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use a thread per process to execute mosquitto loop, contributes to #248

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This commit is contained in:
Sonja Happ 2019-09-12 17:05:18 +02:00 • committed by Steffen Vogel
parent f3db8f6192
commit 19523377f4
1 changed files with 67 additions and 6 deletions
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73
lib/nodes/mqtt.cpp
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@ -30,6 +30,40 @@
using namespace villas::utils;
// Each process has a list of clients for which a thread invokes the mosquitto loop
static struct vlist clients;
static pthread_t thread;
static void * mosquitto_loop_thread(void *ctx)
{
int ret;
while(true){
for (unsigned i = 0; i < vlist_length(&clients); i++) {
struct node *c = (struct node *) vlist_at(&clients, i);
struct mqtt *m = (struct mqtt *) c->_vd;
// execute mosquitto loop for this client
ret = mosquitto_loop(m->client, 0, 1);
if(ret){
warning("MQTT: connection error for node %s: %s, attempting reconnect", node_name(c), mosquitto_strerror(ret));
ret = mosquitto_reconnect(m->client);
if(ret != MOSQ_ERR_SUCCESS){
error("MQTT: reconnection to broker failed for node %s: %s", node_name(c), mosquitto_strerror(ret));
}
else{
warning("MQTT: successfully reconnected to broker for node %s: %s", node_name(c), mosquitto_strerror(ret));
}
ret = mosquitto_loop(m->client, -1, 1);
if(ret != MOSQ_ERR_SUCCESS){
error("MQTT: persisting connection error for node %s: %s", node_name(c), mosquitto_strerror(ret));
}
}
} // for loop
} // while(1)
return nullptr;
}
static void mqtt_log_cb(struct mosquitto *mosq, void *userdata, int level, const char *str)
{
switch (level) {
@ -331,9 +365,9 @@ int mqtt_start(struct node *n)
if (ret)
goto mosquitto_error;
ret = mosquitto_loop_start(m->client);
if (ret)
goto mosquitto_error;
// add client to global list of MQTT clients
// so that thread can call mosquitto loop for this client
vlist_push(&clients, n);
return 0;
@ -352,9 +386,9 @@ int mqtt_stop(struct node *n)
if (ret)
goto mosquitto_error;
ret = mosquitto_loop_stop(m->client, 0);
if (ret)
goto mosquitto_error;
// unregister client from global MQTT client list
// so that mosquitto loop is no longer invoked for this client
vlist_remove_all(&clients, n);
ret = io_destroy(&m->io);
if (ret)
@ -372,10 +406,21 @@ int mqtt_type_start(villas::node::SuperNode *sn)
{
int ret;
ret = vlist_init(&clients);
if (ret) {
return ret;
}
ret = mosquitto_lib_init();
if (ret)
goto mosquitto_error;
// start thread here to run mosquitto loop for registered clients
ret = pthread_create(&thread, nullptr, mosquitto_loop_thread, nullptr);
if (ret) {
return ret;
}
return 0;
mosquitto_error:
@ -388,10 +433,26 @@ int mqtt_type_stop()
{
int ret;
// stop thread here that executes mosquitto loop
ret = pthread_cancel(thread);
if (ret)
return ret;
ret = pthread_join(thread, nullptr);
if (ret) {
return ret;
}
ret = mosquitto_lib_cleanup();
if (ret)
goto mosquitto_error;
// when this is called the list of clients should be empty
if (vlist_length(&clients) > 0) {
error("List of MQTT clients contains elements at time of destruction. Call node_stop for each MQTT node before stopping node type!");
}
vlist_destroy(&clients, nullptr, false);
return 0;
mosquitto_error: