/
appmon.go
190 lines (160 loc) · 4.57 KB
/
appmon.go
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package erlang
// TODO: https://github.com/erlang/otp/blob/master/lib/runtime_tools-1.13.1/src/appmon_info.erl
import (
"time"
"github.com/ergo-services/ergo/etf"
"github.com/ergo-services/ergo/gen"
"github.com/ergo-services/ergo/lib"
"github.com/ergo-services/ergo/node"
)
type appMon struct {
gen.Server
}
type appMonState struct {
jobs map[etf.Atom][]jobDetails
}
type jobDetails struct {
name etf.Atom
args etf.List
sendTo etf.Pid
}
// Init initializes process state using arbitrary arguments
func (am *appMon) Init(process *gen.ServerProcess, args ...etf.Term) error {
lib.Log("APP_MON: Init %#v", args)
from := args[0]
process.Link(from.(etf.Pid))
process.State = &appMonState{
jobs: make(map[etf.Atom][]jobDetails),
}
return nil
}
// HandleCast
func (am *appMon) HandleCast(process *gen.ServerProcess, message etf.Term) gen.ServerStatus {
var appState *appMonState = process.State.(*appMonState)
lib.Log("APP_MON: HandleCast: %#v", message)
node := process.Env(node.EnvKeyNode).(node.Node)
switch message {
case "sendStat":
for cmd, jobs := range appState.jobs {
switch cmd {
case "app_ctrl":
// From ! {delivery, self(), Cmd, Aux, Result}
apps := node.WhichApplications()
for i := range jobs {
appList := make(etf.List, len(apps))
for ai, a := range apps {
appList[ai] = etf.Tuple{a.PID, etf.Atom(a.Name),
etf.Tuple{etf.Atom(a.Name), a.Description, a.Version},
}
}
delivery := etf.Tuple{etf.Atom("delivery"), process.Self(), cmd, jobs[i].name, appList}
process.Send(jobs[i].sendTo, delivery)
}
case "app":
for i := range jobs {
appTree := am.makeAppTree(process, jobs[i].name)
if appTree == nil {
continue
}
delivery := etf.Tuple{etf.Atom("delivery"), process.Self(), cmd, jobs[i].name, appTree}
process.Send(jobs[i].sendTo, delivery)
}
}
}
process.CastAfter(process.Self(), "sendStat", 2*time.Second)
return gen.ServerStatusOK
default:
switch m := message.(type) {
case etf.Tuple:
if len(m) == 5 {
// etf.Tuple{etf.Pid{Node:"erl-demo@127.0.0.1", Id:0x7c, Serial:0x0, Creation:0x1}, "app_ctrl", "demo@127.0.0.1", "true", etf.List{}}
job := jobDetails{
name: m.Element(3).(etf.Atom),
args: m.Element(5).(etf.List),
sendTo: m.Element(1).(etf.Pid),
}
if m.Element(4) == etf.Atom("true") {
// add new job
if len(appState.jobs) == 0 {
process.Cast(process.Self(), "sendStat")
}
if jobList, ok := appState.jobs[m.Element(2).(etf.Atom)]; ok {
for i := range jobList {
if jobList[i].name == job.name {
return gen.ServerStatusOK
}
}
jobList = append(jobList, job)
appState.jobs[m.Element(2).(etf.Atom)] = jobList
} else {
appState.jobs[m.Element(2).(etf.Atom)] = []jobDetails{job}
}
} else {
// remove a job
if jobList, ok := appState.jobs[m.Element(2).(etf.Atom)]; ok {
for i := range jobList {
if jobList[i].name == job.name {
jobList[i] = jobList[0]
jobList = jobList[1:]
if len(jobList) > 0 {
appState.jobs[m.Element(2).(etf.Atom)] = jobList
} else {
delete(appState.jobs, m.Element(2).(etf.Atom))
}
break
}
}
}
if len(appState.jobs) == 0 {
return gen.ServerStatusStop
}
}
return gen.ServerStatusOK
}
}
}
return gen.ServerStatusStop
}
func (am *appMon) makeAppTree(process gen.Process, app etf.Atom) etf.Tuple {
node := process.Env(node.EnvKeyNode).(node.Node)
appInfo, err := node.ApplicationInfo(string(app))
if err != nil {
return nil
}
resolver := make(map[etf.Pid]interface{})
tree := makeTree(process, resolver, appInfo.PID)
children := etf.List{etf.Tuple{appInfo.PID, appInfo.PID.String()}}
for p, n := range resolver {
children = append(children, etf.Tuple{p, n})
}
appTree := etf.Tuple{
appInfo.PID.String(), // pid or registered name
children,
tree,
etf.List{}, // TODO: links
}
return appTree
}
func makeTree(process gen.Process, resolver map[etf.Pid]interface{}, pid etf.Pid) etf.List {
pidProcess := process.ProcessByPid(pid)
if pidProcess == nil {
return etf.List{}
}
if name := pidProcess.Name(); name != "" {
resolver[pid] = name
} else {
resolver[pid] = pid.String()
}
tree := etf.List{}
pchildren, err := pidProcess.Children()
if err != nil {
return tree
}
for _, cp := range pchildren {
children := makeTree(process, resolver, cp)
child := etf.Tuple{resolver[pid], resolver[cp]}
tree = append(tree, child)
tree = append(tree, children...)
}
return tree
}