/*
Build the IO vector. Return the count of bytes to be written. Return -1 for EOF.
*/
static MprOff buildNetVec(HttpQueue *q)
{
HttpConn *conn;
HttpTx *tx;
HttpPacket *packet;
conn = q->conn;
tx = conn->tx;
/*
Examine each packet and accumulate as many packets into the I/O vector as possible. Leave the packets on the queue
for now, they are removed after the IO is complete for the entire packet.
*/
for (packet = q->first; packet; packet = packet->next) {
if (packet->flags & HTTP_PACKET_HEADER) {
if (tx->chunkSize <= 0 && q->count > 0 && tx->length < 0) {
/* Incase no chunking filter and we've not seen all the data yet */
conn->keepAliveCount = 0;
}
httpWriteHeaders(conn, packet);
q->count += httpGetPacketLength(packet);
} else if (httpGetPacketLength(packet) == 0) {
q->flags |= HTTP_QUEUE_EOF;
if (packet->prefix == NULL) {
break;
}
}
if (q->ioIndex >= (HTTP_MAX_IOVEC - 2)) {
break;
}
addPacketForNet(q, packet);
}
return q->ioCount;
}
/*
Build the IO vector. This connector uses the send file API which permits multiple IO blocks to be written with
file data. This is used to write transfer the headers and chunk encoding boundaries. Return the count of bytes to
be written. Return -1 for EOF.
*/
static MprOff buildSendVec(HttpQueue *q)
{
HttpPacket *packet, *prev;
assert(q->ioIndex == 0);
q->ioCount = 0;
q->ioFile = 0;
/*
Examine each packet and accumulate as many packets into the I/O vector as possible. Can only have one data packet at
a time due to the limitations of the sendfile API (on Linux). And the data packet must be after all the
vector entries. Leave the packets on the queue for now, they are removed after the IO is complete for the
entire packet.
*/
for (packet = prev = q->first; packet && !(packet->flags & HTTP_PACKET_END); packet = packet->next) {
if (packet->flags & HTTP_PACKET_HEADER) {
httpWriteHeaders(q, packet);
}
if (q->ioFile || q->ioIndex >= (ME_MAX_IOVEC - 2)) {
/* Only one file entry allowed */
break;
}
if (packet->prefix || packet->esize || httpGetPacketLength(packet) > 0) {
addPacketForSend(q, packet);
} else {
/* Remove empty packets */
prev->next = packet->next;
continue;
}
prev = packet;
}
return q->ioCount;
}
