nsqlookup_protocol_v1.go
Posted 张伯雨
tags:
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package nsqlookupd
import (
"bufio"
"encoding/binary"
"encoding/json"
"fmt"
"io"
"log"
"net"
"os"
"strings"
"sync/atomic"
"time"
"github.com/nsqio/nsq/internal/protocol"
"github.com/nsqio/nsq/internal/version"
)type LookupProtocolV1 struct {
ctx *Context
}func (p *LookupProtocolV1) IOLoop(conn net.Conn) error {
var err error
var line string
client := NewClientV1(conn)
reader := bufio.NewReader(client)
for {
line, err = reader.ReadString(‘\n‘)
if err != nil {
break
}
line = strings.TrimSpace(line)
params := strings.Split(line, " ")
var response []byte
response, err = p.Exec(client, reader, params)
if err != nil {
ctx := ""
if parentErr := err.(protocol.ChildErr).Parent(); parentErr != nil {
ctx = " - " + parentErr.Error()
}
p.ctx.nsqlookupd.logf("ERROR: [%s] - %s%s", client, err, ctx)
_, sendErr := protocol.SendResponse(client, []byte(err.Error()))
if sendErr != nil {
p.ctx.nsqlookupd.logf("ERROR: [%s] - %s%s", client, sendErr, ctx)
break
}
// errors of type FatalClientErr should forceably close the connection
if _, ok := err.(*protocol.FatalClientErr); ok {
break
}
continue
}
if response != nil {
_, err = protocol.SendResponse(client, response)
if err != nil {
break
}
}
}
conn.Close()
p.ctx.nsqlookupd.logf("CLIENT(%s): closing", client)
if client.peerInfo != nil {
registrations := p.ctx.nsqlookupd.DB.LookupRegistrations(client.peerInfo.id)
for _, r := range registrations {
if removed, _ := p.ctx.nsqlookupd.DB.RemoveProducer(r, client.peerInfo.id); removed {
p.ctx.nsqlookupd.logf("DB: client(%s) UNREGISTER category:%s key:%s subkey:%s",
client, r.Category, r.Key, r.SubKey)
}
}
}
return err
}func (p *LookupProtocolV1) Exec(client *ClientV1, reader *bufio.Reader, params []string) ([]byte, error) {
switch params[0] {
case "PING":
return p.PING(client, params)
case "IDENTIFY":
return p.IDENTIFY(client, reader, params[1:])
case "REGISTER":
return p.REGISTER(client, reader, params[1:])
case "UNREGISTER":
return p.UNREGISTER(client, reader, params[1:])
}
return nil, protocol.NewFatalClientErr(nil, "E_INVALID", fmt.Sprintf("invalid command %s", params[0]))
}func getTopicChan(command string, params []string) (string, string, error) {
if len(params) == 0 {
return "", "", protocol.NewFatalClientErr(nil, "E_INVALID", fmt.Sprintf("%s insufficient number of params", command))
}
topicName := params[0]
var channelName string
if len(params) >= 2 {
channelName = params[1]
}
if !protocol.IsValidTopicName(topicName) {
return "", "", protocol.NewFatalClientErr(nil, "E_BAD_TOPIC", fmt.Sprintf("%s topic name ‘%s‘ is not valid", command, topicName))
}
if channelName != "" && !protocol.IsValidChannelName(channelName) {
return "", "", protocol.NewFatalClientErr(nil, "E_BAD_CHANNEL", fmt.Sprintf("%s channel name ‘%s‘ is not valid", command, channelName))
}
return topicName, channelName, nil
}func (p *LookupProtocolV1) REGISTER(client *ClientV1, reader *bufio.Reader, params []string) ([]byte, error) {
if client.peerInfo == nil {
return nil, protocol.NewFatalClientErr(nil, "E_INVALID", "client must IDENTIFY")
}
topic, channel, err := getTopicChan("REGISTER", params)
if err != nil {
return nil, err
}
if channel != "" {
key := Registration{"channel", topic, channel}
if p.ctx.nsqlookupd.DB.AddProducer(key, &Producer{peerInfo: client.peerInfo}) {
p.ctx.nsqlookupd.logf("DB: client(%s) REGISTER category:%s key:%s subkey:%s",
client, "channel", topic, channel)
}
}
key := Registration{"topic", topic, ""}
if p.ctx.nsqlookupd.DB.AddProducer(key, &Producer{peerInfo: client.peerInfo}) {
p.ctx.nsqlookupd.logf("DB: client(%s) REGISTER category:%s key:%s subkey:%s",
client, "topic", topic, "")
}
return []byte("OK"), nil
}func (p *LookupProtocolV1) UNREGISTER(client *ClientV1, reader *bufio.Reader, params []string) ([]byte, error) {
if client.peerInfo == nil {
return nil, protocol.NewFatalClientErr(nil, "E_INVALID", "client must IDENTIFY")
}
topic, channel, err := getTopicChan("UNREGISTER", params)
if err != nil {
return nil, err
}
if channel != "" {
key := Registration{"channel", topic, channel}
removed, left := p.ctx.nsqlookupd.DB.RemoveProducer(key, client.peerInfo.id)
if removed {
p.ctx.nsqlookupd.logf("DB: client(%s) UNREGISTER category:%s key:%s subkey:%s",
client, "channel", topic, channel)
}
// for ephemeral channels, remove the channel as well if it has no producers
if left == 0 && strings.HasSuffix(channel, "#ephemeral") {
p.ctx.nsqlookupd.DB.RemoveRegistration(key)
}
} else {
// no channel was specified so this is a topic unregistration
// remove all of the channel registrations...
