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app.go
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app.go
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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"net/http"
"os"
"time"
"github.com/gocql/gocql"
"github.com/gorilla/mux"
)
// DefaultEndpoint ...
func DefaultEndpoint(w http.ResponseWriter, r *http.Request) {
fmt.Fprint(w, "Default")
}
func GetSessionEndpoint(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
ResponseNoData(w, GetSessionError)
log.Print("Body read failed")
log.Print(err)
return
}
request := Session{}
err = json.Unmarshal(body, &request)
if err != nil {
ResponseNoData(w, GetSessionError)
log.Print("Body Unmarshal failed")
log.Print(err)
return
}
SetHeaders(w)
resp := Response{}
// Connect to Cassandra cluster
sess, err := ConnectToCassandra("sessions")
if err != nil {
ResponseNoData(w, GetSessionError)
log.Print("Cassandra connection failed")
log.Print(err)
return
}
defer sess.Close()
// Connect to Redis server
cache, err := RedisConnect(1)
if err != nil {
ResponseNoData(w, GetSessionError)
log.Print("Redis connection failed")
log.Print(err)
return
}
// Check Redis server
val, err := cache.Get(request.UUID).Result()
if val != "" {
session := Session{}
_ = json.Unmarshal([]byte(val), &session)
resp.SessionID = session.SessionID
resp.Code = GetSessionSuccess
response, _ := json.Marshal(resp)
fmt.Fprint(w, string(response))
return
}
if err := sess.Query(`SELECT sessionid FROM sessions WHERE userid = ? AND origin = ? AND active=True ALLOW FILTERING`,
request.UUID, request.Origin).Consistency(gocql.One).Scan(&resp.SessionID); err != nil || resp.SessionID == "" {
ResponseNoData(w, GetSessionError)
log.Print("Cassandra query failed")
log.Print(err)
return
}
// Add to Redis server
storedData := Session{
UUID: request.UUID,
Origin: request.Origin,
SessionID: resp.SessionID,
}
storedDataBytes, err := json.Marshal(storedData)
err = cache.Set(resp.SessionID, storedDataBytes, 0).Err()
if err != nil {
log.Print("Redis caching failed")
log.Print(err)
}
resp.Code = GetSessionSuccess
response, _ := json.Marshal(resp)
fmt.Fprint(w, string(response))
}
func NewSessionEndpoint(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
request := Session{}
err = json.Unmarshal(body, &request)
SetHeaders(w)
// Connect to Cassandra cluster
sess, err := ConnectToCassandra("sessions")
if err != nil {
ResponseNoData(w, GetSessionError)
log.Print("Cassandra connection failed")
log.Print(err)
return
}
defer sess.Close()
// Connect to Redis server
cache, err := RedisConnect(1)
if err != nil {
ResponseNoData(w, GetSessionError)
log.Print("Redis connection failed")
log.Print(err)
return
}
// Generate ID and add to query
sessionid := RandomString(16)
if err := sess.Query(`INSERT INTO sessions (sessionid, active, ts, userid, origin) VALUES (?, true, ?, ?, ?)`,
sessionid, time.Now(), request.UUID, request.Origin).Exec(); err != nil {
ResponseNoData(w, PostSessionError)
log.Print("Query insert failed: ")
log.Print(err)
return
}
// Add data to Redis
storedData := Session{
UUID: request.UUID,
Origin: request.Origin,
SessionID: sessionid,
}
storedDataBytes, err := json.Marshal(storedData)
err = cache.Set(sessionid, storedDataBytes, 0).Err()
if err != nil {
log.Print("Redis caching failed")
log.Print(err)
}
resp := Response{}
resp.Code = PostSessionSuccess
resp.SessionID = sessionid
response, _ := json.Marshal(resp)
fmt.Fprint(w, string(response))
}
func DeleteSessionEndpoint(w http.ResponseWriter, r *http.Request) {
body, err := ioutil.ReadAll(r.Body)
if err != nil {
ResponseNoData(w, GetSessionError)
log.Print("Body read failed")
log.Print(err)
return
}
request := Session{}
err = json.Unmarshal(body, &request)
if err != nil {
ResponseNoData(w, GetSessionError)
log.Print("Body Unmarshal failed")
log.Print(err)
return
}
SetHeaders(w)
resp := Response{}
// Connect to Cassandra cluster
db, err := ConnectToCassandra("sessions")
defer db.Close()
// Connect to Redis server
cache, err := RedisConnect(1)
if err != nil {
ResponseNoData(w, GetSessionError)
log.Print(err)
return
}
// Remove session from redis
err = cache.Del(request.SessionID).Err()
// Remove session from Cassandra
if err := db.Query(`UPDATE sessions SET active=false WHERE userid = ? AND origin = ?`,
request.UUID, request.Origin).Exec(); err != nil {
ResponseNoData(w, DelSessionError)
log.Print("Query update failed: ")
log.Print(err)
return
}
resp.Code = DelSessionSuccess
response, _ := json.Marshal(resp)
fmt.Fprint(w, string(response))
}
func main() {
r := mux.NewRouter()
r.HandleFunc("/", DefaultEndpoint)
r.HandleFunc("/api/v1/private/sessions/check/", GetSessionEndpoint).Methods("POST")
r.HandleFunc("/api/v1/private/sessions/add/", NewSessionEndpoint).Methods("POST")
r.HandleFunc("/api/v1/private/sessions/del/", DeleteSessionEndpoint).Methods("POST")
if os.Getenv("PORT") == "" {
os.Setenv("PORT", "80")
}
if err := http.ListenAndServe(":"+os.Getenv("PORT"), r); err != nil {
log.Print("Server start failed")
log.Fatal(err)
}
}