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//
// sfive
//
// sfive - spreadspace streaming statistics suite is a generic
// statistic collection tool for streaming server infrastuctures.
// The system collects and stores meta data like number of views
// and throughput from a number of streaming servers and stores
// it in a global data store.
// The data acquisition is designed to be generic and extensible in
// order to support different streaming software.
// sfive also contains tools and applications to filter and visualize
// live and recorded data.
//
//
// Copyright (C) 2014-2017 Christian Pointner <equinox@spreadspace.org>
// Markus Grüneis <gimpf@gimpf.org>
//
// This file is part of sfive.
//
// sfive is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License version 3
// as published by the Free Software Foundation.
//
// sfive is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with sfive. If not, see <http://www.gnu.org/licenses/>.
//
package sfive
import (
"context"
"io"
"net"
"strings"
"sync"
"time"
)
func (srv *Server) pipeRead(dec Decoder, updateCH chan<- *UpdateFull, errorCH chan<- error) {
for {
update, err := dec.Decode()
if err != nil {
if err == io.EOF {
close(updateCH)
return
}
opErr, isOpErr := err.(*net.OpError)
if isOpErr && opErr.Temporary() {
continue
}
errorCH <- err
return
}
updateCH <- update
}
}
func (srv *Server) pipeHandle(conn net.Conn, quit <-chan bool) {
defer conn.Close()
conn.SetReadDeadline(time.Now().Add(10 * time.Second))
dec, err := NewStatefulDecoder(conn)
if err != nil {
s5l.Printf("srv|pipe: read(init) failed: %v\n", err)
return
}
conn.SetReadDeadline(time.Time{})
slug := dec.Slug()
s5l.Printf("srv|pipe: new connection: %s\n", slug)
defer s5l.Printf("srv|pipe(%s): connection closed\n", slug)
updateCH := make(chan *UpdateFull)
errorCH := make(chan error)
go srv.pipeRead(dec, updateCH, errorCH)
for {
select {
case update := <-updateCH:
if update == nil {
return
}
if err = srv.Ingest(update); err != nil {
s5l.Printf("srv|pipe(%s): storing data failed: %v\n", slug, err)
// TODO: send NACK
return
}
// TODO: send ACK
case err := <-errorCH:
s5l.Printf("srv|pipe(%s): read(data) failed: %v\n", slug, err)
return
case <-quit:
return
}
}
}
func (srv *Server) pipeRun() {
wgClients := &sync.WaitGroup{}
quit := make(chan bool)
for {
conn, err := srv.interfaces.pipe.Accept()
if err != nil {
if strings.Contains(err.Error(), "use of closed network connection") { // TODO: is this really the best way to do this?
break
}
s5l.Printf("srv|pipe: accept() failed: %v", err)
// TODO: ignore ... or is this permanent?
continue
}
wgClients.Add(1)
go func() {
defer wgClients.Done()
srv.pipeHandle(conn, quit)
}()
}
s5l.Println("srv|pipe: interface stopped listening")
close(quit)
wgClients.Wait()
}
func (srv *Server) pipeStop(ctx context.Context) (err error) {
if srv.interfaces.pipe == nil {
return nil
}
s5l.Printf("srv|pipe: shutting down")
return srv.interfaces.pipe.Close()
}
func (srv *Server) ServePipe(cfg PipeInterfaceConfig) (err error) {
if srv.interfaces.pipe, err = net.Listen("unix", cfg.ListenPath); err != nil {
s5l.Printf("srv|pipe: listen() failed: %v", err)
return
}
s5l.Printf("srv|pipe: listening on '%s'", cfg.ListenPath)
srv.wgInterfaces.Add(1)
go func() {
defer srv.wgInterfaces.Done()
srv.pipeRun()
}()
return
}
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