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authorZhijiang Hu <hu.zhijiang@zte.com.cn>2017-04-06 23:21:42 -0400
committerZhijiang Hu <hu.zhijiang@zte.com.cn>2017-04-07 03:52:25 -0400
commit7c577e23dde00c759db0cca0898809c3d278b37a (patch)
tree7f8942a599a9b4dbf19f12c8179ded86834cdaa9 /code/jasmine/server-tcp.c
parentd24bd81e5689c5d8531581fb8e3604d6851cc094 (diff)
jasmine(Just A Simple Multicast engINE) Initial mergev1.0.2
Change-Id: I7a543019c8d92314ef549bf72369b7276f39577d Signed-off-by: Zhijiang Hu <hu.zhijiang@zte.com.cn>
Diffstat (limited to 'code/jasmine/server-tcp.c')
-rwxr-xr-xcode/jasmine/server-tcp.c550
1 files changed, 550 insertions, 0 deletions
diff --git a/code/jasmine/server-tcp.c b/code/jasmine/server-tcp.c
new file mode 100755
index 00000000..c48de77d
--- /dev/null
+++ b/code/jasmine/server-tcp.c
@@ -0,0 +1,550 @@
+/*##############################################################################
+# Copyright (c) 2017 ZTE Coreporation and others.
+# hu.zhijiang@zte.com.cn
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################*/
+
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <sys/poll.h>
+#include <string.h>
+#include <pthread.h>
+
+#include "buffer.h"
+#include "tcp-common.h"
+#include "udp-common.h"
+#include "tcp-queue.h"
+#include "misc.h"
+#include "server.h"
+
+#define MAX_CLIENTS 128 /* Clients per TCP server */
+#define TCP_BUFF_SIZE 65536
+
+struct cdata {
+ struct tcpq *tx;
+ struct tcpq *rx;
+ int await; /* non-zero if we are in the middle of receiving clients requests */
+ struct sockaddr_in peer;
+};
+
+struct server_status_data {
+ int state; /* state machine */
+ int sync_count;
+ int ccount;
+ struct semlink sl;
+ pthread_t pchild;
+
+ struct pollfd ds[MAX_CLIENTS + 1];
+ struct cdata cd[MAX_CLIENTS + 1];
+ int cindex;
+ int last_buff_pkt_count;
+};
+
+void init_sdata(struct server_status_data *sdata, void *thread_args)
+{
+ int i;
+
+ sdata->sl.parent = (struct semaphores *)thread_args;
+ sdata->sl.this = NULL;
+
+ sdata->state = S_PREP;
+ sdata->last_buff_pkt_count = 1;
+ sdata->sync_count = 0;
+
+ for (i = 0; i < MAX_CLIENTS + 1; i++) {
+ sdata->ds[i].fd = -1;
+ sdata->ds[i].events = POLLIN;
+ sdata->cd[i].tx = tcpq_queue_init();
+ sdata->cd[i].rx = tcpq_queue_init();
+ sdata->cd[i].await = 0;
+ }
+}
+
+/* disconnect one client and compress table */
+void kill_client(struct server_status_data *sdata)
+{
+ struct pollfd *ds = sdata->ds;
+ struct cdata *cd = sdata->cd;
+
+ close((ds + sdata->cindex)->fd);
+ tcpq_queue_free((cd + sdata->cindex)->rx);
+ tcpq_queue_free((cd + sdata->cindex)->tx);
+
+ /* Move last slot to this free slot and release the last slot */
+ *(ds + sdata->cindex) = *(ds + sdata->ccount - 1);
+ *(cd + sdata->cindex) = *(cd + sdata->ccount - 1);
+ sdata->cindex--;
+ sdata->ccount--;
+ client_count--;
+}
+
+void send_buffctl_to_all_clients(struct server_status_data *sdata)
