ssr.KeepAlivePeriod == 0 {
return tcpc.SetKeepAlive(false)
}
if err := tcpc.SetKeepAlive(true); err != nil {
return err
}
return tcpc.SetKeepAlivePeriod(ssr.KeepAlivePeriod)
}
func (ssr *streamSocketReader) removeConnection(c net.Conn) {
ssr.connectionsMtx.Lock()
delete(ssr.connections, c.RemoteAddr().String())
ssr.connectionsMtx.Unlock()
}
type socketInfo struct {
address string
data string
}
func (ssr *streamSocketReader) read(c net.Conn) {
defer ssr.removeConnection(c)
defer c.Close()
if ssr.IsSplitByLine ||
ssr.SocketRule == SocketRuleLine ||
ssr.SocketRule == SocketRulePacket {
ssr.packetAndLineRead(c)
} else if ssr.SocketRule == SocketRuleHeadPattern {
// 后续要加
} else {
ssr.jsonRead(c)
}
return
}
func (ssr *streamSocketReader) packetAndLineRead(c net.Conn) {
var err error
defer ssr.sendError(err)
scnr := bufio.NewScanner(c)
for {
if atomic.LoadInt32(&ssr.status) == StatusStopped || atomic.LoadInt32(&ssr.status) == StatusStopping {
return
}
if ssr.ReadTimeout != 0 && ssr.ReadTimeout > 0 {
c.SetReadDeadline(time.Now().Add(ssr.ReadTimeout))
}
if !scnr.Scan() {
break
}
//double check
if atomic.LoadInt32(&ssr.status) == StatusStopped || atomic.LoadInt32(&ssr.status) == StatusStopping {
return
}
var address string
// get remote addr
if remoteAddr := c.RemoteAddr(); remoteAddr != nil && len(remoteAddr.String()) != 0 {
address = remoteAddr.String()
}
// if remote addr is empty, get local addr
if len(address) == 0 {
if localAddr := c.LocalAddr(); localAddr != nil {
address = localAddr.String()
}
}
val := string(scnr.Bytes())
if ssr.IsSplitByLine || ssr.SocketRule == SocketRuleLine {
vals := strings.Split(val, "\n")
for _, value := range vals {
if value = strings.TrimSpace(value); value != "" {
ssr.sendReadChan(address, value)
}
}
} else {
ssr.sendReadChan(address, val)
}
}
if err = scnr.Err(); err != nil {
if nErr, ok := err.(net.Error); ok && nErr.Timeout() {
log.Errorf("runner[%v] Reader %q streamSocketReader Timeout : %s", ssr.meta.RunnerName, ssr.Name(), nErr)
}
if !strings.HasSuffix(err.Error(), ": use of closed network connection") {
log.Error(err)
//可能reader都已经close了,channel也关了,直接return
return
}
if atomic.LoadInt32(&ssr.status) == StatusStopped || atomic.LoadInt32(&ssr.status) == StatusStopping {
return
}
}
}
func (ssr *streamSocketReader) jsonRead(c net.Conn) {
var err error
defer ssr.sendError(err)
bufioReader := bufio.NewReader(c)
decoder := json.NewDecoder(bufioReader)
for {
if atomic.LoadInt32(&ssr.status) == StatusStopped || atomic.LoadInt32(&ssr.status) == StatusStopping {
return
}
if ssr.ReadTimeout != 0 && ssr.ReadTimeout > 0 {
c.SetReadDeadline(time.Now().Add(ssr.ReadTimeout))
}
//double check
if atomic.LoadInt32(&ssr.status) == StatusStopped || atomic.LoadInt32(&ssr.status) == StatusStopping {
return
}
var address string
// get remote addr
if remoteAddr := c.RemoteAddr(); remoteAddr != nil && len(remoteAddr.String()) != 0 {
address = remoteAddr.String()
}
// if remote addr is empty, get local addr
if len(address) == 0 {
if localAddr := c.LocalAddr(); localAddr != nil {
address = localAddr.String()
}
}
var res interface{}
err = decoder.Decode(&res)
if err != nil {
if _, ok := err.(*json.SyntaxError); ok {
