// ping does the actual pinging of the site and calls the notifications
func ping(s database.Site, db *sql.DB, requestURL URLRequester,
sendEmail notifier.EmailSender, sendSms notifier.SmsSender, wg *sync.WaitGroup, stop chan struct{}) {
defer wg.Done()
// Initialize the previous state of site to the database value. On site creation will initialize to true.
siteWasUp := s.IsSiteUp
var statusChange bool
var partialDetails string
var partialSubject string
for {
// initialize statusChange to false and only notify on change of siteWasUp status
statusChange = false
// Check for a quit signal to stop the pinging
select {
case <-stop:
log.Println("Stopping ", s.Name)
return
case <-time.After(time.Duration(s.PingIntervalSeconds) * time.Second):
// Do nothing
}
if !s.IsActive {
log.Println(s.Name, "Paused")
continue
}
bodyContent, statusCode, responseTime, err := requestURL(s.URL, s.TimeoutSeconds)
log.Println(s.Name, "Pinged")
// Setup ping information for recording.
p := database.Ping{SiteID: s.SiteID, TimeRequest: time.Now()}
if err != nil {
// Check if the error is due to the Internet not being Accessible
if _, ok := err.(InternetAccessError); ok {
log.Println(s.Name, "Unable to determine site status -", err)
continue
}
log.Println(s.Name, "Error", err)
if siteWasUp {
statusChange = true
partialSubject = "Site is Down"
partialDetails = "Site is down, Error is " + err.Error()
}
siteWasUp = false
} else if statusCode < 200 || statusCode > 299 { // Check if the status code is in the 2xx range.
log.Println(s.Name, "Error - HTTP Status Code is", statusCode)
if siteWasUp {
statusChange = true
partialSubject = "Site is Down"
partialDetails = "Site is down, HTTP Status Code is " + strconv.Itoa(statusCode) + "."
}
siteWasUp = false
} else {
siteUp := true
// if the site settings require check the content.
if siteUp && s.ContentExpected != "" && !strings.Contains(bodyContent, s.ContentExpected) {
siteUp = false
log.Println(s.Name, "Error - required body content missing: ", s.ContentExpected)
if siteWasUp {
statusChange = true
partialSubject = "Site is Down"
partialDetails = "Site is Down, required body content missing: " + s.ContentExpected + "."
}
}
if siteUp && s.ContentUnexpected != "" && strings.Contains(bodyContent, s.ContentUnexpected) {
siteUp = false
log.Println(s.Name, "Error - body content content has excluded content: ", s.ContentUnexpected)
if siteWasUp {
statusChange = true
partialSubject = "Site is Down"
partialDetails = "Site is Down, body content content has excluded content: " + s.ContentUnexpected + "."
}
}
if siteUp && !siteWasUp {
statusChange = true
partialSubject = "Site is Up"
partialDetails = fmt.Sprintf("Site is now up, response time was %v.", responseTime)
siteWasUp = true
}
siteWasUp = siteUp
}
// Save the ping details
p.Duration = int(responseTime.Nanoseconds() / 1e6)
p.HTTPStatusCode = statusCode
p.SiteDown = !siteWasUp
// Save ping to db.
err = p.CreatePing(db)
if err != nil {
log.Println("Error saving to ping to db:", err)
}
// Do the notifications if applicable
if statusChange {
// Update the site Status
err = s.UpdateSiteStatus(db, siteWasUp)
if err != nil {
log.Println("Error updating site status:", err)
}
// Do the notifications if applicable
subject := s.Name + ": " + partialSubject
details := s.Name + " at " + s.URL + ": " + partialDetails
log.Println("Will notify status change for", s.Name+":", details)
n := notifier.NewNotifier(s, details, subject, sendEmail, sendSms)
n.Notify()
}
}
}
// TestCreatePings tests creating the ping records for a given site.
func TestCreatePings(t *testing.T) {
var err error
db, err := database.InitializeTestDB("")
defer db.Close()
if err != nil {
t.Fatal("Failed to create database:", err)
}
// First create a site to associate with the pings.
s := database.Site{Name: "Test", IsActive: true, URL: "http://www.google.com", PingIntervalSeconds: 60, TimeoutSeconds: 30}
err = s.CreateSite(db)
if err != nil {
t.Fatal("Failed to create new site:", err)
}
// Create a ping result
p1 := database.Ping{SiteID: s.SiteID, TimeRequest: time.Date(2015, time.November, 10, 23, 22, 22, 00, time.UTC),
Duration: 280, HTTPStatusCode: 200, SiteDown: false}
err = p1.CreatePing(db)
if err != nil {
t.Fatal("Failed to create new ping:", err)
}
// Create a second ping result
p2 := database.Ping{SiteID: s.SiteID, TimeRequest: time.Date(2015, time.November, 10, 23, 22, 20, 00, time.UTC),
Duration: 290, HTTPStatusCode: 200, SiteDown: true}
err = p2.CreatePing(db)
if err != nil {
t.Fatal("Failed to create new ping:", err)
}
//Get the saved Ping
var saved database.Site
err = saved.GetSitePings(db, s.SiteID, time.Date(2015, time.November, 10, 23, 00, 00, 00, time.UTC),
time.Date(2015, time.November, 10, 23, 59, 00, 00, time.UTC))
if err != nil {
t.Fatal("Failed to retrieve saved pings:", err)
}
// Verify the first ping was Loaded with proper attibutes and sorted last.
if !reflect.DeepEqual(p1, saved.Pings[1]) {
t.Error("First saved ping not equal to input:\n", saved.Pings[1], p1)
}
// Verify the second ping was Loaded with proper attributes and sorted first.
if !reflect.DeepEqual(p2, saved.Pings[0]) {
t.Error("Second saved ping not equal to input:\n", saved.Pings[0], p2)
}
// Verify that the site reflects the last ping time.
err = saved.GetSite(db, s.SiteID)
if err != nil {
t.Fatal("Failed to retrieve site:", err)
}
if saved.LastPing != p2.TimeRequest {
t.Error("Last Ping on site does not match input:\n", saved.LastPing, p1.TimeRequest)
}
//Get the first ping for the site.
firstping, err := s.GetFirstPing(db)
if err != nil {
t.Fatal("Failed to retrieve first ping for the site:", err)
}
if firstping != p2.TimeRequest {
t.Error("First Ping on site does not match input:\n", firstping, p2.TimeRequest)
}
// Create a third ping with conflicting times should error.
p3 := database.Ping{SiteID: s.SiteID, TimeRequest: time.Date(2015, time.November, 10, 23, 22, 20, 00, time.UTC),
Duration: 300, HTTPStatusCode: 200, SiteDown: false}
err = p3.CreatePing(db)
if err == nil {
t.Fatal("Conflicting pings should throw error.")
}
}