+{
+ int i;
+ long send_sz;
+ void *cpy;
+
+ /* copy header to all queues */
+ send_sz = sizeof(struct buffer_ctl);
+ for (i = 1; i < sdata->ccount; i++) {
+ cpy = wrapper_malloc(send_sz);
+ memcpy(cpy, &buffctl, send_sz);
+ tcpq_queue_tail(sdata->cd[i].tx, cpy, send_sz);
+ sdata->ds[i].events |= POLLOUT;
+ }
+}
+
+void send_sent_to_all_clients(struct server_status_data *sdata)
+{
+ int i;
+ void *cpy;
+ uint8_t byte = SERVER_SENT;
+
+ /* Push data to clients */
+ for (i = 1; i < sdata->ccount; i++) {
+ cpy = wrapper_malloc(1);
+ memcpy(cpy, &byte, 1);
+ tcpq_queue_tail(sdata->cd[i].tx, cpy, 1);
+ sdata->ds[i].events |= POLLOUT;
+ }
+}
+void accept_clients(struct server_status_data *sdata)
+{
+ int res;
+ int new_fd;
+ socklen_t socklen;
+ int poll_events;
+ int timeout = -1;
+ struct pollfd *ds = sdata->ds;
+ struct cdata *cd = sdata->cd;
+
+ ds->events = POLLIN;
+ ds->revents = 0;
+ sdata->ccount = 1;
+
+ while (sdata->ccount <= MAX_CLIENTS && client_count < wait_count) {
+ poll_events = poll(ds, 1, timeout);
+ if (poll_events < 0) {
+ crit("poll() failed");
+ } else if (poll_events == 0) {
+ log(2, "poll() returned with no results!");
+ continue;
+ }
+
+ log(9, "poll: %d events", poll_events);
+
+ if (ds->revents) {
+
+ /* new connections come in */
+ if (ds->revents & (POLLIN|POLLPRI)) {
+
+ do {
+ socklen = sizeof((cd + sdata->ccount)->peer);
+retry_accept:
+ new_fd = accept(ds->fd,
+ (struct sockaddr *)&((cd + sdata->ccount)->peer),
+ &socklen);
+ if (new_fd == -1 && errno == EINTR) {
+ goto retry_accept;
+ }
+
+ if (new_fd == -1) {
+ log(2, "accept() returned with error %d", errno);
+ break;
+ }
+
+ /* Send group info, before set non block */
+ res = write(new_fd, &mcinfo, sizeof(struct mc_info));
+ if (res < 0) {
+ log(3, "Error opening connection: %s",
+ inet_ntoa((cd + sdata->ccount)->peer.sin_addr));
+ close(new_fd);
+ continue;
+ }
+
+ /* Can set to non block becasue we will poll it in future. */
+ res = fcntl(new_fd, F_SETFL, O_NONBLOCK);
+ if (res == -1) {
+ log(2, "fcntl() returned with error %d", errno);
+ close(new_fd);
+ continue;
+ }
+
+ (ds + sdata->ccount)->fd = new_fd;
+
+ log(5, "New connection %d: %s",
+ sdata->ccount, inet_ntoa((cd + sdata->ccount)->peer.sin_addr));
+ sdata->ccount++;
+ client_count++;
+ } while (sdata->ccount <= MAX_CLIENTS);
+
+ } else {
+ log(2, "Error on tcp socket");
+ }
+
+ poll_events--;
+ ds->revents = 0;
+ }
+ }
+
+ ds->events = 0;
+}
+
+void accept_clients_may_spawn(struct server_status_data *sdata)
+{
+ /* Wait the parent to let us accpet clients */
+ sl_wait_parent(&(sdata->sl));
+
+ sdata->ds[0].fd = sfd;
+ accept_clients(sdata);
+ if (client_count < wait_count) {
+ sdata->sl.this = spawn_thread(&sdata->pchild, tcp_server_main, 1);
+
+ /* Let child TCP servers accept connections */
+ sl_release_child(&(sdata->sl));
+ /* Wait until all childern TCP servers got all their clients */
