Пример #1
0
// AppendLogChunk appends a logchunk to an artifact.
// If the logchunk position does not match the current end of artifact, an error is returned.
// An exception to this is made when the last seen logchunk is repeated, which is silently ignored
// without an error.
func AppendLogChunk(ctx context.Context, db database.Database, artifact *model.Artifact, logChunkReq *createLogChunkReq) *HttpError {
	if artifact.State != model.APPENDING {
		return NewHttpError(http.StatusBadRequest, fmt.Sprintf("Unexpected artifact state: %s", artifact.State))
	}

	if logChunkReq.Size <= 0 {
		return NewHttpError(http.StatusBadRequest, "Invalid chunk size %d", logChunkReq.Size)
	}

	var contentBytes []byte
	if len(logChunkReq.Bytes) != 0 {
		// If request sent Bytes, use Bytes.
		if int64(len(logChunkReq.Bytes)) != logChunkReq.Size {
			return NewHttpError(http.StatusBadRequest, "Content length %d does not match indicated size %d", len(logChunkReq.Bytes), logChunkReq.Size)
		}
		contentBytes = logChunkReq.Bytes
	} else {
		// Otherwise, allow Content, for now.
		if len(logChunkReq.Content) == 0 {
			return NewHttpError(http.StatusBadRequest, "Empty content string")
		}

		if int64(len(logChunkReq.Content)) != logChunkReq.Size {
			return NewHttpError(http.StatusBadRequest, "Content length %d does not match indicated size %d", len(logChunkReq.Content), logChunkReq.Size)
		}
		contentBytes = []byte(logChunkReq.Content)
	}

	// Find previous chunk in DB - append only
	nextByteOffset := artifact.Size
	if nextByteOffset != logChunkReq.ByteOffset {
		// There is a possibility the previous logchunk is being retried - we need to handle cases where
		// a server/proxy time out caused the client not to get an ACK when it successfully uploaded the
		// previous logchunk, due to which it is retrying.
		//
		// This is a best-effort check - if we encounter DB errors or any mismatch in the chunk
		// contents, we ignore this test and claim that a range mismatch occured.
		if nextByteOffset != 0 && nextByteOffset == logChunkReq.ByteOffset+logChunkReq.Size {
			if prevLogChunk, err := db.GetLastLogChunkSeenForArtifact(artifact.Id); err == nil {
				if prevLogChunk != nil && prevLogChunk.ByteOffset == logChunkReq.ByteOffset && prevLogChunk.Size == logChunkReq.Size && bytes.Equal(prevLogChunk.ContentBytes, contentBytes) {
					sentry.ReportMessage(ctx, fmt.Sprintf("Received duplicate chunk for artifact %v of size %d at byte %d", artifact.Id, logChunkReq.Size, logChunkReq.ByteOffset))
					return nil
				}
			}
		}

		return NewHttpError(http.StatusBadRequest, "Overlapping ranges detected, expected offset: %d, actual offset: %d", nextByteOffset, logChunkReq.ByteOffset)
	}

	// Expand artifact size - redundant after above change.
	if artifact.Size < logChunkReq.ByteOffset+logChunkReq.Size {
		artifact.Size = logChunkReq.ByteOffset + logChunkReq.Size
		if err := db.UpdateArtifact(artifact); err != nil {
			return NewHttpError(http.StatusInternalServerError, err.Error())
		}
	}

	logChunk := &model.LogChunk{
		ArtifactId:   artifact.Id,
		ByteOffset:   logChunkReq.ByteOffset,
		ContentBytes: contentBytes,
		Size:         logChunkReq.Size,
	}

	if err := db.InsertLogChunk(logChunk); err != nil {
		return NewHttpError(http.StatusBadRequest, "Error updating log chunk: %s", err)
	}
	return nil
}