// Init initializes the main struct after it performs some validation.
func (obj *Main) Init() error {
if obj.Program == "" || obj.Version == "" {
return fmt.Errorf("You must set the Program and Version strings!")
}
if obj.Prefix != nil && obj.TmpPrefix {
return fmt.Errorf("Choosing a prefix and the request for a tmp prefix is illogical!")
}
obj.idealClusterSize = uint16(obj.IdealClusterSize)
if obj.IdealClusterSize < 0 { // value is undefined, set to the default
obj.idealClusterSize = etcd.DefaultIdealClusterSize
}
if obj.idealClusterSize < 1 {
return fmt.Errorf("IdealClusterSize should be at least one!")
}
if obj.NoServer && len(obj.Remotes) > 0 {
// TODO: in this case, we won't be able to tunnel stuff back to
// here, so if we're okay with every remote graph running in an
// isolated mode, then this is okay. Improve on this if there's
// someone who really wants to be able to do this.
return fmt.Errorf("The Server is required when using Remotes!")
}
if obj.CConns < 0 {
return fmt.Errorf("The CConns value should be at least zero!")
}
if obj.ConvergedTimeout >= 0 && obj.CConns > 0 && len(obj.Remotes) > int(obj.CConns) {
return fmt.Errorf("You can't converge if you have more remotes than available connections!")
}
if obj.Depth < 0 { // user should not be using this argument manually
return fmt.Errorf("Negative values for Depth are not permitted!")
}
// transform the url list inputs into etcd typed lists
var err error
obj.seeds, err = etcdtypes.NewURLs(
util.FlattenListWithSplit(obj.Seeds, []string{",", ";", " "}),
)
if err != nil && len(obj.Seeds) > 0 {
return fmt.Errorf("Seeds didn't parse correctly!")
}
obj.clientURLs, err = etcdtypes.NewURLs(
util.FlattenListWithSplit(obj.ClientURLs, []string{",", ";", " "}),
)
if err != nil && len(obj.ClientURLs) > 0 {
return fmt.Errorf("ClientURLs didn't parse correctly!")
}
obj.serverURLs, err = etcdtypes.NewURLs(
util.FlattenListWithSplit(obj.ServerURLs, []string{",", ";", " "}),
)
if err != nil && len(obj.ServerURLs) > 0 {
return fmt.Errorf("ServerURLs didn't parse correctly!")
}
obj.exit = make(chan error)
return nil
}
// run is the main run target.
func run(c *cli.Context) error {
var start = time.Now().UnixNano()
log.Printf("This is: %v, version: %v", program, version)
log.Printf("Main: Start: %v", start)
hostname, _ := os.Hostname()
// allow passing in the hostname, instead of using --hostname
if c.IsSet("file") {
if config := gconfig.ParseConfigFromFile(c.String("file")); config != nil {
if h := config.Hostname; h != "" {
hostname = h
}
}
}
if c.IsSet("hostname") { // override by cli
if h := c.String("hostname"); h != "" {
hostname = h
}
}
noop := c.Bool("noop")
seeds, err := etcdtypes.NewURLs(
util.FlattenListWithSplit(c.StringSlice("seeds"), []string{",", ";", " "}),
)
if err != nil && len(c.StringSlice("seeds")) > 0 {
log.Printf("Main: Error: seeds didn't parse correctly!")
return cli.NewExitError("", 1)
}
clientURLs, err := etcdtypes.NewURLs(
util.FlattenListWithSplit(c.StringSlice("client-urls"), []string{",", ";", " "}),
)
if err != nil && len(c.StringSlice("client-urls")) > 0 {
log.Printf("Main: Error: clientURLs didn't parse correctly!")
return cli.NewExitError("", 1)
}
serverURLs, err := etcdtypes.NewURLs(
util.FlattenListWithSplit(c.StringSlice("server-urls"), []string{",", ";", " "}),
)
if err != nil && len(c.StringSlice("server-urls")) > 0 {
log.Printf("Main: Error: serverURLs didn't parse correctly!")
return cli.NewExitError("", 1)
}
idealClusterSize := uint16(c.Int("ideal-cluster-size"))
if idealClusterSize < 1 {
log.Printf("Main: Error: idealClusterSize should be at least one!")
return cli.NewExitError("", 1)
}
if c.IsSet("file") && c.IsSet("puppet") {
log.Println("Main: Error: the --file and --puppet parameters cannot be used together!")