+ sl_wait_child(&(sdata->sl));
+ }
+
+ /* Tell parent all client are accepted/connected */
+ sl_release_parent(&(sdata->sl));
+}
+
+void keep_on_receiving_client_request(struct server_status_data *sdata)
+{
+ char buf[TCP_BUFF_SIZE];
+ void *cpy;
+ struct request_ctl *req;
+ uint32_t *rqb;
+ struct packet_ctl *ans;
+ long rq_index;
+ long total_sz;
+
+ long read_out;
+ struct pollfd *ds;
+ struct cdata *cd;
+
+ ds = &(sdata->ds[sdata->cindex]);
+ cd = &(sdata->cd[sdata->cindex]);
+
+ read_out = read(ds->fd, buf, cd->await);
+ if (read_out <= 0) {
+ log(5, "Client disconnected (r): %s",
+ inet_ntoa(cd->peer.sin_addr));
+ kill_client(sdata);
+ return;
+ }
+
+ log(7, "New data (%ld + %ld) on conn %d: %s",
+ read_out, tcpq_queue_dsize(cd->rx), sdata->cindex,
+ inet_ntoa(cd->peer.sin_addr));
+ cpy = wrapper_malloc(read_out);
+ memcpy(cpy, buf, read_out);
+ tcpq_queue_tail(cd->rx, cpy, read_out);
+ cd->await -= read_out;
+
+ /* Full header received */
+ if (tcpq_queue_dsize(cd->rx) == sizeof(struct request_ctl)) {
+ cpy = tcpq_queue_flat_peek(cd->rx, &read_out);
+ req = (struct request_ctl *)cpy;
+ cd->await = req->req_count * sizeof(uint32_t);
+ log(6, "Client request for %u packets on %d: %s",
+ req->req_count, sdata->cindex, inet_ntoa(cd->peer.sin_addr));
+ /* req->rqc may be zero? So do not return from here */
+ }
+
+ /* Whole request(struct request_ctl + all rq blocks) received */
+ if (cd->await == 0) {
+ cpy = tcpq_dqueue_flat(cd->rx, &read_out);
+ req = (struct request_ctl *)cpy;
+ rqb = (uint32_t *) (cpy + sizeof(struct request_ctl));
+ for (rq_index = 0; rq_index < req->req_count; rq_index++) {
+ ans = packet_get(*(rqb + rq_index));
+ total_sz = ans->data_size + sizeof(struct packet_ctl);
+ log(6, "Send packet %u (%u bytes) on %d",
+ rqb[rq_index], ans->data_size, sdata->cindex);
+ cpy = wrapper_malloc(total_sz);
+ memcpy(cpy, ans, total_sz);
+ tcpq_queue_tail(cd->tx, cpy, total_sz);
+ }
+
+ if (rq_index > 0) {
+ /* Data need to be sent out */
+ ds->events |= POLLOUT;
+ }
+ }
+}
+
+void handle_error_event(struct server_status_data *sdata)
+{
+ struct cdata *cd;
+
+ cd = &(sdata->cd[sdata->cindex]);
+ log(5, "Closing connection %d: %s",
+ sdata->cindex, inet_ntoa(cd->peer.sin_addr));
+ kill_client(sdata);
+}
+
+void handle_client_ready(struct server_status_data *sdata)
+{
+ if (sdata->state == S_SYNC) {
+ sdata->sync_count++;
+
+ log(7, "Client SYNC %d of %d",
+ sdata->sync_count, sdata->ccount - 1);
+
+ if (sdata->sync_count == sdata->ccount - 1) {
+ /* All client SYNC done */
+ sdata->state = S_SEND;
+
+ /* Wait child ready */
+ sl_wait_child(&(sdata->sl));
+ /* Tell parent I am ready, release parent */
+ sl_release_parent(&(sdata->sl));
+
+ /* Wait parent to send mcast */
+ sl_wait_parent(&(sdata->sl));
+ /* tell child mcast done, release child */
+ sl_release_child(&(sdata->sl));
+
+ send_sent_to_all_clients(sdata);
+ }
+ }
