Slack utils

slack_utils/slack_utils.go

@@ -51,48 +51,61 @@ func (s *SlackClient) SendAlertWithFields(message string, channel string, slackF
 		return ""
 	}
 
-	blocks := []slack.Block{slack.NewSectionBlock(slack.NewTextBlockObject(
-		"plain_text",
-		message,
-		hasEmoji(message),
-		false),
-		nil,
-		nil,
-	),
-	}
+	slackFieldsPerMessage := lo.Chunk(slackFields, 50) // Slack has a limit of 50 blocks per message
+
+	var messageTimestamp string
+	for i, slackFieldsForMessage := range slackFieldsPerMessage {
+		messageText := message
+		if len(slackFieldsPerMessage) > 1 {
+			messageText = fmt.Sprintf("%s (%d/%d)", message, i+1, len(slackFieldsPerMessage))
+		}
 
-	slackFieldsChunked := lo.Chunk(slackFields, 2)
+		blocks := []slack.Block{slack.NewSectionBlock(slack.NewTextBlockObject(
+			"plain_text",
+			messageText,
+			hasEmoji(messageText),
+			false),
+			nil,
+			nil,
+		),
+		}
 
-	for _, slackFieldsChunk := range slackFieldsChunked {
-		fieldBlocksForChunk := []*slack.TextBlockObject{}
-		for _, slackField := range slackFieldsChunk {
-			slackFieldValue := slackField.Value
-			// if slackField.Value is a pointer, dereference it
-			if reflect.ValueOf(slackField.Value).Kind() == reflect.Ptr {
-				slackFieldValue = reflect.ValueOf(slackField.Value).Elem().Interface()
+		slackFieldsChunked := lo.Chunk(slackFieldsForMessage, 2)
+
+		for _, slackFieldsChunk := range slackFieldsChunked {
+			fieldBlocksForChunk := []*slack.TextBlockObject{}
+			for _, slackField := range slackFieldsChunk {
+				slackFieldValue := slackField.Value
+				// if slackField.Value is a pointer, dereference it
+				if reflect.ValueOf(slackField.Value).Kind() == reflect.Ptr {
+					slackFieldValue = reflect.ValueOf(slackField.Value).Elem().Interface()
+				}
+
+				text := fmt.Sprintf("*%s*\n%v", slackField.Label, slackFieldValue)
+				fieldBlocksForChunk = append(fieldBlocksForChunk, slack.NewTextBlockObject(
+					"mrkdwn",
+					text,
+					false,
+					false,
+				))
 			}
 
-			text := fmt.Sprintf("*%s*\n%v", slackField.Label, slackFieldValue)
-			fieldBlocksForChunk = append(fieldBlocksForChunk, slack.NewTextBlockObject(
-				"mrkdwn",
-				text,
-				false,
-				false,
-			))
+			blocks = append(blocks, slack.NewSectionBlock(nil, fieldBlocksForChunk, nil))
 		}
 
-		blocks = append(blocks, slack.NewSectionBlock(nil, fieldBlocksForChunk, nil))
-	}
+		slackMessageOptions := []slack.MsgOption{
+			slack.MsgOptionBlocks(blocks...),
+		}
 
-	slackMessageOptions := []slack.MsgOption{
-		slack.MsgOptionBlocks(blocks...),
-	}
+		if len(parentMessageTimestamp) > 0 {
+			slackMessageOptions = append(slackMessageOptions, slack.MsgOptionTS(parentMessageTimestamp[0]))
+		}
 
-	if len(parentMessageTimestamp) > 0 {
-		slackMessageOptions = append(slackMessageOptions, slack.MsgOptionTS(parentMessageTimestamp[0]))
+		messageTimestamp = s.postMessage(channel, slackMessageOptions)
 	}
 
-	return s.postMessage(channel, slackMessageOptions)
+	// Return the last message timestamp
+	return messageTimestamp
 }
 
 func (s *SlackClient) postMessage(channel string, messageOptions []slack.MsgOption) string {