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// SPDX-License-Identifier: GPL-3.0-or-later
#include "exporting_engine.h"
/**
* Discard response
*
* Discards a response received by an exporting connector instance after logging a sample of it to error.log
*
* @param buffer buffer with response data.
* @param instance an instance data structure.
* @return Always returns 0.
*/
int exporting_discard_response(BUFFER *buffer, struct instance *instance) {
char sample[1024];
const char *s = buffer_tostring(buffer);
char *d = sample, *e = &sample[sizeof(sample) - 1];
for(; *s && d < e ;s++) {
char c = *s;
if(unlikely(!isprint(c))) c = ' ';
*d++ = c;
}
*d = '\0';
info(
"EXPORTING: received %zu bytes from %s connector instance. Ignoring them. Sample: '%s'",
buffer_strlen(buffer),
instance->config.name,
sample);
buffer_flush(buffer);
return 0;
}
/**
* Receive response
*
* @param sock communication socket.
* @param instance an instance data structure.
*/
void simple_connector_receive_response(int *sock, struct instance *instance)
{
static BUFFER *response = NULL;
if (!response)
response = buffer_create(1);
struct stats *stats = &instance->stats;
errno = 0;
// loop through to collect all data
while (*sock != -1 && errno != EWOULDBLOCK) {
buffer_need_bytes(response, 4096);
ssize_t r;
r = recv(*sock, &response->buffer[response->len], response->size - response->len, MSG_DONTWAIT);
if (likely(r > 0)) {
// we received some data
response->len += r;
stats->chart_received_bytes += r;
stats->chart_receptions++;
} else if (r == 0) {
error("EXPORTING: '%s' closed the socket", instance->config.destination);
close(*sock);
*sock = -1;
} else {
// failed to receive data
if (errno != EAGAIN && errno != EWOULDBLOCK) {
error("EXPORTING: cannot receive data from '%s'.", instance->config.destination);
}
}
#ifdef UNIT_TESTING
break;
#endif
}
// if we received data, process them
if (buffer_strlen(response))
instance->check_response(response, instance);
}
/**
* Send buffer to a server
*
* @param sock communication socket.
* @param failures the number of communication failures.
* @param instance an instance data structure.
*/
void simple_connector_send_buffer(int *sock, int *failures, struct instance *instance)
{
BUFFER *buffer = (BUFFER *)instance->buffer;
size_t len = buffer_strlen(buffer);
int flags = 0;
#ifdef MSG_NOSIGNAL
flags += MSG_NOSIGNAL;
#endif
struct stats *stats = &instance->stats;
int ret = 0;
if (instance->send_header)
ret = instance->send_header(sock, instance);
ssize_t written = -1;
if (!ret)
written = send(*sock, buffer_tostring(buffer), len, flags);
if(written != -1 && (size_t)written == len) {
// we sent the data successfully
stats->chart_transmission_successes++;
stats->chart_sent_bytes += written;
stats->chart_sent_metrics = stats->chart_buffered_metrics;
// reset the failures count
*failures = 0;
// empty the buffer
buffer_flush(buffer);
}
else {
// oops! we couldn't send (all or some of the) data
error(
"EXPORTING: failed to write data to '%s'. Willing to write %zu bytes, wrote %zd bytes. Will re-connect.",
instance->config.destination,
len,
written);
stats->chart_transmission_failures++;
if(written != -1)
stats->chart_sent_bytes += written;
// increment the counter we check for data loss
(*failures)++;
// close the socket - we will re-open it next time
close(*sock);
*sock = -1;
}
}
/**
* Simple connector worker
*
* Runs in a separate thread for every instance.
*
* @param instance_p an instance data structure.
*/
void simple_connector_worker(void *instance_p)
{
struct instance *instance = (struct instance*)instance_p;
struct simple_connector_config *connector_specific_config = instance->config.connector_specific_config;
struct stats *stats = &instance->stats;
int sock = -1;
struct timeval timeout = {.tv_sec = (instance->config.timeoutms * 1000) / 1000000,
.tv_usec = (instance->config.timeoutms * 1000) % 1000000};
int failures = 0;
while(!netdata_exit) {
// ------------------------------------------------------------------------
// if we are connected, receive a response, without blocking
if(likely(sock != -1))
simple_connector_receive_response(&sock, instance);
// ------------------------------------------------------------------------
// if we are not connected, connect to a data collecting server
if(unlikely(sock == -1)) {
size_t reconnects = 0;
sock = connect_to_one_of(
instance->config.destination,
connector_specific_config->default_port,
&timeout,
&reconnects,
NULL,
0);
stats->chart_reconnects += reconnects;
}
if(unlikely(netdata_exit)) break;
// ------------------------------------------------------------------------
// if we are connected, send our buffer to the data collecting server
uv_mutex_lock(&instance->mutex);
uv_cond_wait(&instance->cond_var, &instance->mutex);
if (likely(sock != -1)) {
simple_connector_send_buffer(&sock, &failures, instance);
} else {
error("EXPORTING: failed to update '%s'", instance->config.destination);
stats->chart_transmission_failures++;
// increment the counter we check for data loss
failures++;
}
uv_mutex_unlock(&instance->mutex);
#ifdef UNIT_TESTING
break;
#endif
}
}
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