// Init my own customer database e.g. to ensure indexes.
func initCustomerDB() {
Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameINIT, `Start init of customer database.`)
defer Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameINIT, `Done init of customer database.`)
// Get the database:
dbSession, db := CustomerDB.DB()
defer dbSession.Close()
// Any issues with the database?
if db == nil {
Log.LogFull(senderName, LM.CategoryAPP, LM.LevelERROR, LM.SeverityCritical, LM.ImpactCritical, LM.MessageNameDATABASE, `Was not able to get the customer database.`)
return
}
//
// Get all collections:
//
// The collection for the answers:
collAnswers := db.C(`Answers`)
//
// Ensure the indexes:
//
// Index for the text column:
collAnswers.EnsureIndexKey(`Answer`)
}
// Register all of my own configuration parameters.
func registerAllAppConfigurationParameters() {
Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameSTARTUP, `Register now all app configuration parameters.`)
defer Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameSTARTUP, `Register now all app configuration parameters done.`)
// Add the parameter MyMotto with the default value "Keep calm :)".
// You can change the value by using the admin's web interface on http://127.0.0.1:60000/
ConfigurationDB.CheckSingleConfigurationPresentsAndAddIfMissing(`MyMotto`, `Keep calm :)`)
}
// Register all HTTP handlers for my app.
func registerHandlers() {
Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameSTARTUP, `Register now all app handlers.`)
defer Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameSTARTUP, `Register now all app handlers done.`)
// Public Handlers: Public reachable
Handlers.AddPublicHandler(`/`, Website.HandlerHome)
Handlers.AddPublicHandler(`/version`, Website.HandlerVersion)
Handlers.AddPublicHandler(`/question`, Website.HandlerShowQuestion)
Handlers.AddPublicHandler(`/store`, Website.HandlerStore2Database)
Handlers.AddPublicHandler(`/answers`, Website.HandlerAnswers)
// Admin Handlers: Reachable only on the local device or by using e.g. SSH tunnels
Handlers.AddAdminHandler(`/version`, Website.HandlerVersion)
Handlers.AddAdminHandler(`/test`, Website.HandlerTEST)
}
// This HTTP handler provides a question by using a HTML template.
func HandlerShowQuestion(response http.ResponseWriter, request *http.Request) {
Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameREQUEST, `Someone has requested the question handler.`, request.RemoteAddr)
// Read the language of the client for I18N (see https://en.wikipedia.org/wiki/Internationalization_and_localization):
lang := Tools.GetRequestLanguage(request)[0]
// This is the data object for the HTML template:
templateData := WebQuestion{}
// I18N example: Uses the client the German language?
if strings.Contains(lang.Language, `de`) {
// Case: German
templateData.IntroText = `Meine heutige Frage ist`
templateData.Question = `Wie geht es dir?`
templateData.PlaceholderText = `Deine Antwort:`
} else {
// Case: Default=English
templateData.IntroText = `My today's question is`
templateData.Question = `How are you?`
templateData.PlaceholderText = `Your answer:`
}
// Let the client know, that we understand his language:
Tools.SendChosenLanguage(response, lang)
// Try to execute the template with the data.
// The result gets sended to the client i.e. browser:
Templates.ProcessHTML(`Question`, response, templateData)
}
// This HTTP handler stores the answers to the database.
func HandlerStore2Database(response http.ResponseWriter, request *http.Request) {
Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameREQUEST, `Someone has requested the store handler.`, request.RemoteAddr)
// Read the send answer from the client:
answer := request.FormValue(`answer`)
// Get the customer database:
dbSession, db := CustomerDB.DB()
// After we are done, close the connection:
defer dbSession.Close()
// Any issues?
if db == nil {
Log.LogFull(senderName, LM.CategoryAPP, LM.LevelERROR, LM.SeverityCritical, LM.ImpactCritical, LM.MessageNameDATABASE, `Was not able to get the customer database.`)
return
}
// The collection for the answers:
collAnswers := db.C(`Answers`)
// Create the data object:
answerDB := DBAnswers{}
answerDB.Answer = answer
// Insert the object in the database:
collAnswers.Insert(answerDB)
// Redirect the client to the answers page:
defer http.Redirect(response, request, "/answers", 302)
}
// This HTTP handler prints the current motto and logs the request.
func HandlerHome(response http.ResponseWriter, request *http.Request) {
// Log the request:
Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameREQUEST, `Someone has requested the home.`, request.RemoteAddr)
// Get the current configuration value for your own configuration parameter:
// (You can change the value by using the admin's web interface on http://127.0.0.1:60000/)
currentMotto := ConfigurationDB.Read(`MyMotto`)
// Write the website:
fmt.Fprintf(response, "Welcome to my website. The current motto i.e. slogan is: '%s'.\n", currentMotto)
}
// This HTTP handler provides all answers by using a HTML template.
func HandlerAnswers(response http.ResponseWriter, request *http.Request) {
Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameREQUEST, `Someone has requested the answers.`, request.RemoteAddr)
// Read the language of the client for I18N (see https://en.wikipedia.org/wiki/Internationalization_and_localization):
lang := Tools.GetRequestLanguage(request)[0]
// This is the data object for the HTML template:
templateData := WebAnswers{}
// Get the customer database:
dbSession, db := CustomerDB.DB()
// After we are done, close the connection:
defer dbSession.Close()
// Any issues?
if db == nil {
Log.LogFull(senderName, LM.CategoryAPP, LM.LevelERROR, LM.SeverityCritical, LM.ImpactCritical, LM.MessageNameDATABASE, `Was not able to get the customer database.`)
return
}
// The collection for the answers:
collAnswers := db.C(`Answers`)
// Select the necessary documents in the database.
// In this case, we want all documents!
//
// Syntax for database queries, see http://gopkg.in/mgo.v2
//
selection := bson.D{}
if errFind := collAnswers.Find(selection).All(&templateData.Answers); errFind != nil {
Log.LogFull(senderName, LM.CategorySYSTEM, LM.LevelERROR, LM.SeverityUnknown, LM.ImpactUnknown, LM.MessageNameDATABASE, `Was not able to read all answers out of the database.`, `Error while find.`, errFind.Error())
}
// I18N example: Uses the client the German language?
if strings.Contains(lang.Language, `de`) {
// Case: German
templateData.IntroText = `Hier siehst du alle Antworten.`
} else {
// Case: Default=English
templateData.IntroText = `Here you see all answers.`
}
// Let the client know, that we understand his language:
Tools.SendChosenLanguage(response, lang)
// Try to execute the template with the data.
// The result gets sended to the client i.e. browser:
Templates.ProcessHTML(`Answers`, response, templateData)
}
// This is the entry point of any Go application.
func main() {
Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameSTARTUP, `MyApp is starting.`)
// Init the system's handlers first:
System.InitHandlers()
// Init all my own app handlers:
registerHandlers()
// Register all my own configuration parameters to the configuration database:
registerAllAppConfigurationParameters()
// Init my customer database:
initCustomerDB()
// Start the server and wait until the end:
System.StartAndBlockForever()
}
// This HTTP handler prints the current versions and logs the request.
func HandlerVersion(response http.ResponseWriter, request *http.Request) {
Log.LogShort(senderName, LM.CategoryAPP, LM.LevelINFO, LM.MessageNameREQUEST, `Someone has requested the version.`, request.RemoteAddr)
fmt.Fprintf(response, "%s\n", version)
}