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/*
* Copyright (C) 2017 "IoT.bzh"
* Author Sebastien Douheret <sebastien@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package agent
import (
"fmt"
"log"
"os"
"os/exec"
"os/signal"
"path/filepath"
"syscall"
"time"
"github.com/Sirupsen/logrus"
"github.com/iotbzh/xds-agent/lib/syncthing"
"github.com/iotbzh/xds-agent/lib/xdsconfig"
"github.com/urfave/cli"
)
const cookieMaxAge = "3600"
// Context holds the Agent context structure
type Context struct {
ProgName string
Config *xdsconfig.Config
Log *logrus.Logger
LogLevelSilly bool
SThg *st.SyncThing
SThgCmd *exec.Cmd
SThgInotCmd *exec.Cmd
webServer *WebServer
xdsServers map[string]*XdsServer
sessions *Sessions
events *Events
projects *Projects
Exit chan os.Signal
}
// NewAgent Create a new instance of Agent
func NewAgent(cliCtx *cli.Context) *Context {
var err error
// Set logger level and formatter
log := cliCtx.App.Metadata["logger"].(*logrus.Logger)
logLevel := cliCtx.GlobalString("log")
if logLevel == "" {
logLevel = "error" // FIXME get from Config DefaultLogLevel
}
if log.Level, err = logrus.ParseLevel(logLevel); err != nil {
fmt.Printf("Invalid log level : \"%v\"\n", logLevel)
os.Exit(1)
}
log.Formatter = &logrus.TextFormatter{}
sillyVal, sillyLog := os.LookupEnv("XDS_LOG_SILLY")
// Define default configuration
ctx := Context{
ProgName: cliCtx.App.Name,
Log: log,
LogLevelSilly: (sillyLog && sillyVal == "1"),
Exit: make(chan os.Signal, 1),
webServer: nil,
xdsServers: make(map[string]*XdsServer),
events: nil,
}
// register handler on SIGTERM / exit
signal.Notify(ctx.Exit, os.Interrupt, syscall.SIGTERM)
go handlerSigTerm(&ctx)
return &ctx
}
// Run Main function called to run agent
func (ctx *Context) Run() (int, error) {
var err error
// Logs redirected into a file when logfile option or logsDir config is set
ctx.Config.LogVerboseOut = os.Stderr
if ctx.Config.FileConf.LogsDir != "" {
if ctx.Config.Options.LogFile != "stdout" {
logFile := ctx.Config.Options.LogFile
fdL, err := os.OpenFile(logFile, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
if err != nil {
msgErr := fmt.Errorf("Cannot create log file %s", logFile)
return int(syscall.EPERM), msgErr
}
ctx.Log.Out = fdL
ctx._logPrint("Logging file: %s\n", logFile)
}
logFileHTTPReq := filepath.Join(ctx.Config.FileConf.LogsDir, "xds-agent-verbose.log")
fdLH, err := os.OpenFile(logFileHTTPReq, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0666)
if err != nil {
msgErr := fmt.Errorf("Cannot create log file %s", logFileHTTPReq)
return int(syscall.EPERM), msgErr
}
ctx.Config.LogVerboseOut = fdLH
ctx._logPrint("Logging file for HTTP requests: %s\n", logFileHTTPReq)
}
// Create syncthing instance when section "syncthing" is present in config.json
if ctx.Config.FileConf.SThgConf != nil {
ctx.SThg = st.NewSyncThing(ctx.Config, ctx.Log)
}
// Start local instance of Syncthing and Syncthing-notify
if ctx.SThg != nil {
ctx.Log.Infof("Starting Syncthing...")
ctx.SThgCmd, err = ctx.SThg.Start()
if err != nil {
return 2, err
}
fmt.Printf("Syncthing started (PID %d)\n", ctx.SThgCmd.Process.Pid)
ctx.Log.Infof("Starting Syncthing-inotify...")
ctx.SThgInotCmd, err = ctx.SThg.StartInotify()
if err != nil {
return 2, err
}
fmt.Printf("Syncthing-inotify started (PID %d)\n", ctx.SThgInotCmd.Process.Pid)
// Establish connection with local Syncthing (retry if connection fail)
time.Sleep(3 * time.Second)
maxRetry := 30
retry := maxRetry
for retry > 0 {
if err := ctx.SThg.Connect(); err == nil {
break
}
ctx.Log.Infof("Establishing connection to Syncthing (retry %d/%d)", retry, maxRetry)
time.Sleep(time.Second)
retry--
}
if err != nil || retry == 0 {
return 2, err
}
// Retrieve Syncthing config
id, err := ctx.SThg.IDGet()
if err != nil {
return 2, err
}
ctx.Log.Infof("Local Syncthing ID: %s", id)
} else {
ctx.Log.Infof("Cloud Sync / Syncthing not supported")
}
// Create Web Server
ctx.webServer = NewWebServer(ctx)
// Sessions manager
ctx.sessions = NewClientSessions(ctx, cookieMaxAge)
// Create events management
ctx.events = NewEvents(ctx)
// Create projects management
ctx.projects = NewProjects(ctx, ctx.SThg)
// Run Web Server until exit requested (blocking call)
if err = ctx.webServer.Serve(); err != nil {
log.Println(err)
return 3, err
}
return 4, fmt.Errorf("Program exited")
}
// Helper function to log message on both stdout and logger
func (ctx *Context) _logPrint(format string, args ...interface{}) {
fmt.Printf(format, args...)
if ctx.Log.Out != os.Stdout {
ctx.Log.Infof(format, args...)
}
}
// Handle exit and properly stop/close all stuff
func handlerSigTerm(ctx *Context) {
<-ctx.Exit
if ctx.SThg != nil {
ctx.Log.Infof("Stoping Syncthing... (PID %d)",
ctx.SThgCmd.Process.Pid)
ctx.Log.Infof("Stoping Syncthing-inotify... (PID %d)",
ctx.SThgInotCmd.Process.Pid)
ctx.SThg.Stop()
ctx.SThg.StopInotify()
}
if ctx.webServer != nil {
ctx.Log.Infof("Stoping Web server...")
ctx.webServer.Stop()
}
os.Exit(1)
}
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