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#include "core.h"
#include <string.h>
#define NACK_RATE_UNIT 10000
static ssize_t _rbuf_send_flush(ECPConnection *conn, ECPTimerItem *ti) {
unsigned char payload[ECP_SIZE_PLD(0)];
ecp_pld_set_type(payload, ECP_MTYPE_RBFLUSH_REQ);
return ecp_pld_send(conn, payload, sizeof(payload));
}
static ssize_t handle_ack(ECPConnection *conn, ecp_seq_t seq, unsigned char mtype, unsigned char *msg, ssize_t size) {
ECPRBSend *buf;
ssize_t rsize = sizeof(ecp_seq_t)+sizeof(ecp_ack_t);
ecp_seq_t seq_ack = 0;
ecp_ack_t ack_map = 0;
int do_flush = 0;
int rv = ECP_OK;
buf = conn->rbuf.send;
if (buf == NULL) return ECP_ERR;
if (size < 0) return size;
if (size < rsize) return ECP_ERR;
seq_ack = \
(msg[0] << 24) | \
(msg[1] << 16) | \
(msg[2] << 8) | \
(msg[3]);
ack_map = \
(msg[4] << 24) | \
(msg[5] << 16) | \
(msg[6] << 8) | \
(msg[7]);
#ifdef ECP_WITH_PTHREAD
pthread_mutex_lock(&buf->mutex);
#endif
ECPRBuffer *rbuf = &buf->rbuf;
int idx = ecp_rbuf_msg_idx(rbuf, seq_ack);
if (idx < 0) rv = idx;
int is_reliable = buf->flags & ECP_RBUF_FLAG_RELIABLE;
if (!rv) {
seq_ack++;
buf->in_transit -= seq_ack - rbuf->seq_start;
if (ack_map != ECP_RBUF_ACK_FULL) {
int i;
int nack_first = 0;
unsigned int msg_start;
ecp_seq_t seq_start;
ecp_win_t nack_cnt = 0;
seq_ack -= ECP_RBUF_ACK_SIZE;
#ifdef ECP_WITH_PTHREAD
pthread_mutex_unlock(&buf->mutex);
#endif
for (i=0; i<ECP_RBUF_ACK_SIZE; i++) {
if ((ack_map & ((ecp_ack_t)1 << (ECP_RBUF_ACK_SIZE - i - 1))) == 0) {
nack_cnt++;
if (buf->flags & ECP_RBUF_FLAG_RELIABLE) {
idx = ECP_RBUF_IDX_MASK(idx + 1 - ECP_RBUF_ACK_SIZE + i, rbuf->msg_size);
ecp_pkt_send(conn->sock, &conn->node.addr, rbuf->msg[idx].msg, rbuf->msg[idx].size);
if (!nack_first) {
nack_first = 1;
seq_start = seq_ack + i;
msg_start = idx;
}
}
}
}
#ifdef ECP_WITH_PTHREAD
pthread_mutex_lock(&buf->mutex);
#endif
buf->in_transit += nack_cnt;
buf->nack_rate = (buf->nack_rate * 7 + ((ECP_RBUF_ACK_SIZE - nack_cnt) * NACK_RATE_UNIT) / ECP_RBUF_ACK_SIZE) / 8;
if (buf->flags & ECP_RBUF_FLAG_RELIABLE) {
rbuf->seq_start = seq_start;
rbuf->msg_start = msg_start;
} else {
rbuf->seq_start = seq_ack + ECP_RBUF_ACK_SIZE;
}
} else {
rbuf->seq_start = seq_ack;
buf->nack_rate = (buf->nack_rate * 7) / 8;
if (buf->flags & ECP_RBUF_FLAG_RELIABLE) {
rbuf->msg_start = ECP_RBUF_IDX_MASK(idx + 1, rbuf->msg_size);
}
}
if (buf->flush) {
if (ECP_RBUF_SEQ_LT(buf->seq_flush, rbuf->seq_start)) buf->flush = 0;
if (buf->flush) {
do_flush = 1;
}
}
}
#ifdef ECP_WITH_PTHREAD
pthread_mutex_unlock(&buf->mutex);
#endif
if (rv) return rv;
if (do_flush) ecp_timer_send(conn, _rbuf_send_flush, ECP_MTYPE_RBACK, 3, 500);
return rsize;
}
int ecp_conn_rbuf_send_create(ECPConnection *conn, ECPRBSend *buf, ECPRBMessage *msg, unsigned int msg_size) {
int rv;
memset(buf, 0, sizeof(ECPRBRecv));
rv = ecp_rbuf_init(&buf->rbuf, msg, msg_size);
if (rv) return rv;
conn->rbuf.send = buf;
return ECP_OK;
}
int ecp_conn_rbuf_send_start(ECPConnection *conn) {
ECPRBSend *buf = conn->rbuf.send;
if (buf == NULL) return ECP_ERR;
buf->rbuf.seq_start = conn->seq_out;
return ECP_OK;
}
int ecp_conn_rbuf_flush(ECPConnection *conn) {
ECPRBSend *buf = conn->rbuf.send;
unsigned char payload[ECP_SIZE_PLD(0)];
ecp_seq_t seq;
if (buf == NULL) return ECP_ERR;
// XXX flush seq
#ifdef ECP_WITH_PTHREAD
pthread_mutex_lock(&buf->mutex);
#endif
if (buf->flush) {
if (ECP_RBUF_SEQ_LT(buf->seq_flush, seq)) buf->seq_flush = seq;
} else {
buf->flush = 1;
buf->seq_flush = seq;
}
#ifdef ECP_WITH_PTHREAD
pthread_mutex_unlock(&buf->mutex);
#endif
ssize_t _rv = ecp_timer_send(conn, _rbuf_send_flush, ECP_MTYPE_RBACK, 3, 500);
if (_rv < 0) return _rv;
return ECP_OK;
}
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