/**
*发送下一个messsage
*/
struct msg *
rsp_send_next(struct context *ctx, struct conn *conn)
{
rstatus_t status;
struct msg *msg, *pmsg; /* response and it's peer request */
ASSERT(conn->client && !conn->proxy);
pmsg = TAILQ_FIRST(&conn->omsg_q);
if (pmsg == NULL || !req_done(conn, pmsg)) {//pmsg为空 并且请求未完成
/* nothing is outstanding, initiate close? */
if (pmsg == NULL && conn->eof) {//如果消息为假 并且连接eof为真
conn->done = 1;//请求完成
log_debug(LOG_INFO, "c %d is done", conn->sd);
}
//删除当前的请求
status = event_del_out(ctx->evb, conn);
if (status != NC_OK) {//删除失败
conn->err = errno;//设置连接错误码
}
return NULL;
}
//连接发送的信息
msg = conn->smsg;
if (msg != NULL) {
ASSERT(!msg->request && msg->peer != NULL);
ASSERT(req_done(conn, msg->peer));
pmsg = TAILQ_NEXT(msg->peer, c_tqe);
}
if (pmsg == NULL || !req_done(conn, pmsg)) {
conn->smsg = NULL;
return NULL;
}
ASSERT(pmsg->request && !pmsg->swallow);
if (req_error(conn, pmsg)) {//如果有error
msg = rsp_make_error(ctx, conn, pmsg);
if (msg == NULL) {
conn->err = errno;
return NULL;
}
msg->peer = pmsg;
pmsg->peer = msg;
stats_pool_incr(ctx, conn->owner, forward_error);
} else {
msg = pmsg->peer;
}
//获取msg
ASSERT(!msg->request);
conn->smsg = msg;
log_debug(LOG_VVERB, "send next rsp %"PRIu64" on c %d", msg->id, conn->sd);
return msg;
}
struct msg *
rsp_send_next(struct context *ctx, struct conn *conn)
{
rstatus_t status;
struct msg *rsp, *req; /* response and it's peer request */
ASSERT_LOG((conn->type == CONN_DNODE_PEER_CLIENT) ||
(conn->type = CONN_CLIENT), "conn %s", conn_get_type_string(conn));
req = TAILQ_FIRST(&conn->omsg_q);
if (req == NULL || (!req->selected_rsp && !req_done(conn, req))) {
/* nothing is outstanding, initiate close? */
if (req == NULL && conn->eof) {
conn->done = 1;
log_debug(LOG_INFO, "c %d is done", conn->sd);
}
status = event_del_out(ctx->evb, conn);
if (status != DN_OK) {
conn->err = errno;
}
return NULL;
}
rsp = conn->smsg;
if (rsp != NULL) {
ASSERT(!rsp->request);
ASSERT(rsp->peer != NULL);
req = TAILQ_NEXT(rsp->peer, c_tqe);
}
if (req == NULL || !req_done(conn, req)) {
conn->smsg = NULL;
return NULL;
}
ASSERT(req->request && !req->swallow);
if (req_error(conn, req)) {
rsp = rsp_make_error(ctx, conn, req);
if (rsp == NULL) {
conn->err = errno;
return NULL;
}
rsp->peer = req;
req->selected_rsp = rsp;
log_debug(LOG_VERB, "creating new error rsp %p", rsp);
if (conn->dyn_mode) {
stats_pool_incr(ctx, peer_forward_error);
} else {
stats_pool_incr(ctx, forward_error);
}
} else {
rsp = req->selected_rsp;
}
ASSERT(!rsp->request);
conn->smsg = rsp;
if (log_loggable(LOG_VVERB)) {
log_debug(LOG_VVERB, "send next rsp %"PRIu64" on c %d", rsp->id, conn->sd);
}
return rsp;
}
struct msg *
rsp_send_next(struct context *ctx, struct conn *conn)
{
rstatus_t status;
struct msg *msg, *pmsg; /* response and it's peer request */
ASSERT((conn->client && !conn->proxy) || (conn->dnode_client && !conn->dnode_server));
pmsg = TAILQ_FIRST(&conn->omsg_q);
if (pmsg == NULL || !req_done(conn, pmsg)) {
/* nothing is outstanding, initiate close? */
if (pmsg == NULL && conn->eof) {
conn->done = 1;
log_debug(LOG_INFO, "c %d is done", conn->sd);
}
status = event_del_out(ctx->evb, conn);
if (status != DN_OK) {
conn->err = errno;
}
return NULL;
}
msg = conn->smsg;
if (msg != NULL) {
ASSERT(!msg->request && msg->peer != NULL);
ASSERT(req_done(conn, msg->peer));
pmsg = TAILQ_NEXT(msg->peer, c_tqe);
}
if (pmsg == NULL || !req_done(conn, pmsg)) {
conn->smsg = NULL;
return NULL;
}
ASSERT(pmsg->request && !pmsg->swallow);
if (req_error(conn, pmsg)) {
msg = rsp_make_error(ctx, conn, pmsg);
if (msg == NULL) {
conn->err = errno;
return NULL;
}
msg->peer = pmsg;
pmsg->peer = msg;
if (!conn->dyn_mode) {
stats_pool_incr(ctx, conn->owner, forward_error);
} else { //dyn_mode
stats_pool_incr(ctx, conn->owner, peer_forward_error);
}
} else {
msg = pmsg->peer;
}
ASSERT(!msg->request);
conn->smsg = msg;
log_debug(LOG_VVERB, "send next rsp %"PRIu64" on c %d", msg->id, conn->sd);
return msg;
}
