Adding timer resource and usage examples

config.go

@@ -46,11 +46,12 @@ type edgeConfig struct {
 type GraphConfig struct {
 	Graph     string `yaml:"graph"`
 	Resources struct {
-		Noop []*NoopRes `yaml:"noop"`
-		Pkg  []*PkgRes  `yaml:"pkg"`
-		File []*FileRes `yaml:"file"`
-		Svc  []*SvcRes  `yaml:"svc"`
-		Exec []*ExecRes `yaml:"exec"`
+		Noop  []*NoopRes  `yaml:"noop"`
+		Pkg   []*PkgRes   `yaml:"pkg"`
+		File  []*FileRes  `yaml:"file"`
+		Svc   []*SvcRes   `yaml:"svc"`
+		Exec  []*ExecRes  `yaml:"exec"`
+		Timer []*TimerRes `yaml:"timer"`
 	} `yaml:"resources"`
 	Collector []collectorResConfig `yaml:"collect"`
 	Edges     []edgeConfig         `yaml:"edges"`

examples/timer1.yaml

@@ -0,0 +1,25 @@
+---
+graph: mygraph
+comment: timer example
+resources:
+  timer:
+  - name: timer1
+    interval: 30
+  exec:
+  - name: exec1
+    cmd: echo hello world
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+edges:
+- name: e1
+  from:
+    kind: timer
+    name: timer1
+  to:
+    kind: exec
+    name: exec1

examples/timer2.yaml

@@ -0,0 +1,43 @@
+---
+graph: mygraph
+comment: example of multiple timers
+resources:
+  timer:
+  - name: timer1
+    interval: 30
+  - name: timer2
+    interval: 60
+  exec:
+  - name: exec1
+    cmd: echo hello world 30
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+  - name: exec2
+    cmd: echo hello world 60
+    timeout: 0
+    watchcmd: ''
+    watchshell: ''
+    ifcmd: ''
+    ifshell: ''
+    pollint: 0
+    state: present
+edges:
+- name: e1
+  from:
+    kind: timer
+    name: timer1
+  to:
+    kind: exec
+    name: exec1
+- name: e2
+  from:
+    kind: timer
+    name: timer2
+  to:
+    kind: exec
+    name: exec2

timer.go

@@ -0,0 +1,148 @@
+// Mgmt
+// Copyright (C) 2013-2016+ James Shubin and the project contributors
+// Written by James Shubin <james@shubin.ca> and the project contributors
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Affero General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program 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 Affero General Public License for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+package main
+
+import (
+	"encoding/gob"
+	"log"
+	"time"
+)
+
+func init() {
+	gob.Register(&TimerRes{})
+}
+
+// TimerRes is a timer resource
+type TimerRes struct {
+	BaseRes  `yaml:",inline"`
+	Interval int `yaml:"interval"` // Interval : Interval between runs
+}
+
+type TimerUUID struct {
+	BaseUUID
+	name string
+}
+
+// NewTimerRes creates a new TimerRes
+func NewTimerRes(name string, interval int) *TimerRes {
+	obj := &TimerRes{
+		BaseRes: BaseRes{
+			Name: name,
+		},
+		Interval: interval,
+	}
+	obj.Init()
+	return obj
+}
+
+func (obj *TimerRes) Init() {
+	obj.BaseRes.kind = "Timer"
+	obj.BaseRes.Init() // call base init, b/c we're overrriding
+}
+
+// Validate the params that are passed to TimerRes
+// Currently we are getting only an interval in seconds
+// which gets validated by go compiler
+func (obj *TimerRes) Validate() bool {
+	return true
+}
+
+func (obj *TimerRes) Watch(processChan chan Event) {
+	if obj.IsWatching() {
+		return
+	}
+
+	// Create a time.Ticker for the given interval
+	ticker := time.NewTicker(time.Duration(obj.Interval) * time.Second)
+	defer ticker.Stop()
+
+	obj.SetWatching(true)
+	defer obj.SetWatching(false)
+	cuuid := obj.converger.Register()
+	defer cuuid.Unregister()
+
+	var send = false
+
+	for {
+		obj.SetState(resStateWatching)
+		select {
+		case <-ticker.C: // received the timer event
+			send = true
+			log.Printf("%v[%v]: received tick", obj.Kind(), obj.GetName())
+		case event := <-obj.events:
+			cuuid.SetConverged(false)
+			if exit, _ := obj.ReadEvent(&event); exit {
+				return
+			}
+		case _ = <-cuuid.ConvergedTimer():
+			cuuid.SetConverged(true)
+			continue
+		}
+		if send {
+			send = false
+			obj.isStateOK = false
+			resp := NewResp()
+			processChan <- Event{eventNil, resp, "timer ticked", true}
+			resp.ACKWait()
+		}
+	}
+}
+
+func (obj *TimerRes) GetUUIDs() []ResUUID {
+	x := &TimerUUID{
+		BaseUUID: BaseUUID{
+			name: obj.GetName(),
+			kind: obj.Kind(),
+		},
+		name: obj.Name,
+	}
+	return []ResUUID{x}
+}
+
+func (obj *TimerRes) AutoEdges() AutoEdge {
+	return nil
+}
+
+func (obj *TimerRes) Compare(res Res) bool {
+	switch res.(type) {
+	case *TimerRes:
+		res := res.(*TimerRes)
+		if !obj.BaseRes.Compare(res) {
+			return false
+		}
+		if obj.Name != res.Name {
+			return false
+		}
+		if obj.Interval != res.Interval {
+			return false
+		}
+	default:
+		return false
+	}
+	return true
+}
+
+// CheckApply method for Timer resource. Does nothing, returns happy!
+func (obj *TimerRes) CheckApply(apply bool) (bool, error) {
+	log.Printf("%v[%v]: CheckApply(%t)", obj.Kind(), obj.GetName(), apply)
+	return true, nil // state is always okay
+}
+
+func (obj *TimerRes) CollectPatten(pattern string) {
+	return
+}