+}
+
+void handle_client_done(struct server_status_data *sdata)
+{
+ if (sdata->state == S_SEND) {
+ log(7, "Client START %d of %d",
+ sdata->sync_count, sdata->ccount - 1);
+
+ sdata->sync_count--;
+ if (sdata->sync_count == 0) {
+ /* Got all client START */
+ sdata->state = S_PREP;
+ log(7, "All received, now tell UDP Server prepare next buffer");
+ /* Remeber old buffctl.pkt_count before it change */
+ sdata->last_buff_pkt_count = buffctl.pkt_count;
+
+ /* Wait child clients done */
+ sl_wait_child(&(sdata->sl));
+ /* Tell parent all our clients are done, release parent */
+ sl_release_parent(&(sdata->sl));
+ }
+ }
+}
+
+void handle_client_events(struct server_status_data *sdata)
+{
+ struct pollfd *ds;
+ struct cdata *cd;
+ int read_out;
+ uint8_t msgtype;
+
+ ds = &(sdata->ds[sdata->cindex]);
+ cd = &(sdata->cd[sdata->cindex]);
+
+ /* read message type */
+ read_out = read(ds->fd, &msgtype, 1);
+ if (read_out <= 0) {
+ log(5, "Client disconnected due to read error %d, ret:%d (r): %s",
+ errno, read_out, inet_ntoa(cd->peer.sin_addr));
+ kill_client(sdata);
+ return; /* continue to check other clients */
+ }
+
+ switch (msgtype) {
+ case CLIENT_READY:
+ handle_client_ready(sdata);
+ break;
+ case CLIENT_DONE:
+ handle_client_done(sdata);
+ break;
+ case CLIENT_REQ:
+ /* wait a whole struct request_ctl */
+ cd->await = sizeof(struct request_ctl);
+ break;
+ default:
+ log(4, "Wrong message type from %s",
+ inet_ntoa(cd->peer.sin_addr));
+ break;
+ }
+}
+
+void handle_pullin_event(struct server_status_data *sdata)
+{
+ struct cdata *cd;
+
+ cd = &(sdata->cd[sdata->cindex]);
+
+ /* Await is set only for repeat request */
+ if (cd->await) {
+ keep_on_receiving_client_request(sdata);
+ } else {
+ handle_client_events(sdata);
+ }
+}
+
+void handle_pullout_event(struct server_status_data *sdata)
+{
+ char buf[TCP_BUFF_SIZE];
+ struct pollfd *ds;
+ struct cdata *cd;
+ long transmit_sz;
+ void *cpy;
+ long written_in;
+
+ ds = &(sdata->ds[sdata->cindex]);
+ cd = &(sdata->cd[sdata->cindex]);
+
+ if (cd->tx->count == 0) {
+ ds->events = POLLIN; /* Just make sure */
+ return;
+ }
+
+ log(7, "handle_pullout_event servs No.%d conn", sdata->cindex);
+
+ /* If there is some data to be sent, try to do it now */
+ cpy = tcpq_dequeue_head(cd->tx, &transmit_sz);
+ memcpy(buf, cpy, transmit_sz);
+ free(cpy);
+
+ written_in = write(ds->fd, buf, transmit_sz);
+ if (written_in <= 0) {
+ log(5, "Client disconnected (w): %s",
+ inet_ntoa(cd->peer.sin_addr));
+ kill_client(sdata);
+ return;
+ }
+
+ if (written_in != transmit_sz) {
+ log(6, "Partial wrote: %ld out of %ld bytes sent",
+ written_in, transmit_sz);
+ cpy = wrapper_malloc(transmit_sz - written_in);
+ memcpy(cpy, buf + written_in, transmit_sz - written_in);
+ tcpq_queue_head(cd->tx, cpy, transmit_sz - written_in);
+ } else {
+ log(7, "Sent %ld bytes to %s",
+ written_in, inet_ntoa(cd->peer.sin_addr));
