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| /* server.c - see http://ultramessaging.github.io/UMExamples/server/c/index.html
*
* Copyright (c) 2005-2017 Informatica Corporation. All Rights Reserved.
* Permission is granted to licensees to use
* or alter this software for any purpose, including commercial applications,
* according to the terms laid out in the Software License Agreement.
*
* This source code example is provided by Informatica for educational
* and evaluation purposes only.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INFORMATICA DISCLAIMS ALL WARRANTIES
* EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION, ANY IMPLIED WARRANTIES OF
* NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR
* PURPOSE. INFORMATICA DOES NOT WARRANT THAT USE OF THE SOFTWARE WILL BE
* UNINTERRUPTED OR ERROR-FREE. INFORMATICA SHALL NOT, UNDER ANY CIRCUMSTANCES, BE
* LIABLE TO LICENSEE FOR LOST PROFITS, CONSEQUENTIAL, INCIDENTAL, SPECIAL OR
* INDIRECT DAMAGES ARISING OUT OF OR RELATED TO THIS AGREEMENT OR THE
* TRANSACTIONS CONTEMPLATED HEREUNDER, EVEN IF INFORMATICA HAS BEEN APPRISED OF
* THE LIKELIHOOD OF SUCH DAMAGES.
*/
#include <stdio.h>
#include <string.h>
#if defined(_MSC_VER)
/* Windows-only includes */
#include <winsock2.h>
#define SLEEP(s) Sleep((s)*1000)
#else
/* Unix-only includes */
#include <stdlib.h>
#include <unistd.h>
#define SLEEP(s) sleep(s)
#endif
#include <lbm/lbm.h>
/* Header for request messages. */
typedef struct req_hdr_s {
char data[8];
} req_hdr_t;
#define MAX_RESP_SIZE 7000
typedef struct client_s {
int state; /* 0=waiting for registration, 1=registered. */
char *topic_name;
char *source_name;
lbm_context_t *ctx;
lbm_src_t *resp_src;
char send_buf[MAX_RESP_SIZE + sizeof(req_hdr_t)];
} client_t;
/* Example error checking macro. Include after each UM call. */
#define EX_LBM_CHK(err) do { \
if ((err) < 0) { \
fprintf(stderr, "%s:%d, lbm error: '%s'\n", \
__FILE__, __LINE__, lbm_errmsg()); \
exit(1); \
} \
} while (0)
/* Error if null. */
#define NULL_CHK(N_ptr) do { \
if ((N_ptr) == NULL) { \
fprintf(stderr, "Error, %s:%d: '%s' is NULL\n", \
__FILE__, __LINE__, #N_ptr); \
fflush(stderr); \
abort(); /* core dump */ \
} \
} while (0)
void handle_register(client_t *client, const char *client_resp_name)
{
int err;
/* This work should probably be passed to a separate worker thread, but
* I'll do it here to simplify the code. */
if (client->state == 1) {
printf("Source '%s' re-confirmed\n", client->topic_name);
/* Reply to client. */
err = lbm_src_send(client->resp_src, "rOK", 4, LBM_MSG_FLUSH | LBM_SRC_NONBLOCK);
EX_LBM_CHK(err);
}
else if (client->state == 0) {
lbm_src_topic_attr_t * src_attr;
lbm_topic_t *lbm_topic;
/* Create source to send responses to client. */
err = lbm_src_topic_attr_create(&src_attr);
EX_LBM_CHK(err);
err = lbm_src_topic_attr_str_setopt(src_attr, "transport", "lbt-ru");
EX_LBM_CHK(err);
err = lbm_src_topic_attr_str_setopt(src_attr, "transport_lbtru_port", "12070");
EX_LBM_CHK(err);
err = lbm_src_topic_attr_str_setopt(src_attr,
"transport_source_side_filtering_behavior", "inclusion");
EX_LBM_CHK(err);
err = lbm_src_topic_alloc(&lbm_topic, client->ctx, client_resp_name, src_attr);
EX_LBM_CHK(err);
/* The following create can fail if a new client joins with the same
* response topic name as an existing client. Should handle this cleanly. */
err = lbm_src_create(&client->resp_src, client->ctx, lbm_topic,
NULL, NULL, NULL);
if (err) {
printf("Source '%s' failed; %s\n", client_resp_name, lbm_errmsg());
}
else {
client->state = 1;
client->topic_name = strdup(client_resp_name);
NULL_CHK(client->topic_name);
printf("Source '%s' created\n", client->topic_name);
}
err = lbm_src_topic_attr_delete(src_attr);
EX_LBM_CHK(err);
}
} /* handle_register */
void handle_req(client_t *client, req_hdr_t *req_hdr, const char *req_msg, size_t len)
{
int err;
/* This work should probably be passed to a separate worker thread, but
* I'll do it here to simplify the code. */
/* Responses copy the header from the request. */
memcpy(&client->send_buf[0], (char *)req_hdr, sizeof(req_hdr_t));
/* Response message is put after the header. */
char *response_msg = &client->send_buf[sizeof(req_hdr_t)];
/* Do the work of the request and put the response in response_msg.
* (For this sample, just echo back the request.) */
strcpy(response_msg, req_msg);
/* Reply to client. */
err = lbm_src_send(client->resp_src, client->send_buf,
strlen(client->send_buf) + 1, LBM_MSG_FLUSH | LBM_SRC_NONBLOCK);
EX_LBM_CHK(err);
printf("sent response to '%s'.\n", client->topic_name);
} /* handle_req */
int request_rcv_cb(lbm_rcv_t *rcv, lbm_msg_t *msg, void *clientd)
{
client_t *client = (client_t *)msg->source_clientd;
switch (msg->type)
{
case LBM_MSG_DATA: /* Received a message from the client. */
printf("Received %ld bytes on topic %s: '%.*s'\n",
(long)msg->len, msg->topic_name, (int)msg->len, msg->data);
/* Register message. */
if (msg->len > 1 && msg->data[0] == 'r') {
handle_register(client, &msg->data[1]);
}
/* Request message. */
else if (msg->len >= sizeof(req_hdr_t) && msg->data[0] == 'R') {
req_hdr_t req_hdr;
memcpy((char *)&req_hdr, msg->data, sizeof(req_hdr_t));
handle_req(client, &req_hdr, &msg->data[sizeof(req_hdr_t)],
msg->len - sizeof(req_hdr_t));
}
else {
printf("Ignored unrecognized command '%c'\n", msg->data[0]);
break;
}
break;
case LBM_MSG_BOS:
printf("[%s][%s], BOS\n", msg->topic_name, msg->source);
break;
case LBM_MSG_EOS:
printf("[%s][%s], EOS\n", msg->topic_name, msg->source);
break;
default: /* unexpected receiver event */
printf("Receive event type %x topic='%s', source='%s'\n", msg->type, msg->topic_name, msg->source);
break;
} /* switch msg->type */
return 0;
} /* request_rcv_cb */
void *start_client_source(const char *source_name, void *clientd)
{
lbm_context_t *ctx = (lbm_context_t *)clientd;;
client_t *new_client = (client_t *)malloc(sizeof(client_t));
NULL_CHK(new_client);
new_client->state = 0; /* Waiting for register. */
new_client->topic_name = NULL;
new_client->source_name = strdup(source_name);
NULL_CHK(new_client->source_name);
new_client->ctx = ctx;
new_client->resp_src = NULL;
return new_client;
} /* start_client_source */
int end_client_source(const char *source_name, void *clientd, void *source_clientd)
{
int err;
if (source_clientd) {
client_t *client = (client_t *)source_clientd;
if (client->topic_name) {
free(client->topic_name);
}
if (client->source_name) {
free(client->source_name);
}
err = lbm_src_delete(client->resp_src);
EX_LBM_CHK(err);
free(source_clientd);
}
return 0;
} /* end_client_source */
int main(int argc, char **argv)
{
lbm_context_t *ctx;
lbm_rcv_t *rcv; /* Receiver for requests from clients. */
int err;
#if defined(_MSC_VER)
/* windows-specific code */
WSADATA wsadata;
int wsStat = WSAStartup(MAKEWORD(2,2), &wsadata);
if (wsStat != 0) {
printf("line %d: wsStat=%d\n",__LINE__,wsStat); exit(1);
}
#endif
err = lbm_config("serv.cfg");
EX_LBM_CHK(err);
err = lbm_context_create(&ctx, NULL, NULL, NULL);
EX_LBM_CHK(err);
/* Create receiver for requests from clients. */
{
lbm_rcv_src_notification_func_t source_notification_function;
lbm_rcv_topic_attr_t *rcv_attr;
lbm_topic_t *topic;
err = lbm_rcv_topic_attr_create(&rcv_attr);
EX_LBM_CHK(err);
/* Set up per-source state management. */
source_notification_function.create_func = start_client_source;
source_notification_function.delete_func = end_client_source;
source_notification_function.clientd = ctx; /* Pass this to start_client_source(). */
err = lbm_rcv_topic_attr_setopt(rcv_attr, "source_notification_function",
&source_notification_function, sizeof(source_notification_function));
EX_LBM_CHK(err);
err = lbm_rcv_topic_lookup(&topic, ctx, "Server1.Request", rcv_attr);
EX_LBM_CHK(err);
/* Pass context object as clientd. */
err = lbm_rcv_create(&rcv, ctx, topic, request_rcv_cb, ctx, NULL);
EX_LBM_CHK(err);
err = lbm_rcv_topic_attr_delete(rcv_attr);
EX_LBM_CHK(err);
}
while (1) {
SLEEP(1);
}
/* Finished all receiving from this topic, delete the receiver object. */
err = lbm_rcv_delete(rcv);
EX_LBM_CHK(err);
/* Do not need to delete the topic object - LBM keeps track of topic
* objects and deletes them as-needed. */
/* Finished with all LBM functions, delete the context object. */
err = lbm_context_delete(ctx);
EX_LBM_CHK(err);
#if defined(_MSC_VER)
WSACleanup();
#endif
return 0;
} /* main */
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