msgconv: log size breakdown of converted parts over the cut-off limit (#1047)

Co-authored-by: Indent <noreply@indent.com>

pkg/connector/backfill.go

@@ -293,18 +293,16 @@ func (wa *WhatsAppClient) handleWAHistorySync(
 		for i, rawMsg := range rawMessages {
 			// Don't store messages that will just be skipped.
 			msgEvt, err := wa.Client.ParseWebMessage(jid, rawMsg.GetMessage())
-			if err != nil {
-				rawMsgType := getMessageType(rawMsg.GetMessage().GetMessage())
-				if rawMsgType == "ignore" {
-					ignoredTypes++
-					continue
-				}
+			if err != nil && getMessageType(rawMsg.GetMessage().GetMessage()) == "ignore" {
+				ignoredTypes++
+				continue
+			} else if err != nil {
 				log.Warn().Err(err).
 					Int("msg_index", i).
 					Str("msg_id", rawMsg.GetMessage().GetKey().GetID()).
 					Uint64("msg_time_seconds", rawMsg.GetMessage().GetMessageTimestamp()).
 					Stringer("stub_type", rawMsg.GetMessage().GetMessageStubType()).
-					Str("message_type", rawMsgType).
+					Str("message_type", getMessageType(rawMsg.GetMessage().GetMessage())).
 					Bool("from_me", rawMsg.GetMessage().GetKey().GetFromMe()).
 					Msg("Dropping historical message due to parse error")
 				log.Trace().

pkg/msgconv/from-whatsapp.go

@@ -322,6 +322,7 @@ func (mc *MessageConverter) ToMatrix(
 		cm.ThreadRoot = ptr.Ptr(waid.MakeMessageID(chat, pcp, commentTarget.GetID()))
 	}
 	mc.cutOffLongMessage(part.Content)
+	logOversizedPart(ctx, part)
 
 	return cm
 }

pkg/msgconv/wa-text.go

@@ -18,6 +18,7 @@ package msgconv
 
 import (
 	"context"
+	"encoding/json"
 	"fmt"
 	"html"
 	"regexp"
@@ -25,6 +26,7 @@ import (
 	"strconv"
 	"strings"
 
+	"github.com/rs/zerolog"
 	"go.mau.fi/whatsmeow/proto/waE2E"
 	"maunium.net/go/mautrix/bridgev2"
 	"maunium.net/go/mautrix/event"
@@ -72,6 +74,36 @@ func (mc *MessageConverter) cutOffLongMessage(content *event.MessageEventContent
 	}
 }
 
+func logOversizedPart(ctx context.Context, part *bridgev2.ConvertedMessagePart) {
+	if part == nil || part.Content == nil {
+		return
+	}
+	contentJSON, _ := json.Marshal(part.Content)
+	extraJSON, _ := json.Marshal(part.Extra)
+	if len(contentJSON)+len(extraJSON) <= 40000 {
+		return
+	}
+	extraKeys := make([]string, 0, len(part.Extra))
+	for key := range part.Extra {
+		extraKeys = append(extraKeys, key)
+	}
+	var mentionCount int
+	if part.Content.Mentions != nil {
+		mentionCount = len(part.Content.Mentions.UserIDs)
+	}
+	linkPreviewJSON, _ := json.Marshal(part.Content.BeeperLinkPreviews)
+	zerolog.Ctx(ctx).Warn().
+		Str("msg_type", string(part.Content.MsgType)).
+		Int("content_json_size", len(contentJSON)).
+		Int("extra_json_size", len(extraJSON)).
+		Int("body_size", len(part.Content.Body)).
+		Int("formatted_body_size", len(part.Content.FormattedBody)).
+		Int("mention_count", mentionCount).
+		Int("link_preview_json_size", len(linkPreviewJSON)).
+		Strs("extra_keys", extraKeys).
+		Msg("Converted message part is larger than the cut-off limit")
+}
+
 func (mc *MessageConverter) parseFormatting(content *event.MessageEventContent, allowInlineURL, forceHTML bool) {
 	parsedHTML := parseWAFormattingToHTML(content.Body, allowInlineURL)
 	if forceHTML || parsedHTML != event.TextToHTML(content.Body) {