// normally this shouldn‘t happen which is why we print a warning message
// if anything is actually removed
registrations := p.ctx.nsqlookupd.DB.FindRegistrations("channel", topic, "*")
for _, r := range registrations {
if removed, _ := p.ctx.nsqlookupd.DB.RemoveProducer(r, client.peerInfo.id); removed {
p.ctx.nsqlookupd.logf("WARNING: client(%s) unexpected UNREGISTER category:%s key:%s subkey:%s",
client, "channel", topic, r.SubKey)
}
}
key := Registration{"topic", topic, ""}
if removed, _ := p.ctx.nsqlookupd.DB.RemoveProducer(key, client.peerInfo.id); removed {
p.ctx.nsqlookupd.logf("DB: client(%s) UNREGISTER category:%s key:%s subkey:%s",
client, "topic", topic, "")
}
}
return []byte("OK"), nil
}func (p *LookupProtocolV1) IDENTIFY(client *ClientV1, reader *bufio.Reader, params []string) ([]byte, error) {
var err error
if client.peerInfo != nil {
return nil, protocol.NewFatalClientErr(err, "E_INVALID", "cannot IDENTIFY again")
}
var bodyLen int32
err = binary.Read(reader, binary.BigEndian, &bodyLen)
if err != nil {
return nil, protocol.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to read body size")
}
body := make([]byte, bodyLen)
_, err = io.ReadFull(reader, body)
if err != nil {
return nil, protocol.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to read body")
}
// body is a json structure with producer information
peerInfo := PeerInfo{id: client.RemoteAddr().String()}
err = json.Unmarshal(body, &peerInfo)
if err != nil {
return nil, protocol.NewFatalClientErr(err, "E_BAD_BODY", "IDENTIFY failed to decode JSON body")
}
peerInfo.RemoteAddress = client.RemoteAddr().String()
// require all fields
if peerInfo.BroadcastAddress == "" || peerInfo.TCPPort == 0 || peerInfo.HTTPPort == 0 || peerInfo.Version == "" {
return nil, protocol.NewFatalClientErr(nil, "E_BAD_BODY", "IDENTIFY missing fields")
}
atomic.StoreInt64(&peerInfo.lastUpdate, time.Now().UnixNano())
p.ctx.nsqlookupd.logf("CLIENT(%s): IDENTIFY Address:%s TCP:%d HTTP:%d Version:%s",
client, peerInfo.BroadcastAddress, peerInfo.TCPPort, peerInfo.HTTPPort, peerInfo.Version)
client.peerInfo = &peerInfo
if p.ctx.nsqlookupd.DB.AddProducer(Registration{"client", "", ""}, &Producer{peerInfo: client.peerInfo}) {
p.ctx.nsqlookupd.logf("DB: client(%s) REGISTER category:%s key:%s subkey:%s", client, "client", "", "")
}
// build a response
data := make(map[string]interface{})
data["tcp_port"] = p.ctx.nsqlookupd.RealTCPAddr().Port
data["http_port"] = p.ctx.nsqlookupd.RealHTTPAddr().Port
data["version"] = version.Binary
hostname, err := os.Hostname()
if err != nil {
log.Fatalf("ERROR: unable to get hostname %s", err)
}
data["broadcast_address"] = p.ctx.nsqlookupd.opts.BroadcastAddress
data["hostname"] = hostname
response, err := json.Marshal(data)
if err != nil {
p.ctx.nsqlookupd.logf("ERROR: marshaling %v", data)
return []byte("OK"), nil
}
return response, nil
}func (p *LookupProtocolV1) PING(client *ClientV1, params []string) ([]byte, error) {
if client.peerInfo != nil {
// we could get a PING before other commands on the same client connection
cur := time.Unix(0, atomic.LoadInt64(&client.peerInfo.lastUpdate))
now := time.Now()
p.ctx.nsqlookupd.logf("CLIENT(%s): pinged (last ping %s)", client.peerInfo.id,
now.Sub(cur))
atomic.StoreInt64(&client.peerInfo.lastUpdate, now.UnixNano())
}
return []byte("OK"), nil
}以上是关于nsqlookup_protocol_v1.go的主要内容，如果未能解决你的问题，请参考以下文章