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-rw-r--r--exporting/send_data.c440
1 files changed, 440 insertions, 0 deletions
diff --git a/exporting/send_data.c b/exporting/send_data.c
new file mode 100644
index 0000000..1e932e9
--- /dev/null
+++ b/exporting/send_data.c
@@ -0,0 +1,440 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "exporting_engine.h"
+
+/**
+ * Check if TLS is enabled in the configuration
+ *
+ * @param type buffer with response data.
+ * @param options an instance data structure.
+ * @return Returns 1 if TLS should be enabled, 0 otherwise.
+ */
+static int exporting_tls_is_enabled(EXPORTING_CONNECTOR_TYPE type, EXPORTING_OPTIONS options)
+{
+ return (type == EXPORTING_CONNECTOR_TYPE_GRAPHITE_HTTP ||
+ type == EXPORTING_CONNECTOR_TYPE_JSON_HTTP ||
+ type == EXPORTING_CONNECTOR_TYPE_OPENTSDB_HTTP ||
+ type == EXPORTING_CONNECTOR_TYPE_PROMETHEUS_REMOTE_WRITE) &&
+ options & EXPORTING_OPTION_USE_TLS;
+}
+
+/**
+ * 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) {
+#if NETDATA_INTERNAL_CHECKS
+ 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';
+
+ debug(
+ D_BACKEND,
+ "EXPORTING: received %zu bytes from %s connector instance. Ignoring them. Sample: '%s'",
+ buffer_strlen(buffer),
+ instance->config.name,
+ sample);
+#else
+ UNUSED(instance);
+#endif /* NETDATA_INTERNAL_CHECKS */
+
+ 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(4096);
+
+ struct stats *stats = &instance->stats;
+#ifdef ENABLE_HTTPS
+ uint32_t options = (uint32_t)instance->config.options;
+ struct simple_connector_data *connector_specific_data = instance->connector_specific_data;
+
+ if (options & EXPORTING_OPTION_USE_TLS)
+ ERR_clear_error();
+#endif
+
+ errno = 0;
+
+ // loop through to collect all data
+ while (*sock != -1 && errno != EWOULDBLOCK) {
+ ssize_t r;
+#ifdef ENABLE_HTTPS
+ if (exporting_tls_is_enabled(instance->config.type, options) &&
+ connector_specific_data->conn &&
+ connector_specific_data->flags == NETDATA_SSL_HANDSHAKE_COMPLETE) {
+ r = (ssize_t)SSL_read(connector_specific_data->conn,
+ &response->buffer[response->len],
+ (int) (response->size - response->len));
+
+ if (likely(r > 0)) {
+ // we received some data
+ response->len += r;
+ stats->received_bytes += r;
+ stats->receptions++;
+ continue;
+ } else {
+ int sslerrno = SSL_get_error(connector_specific_data->conn, (int) r);
+ u_long sslerr = ERR_get_error();
+ char buf[256];
+ switch (sslerrno) {
+ case SSL_ERROR_WANT_READ:
+ case SSL_ERROR_WANT_WRITE:
+ goto endloop;
+ default:
+ ERR_error_string_n(sslerr, buf, sizeof(buf));
+ error("SSL error (%s)",
+ ERR_error_string((long)SSL_get_error(connector_specific_data->conn, (int)r), NULL));
+ goto endloop;
+ }
+ }
+ } else {
+ r = recv(*sock, &response->buffer[response->len], response->size - response->len, MSG_DONTWAIT);
+ }
+#else
+ r = recv(*sock, &response->buffer[response->len], response->size - response->len, MSG_DONTWAIT);
+#endif
+ if (likely(r > 0)) {
+ // we received some data
+ response->len += r;
+ stats->received_bytes += r;
+ stats->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
+ }
+#ifdef ENABLE_HTTPS
+endloop:
+#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 *header, BUFFER *buffer, size_t buffered_metrics)
+{
+ int flags = 0;
+#ifdef MSG_NOSIGNAL
+ flags += MSG_NOSIGNAL;
+#endif
+
+#ifdef ENABLE_HTTPS
+ uint32_t options = (uint32_t)instance->config.options;
+ struct simple_connector_data *connector_specific_data = instance->connector_specific_data;
+
+ if (options & EXPORTING_OPTION_USE_TLS)
+ ERR_clear_error();
+#endif
+
+ struct stats *stats = &instance->stats;
+ ssize_t header_sent_bytes = 0;
+ ssize_t buffer_sent_bytes = 0;
+ size_t header_len = buffer_strlen(header);
