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libmgmt-subgraph1.go
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libmgmt-subgraph1.go
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// libmgmt example of graph resource
package main
import (
"fmt"
"log"
"os"
"os/signal"
"sync"
"syscall"
"time"
"github.com/purpleidea/mgmt/gapi"
mgmt "github.com/purpleidea/mgmt/lib"
"github.com/purpleidea/mgmt/pgraph"
"github.com/purpleidea/mgmt/resources"
"github.com/urfave/cli"
)
// XXX: this has not been updated to latest GAPI/Deploy API. Patches welcome!
const (
// Name is the name of this frontend.
Name = "libmgmt"
)
// MyGAPI implements the main GAPI interface.
type MyGAPI struct {
Name string // graph name
Interval uint // refresh interval, 0 to never refresh
data gapi.Data
initialized bool
closeChan chan struct{}
wg sync.WaitGroup // sync group for tunnel go routines
}
// NewMyGAPI creates a new MyGAPI struct and calls Init().
func NewMyGAPI(data gapi.Data, name string, interval uint) (*MyGAPI, error) {
obj := &MyGAPI{
Name: name,
Interval: interval,
}
return obj, obj.Init(data)
}
// Cli takes a cli.Context, and returns our GAPI if activated. All arguments
// should take the prefix of the registered name. On activation, if there are
// any validation problems, you should return an error. If this was not
// activated, then you should return a nil GAPI and a nil error.
func (obj *MyGAPI) Cli(c *cli.Context, fs resources.Fs) (*gapi.Deploy, error) {
if s := c.String(obj.Name); c.IsSet(obj.Name) {
if s != "" {
return nil, fmt.Errorf("input is not empty")
}
return &gapi.Deploy{
Name: obj.Name,
Noop: c.GlobalBool("noop"),
Sema: c.GlobalInt("sema"),
GAPI: &MyGAPI{
// TODO: add properties here...
},
}, nil
}
return nil, nil // we weren't activated!
}
// CliFlags returns a list of flags used by this deploy subcommand.
func (obj *MyGAPI) CliFlags() []cli.Flag {
return []cli.Flag{
cli.StringFlag{
Name: obj.Name,
Value: "",
Usage: "run",
},
}
}
// Init initializes the MyGAPI struct.
func (obj *MyGAPI) Init(data gapi.Data) error {
if obj.initialized {
return fmt.Errorf("already initialized")
}
if obj.Name == "" {
return fmt.Errorf("the graph name must be specified")
}
obj.data = data // store for later
obj.closeChan = make(chan struct{})
obj.initialized = true
return nil
}
// Graph returns a current Graph.
func (obj *MyGAPI) Graph() (*pgraph.Graph, error) {
if !obj.initialized {
return nil, fmt.Errorf("%s: MyGAPI is not initialized", Name)
}
g, err := pgraph.NewGraph(obj.Name)
if err != nil {
return nil, err
}
metaparams := resources.DefaultMetaParams
content := "I created a subgraph!\n"
f0 := &resources.FileRes{
BaseRes: resources.BaseRes{
Name: "README",
Kind: "file",
MetaParams: metaparams,
},
Path: "/tmp/mgmt/README",
Content: &content,
State: "present",
}
g.AddVertex(f0)
// create a subgraph to add *into* a graph resource
subGraph, err := pgraph.NewGraph(fmt.Sprintf("%s->subgraph", obj.Name))
if err != nil {
return nil, err
}
// add elements into the sub graph
f1 := &resources.FileRes{
BaseRes: resources.BaseRes{
Name: "file1",
Kind: "file",
MetaParams: metaparams,
},
Path: "/tmp/mgmt/sub1",
State: "present",
}
subGraph.AddVertex(f1)
n1 := &resources.NoopRes{
BaseRes: resources.BaseRes{
Name: "noop1",
Kind: "noop",
MetaParams: metaparams,
},
}
subGraph.AddVertex(n1)
e0 := &resources.Edge{Name: "e0"}
e0.Notify = true // send a notification from v0 to v1
subGraph.AddEdge(f1, n1, e0)
// create the actual resource to hold the sub graph
subGraphRes0 := &resources.GraphRes{ // TODO: should we name this SubGraphRes ?
BaseRes: resources.BaseRes{
Name: "subgraph1",
Kind: "graph",
MetaParams: metaparams,
},
Graph: subGraph,
}
g.AddVertex(subGraphRes0) // add it to the main graph
//g, err := config.NewGraphFromConfig(obj.data.Hostname, obj.data.World, obj.data.Noop)
return g, nil
}
// Next returns nil errors every time there could be a new graph.
func (obj *MyGAPI) Next() chan gapi.Next {
ch := make(chan gapi.Next)
obj.wg.Add(1)
go func() {
defer obj.wg.Done()
defer close(ch) // this will run before the obj.wg.Done()
if !obj.initialized {
next := gapi.Next{
Err: fmt.Errorf("%s: MyGAPI is not initialized", Name),
Exit: true, // exit, b/c programming error?
}
ch <- next
return
}
startChan := make(chan struct{}) // start signal
close(startChan) // kick it off!
ticker := make(<-chan time.Time)
if obj.data.NoStreamWatch || obj.Interval <= 0 {
ticker = nil
} else {
// arbitrarily change graph every interval seconds
t := time.NewTicker(time.Duration(obj.Interval) * time.Second)
defer t.Stop()
ticker = t.C
}
for {
select {
case <-startChan: // kick the loop once at start
startChan = nil // disable
// pass
case <-ticker:
// pass
case <-obj.closeChan:
return
}
log.Printf("%s: Generating new graph...", Name)
select {
case ch <- gapi.Next{}: // trigger a run
case <-obj.closeChan:
return
}
}
}()
return ch
}
// Close shuts down the MyGAPI.
func (obj *MyGAPI) Close() error {
if !obj.initialized {
return fmt.Errorf("%s: MyGAPI is not initialized", Name)
}
close(obj.closeChan)
obj.wg.Wait()
obj.initialized = false // closed = true
return nil
}
// Run runs an embedded mgmt server.
func Run() error {
obj := &mgmt.Main{}
obj.Program = "libmgmt" // TODO: set on compilation
obj.Version = "0.0.1" // TODO: set on compilation
obj.TmpPrefix = true // disable for easy debugging
//prefix := "/tmp/testprefix/"
//obj.Prefix = &p // enable for easy debugging
obj.IdealClusterSize = -1
obj.ConvergedTimeout = -1
obj.Noop = false // FIXME: careful!
//obj.GAPI = &MyGAPI{ // graph API
// Name: "libmgmt", // TODO: set on compilation
// Interval: 60 * 10, // arbitrarily change graph every 15 seconds
//}
if err := obj.Init(); err != nil {
return err
}
// install the exit signal handler
exit := make(chan struct{})
defer close(exit)
go func() {
signals := make(chan os.Signal, 1)
signal.Notify(signals, os.Interrupt) // catch ^C
//signal.Notify(signals, os.Kill) // catch signals
signal.Notify(signals, syscall.SIGTERM)
select {
case sig := <-signals: // any signal will do
if sig == os.Interrupt {
log.Println("Interrupted by ^C")
obj.Exit(nil)
return
}
log.Println("Interrupted by signal")
obj.Exit(fmt.Errorf("killed by %v", sig))
return
case <-exit:
return
}
}()
return obj.Run()
}
func main() {
log.Printf("Hello!")
if err := Run(); err != nil {
fmt.Println(err)
os.Exit(1)
return
}
log.Printf("Goodbye!")
}