62b8a897e3
- Rowcopy time is bounded by copy end-time - Retries are configurable via `--default-retries` (default: `60`) - `migrator` notes the hostname - `applier` and `inspector` note `impliedKey` (`@@hostname` and `@@port`) - Added lots of code comments - Adding documentation for "triggerless design"
94 lines
2.1 KiB
Go
94 lines
2.1 KiB
Go
/*
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Copyright 2016 GitHub Inc.
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See https://github.com/github/gh-ost/blob/master/LICENSE
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*/
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package logic
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import (
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"bufio"
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"fmt"
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"net"
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"os"
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"github.com/github/gh-ost/go/base"
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"github.com/outbrain/golib/log"
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)
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type onCommandFunc func(command string, writer *bufio.Writer) error
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// Server listens for requests on a socket file or via TCP
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type Server struct {
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migrationContext *base.MigrationContext
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unixListener net.Listener
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tcpListener net.Listener
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onCommand onCommandFunc
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}
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func NewServer(onCommand onCommandFunc) *Server {
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return &Server{
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migrationContext: base.GetMigrationContext(),
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onCommand: onCommand,
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}
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}
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func (this *Server) BindSocketFile() (err error) {
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if this.migrationContext.ServeSocketFile == "" {
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return nil
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}
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if base.FileExists(this.migrationContext.ServeSocketFile) {
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os.Remove(this.migrationContext.ServeSocketFile)
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}
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this.unixListener, err = net.Listen("unix", this.migrationContext.ServeSocketFile)
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if err != nil {
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return err
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}
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log.Infof("Listening on unix socket file: %s", this.migrationContext.ServeSocketFile)
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return nil
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}
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func (this *Server) BindTCPPort() (err error) {
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if this.migrationContext.ServeTCPPort == 0 {
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return nil
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}
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this.tcpListener, err = net.Listen("tcp", fmt.Sprintf(":%d", this.migrationContext.ServeTCPPort))
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if err != nil {
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return err
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}
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log.Infof("Listening on tcp port: %d", this.migrationContext.ServeTCPPort)
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return nil
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}
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// Serve begins listening & serving on whichever device was configured
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func (this *Server) Serve() (err error) {
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go func() {
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for {
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conn, err := this.unixListener.Accept()
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if err != nil {
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log.Errore(err)
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}
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go this.handleConnection(conn)
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}
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}()
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go func() {
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if this.tcpListener == nil {
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return
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}
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for {
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conn, err := this.tcpListener.Accept()
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if err != nil {
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log.Errore(err)
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}
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go this.handleConnection(conn)
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}
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}()
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return nil
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}
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func (this *Server) handleConnection(conn net.Conn) (err error) {
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defer conn.Close()
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command, _, err := bufio.NewReader(conn).ReadLine()
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return this.onCommand(string(command), bufio.NewWriter(conn))
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}
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