From 7862392c460184db9e29c0ab1c11880f3b8e78cb Mon Sep 17 00:00:00 2001 From: whysman Date: Thu, 2 Jan 2025 21:38:05 -0500 Subject: [PATCH] Refactored app for SSE --- config.yaml | 6 +- go.mod | 6 +- go.sum | 223 ++++++++++++++++++++++++++++++++++++++- main.go | 294 ++++++++++++++++++---------------------------------- 4 files changed, 328 insertions(+), 201 deletions(-) diff --git a/config.yaml b/config.yaml index 7517127..c439b93 100644 --- a/config.yaml +++ b/config.yaml @@ -1,3 +1,7 @@ redis: host: localhost - port: 6379 \ No newline at end of file + port: 6379 +kafka: + host: localhost + port: 9092 + topic: comm \ No newline at end of file diff --git a/go.mod b/go.mod index cdac06b..8fb7fa5 100644 --- a/go.mod +++ b/go.mod @@ -3,13 +3,17 @@ module pogdark-server go 1.22 require ( + github.com/confluentinc/confluent-kafka-go v1.9.2 github.com/go-redis/redis/v8 v8.11.5 github.com/gorilla/mux v1.8.1 - github.com/gorilla/websocket v1.5.3 + github.com/stretchr/testify v1.10.0 gopkg.in/yaml.v2 v2.4.0 ) require ( github.com/cespare/xxhash/v2 v2.1.2 // indirect + github.com/davecgh/go-spew v1.1.1 // indirect github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect + github.com/pmezard/go-difflib v1.0.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect ) diff --git a/go.sum b/go.sum index 3270a05..1cbc5c2 100644 --- a/go.sum +++ b/go.sum @@ -1,30 +1,247 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/actgardner/gogen-avro/v10 v10.1.0/go.mod h1:o+ybmVjEa27AAr35FRqU98DJu1fXES56uXniYFv4yDA= +github.com/actgardner/gogen-avro/v10 v10.2.1/go.mod h1:QUhjeHPchheYmMDni/Nx7VB0RsT/ee8YIgGY/xpEQgQ= +github.com/actgardner/gogen-avro/v9 v9.1.0/go.mod h1:nyTj6wPqDJoxM3qdnjcLv+EnMDSDFqE0qDpva2QRmKc= +github.com/antihax/optional v1.0.0/go.mod h1:uupD/76wgC+ih3iEmQUL+0Ugr19nfwCT1kdvxnR2qWY= +github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU= +github.com/cespare/xxhash/v2 v2.1.1/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= github.com/cespare/xxhash/v2 v2.1.2 h1:YRXhKfTDauu4ajMg1TPgFO5jnlC2HCbmLXMcTG5cbYE= github.com/cespare/xxhash/v2 v2.1.2/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs= +github.com/chzyer/logex v1.1.10/go.mod h1:+Ywpsq7O8HXn0nuIou7OrIPyXbp3wmkHB+jjWRnGsAI= +github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e/go.mod h1:nSuG5e5PlCu98SY8svDHJxuZscDgtXS6KTTbou5AhLI= +github.com/chzyer/test v0.0.0-20180213035817-a1ea475d72b1/go.mod h1:Q3SI9o4m/ZMnBNeIyt5eFwwo7qiLfzFZmjNmxjkiQlU= +github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw= +github.com/cncf/udpa/go v0.0.0-20191209042840-269d4d468f6f/go.mod h1:M8M6+tZqaGXZJjfX53e64911xZQV5JYwmTeXPW+k8Sc= +github.com/cncf/udpa/go 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h1:x2Otw96yda5+8+6ZeWwHIJTFkEHWP/qP8pJOzqEtWPM= +gopkg.in/mgo.v2 v2.0.0-20190816093944-a6b53ec6cb22/go.mod h1:yeKp02qBN3iKW1OzL3MGk2IdtZzaj7SFntXj72NppTA= +gopkg.in/retry.v1 v1.0.3/go.mod h1:FJkXmWiMaAo7xB+xhvDF59zhfjDWyzmyAxiT4dB688g= gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7 h1:uRGJdciOHaEIrze2W8Q3AKkepLTh2hOroT7a+7czfdQ= gopkg.in/tomb.v1 v1.0.0-20141024135613-dd632973f1e7/go.mod h1:dt/ZhP58zS4L8KSrWDmTeBkI65Dw0HsyUHuEVlX15mw= +gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.2.3/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= +gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI= gopkg.in/yaml.v2 v2.4.0 h1:D8xgwECY7CYvx+Y2n4sBz93Jn9JRvxdiyyo8CTfuKaY= gopkg.in/yaml.v2 v2.4.0/go.mod h1:RDklbk79AGWmwhnvt/jBztapEOGDOx6ZbXqjP6csGnQ= +gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA= +gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM= +honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= +honnef.co/go/tools v0.0.0-20190523083050-ea95bdfd59fc/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4= diff --git a/main.go b/main.go index 06f055e..88360d4 100644 --- a/main.go +++ b/main.go @@ -5,26 +5,14 @@ import ( "encoding/json" "errors" "fmt" + "github.com/confluentinc/confluent-kafka-go/kafka" + "github.com/go-redis/redis/v8" + "github.com/gorilla/mux" + "gopkg.in/yaml.v2" "log" "net/http" "os" - "sync" "time" - - "github.com/go-redis/redis/v8" - "github.com/gorilla/mux" - "github.com/gorilla/websocket" - "gopkg.in/yaml.v2" -) - -var ( - upgrader = websocket.Upgrader{ - CheckOrigin: func(r *http.Request) bool { - return true - }, - } - redisClient *redis.Client - ctx = context.Background() ) type Message struct { @@ -40,16 +28,11 @@ type Config struct { Host string `yaml:"host"` Port string `yaml:"port"` } -} - -type Client struct { - conn *websocket.Conn -} - -type Server struct { - clients map[*Client]bool - broadcast chan Message - mu sync.Mutex + Kafka struct { + Host string `yaml:"host"` + Port string `yaml:"port"` + Topic string `yaml:"topic"` + } } func getConfig(configPath string) (*Config, error) { @@ -87,8 +70,8 @@ func loadConfig() *Config { return cfg } -func initRedis(cfg Config) { - redisClient = redis.NewClient(&redis.Options{ +func initRedis(cfg Config, ctx context.Context) *redis.Client { + redisClient := redis.NewClient(&redis.Options{ Addr: cfg.Redis.Host + ":" + cfg.Redis.Port, }) _, err := redisClient.Do(context.Background(), "CONFIG", "SET", "notify-keyspace-events", "KEA").Result() @@ -97,138 +80,24 @@ func initRedis(cfg Config) { os.Exit(1) } redisClient.ConfigSet(ctx, "notify-keyspace-events", "Ex") + return redisClient } -func newServer() *Server { - return &Server{ - clients: make(map[*Client]bool), - broadcast: make(chan Message), - } -} +func initKafka(cfg Config) *kafka.Producer { + p, err := kafka.NewProducer(&kafka.ConfigMap{ + "bootstrap.servers": cfg.Kafka.Host + ":" + cfg.Kafka.Port, + "client.id": "myProducer", + "message.max.bytes": 15728640, + "acks": "all"}) -func (s *Server) addClient(client *Client) { - s.mu.Lock() - defer s.mu.Unlock() - s.clients[client] = true - broadcastAllRecordsToClient(client) -} - -func (s *Server) removeClient(client *Client) { - s.mu.Lock() - defer s.mu.Unlock() - if _, ok := s.clients[client]; ok { - delete(s.clients, client) - err := client.conn.Close() - if err != nil { - return - } - } -} - -func (s *Server) handleConnections(w http.ResponseWriter, r *http.Request) { - conn, err := upgrader.Upgrade(w, r, nil) if err != nil { - fmt.Printf("Error upgrading connection: %v\n", err) - return - } - - client := &Client{conn: conn} - s.addClient(client) - - defer s.removeClient(client) - - for { - _, msgContent, err := conn.ReadMessage() - if err != nil { - fmt.Printf("Error reading message: %v\n", err) - break - } - - var message Message - err = json.Unmarshal(msgContent, &message) - if err != nil { - log.Fatalf("Unable to marshal JSON due to %s", err) - } - fmt.Printf("Broadcasting ws message to %d clients", s.clients) - s.broadcast <- message + fmt.Printf("Failed to create producer: %s\n", err) + os.Exit(1) } + return p } -func broadcastAllRecords(s *Server) { - allRecords, err := fetchAllRecords() - if err != nil { - log.Println("Error fetching all records:", err) - } - if len(allRecords) > 0 { - var message Message - for _, msgContent := range allRecords { - err = json.Unmarshal([]byte(msgContent), &message) - if err != nil { - log.Println("Unable to marshal JSON due to: ", err) - } - fmt.Printf("Broadcasting %s,%s,%s,%s to %d clients\n", message.Id, message.Status, message.Name, message.Timestamp, len(s.clients)) - - for client := range s.clients { - if err := client.conn.WriteMessage(websocket.TextMessage, []byte(msgContent)); err != nil { - log.Println("Failed to broadcast update:", err) - } - } - } - } -} - -func broadcastRemovedRecords(s *Server, message Message) { - var msgJSON, err = json.Marshal(message) - if err != nil { - log.Println("Error marshalling json:", err) - return - } - fmt.Printf("Broadcasting removal: %s,%s,%s,%s to %d clients\n", message.Id, message.Status, message.Name, message.Timestamp, len(s.clients)) - - for client := range s.clients { - if err := client.conn.WriteMessage(websocket.TextMessage, msgJSON); err != nil { - log.Println("Failed to broadcast update:", err) - return - } - } -} - -func broadcastExpiredRecords(s *Server, removed string) { - var message = Message{Id: removed, Name: "", Image: "", Status: "removed", Timestamp: ""} - var msgJSON, err = json.Marshal(message) - if err != nil { - log.Println("Error marshalling json:", err) - return - } - fmt.Printf("Broadcasting expiration: %s to %s clients\n", string(msgJSON), len(s.clients)) - for client := range s.clients { - if err := client.conn.WriteMessage(websocket.TextMessage, msgJSON); err != nil { - log.Println("Failed to broadcast update:", err) - return - } - } -} - -func broadcastAllRecordsToClient(c *Client) { - allRecords, err := fetchAllRecords() - if err != nil { - log.Println("Error fetching all records:", err) - } - fmt.Printf("Broadcasting %d records to client\n", len(allRecords)) - var message Message - for _, msgContent := range allRecords { - err = json.Unmarshal([]byte(msgContent), &message) - if err != nil { - log.Println("Unable to marshal JSON due to: ", err) - } - fmt.Printf("Broadcasting %s,%s,%s,%s\n", message.Id, message.Status, message.Name, message.Timestamp) - if err := c.conn.WriteMessage(websocket.TextMessage, []byte(msgContent)); err != nil { - log.Println("Failed to broadcast update:", err) - } - } -} - -func (s *Server) listenForExpirationEvents() { +func listenForExpirationEvents(redisClient *redis.Client, kafkaClient *kafka.Producer, ctx context.Context, config Config) { ps := redisClient.PSubscribe(ctx, "__keyevent@0__:expired") defer func(ps *redis.PubSub) { err := ps.Close() @@ -237,17 +106,45 @@ func (s *Server) listenForExpirationEvents() { } }(ps) - for msg := range ps.Channel() { - // Extract expired payload ID - expiredID := msg.Payload - fmt.Println(expiredID) + for exp := range ps.Channel() { + //Print expired payload ID + fmt.Println(exp.Payload) // Broadcast expiration event - broadcastExpiredRecords(s, expiredID) + msg := Message{} + broadcastRecord(kafkaClient, msg, config.Kafka.Topic) fmt.Printf("Done Broadcasting Expiration\n") } } -func fetchAllRecords() (map[string]string, error) { +func broadcastRecord(kafkaClient *kafka.Producer, msg Message, topic string) { + var msgJSON, err = json.Marshal(msg) + if err != nil { + log.Println("Error marshalling json:", err) + return + } + err = kafkaClient.Produce(&kafka.Message{ + TopicPartition: kafka.TopicPartition{Topic: &topic, Partition: kafka.PartitionAny}, + Value: msgJSON}, + nil, // delivery channel + ) + if err != nil { + log.Println("Error publishing message:", err) + return + } + for e := range kafkaClient.Events() { + switch ev := e.(type) { + case *kafka.Message: + if ev.TopicPartition.Error != nil { + fmt.Printf("Failed to deliver message: %v\n", ev.TopicPartition) + } else { + fmt.Printf("Successfully produced record to topic %s partition [%d] @ offset %v\n", + *ev.TopicPartition.Topic, ev.TopicPartition.Partition, ev.TopicPartition.Offset) + } + } + } +} + +func fetchAllRecords(redisClient *redis.Client, ctx context.Context) (map[string]string, error) { allKeys, err := redisClient.Keys(ctx, "*").Result() if err != nil { return nil, fmt.Errorf("could not fetch keys: %v", err) @@ -267,7 +164,7 @@ func fetchAllRecords() (map[string]string, error) { return records, nil } -func getState(w http.ResponseWriter, r *http.Request) { +func getStatus(w http.ResponseWriter, r *http.Request, redisClient *redis.Client, ctx context.Context) { if r.Method != http.MethodPost { http.Error(w, "Only POST method is allowed", http.StatusMethodNotAllowed) return @@ -320,54 +217,53 @@ func getState(w http.ResponseWriter, r *http.Request) { } } -func setState(w http.ResponseWriter, r *http.Request, s *Server) { +func setStatus(w http.ResponseWriter, r *http.Request, redisClient *redis.Client, kafkaClient *kafka.Producer, ctx context.Context, config Config) { if r.Method != http.MethodPost { http.Error(w, "Only