+ if (cd->tx->count == 0) {
+ /* Do not listen pollout event anymore */
+ ds->events = POLLIN;
+ }
+ }
+}
+
+void check_clients(struct server_status_data *sdata)
+{
+ int poll_events;
+ struct pollfd *ds;
+ int timeout = -1;
+
+ if (sdata->ccount == 1) {
+ log(5, "No more clients, start exiting. s,c,p:%d,%d,%d",
+ sdata->state, sdata->ccount, buffctl.pkt_count);
+ /* No client existed */
+ switch(sdata->state) {
+ case S_SYNC:
+ /* Wait all children ready */
+ sl_wait_child(&(sdata->sl));
+ /* Tell parent I am ready, release parent */
+ sl_release_parent(&(sdata->sl));
+
+ /* Wait parent to send mcast */
+ sl_wait_parent(&(sdata->sl));
+ /* Tell child mcast done, release child */
+ sl_release_child(&(sdata->sl));
+ case S_SEND:
+ sdata->state = S_PREP;
+ /* Remeber old buffctl.pkt_count before it change */
+ sdata->last_buff_pkt_count = buffctl.pkt_count;
+
+ /* Wait child clients done */
+ sl_wait_child(&(sdata->sl));
+ /* Tell parent all our clients are done */
+ sl_release_parent(&(sdata->sl));
+ }
+ /* return to main loop to finish the dummy run */
+ return;
+ }
+
+ /* poll clients only */
+ poll_events = poll(&(sdata->ds[1]), sdata->ccount - 1, timeout);
+ if (poll_events < 0) {
+ crit("poll() failed");
+ } else if (poll_events == 0) {
+ log(2, "poll() returned with no results!");
+ return;
+ }
+
+ log(9, "poll clients: %d events", poll_events);
+
+ /* check all connected clients */
+ for (sdata->cindex = 1; sdata->cindex < sdata->ccount; sdata->cindex++) {
+ ds = &(sdata->ds[sdata->cindex]);
+ if (!ds->revents) {
+ continue;
+ }
+
+ if (ds->revents & (POLLERR|POLLHUP|POLLNVAL)) {
+ handle_error_event(sdata);
+ } else if (ds->revents & (POLLIN|POLLPRI)) {
+ handle_pullin_event(sdata);
+ } else if (ds->revents & POLLOUT) {
+ handle_pullout_event(sdata);
+ }
+ }
+}
+
+void * tcp_server_main(void *args)
+{
+ int i;
+ struct server_status_data ssdata;
+ struct server_status_data *sdata;
+
+ sdata = &ssdata;
+ init_sdata(sdata, args);
+
+ accept_clients_may_spawn(sdata);
+
+ while (1) {
+ if (sdata->state == S_PREP) {
+ /* Wait UDP server to prepare the buffctl of this round to send */
+ sl_wait_parent(&(sdata->sl));
+ log(6, "After waiting UDP server preparation. s,c,p:%d,%d,%d",
+ sdata->state, sdata->ccount - 1, buffctl.pkt_count);
+ /* Tell children buffer pareparation done, release child */
+ sl_release_child(&(sdata->sl));
+ send_buffctl_to_all_clients(sdata);
+ sdata->state = S_SYNC;
+ }
+
+ check_clients(sdata);
+
+ if (sdata->state == S_PREP && sdata->last_buff_pkt_count == 0) {
+ log(5, "No more output, TCP server finished");
+ if (sdata->sl.this && pthread_join(sdata->pchild, 0) < 0) {
+ crit("pthread_join()");
+ }
+
+ /* shutdown conn to clients */
+ for (i = sdata->ccount - 1; i > 0; i--) {
+ shutdown((sdata->ds[i]).fd, 2);
+ }
+
+ if (!sdata->sl.this) {
+ /* leaf server */
+ close(sfd);
+ sfd = -1;
+ }
+ return 0;
+ }
+ }
+}