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package main
import (
"context"
"encoding/json"
"net/http"
"time"
"github.com/rs/zerolog/log"
)
func (alertHandler Handler) HandleAlertPost(writer http.ResponseWriter, request *http.Request) {
var bodyJSON addAlertJSONType
writer.Header().Add("Content-Type", "application/json")
err := json.NewDecoder(request.Body).Decode(&bodyJSON)
if err != nil {
log.Printf(err.Error())
err := json.NewEncoder(writer).Encode(map[string]interface{}{
"isSuccessful": false,
"error": "not all parameters are valid.",
})
if err != nil {
log.Error().Err(err)
http.Error(writer, "internal server error", http.StatusInternalServerError)
}
}
if bodyJSON.Name == "" || bodyJSON.Expr == "" {
err := json.NewEncoder(writer).Encode(map[string]interface{}{
"isSuccessful": false,
"error": "not all parameters are valid.",
})
if err != nil {
log.Error().Err(errFailedUnmarshall)
http.Error(writer, "internal server error", http.StatusInternalServerError)
}
return
}
ctx, cancel := context.WithTimeout(request.Context(), redisContextTimeout*time.Second)
defer cancel()
key := "alert:" + bodyJSON.Name
alertHandler.rdb.Set(ctx, bodyJSON.Name, bodyJSON.Expr, 0)
alertHandler.rdb.SAdd(ctx, "alertkeys", key)
err = json.NewEncoder(writer).Encode(map[string]interface{}{
"isSuccessful": true,
"error": "",
})
if err != nil {
log.Error().Err(err)
http.Error(writer, "internal server error", http.StatusInternalServerError)
}
}
func (alertHandler Handler) HandleAlertDelete(writer http.ResponseWriter, request *http.Request) {
var identifier string
writer.Header().Add("Content-Type", "application/json")
params := request.URL.Query()
for key, value := range params {
switch key {
case "key":
identifier = value[0]
default:
log.Error().Err(errUnknownParam)
}
}
if identifier == "" {
err := json.NewEncoder(writer).Encode(map[string]interface{}{
"isSuccessful": false,
"error": "Id parameter is not valid.",
})
if err != nil {
log.Error().Err(err)
http.Error(writer, "internal server error", http.StatusInternalServerError)
}
return
}
ctx, cancel := context.WithTimeout(request.Context(), redisContextTimeout*time.Second)
defer cancel()
alertHandler.rdb.Del(ctx, identifier)
setKey := "alert:" + identifier
alertHandler.rdb.SRem(ctx, "alertkeys", setKey)
log.Printf(setKey)
err := json.NewEncoder(writer).Encode(struct {
IsSuccessful bool `json:"isSuccessful"`
Err string `json:"err"`
}{IsSuccessful: true, Err: ""})
if err != nil {
log.Error().Err(err)
http.Error(writer, "internal server error", http.StatusInternalServerError)
}
}
func (alertHandler Handler) HandleAlertGet(writer http.ResponseWriter, request *http.Request) {
var identifier string
writer.Header().Add("Content-Type", "application/json")
params := request.URL.Query()
for key, value := range params {
switch key {
case "key":
identifier = value[0]
default:
log.Error().Err(errUnknownParam)
}
}
if identifier == "" {
err := json.NewEncoder(writer).Encode(map[string]interface{}{
"isSuccessful": false,
"error": "Id parameter is not valid.",
})
if err != nil {
log.Error().Err(err)
http.Error(writer, "internal server error", http.StatusInternalServerError)
}
return
}
ctx, cancel := context.WithTimeout(request.Context(), redisContextTimeout*time.Second)
defer cancel()
redisResult := alertHandler.rdb.Get(ctx, identifier)
redisResultString, err := redisResult.Result()
if err != nil {
log.Err(err)
}
var ErrorString string
if err == nil {
ErrorString = ""
} else {
ErrorString = err.Error()
}
writer.Header().Add("Content-Type", "application/json")
err = json.NewEncoder(writer).Encode(struct {
IsSuccessful bool `json:"isSuccessful"`
Error string `json:"error"`
Key string `json:"key"`
Expr string `json:"expr"`
}{IsSuccessful: true, Error: ErrorString, Key: identifier, Expr: redisResultString})
if err != nil {
log.Error().Err(err)
http.Error(writer, "internal server error", http.StatusInternalServerError)
}
}
func alertHandler(writer http.ResponseWriter, request *http.Request) {
addSecureHeaders(&writer)
handler := Handler{rdb: rdb}
switch request.Method {
case http.MethodPost:
handler.HandleAlertPost(writer, request)
case http.MethodPut:
http.Error(writer, "Method is not supported.", http.StatusNotFound)
case http.MethodPatch:
http.Error(writer, "Method is not supported.", http.StatusNotFound)
case http.MethodDelete:
handler.HandleAlertDelete(writer, request)
case http.MethodGet:
handler.HandleAlertGet(writer, request)
default:
http.Error(writer, "Method is not supported.", http.StatusNotFound)
}
}
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