POST method is allowed", http.StatusMethodNotAllowed) return } - var message Message - err := json.NewDecoder(r.Body).Decode(&message) - if err != nil || message.Id == "" || message.Status == "" { + var msg Message + err := json.NewDecoder(r.Body).Decode(&msg) + if err != nil || msg.Id == "" || msg.Status == "" { http.Error(w, "Invalid request format", http.StatusBadRequest) return } - if message.Status == "none" { - if err := redisClient.Del(ctx, message.Id).Err(); err != nil { + if msg.Status == "none" { + if err := redisClient.Del(ctx, msg.Id).Err(); err != nil { log.Printf("Error deleting key from Redis: %v", err) http.Error(w, "Failed to delete key from Redis", http.StatusInternalServerError) + w.WriteHeader(http.StatusInternalServerError) + return + } + } else { + msgJSON, err := json.Marshal(msg) + if err != nil { + http.Error(w, "Failed to encode message", http.StatusInternalServerError) + w.WriteHeader(http.StatusInternalServerError) return } - broadcastRemovedRecords(s, message) - w.WriteHeader(http.StatusOK) - return - } - msgJSON, err := json.Marshal(message) - if err != nil { - http.Error(w, "Failed to encode message", http.StatusInternalServerError) - return - } + timeout := 20 * time.Second - timeout := 20 * time.Second - err = redisClient.Set(ctx, message.Id, msgJSON, timeout).Err() - if err != nil { - log.Printf("Failed to set key in Redis: %v", err) - http.Error(w, "Failed to store data", http.StatusInternalServerError) - return + if err = redisClient.Set(ctx, msg.Id, msgJSON, timeout).Err(); err != nil { + log.Printf("Failed to set key in Redis: %v", err) + http.Error(w, "Failed to store data", http.StatusInternalServerError) + w.WriteHeader(http.StatusInternalServerError) + return + } } - - broadcastAllRecords(s) + broadcastRecord(kafkaClient, msg, config.Kafka.Topic) w.WriteHeader(http.StatusOK) } -func updateState(w http.ResponseWriter, r *http.Request) { +func updateMessages(w http.ResponseWriter, r *http.Request, redisClient *redis.Client, ctx context.Context) { if r.Method != http.MethodGet { http.Error(w, "Only GET method is allowed", http.StatusMethodNotAllowed) return } - allRecords, err := fetchAllRecords() + allRecords, err := fetchAllRecords(redisClient, ctx) if err != nil { log.Printf("Error fetching records: %v", err) http.Error(w, "Failed to fetch records", http.StatusInternalServerError) @@ -405,29 +301,35 @@ func enableCORS(next http.Handler) http.Handler { w.WriteHeader(http.StatusOK) return } - next.ServeHTTP(w, r) }) } func main() { - initRedis(*loadConfig()) + log.Println("Starting Pogdark API") + ctx := context.Background() + config := loadConfig() + redisClient := initRedis(*config, ctx) + log.Println("Redis initiated") + kafkaClient := initKafka(*config) + log.Println("Kafka initiated") - server := newServer() router := mux.NewRouter() // Register routes on the mux router - router.HandleFunc("/ws", server.handleConnections).Methods("GET") - router.HandleFunc("/get", getState).Methods("POST") - router.HandleFunc("/set", func(w http.ResponseWriter, r *http.Request) { - setState(w, r, server) + router.HandleFunc("/getStatus", func(w http.ResponseWriter, r *http.Request) { + getStatus(w, r, redisClient, ctx) }).Methods("POST") - router.HandleFunc("/update", updateState).Methods("GET") - corsRouter := enableCORS(router) + router.HandleFunc("/setStatus", func(w http.ResponseWriter, r *http.Request) { + setStatus(w, r, redisClient, kafkaClient, ctx, *config) + }).Methods("POST") + router.HandleFunc("/updateMessages", func(w http.ResponseWriter, r *http.Request) { + updateMessages(w, r, redisClient, ctx) + }).Methods("GET") // Start server and other necessary goroutines - go server.listenForExpirationEvents() - + go listenForExpirationEvents(redisClient, kafkaClient, ctx, *config) + corsRouter := enableCORS(router) // Pass the mux router to ListenAndServe fmt.Println("Server started on :8080") err := http.ListenAndServe(":8080", corsRouter)