bufferReader := decoder.Buffered()
readBytes, err := ioutil.ReadAll(bufferReader)
if err != nil {
log.Errorf("runner[%v] Reader %q read decoder buffered error: %v", ssr.meta.RunnerName, ssr.Name(), err)
} else {
log.Infof("runner[%v] Reader %q read streaming message:{ %v }, will combine it to next json decoder", ssr.meta.RunnerName, ssr.Name(), TruncateStrSize(string(readBytes), 2048))
}
decoder = json.NewDecoder(bufioReader)
time.Sleep(time.Second)
continue
}
if netErr, ok := err.(net.Error); ok && netErr.Timeout() {
if !tryDecodeReader(decoder) {
decoder = json.NewDecoder(bufioReader)
}
time.Sleep(time.Second)
continue
} else {
log.Errorf("runner[%v] Reader %q tcp reader error %v", ssr.meta.RunnerName, ssr.Name(), err)
return
}
}
bytes, err := jsoniter.Marshal(res)
if err != nil {
log.Errorf("runner[%v] Reader %q json marshal error %v", ssr.meta.RunnerName, ssr.Name(), err)
return
}
ssr.sendReadChan(address, string(bytes))
}
}
type packetSocketReader struct {
PacketConn net.PacketConn
*Reader
}
func (psr *packetSocketReader) listen() {
buf := make([]byte, 64*1024) // 64kb - maximum size of IP packet
defer func() {
if atomic.CompareAndSwapInt32(&psr.status, StatusStopping, StatusStopped) {
close(psr.readChan)
close(psr.errChan)
}
}()
for {
if atomic.LoadInt32(&psr.status) == StatusStopped || atomic.LoadInt32(&psr.status) == StatusStopping {
return
}
n, remoteAddr, err := psr.PacketConn.ReadFrom(buf)
if err != nil {
if !strings.HasSuffix(err.Error(), ": use of closed network connection") {
log.Errorf("runner[%v]: error %v", psr.Name(), err)
}
psr.sendError(err)
break
}
var address string
// get remote addr
if remoteAddr != nil && len(remoteAddr.String()) != 0 {
address = remoteAddr.String()
}
// if remote addr is empty, get local addr
if len(address) == 0 {
if localAddr := psr.PacketConn.LocalAddr(); localAddr != nil {
address = localAddr.String()
}
}
val := string(buf[:n])
if psr.IsSplitByLine || psr.SocketRule == SocketRuleLine {
vals := strings.Split(val, "\n")
for _, value := range vals {
if value = strings.TrimSpace(value); value != "" {
psr.sendReadChan(address, value)
}
}
} else {
psr.sendReadChan(address, val)
}
}
}
func init() {
reader.RegisterConstructor(ModeSocket, NewReader)
}
type Reader struct {
meta *reader.Meta
// Note: 原子操作,用于表示 reader 整体的运行状态
status int32
readChan chan socketInfo
errChan chan error
initErr error
initErrLock sync.RWMutex
netproto string
ServiceAddress string
sourceIp string
MaxConnections int
ReadBufferSize int
ReadTimeout time.Duration
KeepAlivePeriod time.Duration
IsSplitByLine bool
SocketRule string
HeadPattern *regexp.Regexp
decoder mahonia.Decoder
closer io.Closer
}
func NewReader(meta *reader.Meta, conf conf.MapConf) (reader.Reader, error) {
ServiceAddress, err := conf.GetString(KeySocketServiceAddress)
if err != nil {
return nil, err
}
MaxConnections, _ := conf.GetIntOr(KeySocketMaxConnections, 0)
ReadTimeout, _ := conf.GetStringOr(KeySocketReadTimeout, "0")
ReadTimeoutdur, err := time.ParseDuration(ReadTimeout)
if err != nil {
return nil, err
}
ReadBufferSize, _ := conf.GetIntOr(KeySocketReadBufferSize, 65535)
KeepAlivePeriod, _ := conf.GetStringOr(KeySocketKeepAlivePeriod, "5m")