return cli.NewExitError("", 1)
}
if c.Bool("no-server") && len(c.StringSlice("remote")) > 0 {
// TODO: in this case, we won't be able to tunnel stuff back to
// here, so if we're okay with every remote graph running in an
// isolated mode, then this is okay. Improve on this if there's
// someone who really wants to be able to do this.
log.Println("Main: Error: the --no-server and --remote parameters cannot be used together!")
return cli.NewExitError("", 1)
}
cConns := uint16(c.Int("cconns"))
if cConns < 0 {
log.Printf("Main: Error: --cconns should be at least zero!")
return cli.NewExitError("", 1)
}
if c.IsSet("converged-timeout") && cConns > 0 && len(c.StringSlice("remote")) > c.Int("cconns") {
log.Printf("Main: Error: combining --converged-timeout with more remotes than available connections will never converge!")
return cli.NewExitError("", 1)
}
depth := uint16(c.Int("depth"))
if depth < 0 { // user should not be using this argument manually
log.Printf("Main: Error: negative values for --depth are not permitted!")
return cli.NewExitError("", 1)
}
if c.IsSet("prefix") && c.Bool("tmp-prefix") {
log.Println("Main: Error: combining --prefix and the request for a tmp prefix is illogical!")
return cli.NewExitError("", 1)
}
if s := c.String("prefix"); c.IsSet("prefix") && s != "" {
prefix = s
}
// make sure the working directory prefix exists
if c.Bool("tmp-prefix") || os.MkdirAll(prefix, 0770) != nil {
if c.Bool("tmp-prefix") || c.Bool("allow-tmp-prefix") {
if prefix, err = ioutil.TempDir("", program+"-"); err != nil {
log.Printf("Main: Error: Can't create temporary prefix!")
return cli.NewExitError("", 1)
}
log.Println("Main: Warning: Working prefix directory is temporary!")
} else {
log.Printf("Main: Error: Can't create prefix!")
return cli.NewExitError("", 1)
}
}
log.Printf("Main: Working prefix is: %s", prefix)
var wg sync.WaitGroup
exit := make(chan bool) // exit signal
var G, fullGraph *pgraph.Graph
// exit after `max-runtime` seconds for no reason at all...
if i := c.Int("max-runtime"); i > 0 {
go func() {
time.Sleep(time.Duration(i) * time.Second)
exit <- true
}()
}
// setup converger
converger := converger.NewConverger(
c.Int("converged-timeout"),
nil, // stateFn gets added in by EmbdEtcd
)
go converger.Loop(true) // main loop for converger, true to start paused
// embedded etcd
if len(seeds) == 0 {
log.Printf("Main: Seeds: No seeds specified!")
} else {
log.Printf("Main: Seeds(%v): %v", len(seeds), seeds)
}
EmbdEtcd := etcd.NewEmbdEtcd(
hostname,
seeds,
clientURLs,
serverURLs,
c.Bool("no-server"),
idealClusterSize,
prefix,
converger,
)
if EmbdEtcd == nil {
// TODO: verify EmbdEtcd is not nil below...
log.Printf("Main: Etcd: Creation failed!")
exit <- true
} else if err := EmbdEtcd.Startup(); err != nil { // startup (returns when etcd main loop is running)
log.Printf("Main: Etcd: Startup failed: %v", err)
exit <- true
}
convergerStateFn := func(b bool) error {
// exit if we are using the converged-timeout and we are the
// root node. otherwise, if we are a child node in a remote
// execution hierarchy, we should only notify our converged
// state and wait for the parent to trigger the exit.
if depth == 0 && c.Int("converged-timeout") >= 0 {
if b {
log.Printf("Converged for %d seconds, exiting!", c.Int("converged-timeout"))
exit <- true // trigger an exit!
}
return nil
}
// send our individual state into etcd for others to see
return etcd.EtcdSetHostnameConverged(EmbdEtcd, hostname, b) // TODO: what should happen on error?
}
if EmbdEtcd != nil {
converger.SetStateFn(convergerStateFn)
}
exitchan := make(chan struct{}) // exit on close
go func() {
startchan := make(chan struct{}) // start signal
go func() { startchan <- struct{}{} }()
file := c.String("file")
var configchan chan bool
var puppetchan <-chan time.Time
if !c.Bool("no-watch") && c.IsSet("file") {
configchan = ConfigWatch(file)
} else if c.IsSet("puppet") {
interval := puppet.PuppetInterval(c.String("puppet-conf"))
puppetchan = time.Tick(time.Duration(interval) * time.Second)
}
log.Println("Etcd: Starting...")
etcdchan := etcd.EtcdWatch(EmbdEtcd)
first := true // first loop or not
for {
log.Println("Main: Waiting...")
select {
case <-startchan: // kick the loop once at start
// pass
case b := <-etcdchan:
if !b { // ignore the message
continue
}
// everything else passes through to cause a compile!
case <-puppetchan:
// nothing, just go on
case msg := <-configchan:
if c.Bool("no-watch") || !msg {
continue // not ready to read config
}
// XXX: case compile_event: ...
