|
| 1 | +package handlers |
| 2 | + |
| 3 | +import ( |
| 4 | + "fmt" |
| 5 | + "github.com/gofiber/fiber/v2" |
| 6 | + "github.com/memphisdev/memphis.go" |
| 7 | + "rest-gateway/logger" |
| 8 | + "rest-gateway/models" |
| 9 | + "strconv" |
| 10 | + "strings" |
| 11 | + "time" |
| 12 | +) |
| 13 | + |
| 14 | +type requestBody struct { |
| 15 | + ConsumerName string `json:"consumer_name"` |
| 16 | + ConsumerGroup string `json:"consumer_group"` |
| 17 | + BatchSize int `json:"batch_size"` |
| 18 | + BatchMaxWaitTimeMs int `json:"batch_max_wait_time_ms"` |
| 19 | + MaxMsgDeliveries int `json:"max_msg_deliveries"` |
| 20 | +} |
| 21 | + |
| 22 | +func (r *requestBody) initializeDefaults() { |
| 23 | + if r.ConsumerGroup == "" { |
| 24 | + r.ConsumerGroup = r.ConsumerName |
| 25 | + } |
| 26 | + if r.BatchSize == 0 { |
| 27 | + r.BatchSize = 10 |
| 28 | + } |
| 29 | + if r.BatchMaxWaitTimeMs == 0 { |
| 30 | + r.BatchMaxWaitTimeMs = 5000 |
| 31 | + } |
| 32 | + if r.MaxMsgDeliveries == 0 { |
| 33 | + r.MaxMsgDeliveries = 10 |
| 34 | + } |
| 35 | +} |
| 36 | + |
| 37 | +func ConsumeHandleMessage() func(*fiber.Ctx) error { |
| 38 | + return func(c *fiber.Ctx) error { |
| 39 | + log := logger.GetLogger(c) |
| 40 | + url := c.Request().URI().String() |
| 41 | + urlParts := strings.Split(url, "/") |
| 42 | + stationName := urlParts[4] |
| 43 | + reqBody := requestBody{} |
| 44 | + err := c.BodyParser(&reqBody) |
| 45 | + if err != nil { |
| 46 | + log.Errorf("ConsumeHandleMessage - parse request body: %s", err.Error()) |
| 47 | + c.Status(fiber.StatusBadRequest) |
| 48 | + return c.JSON(&fiber.Map{ |
| 49 | + "success": false, |
| 50 | + "error": "Invalid request body", |
| 51 | + }) |
| 52 | + } |
| 53 | + if reqBody.ConsumerName == "" { |
| 54 | + c.Status(fiber.StatusBadRequest) |
| 55 | + return c.JSON(&fiber.Map{ |
| 56 | + "success": false, |
| 57 | + "error": "Consumer name is required", |
| 58 | + }) |
| 59 | + } |
| 60 | + userData, ok := c.Locals("userData").(models.AuthSchema) |
| 61 | + if !ok { |
| 62 | + log.Errorf("ConsumeHandleMessage: failed to get the user data from the middleware") |
| 63 | + c.Status(fiber.StatusInternalServerError) |
| 64 | + return c.JSON(&fiber.Map{ |
| 65 | + "success": false, |
| 66 | + "error": "Server error", |
| 67 | + }) |
| 68 | + } |
| 69 | + username := userData.Username |
| 70 | + accountId := userData.AccountId |
| 71 | + accountIdStr := strconv.Itoa(int(accountId)) |
| 72 | + conn := ConnectionsCache[accountIdStr][username].Connection |
| 73 | + if conn == nil { |
| 74 | + errMsg := fmt.Sprintf("Connection does not exist") |
| 75 | + log.Errorf("ConsumeHandleMessage - consume: %s", errMsg) |
| 76 | + |
| 77 | + c.Status(fiber.StatusInternalServerError) |
| 78 | + return c.JSON(&fiber.Map{ |
| 79 | + "success": false, |
| 80 | + "error": "Server error", |
| 81 | + }) |
| 82 | + } |
| 83 | + reqBody.initializeDefaults() |
| 84 | + msgs, err := conn.FetchMessages(stationName, reqBody.ConsumerName, |
| 85 | + memphis.FetchBatchSize(reqBody.BatchSize), |
| 86 | + memphis.FetchConsumerGroup(reqBody.ConsumerGroup), |
| 87 | + memphis.FetchBatchMaxWaitTime(time.Duration(reqBody.BatchMaxWaitTimeMs)*time.Millisecond), |
| 88 | + memphis.FetchMaxMsgDeliveries(reqBody.MaxMsgDeliveries)) |
| 89 | + |
| 90 | + if err != nil { |
| 91 | + log.Errorf("ConsumeHandleMessage - fetch messages: %s", err.Error()) |
| 92 | + c.Status(fiber.StatusInternalServerError) |
| 93 | + return c.JSON(&fiber.Map{ |
| 94 | + "success": false, |
| 95 | + "error": "Server error", |
| 96 | + }) |
| 97 | + } |
| 98 | + |
| 99 | + type message struct { |
| 100 | + Message string `json:"message"` |
| 101 | + Headers map[string]string `json:"headers"` |
| 102 | + } |
| 103 | + messages := []message{} |
| 104 | + |
| 105 | + for _, msg := range msgs { |
| 106 | + err := msg.Ack() |
| 107 | + if err != nil { |
| 108 | + log.Errorf("ConsumeHandleMessage - acknowledge message: %s", err) |
| 109 | + } |
| 110 | + messages = append(messages, message{ |
| 111 | + Message: string(msg.Data()), |
| 112 | + Headers: msg.GetHeaders(), |
| 113 | + }) |
| 114 | + } |
| 115 | + c.Status(fiber.StatusOK) |
| 116 | + return c.JSON(&messages) |
| 117 | + } |
| 118 | +} |
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