KeepAlivePeriodDur, err := time.ParseDuration(KeepAlivePeriod)
if err != nil {
return nil, err
}
IsSplitByLine, _ := conf.GetBoolOr(KeySocketSplitByLine, false)
socketRule, _ := conf.GetStringOr(KeySocketRule, SocketRulePacket)
var headPattern *regexp.Regexp
if socketRule == SocketRuleHeadPattern {
patternStr, _ := conf.GetStringOr(KeySocketRuleHeadPattern, "*")
headPattern, err = regexp.Compile(patternStr)
if err != nil {
err = fmt.Errorf("head pattern %v compile error %v", patternStr, err)
return nil, err
}
}
var decoder mahonia.Decoder
encoding, _ := conf.GetStringOr(KeyEncoding, "")
encoding = strings.ToUpper(encoding)
if encoding != DefaultEncodingWay {
decoder = mahonia.NewDecoder(encoding)
if decoder == nil {
log.Warnf("Encoding Way [%v] is not supported, will read as utf-8", encoding)
}
}
return &Reader{
meta: meta,
status: StatusInit,
readChan: make(chan socketInfo, 2),
errChan: make(chan error),
initErrLock: sync.RWMutex{},
ServiceAddress: ServiceAddress,
MaxConnections: MaxConnections,
ReadBufferSize: ReadBufferSize,
ReadTimeout: ReadTimeoutdur,
KeepAlivePeriod: KeepAlivePeriodDur,
IsSplitByLine: IsSplitByLine,
SocketRule: socketRule,
HeadPattern: headPattern,
decoder: decoder,
}, nil
}
func (r *Reader) isStopping() bool {
return atomic.LoadInt32(&r.status) == StatusStopping
}
func (r *Reader) hasStopped() bool {
return atomic.LoadInt32(&r.status) == StatusStopped
}
func (r *Reader) Name() string {
return "SocketReader<" + r.ServiceAddress + ">"
}
func (*Reader) SetMode(_ string, _ interface{}) error {
return errors.New("socket reader does not support read mode")
}
func (r *Reader) sendError(err error) {
if err == nil {
return
}
defer func() {
if rec := recover(); rec != nil {
log.Errorf("runner[%v] Reader %q panic and was recovered from %v", r.meta.RunnerName, r.Name(), rec)
}
}()
if atomic.LoadInt32(&r.status) == StatusStopped || atomic.LoadInt32(&r.status) == StatusStopping {
return
}
r.errChan <- err
}
func (r *Reader) sendReadChan(address string, value string) {
defer func() {
if rec := recover(); rec != nil {
log.Errorf("runner[%v] Reader %q panic and was recovered from %v", r.meta.RunnerName, r.Name(), rec)
}
}()
if atomic.LoadInt32(&r.status) == StatusStopped || atomic.LoadInt32(&r.status) == StatusStopping {
return
}
r.readChan <- socketInfo{address: address, data: value}
}
func (r *Reader) Start() (err error) {
defer func() {
r.initErrLock.Lock()
r.initErr = err
r.initErrLock.Unlock()
}()
if r.isStopping() || r.hasStopped() {
return errors.New("reader is stopping or has stopped")
} else if !atomic.CompareAndSwapInt32(&r.status, StatusInit, StatusRunning) {
log.Warnf("Runner[%v] %q daemon has already started and is running", r.meta.RunnerName, r.Name())
return nil
}
spl := strings.SplitN(r.ServiceAddress, "://", 2)
if len(spl) != 2 {
return fmt.Errorf("invalid service address: %s", r.ServiceAddress)
}
r.netproto = spl[0]
if spl[0] == "unix" || spl[0] == "unixpacket" || spl[0] == "unixgram" {
// 通过remove来检测套接字文件是否存在
os.Remove(spl[1])
}
switch spl[0] {
case "tcp", "tcp4", "tcp6", "unix", "unixpacket":
l, err := net.Listen(spl[0], spl[1])
if err != nil {
return err
}
if r.ReadBufferSize > 0 {