// ...
case <-exitchan:
return
}
var config *gconfig.GraphConfig
if c.IsSet("file") {
config = gconfig.ParseConfigFromFile(file)
} else if c.IsSet("puppet") {
config = puppet.ParseConfigFromPuppet(c.String("puppet"), c.String("puppet-conf"))
}
if config == nil {
log.Printf("Config: Parse failure")
continue
}
if config.Hostname != "" && config.Hostname != hostname {
log.Printf("Config: Hostname changed, ignoring config!")
continue
}
config.Hostname = hostname // set it in case it was ""
// run graph vertex LOCK...
if !first { // TODO: we can flatten this check out I think
converger.Pause() // FIXME: add sync wait?
G.Pause() // sync
}
// build graph from yaml file on events (eg: from etcd)
// we need the vertices to be paused to work on them
if newFullgraph, err := config.NewGraphFromConfig(fullGraph, EmbdEtcd, noop); err == nil { // keep references to all original elements
fullGraph = newFullgraph
} else {
log.Printf("Config: Error making new graph from config: %v", err)
// unpause!
if !first {
G.Start(&wg, first) // sync
converger.Start() // after G.Start()
}
continue
}
G = fullGraph.Copy() // copy to active graph
// XXX: do etcd transaction out here...
G.AutoEdges() // add autoedges; modifies the graph
G.AutoGroup() // run autogroup; modifies the graph
// TODO: do we want to do a transitive reduction?
log.Printf("Graph: %v", G) // show graph
err := G.ExecGraphviz(c.String("graphviz-filter"), c.String("graphviz"))
if err != nil {
log.Printf("Graphviz: %v", err)
} else {
log.Printf("Graphviz: Successfully generated graph!")
}
G.AssociateData(converger)
// G.Start(...) needs to be synchronous or wait,
// because if half of the nodes are started and
// some are not ready yet and the EtcdWatch
// loops, we'll cause G.Pause(...) before we
// even got going, thus causing nil pointer errors
G.Start(&wg, first) // sync
converger.Start() // after G.Start()
first = false
}
}()
configWatcher := NewConfigWatcher()
events := configWatcher.Events()
if !c.Bool("no-watch") {
configWatcher.Add(c.StringSlice("remote")...) // add all the files...
} else {
events = nil // signal that no-watch is true
}
// initialize the add watcher, which calls the f callback on map changes
convergerCb := func(f func(map[string]bool) error) (func(), error) {
return etcd.EtcdAddHostnameConvergedWatcher(EmbdEtcd, f)
}
// build remotes struct for remote ssh
remotes := remote.NewRemotes(
EmbdEtcd.LocalhostClientURLs().StringSlice(),
[]string{etcd.DefaultClientURL},
noop,
c.StringSlice("remote"), // list of files
events, // watch for file changes
cConns,
c.Bool("allow-interactive"),
c.String("ssh-priv-id-rsa"),
!c.Bool("no-caching"),
depth,
prefix,
converger,
convergerCb,
program,
)
// TODO: is there any benefit to running the remotes above in the loop?
// wait for etcd to be running before we remote in, which we do above!
go remotes.Run()
if !c.IsSet("file") && !c.IsSet("puppet") {
converger.Start() // better start this for empty graphs
}
log.Println("Main: Running...")
waitForSignal(exit) // pass in exit channel to watch
log.Println("Destroy...")
configWatcher.Close() // stop sending file changes to remotes
remotes.Exit() // tell all the remote connections to shutdown; waits!
G.Exit() // tell all the children to exit
// tell inner main loop to exit
close(exitchan)
// cleanup etcd main loop last so it can process everything first
if err := EmbdEtcd.Destroy(); err != nil { // shutdown and cleanup etcd
log.Printf("Etcd exited poorly with: %v", err)
}
if global.DEBUG {
log.Printf("Graph: %v", G)
}
wg.Wait() // wait for primary go routines to exit
// TODO: wait for each vertex to exit...
log.Println("Goodbye!")
return nil
}
