// Handler for main information to be read and written from
func handler(w http.ResponseWriter, r *http.Request) {
// Create a new appengine context for logging purposes
c := appengine.NewContext(r)
// set the appengine transport using the http request
backend.SetTransport(r)
// get the current user
user := getUser(w, r, c)
// update the new cache on submit
cookie, _ := r.Cookie("submitting")
if cookie != nil && cookie.Value == "true" {
err := updatingCache_User(r, c, user)
if err != nil {
c.Errorf(err.Error())
}
http.SetCookie(w, &http.Cookie{Name: "submitting", Value: ""})
}
// Send to tag subpage
if r.URL.Path == "/tag" && r.FormValue("tagSearch") != "" {
tagHandler(w, r, c, user)
return
}
// Send to user subpage
if r.URL.Path == "/user" {
userHandler(w, r, c, user)
return
}
//Send to viewTags page
if r.URL.Path == "/viewTags" {
viewTagsHandler(w, r, c, user)
return
}
//Send to viewUsers page
if r.URL.Path == "/viewUsers" {
viewUsersHandler(w, r, c, user)
return
}
if r.URL.Path == "/userPage" {
userPageHandler(w, r, c, user)
return
}
if r.URL.Path == "/search" {
searchHandler(w, r, c, user)
return
}
page := template.Must(template.ParseFiles("public/template.html"))
pageQuery := []string{
"",
"",
}
// WriteResponse creates a new response with the various caches
if err := page.Execute(w, writeResponse(user, data, c, pageQuery)); err != nil {
c.Criticalf("%v", err.Error())
}
}
// Handler for main information to be read and written from.
// Does following functions in order:
// Refreshes sql db for changes to questions in SE API.
// Updates local cache if there's been changes to the db.
// Gets the current user to send in response.
// If a form has been submitted, the local cache and db gets updated with new values
// Finds the current subpage and redirects to the relevant handler
func handler(w http.ResponseWriter, r *http.Request) {
// Set context for logging
ctx := appengine.NewContext(r)
if checkForDBConnection() == false {
connectToDB(ctx)
}
backend.SetTransport(ctx)
if strings.HasPrefix(r.URL.Path, "/pullNewQn") {
newQnHandler(w, r, ctx)
return
}
// Pull any new questions added to StackOverflow
lastPull = updateDB(db, ctx, lastPull)
// Get the current user
user := getUser(w, r, ctx)
// Collect page number
pageNum, _ := strconv.Atoi(r.FormValue("page"))
if pageNum == 0 {
pageNum = 1
}
// Update the new cache on submit if submitting cookie is set
cookie, _ := r.Cookie("submitting")
if cookie != nil && cookie.Value == "true" {
// Update the cache based on the form values sent in the request
updateTime, err := updatingCache_User(ctx, r, user)
if err != nil {
log.Errorf(ctx, "Error updating cache: %v", err.Error())
} else {
mostRecentUpdate = updateTime
}
// Removing the cookie
http.SetCookie(w, &http.Cookie{Name: "submitting", Value: ""})
}
// Send to valid subpages
// else errorHandler
if strings.HasPrefix(r.URL.Path, "/?") || strings.HasPrefix(r.URL.Path, "/home") || r.URL.Path == "/" {
// Get data to send to page
data, updateTime, err := readFromDb(ctx, "")
if err != nil {
log.Errorf(ctx, "Error reading from db: %v", err.Error())
} else {
mostRecentUpdate = updateTime
}
// Parse the html template to serve to the page
page := template.Must(template.ParseFiles("public/template.html"))
pageQuery := []string{
"",
"",
}
// WriteResponse creates a new response with the various caches
if err := page.Execute(w, writeResponse(user, data, pageNum, pageQuery)); err != nil {
log.Errorf(ctx, "%v", err.Error())
}
} else if strings.HasPrefix(r.URL.Path, "/tag") && r.FormValue("tagSearch") != "" {
tagHandler(w, r, ctx, pageNum, user)
} else if strings.HasPrefix(r.URL.Path, "/user") {
userHandler(w, r, ctx, pageNum, user)
} else if strings.HasPrefix(r.URL.Path, "/viewTags") {
viewTagsHandler(w, r, ctx, pageNum, user)
} else if strings.HasPrefix(r.URL.Path, "/viewUsers") {
viewUsersHandler(w, r, ctx, pageNum, user)
} else if strings.HasPrefix(r.URL.Path, "/search") {
searchHandler(w, r, ctx, pageNum, user)
} else if strings.HasPrefix(r.URL.Path, "/addQuestion") {
addQuestionHandler(w, r, ctx, pageNum, user)
} else if strings.HasPrefix(r.URL.Path, "/addNewQuestion") {
addNewQuestionToDatabaseHandler(w, r, ctx)
} else {
errorHandler(w, r, ctx, http.StatusNotFound, "")
}
}