Function SetupCursorPagePreamble

pg_documentdb/src/commands/cursors.c:2476–2507

* Set-up the preamble for the cursor page - including the cursorId (which will be * overwritten later), the namespace, and sets up the documents array. */

 * overwritten later), the namespace, and sets up the documents array.
 */
void
SetupCursorPagePreamble(pgbson_writer *topLevelWriter, pgbson_writer *cursorDoc,
						pgbson_array_writer *arrayWriter,
						const char *namespaceName, bool isFirstPage,
						uint32_t *accumulatedLength)
{
	PgbsonWriterInit(topLevelWriter);

	/* Write the preface */
	PgbsonWriterStartDocument(topLevelWriter, "cursor", 6, cursorDoc);

	/* Write the cursor ID, this is overwritten later */
	PgbsonWriterAppendInt64(cursorDoc, "id", 2, 0);

	/* write the namespace */
	PgbsonWriterAppendUtf8(cursorDoc, "ns", 2, namespaceName);

	*accumulatedLength += PgbsonWriterGetSize(cursorDoc);

	/* Write the documents */
	const char *pathName = "firstBatch";
	if (!isFirstPage)
	{
		pathName = "nextBatch";
	}

	uint32_t pathLength = strlen(pathName);
	*accumulatedLength += pathLength;

	PgbsonWriterStartArray(cursorDoc, pathName, pathLength, arrayWriter);
	*accumulatedLength += 5;
}


/*