/usr/share/proton-0.14.0/examples/c/reactor/receiver.c is in libqpid-proton8-dev-examples 0.14.0-5.1ubuntu1.
This file is owned by root:root, with mode 0o644.
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* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "pncompat/misc_funcs.inc"
#include "proton/reactor.h"
#include "proton/message.h"
#include "proton/connection.h"
#include "proton/session.h"
#include "proton/link.h"
#include "proton/delivery.h"
#include "proton/event.h"
#include "proton/handlers.h"
#include "proton/transport.h"
#include "proton/url.h"
static int quiet = 0;
// Credit batch if unlimited receive (-c 0)
static const int CAPACITY = 100;
#define MAX_SIZE 512
// Example application data. This data will be instantiated in the event
// handler, and is available during event processing. In this example it
// holds configuration and state information.
//
typedef struct {
int count; // # of messages to receive before exiting
const char *source; // name of the source node to receive from
pn_message_t *message; // holds the received message
} app_data_t;
// helper to pull pointer to app_data_t instance out of the pn_handler_t
//
#define GET_APP_DATA(handler) ((app_data_t *)pn_handler_mem(handler))
// Called when reactor exits to clean up app_data
//
static void delete_handler(pn_handler_t *handler)
{
app_data_t *d = GET_APP_DATA(handler);
if (d->message) {
pn_decref(d->message);
d->message = NULL;
}
}
/* Process each event posted by the reactor.
*/
static void event_handler(pn_handler_t *handler,
pn_event_t *event,
pn_event_type_t type)
{
app_data_t *data = GET_APP_DATA(handler);
switch (type) {
case PN_CONNECTION_INIT: {
// Create and open all the endpoints needed to send a message
//
pn_connection_t *conn;
pn_session_t *ssn;
pn_link_t *receiver;
conn = pn_event_connection(event);
pn_connection_open(conn);
ssn = pn_session(conn);
pn_session_open(ssn);
receiver = pn_receiver(ssn, "MyReceiver");
pn_terminus_set_address(pn_link_source(receiver), data->source);
pn_link_open(receiver);
// cannot receive without granting credit:
pn_link_flow(receiver, data->count ? data->count : CAPACITY);
} break;
case PN_DELIVERY: {
// A message has been received
//
pn_link_t *link = NULL;
pn_delivery_t *dlv = pn_event_delivery(event);
if (pn_delivery_readable(dlv) && !pn_delivery_partial(dlv)) {
// A full message has arrived
if (!quiet) {
static char buffer[MAX_SIZE];
ssize_t len;
pn_bytes_t bytes;
bool found = false;
// try to decode the message body
if (pn_delivery_pending(dlv) < MAX_SIZE) {
// read in the raw data
len = pn_link_recv(pn_delivery_link(dlv), buffer, MAX_SIZE);
if (len > 0) {
// decode it into a proton message
pn_message_clear(data->message);
if (PN_OK == pn_message_decode(data->message, buffer,
len)) {
// Assuming the message came from the sender
// example, try to parse out a single string from
// the payload
//
pn_data_scan(pn_message_body(data->message), "?S",
&found, &bytes);
}
}
}
if (found) {
fprintf(stdout, "Message: [%.*s]\n", (int)bytes.size,
bytes.start);
} else {
fprintf(stdout, "Message received!\n");
}
}
link = pn_delivery_link(dlv);
if (!pn_delivery_settled(dlv)) {
// remote has not settled, so it is tracking the delivery. Ack
// it.
pn_delivery_update(dlv, PN_ACCEPTED);
}
// done with the delivery, move to the next and free it
pn_link_advance(link);
pn_delivery_settle(dlv); // dlv is now freed
if (data->count == 0) {
// send forever - see if more credit is needed
if (pn_link_credit(link) < CAPACITY/2) {
// Grant enough credit to bring it up to CAPACITY:
pn_link_flow(link, CAPACITY - pn_link_credit(link));
}
} else if (--data->count == 0) {
// done receiving, close the endpoints
pn_session_t *ssn = pn_link_session(link);
pn_link_close(link);
pn_session_close(ssn);
pn_connection_close(pn_session_connection(ssn));
}
}
} break;
case PN_TRANSPORT_ERROR: {
// The connection to the peer failed.
//
pn_transport_t *tport = pn_event_transport(event);
pn_condition_t *cond = pn_transport_condition(tport);
fprintf(stderr, "Network transport failed!\n");
if (pn_condition_is_set(cond)) {
const char *name = pn_condition_get_name(cond);
const char *desc = pn_condition_get_description(cond);
fprintf(stderr, " Error: %s Description: %s\n",
(name) ? name : "<error name not provided>",
(desc) ? desc : "<no description provided>");
}
// pn_reactor_process() will exit with a false return value, stopping
// the main loop.
} break;
default:
break;
}
}
static void usage(void)
{
printf("Usage: receiver <options>\n");
printf("-a \tThe host address [localhost:5672]\n");
printf("-c \t# of messages to receive, 0=receive forever [1]\n");
printf("-s \tSource address [examples]\n");
printf("-i \tContainer name [ReceiveExample]\n");
printf("-q \tQuiet - turn off stdout\n");
exit(1);
}
int main(int argc, char** argv)
{
const char *address = "localhost";
const char *container = "ReceiveExample";
int c;
pn_reactor_t *reactor = NULL;
pn_url_t *url = NULL;
pn_connection_t *conn = NULL;
/* create a handler for the connection's events.
* event_handler will be called for each event. The handler will allocate
* a app_data_t instance which can be accessed when the event_handler is
* called.
*/
pn_handler_t *handler = pn_handler_new(event_handler,
sizeof(app_data_t),
delete_handler);
/* set up the application data with defaults */
app_data_t *app_data = GET_APP_DATA(handler);
memset(app_data, 0, sizeof(app_data_t));
app_data->count = 1;
app_data->source = "examples";
app_data->message = pn_message();
/* Attach the pn_handshaker() handler. This handler deals with endpoint
* events from the peer so we don't have to.
*/
{
pn_handler_t *handshaker = pn_handshaker();
pn_handler_add(handler, handshaker);
pn_decref(handshaker);
}
/* command line options */
opterr = 0;
while((c = getopt(argc, argv, "i:a:c:s:qh")) != -1) {
switch(c) {
case 'h': usage(); break;
case 'a': address = optarg; break;
case 'c':
app_data->count = atoi(optarg);
if (app_data->count < 0) usage();
break;
case 's': app_data->source = optarg; break;
case 'i': container = optarg; break;
case 'q': quiet = 1; break;
default:
usage();
break;
}
}
reactor = pn_reactor();
url = pn_url_parse(address);
if (url == NULL) {
fprintf(stderr, "Invalid host address %s\n", address);
exit(1);
}
conn = pn_reactor_connection_to_host(reactor,
pn_url_get_host(url),
pn_url_get_port(url),
handler);
pn_decref(url);
pn_decref(handler);
// the container name should be unique for each client
pn_connection_set_container(conn, container);
// wait up to 5 seconds for activity before returning from
// pn_reactor_process()
pn_reactor_set_timeout(reactor, 5000);
pn_reactor_start(reactor);
while (pn_reactor_process(reactor)) {
/* Returns 'true' until the connection is shut down.
* pn_reactor_process() will return true at least once every 5 seconds
* (due to the timeout). If no timeout was configured,
* pn_reactor_process() returns as soon as it finishes processing all
* pending I/O and events. Once the connection has closed,
* pn_reactor_process() will return false.
*/
}
pn_decref(reactor);
return 0;
}
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