monit.gno

 1// Package monit links a monitoring system with the chain in both directions.
 2//
 3// The agent will periodically call Incr() and verify that the value is always
 4// higher than the previously known one. The contract will store the last update
 5// time and use it to detect whether or not the monitoring agent is functioning
 6// correctly.
 7package monit
 8
 9import (
10	"std"
11	"time"
12
13	"gno.land/p/demo/ownable"
14	"gno.land/p/demo/ufmt"
15	"gno.land/p/demo/watchdog"
16)
17
18var (
19	counter          int
20	lastUpdate       time.Time
21	lastCaller       std.Address
22	watchdogDuration = 5 * time.Minute
23	wd               = watchdog.Watchdog{Duration: watchdogDuration}
24	Ownable          = ownable.NewWithOrigin()
25)
26
27// Incr increments the counter and informs the watchdog that we're alive.
28// This function can be called by anyone.
29func Incr(cur realm) int {
30	counter++
31	lastUpdate = time.Now()
32	lastCaller = std.PreviousRealm().Address()
33	wd.Alive()
34	return counter
35}
36
37// Reset resets the realm state.
38// This function can only be called by the admin.
39func Reset(cur realm) {
40	Ownable.AssertOwnedByPrevious()
41	counter = 0
42	lastCaller = std.PreviousRealm().Address()
43	lastUpdate = time.Now()
44	wd = watchdog.Watchdog{Duration: watchdogDuration}
45}
46
47func Render(_ string) string {
48	status := wd.Status()
49	return ufmt.Sprintf(
50		"counter=%d\nlast update=%s\nlast caller=%s\nstatus=%s",
51		counter, lastUpdate, lastCaller, status,
52	)
53}