if srb, ok := l.(setReadBufferer); ok {
srb.SetReadBuffer(r.ReadBufferSize)
} else {
log.Warnf("Unable to set read buffer on a %s socket", spl[0])
}
}
ssr := &streamSocketReader{
Listener: l,
Reader: r,
}
r.closer = l
go ssr.listen()
case "udp", "udp4", "udp6", "ip", "ip4", "ip6", "unixgram":
pc, err := net.ListenPacket(spl[0], spl[1])
if err != nil {
return err
}
r.readChan = make(chan socketInfo, 100)
if r.ReadBufferSize > 0 {
if srb, ok := pc.(setReadBufferer); ok {
srb.SetReadBuffer(r.ReadBufferSize)
} else {
log.Warnf("Unable to set read buffer on a %s socket", spl[0])
}
}
psr := &packetSocketReader{
PacketConn: pc,
Reader: r,
}
r.closer = pc
go psr.listen()
default:
return fmt.Errorf("unknown protocol '%s' in '%s'", spl[0], r.ServiceAddress)
}
if spl[0] == "unix" || spl[0] == "unixpacket" || spl[0] == "unixgram" {
r.closer = unixCloser{path: spl[1], closer: r.closer}
}
return nil
}
func (r *Reader) Source() string {
return r.sourceIp
}
func (r *Reader) FetchInitError() error {
r.initErrLock.RLock()
defer r.initErrLock.RUnlock()
return r.initErr
}
// Note: 对 sourceIp 的操作非线程安全,需由上层逻辑保证同步调用 ReadLine
func (r *Reader) ReadLine() (string, error) {
timer := time.NewTimer(time.Second)
defer timer.Stop()
select {
case info := <-r.readChan:
r.sourceIp = info.address
return r.readString(info.data), nil
case err := <-r.errChan:
return "", err
case <-timer.C:
}
return "", r.FetchInitError()
}
// ReadString reads until the first occurrence of delim in the input,
// returning a string containing the data up to and including the delimiter.
// If ReadString encounters an error before finding a delimiter,
// it returns the data read before the error and the error itself (often io.EOF).
// ReadString returns err != nil if and only if the returned data does not end in
// delim.
// For simple uses, a Scanner may be more convenient.
func (r *Reader) readString(ret string) string {
//默认都是utf-8
if r.decoder != nil {
ret = r.decoder.ConvertString(ret)
}
return ret
}
func (r *Reader) SyncMeta() {
//FIXME 网络监听存在丢包可能性,无法保证不丢包
}
func (r *Reader) Close() error {
if !atomic.CompareAndSwapInt32(&r.status, StatusRunning, StatusStopping) {
log.Warnf("Runner[%v] reader %q is not running, close operation ignored", r.meta.RunnerName, r.Name())
return nil
}
log.Debugf("Runner[%v] %q daemon is stopping", r.meta.RunnerName, r.Name())
var err error
if r.closer != nil {
err = r.closer.Close()
r.closer = nil
// Make a connection meant to fail but unblock and release the port
net.Dial(r.netproto, r.ServiceAddress)
}
atomic.StoreInt32(&r.status, StatusStopped)
log.Infof("Runner[%v] %q daemon has stopped from running", r.meta.RunnerName, r.Name())
return err
}
type unixCloser struct {
path string
closer io.Closer
}
func (uc unixCloser) Close() error {
err := uc.closer.Close()
os.Remove(uc.path) // ignore error
return err
}
func tryDecodeReader(decoder *json.Decoder) bool {
bufferReader := decoder.Buffered()
readBytes, err := ioutil.ReadAll(bufferReader)
if err == io.EOF {
return false
}
if err != nil {
log.Errorf("decode buffered read error: %v", err)
return true
}
if len(strings.TrimSpace(string(readBytes))) <= 0 {
return false
}
return true
}