He-Pin commented on code in PR #744:
URL: https://github.com/apache/pekko-http/pull/744#discussion_r2357575435


##########
http/src/main/scala/org/apache/pekko/http/scaladsl/unmarshalling/sse/LineParser.scala:
##########
@@ -43,44 +55,86 @@ private final class LineParser(maxLineSize: Int) extends 
GraphStage[FlowShape[By
 
       private var buffer = ByteString.empty
       private var lastCharWasCr = false
+      private lazy val log = Logging(materializer.system, classOf[LineParser])
 
       setHandlers(in, out, this)
 
       override def onPush() = {
+        def handleLineOversized(lineLength: Int, line: String): Option[String] 
= {
+          oversizedStrategy match {
+            case OversizedSseStrategy.FailStream =>
+              failStage(new IllegalStateException(
+                s"SSE line size: $lineLength exceeds max-line-size: 
$maxLineSize. " +
+                s"Configure pekko.http.sse.max-line-size or use 
oversized-message-handling setting."))
+              None
+            case OversizedSseStrategy.LogAndSkip =>
+              log.warning("Skipping oversized SSE message: {} bytes > {} 
max-line-size", lineLength, maxLineSize)
+              None
+            case OversizedSseStrategy.Truncate =>
+              log.info("Truncating oversized SSE message: {} bytes > {} 
max-line-size", lineLength, maxLineSize)
+              Some(line.take(maxLineSize))
+            case OversizedSseStrategy.DeadLetter =>
+              materializer.system.deadLetters ! OversizedSseLine(line)
+              None
+          }
+        }
+
         @tailrec
         def parseLines(
             bs: ByteString,
             from: Int = 0,
             at: Int,
             parsedLines: Vector[String] = Vector.empty,
-            lastCharWasCr: Boolean = false): (ByteString, Vector[String], 
Boolean) =
+            lastCharWasCr: Boolean): (ByteString, Vector[String], Boolean) =
           if (at >= bs.length)
             (bs.drop(from), parsedLines, lastCharWasCr)
           else
             bs(at) match {
               case CR if at < bs.length - 1 && bs(at + 1) == LF =>
                 // Lookahead for LF after CR
-                parseLines(bs, at + 2, at + 2, parsedLines :+ bs.slice(from, 
at).utf8String)
+                val lineLength = at - from

Review Comment:
   I think the `lineSize` should be changed to `lineByteSize` in the setting, 
because some Char will use two bytes but just count as one char.
   
   Here, the code seems like count the bytes



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