func initContext() (err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("initContext() -> %v", e)
}
}()
ctx.Channels.Log = make(chan mig.Log, 37)
ctx.Logging, err = getLoggingConf()
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
ctx.Logging, err = mig.InitLogger(ctx.Logging, "mig-loader")
if err != nil {
fmt.Fprintf(os.Stderr, "%v\n", err)
os.Exit(1)
}
wg.Add(1)
go func() {
var stop bool
for event := range ctx.Channels.Log {
// Also write the message to stderr to ease debugging
fmt.Fprintf(os.Stderr, "%v\n", event.Desc)
stop, err = mig.ProcessLog(ctx.Logging, event)
if err != nil {
panic("unable to process log")
}
if stop {
break
}
}
wg.Done()
}()
logInfo("logging routine started")
ctx.LoaderKey = LOADERKEY
hints := agentcontext.AgentContextHints{
DiscoverPublicIP: DISCOVERPUBLICIP,
DiscoverAWSMeta: DISCOVERAWSMETA,
APIUrl: APIURL,
Proxies: PROXIES[:],
}
actx, err := agentcontext.NewAgentContext(ctx.Channels.Log, hints)
if err != nil {
panic(err)
}
ctx.AgentIdentifier = actx.ToAgent()
return
}
func refreshAgentEnvironment(ctx *Context) {
for {
time.Sleep(REFRESHENV)
ctx.Channels.Log <- mig.Log{Desc: "refreshing agent environment"}.Info()
ctx.Agent.Lock()
hints := agentcontext.AgentContextHints{
DiscoverPublicIP: DISCOVERPUBLICIP,
DiscoverAWSMeta: DISCOVERAWSMETA,
APIUrl: APIURL,
Proxies: PROXIES[:],
}
actx, err := agentcontext.NewAgentContext(ctx.Channels.Log, hints)
if err != nil {
ctx.Channels.Log <- mig.Log{Desc: fmt.Sprintf("error obtaining new agent context: %v", err)}.Err()
} else {
if ctx.updateVolatileFromAgentContext(actx) {
ctx.Channels.Log <- mig.Log{Desc: "agent environment has changed"}.Info()
}
}
ctx.Agent.Unlock()
}
}
// Init prepare the AMQP connections to the broker and launches the
// goroutines that will process commands received by the MIG Scheduler
func Init(foreground, upgrade bool) (ctx Context, err error) {
defer func() {
if e := recover(); e != nil {
err = fmt.Errorf("initAgent() -> %v", e)
}
if ctx.Channels.Log != nil {
ctx.Channels.Log <- mig.Log{Desc: "leaving initAgent()"}.Debug()
}
}()
// Pick up a lock on Context Agent field as we will be updating or reading it here and in
// various functions called from here such as daemonize().
ctx.Agent.Lock()
defer ctx.Agent.Unlock()
ctx.Agent.Tags = TAGS
ctx.Logging, err = mig.InitLogger(LOGGINGCONF, "mig-agent")
if err != nil {
panic(err)
}
// create the go channels
ctx, err = initChannels(ctx)
if err != nil {
panic(err)
}
// Logging GoRoutine,
go func() {
for event := range ctx.Channels.Log {
_, err := mig.ProcessLog(ctx.Logging, event)
if err != nil {
fmt.Println("Unable to process logs")
}
}
}()
ctx.Channels.Log <- mig.Log{Desc: "Logging routine initialized."}.Debug()
// Gather new agent context information to use as the context for this
// agent invocation
hints := agentcontext.AgentContextHints{
DiscoverPublicIP: DISCOVERPUBLICIP,
DiscoverAWSMeta: DISCOVERAWSMETA,
APIUrl: APIURL,
Proxies: PROXIES[:],
}
actx, err := agentcontext.NewAgentContext(ctx.Channels.Log, hints)
if err != nil {
panic(err)
}
// defines whether the agent should respawn itself or not
// this value is overriden in the daemonize calls if the agent
// is controlled by systemd, upstart or launchd
ctx.Agent.Respawn = ISIMMORTAL
// Do initial assignment of values which could change over the lifetime
// of the agent process
ctx.updateVolatileFromAgentContext(actx)
// Set some other values obtained from the agent context which will not
// change while the process is running.
ctx.Agent.RunDir = actx.RunDir
ctx.Agent.BinPath = actx.BinPath
// get the agent ID
ctx, err = initAgentID(ctx)
if err != nil {
panic(err)
}
// build the agent message queue location
ctx.Agent.QueueLoc = fmt.Sprintf("%s.%s", ctx.Agent.Env.OS, ctx.Agent.UID)
// daemonize if not in foreground mode
if !foreground {
// give one second for the caller to exit
time.Sleep(time.Second)
ctx, err = daemonize(ctx, upgrade)
if err != nil {
panic(err)
}
}
ctx.Sleeper = HEARTBEATFREQ
if err != nil {
panic(err)
}
// parse the ACLs
ctx, err = initACL(ctx)
if err != nil {
panic(err)
}
connected := false
// connect to the message broker
//
// If any proxies have been configured, we try to use those first. If they fail, or
// no proxies have been setup, just attempt a direct connection.
for _, proxy := range PROXIES {
ctx.Channels.Log <- mig.Log{Desc: fmt.Sprintf("Trying proxy %v for relay connection", proxy)}.Debug()
ctx, err = initMQ(ctx, true, proxy)
if err != nil {
ctx.Channels.Log <- mig.Log{Desc: fmt.Sprintf("Failed to connect to relay using proxy %s: '%v'", proxy, err)}.Info()
continue
}
connected = true
goto mqdone
}
// Try and proxy that has been specified in the environment
ctx.Channels.Log <- mig.Log{Desc: "Trying proxies from environment for relay connection"}.Debug()
ctx, err = initMQ(ctx, true, "")
if err == nil {
connected = true
goto mqdone
} else {
ctx.Channels.Log <- mig.Log{Desc: fmt.Sprintf("Failed to connect to relay using HTTP_PROXY: '%v'", err)}.Info()
}
// Fall back to a direct connection
ctx.Channels.Log <- mig.Log{Desc: "Trying direct relay connection"}.Debug()
ctx, err = initMQ(ctx, false, "")
if err == nil {
connected = true
} else {
ctx.Channels.Log <- mig.Log{Desc: fmt.Sprintf("Failed to connect to relay directly: '%v'", err)}.Info()
}
mqdone:
if !connected {
panic("Failed to connect to the relay")
}
// catch interrupts
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt)
go func() {
sig := <-c
ctx.Channels.Terminate <- sig.String()
}()
// try to connect the stat socket until it works
// this may fail if one agent is already running
if SOCKET != "" {
go func() {
for {
ctx.Socket.Bind = SOCKET
ctx, err = initSocket(ctx)
if err == nil {
ctx.Channels.Log <- mig.Log{Desc: fmt.Sprintf("Stat socket connected successfully on %s", ctx.Socket.Bind)}.Info()
goto socketdone
}
ctx.Channels.Log <- mig.Log{Desc: fmt.Sprintf("Failed to connect stat socket: '%v'", err)}.Err()
time.Sleep(60 * time.Second)
}
socketdone:
return
}()
}
return
}