+ size_t buffer_len = buffer_strlen(buffer);
+
+#ifdef ENABLE_HTTPS
+ if (exporting_tls_is_enabled(instance->config.type, options) &&
+ connector_specific_data->conn &&
+ connector_specific_data->flags == NETDATA_SSL_HANDSHAKE_COMPLETE) {
+ if (header_len)
+ header_sent_bytes = (ssize_t)SSL_write(connector_specific_data->conn, buffer_tostring(header), header_len);
+ if ((size_t)header_sent_bytes == header_len)
+ buffer_sent_bytes = (ssize_t)SSL_write(connector_specific_data->conn, buffer_tostring(buffer), buffer_len);
+ } else {
+ if (header_len)
+ header_sent_bytes = send(*sock, buffer_tostring(header), header_len, flags);
+ if ((size_t)header_sent_bytes == header_len)
+ buffer_sent_bytes = send(*sock, buffer_tostring(buffer), buffer_len, flags);
+ }
+#else
+ if (header_len)
+ header_sent_bytes = send(*sock, buffer_tostring(header), header_len, flags);
+ if ((size_t)header_sent_bytes == header_len)
+ buffer_sent_bytes = send(*sock, buffer_tostring(buffer), buffer_len, flags);
+#endif
+
+ if ((size_t)buffer_sent_bytes == buffer_len) {
+ // we sent the data successfully
+ stats->transmission_successes++;
+ stats->sent_metrics += buffered_metrics;
+ stats->sent_bytes += buffer_sent_bytes;
+
+ // 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,
+ buffer_len,
+ buffer_sent_bytes);
+ stats->transmission_failures++;
+
+ if(buffer_sent_bytes != -1)
+ stats->sent_bytes += buffer_sent_bytes;
+
+ // 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_data *connector_specific_data = instance->connector_specific_data;
+
+#ifdef ENABLE_HTTPS
+ uint32_t options = (uint32_t)instance->config.options;
+
+ if (options & EXPORTING_OPTION_USE_TLS)
+ ERR_clear_error();
+#endif
+ struct simple_connector_config *connector_specific_config = instance->config.connector_specific_config;
+
+ int sock = -1;
+ struct timeval timeout = { .tv_sec = (instance->config.timeoutms * 1000) / 1000000,
+ .tv_usec = (instance->config.timeoutms * 1000) % 1000000 };
+ int failures = 0;
+
+ while (!instance->engine->exit) {
+ struct stats *stats = &instance->stats;
+ int send_stats = 0;
+
+ if (instance->data_is_ready)
+ send_stats = 1;
+
+ uv_mutex_lock(&instance->mutex);
+ if (!connector_specific_data->first_buffer->used || failures) {
+ while (!instance->data_is_ready)
+ uv_cond_wait(&instance->cond_var, &instance->mutex);
+ instance->data_is_ready = 0;
+ send_stats = 1;
+ }
+
+ if (unlikely(instance->engine->exit)) {
+ uv_mutex_unlock(&instance->mutex);
+ break;
+ }
+
+ // ------------------------------------------------------------------------
+ // detach buffer
+
+ size_t buffered_metrics;
+
+ if (!connector_specific_data->previous_buffer ||
+ (connector_specific_data->previous_buffer == connector_specific_data->first_buffer &&
+ connector_specific_data->first_buffer->used == 1)) {
+ BUFFER *header, *buffer;
+
+ header = connector_specific_data->first_buffer->header;
+ buffer = connector_specific_data->first_buffer->buffer;
+ connector_specific_data->buffered_metrics = connector_specific_data->first_buffer->buffered_metrics;
+ connector_specific_data->buffered_bytes = connector_specific_data->first_buffer->buffered_bytes;
+
+ buffered_metrics = connector_specific_data->buffered_metrics;
+
+ buffer_flush(connector_specific_data->header);
+ connector_specific_data->first_buffer->header = connector_specific_data->header;
+ connector_specific_data->header = header;
+
+ buffer_flush(connector_specific_data->buffer);
+ connector_specific_data->first_buffer->buffer = connector_specific_data->buffer;
+ connector_specific_data->buffer = buffer;
+ } else {
+ buffered_metrics = connector_specific_data->buffered_metrics;
+ }
+
+ uv_mutex_unlock(&instance->mutex);
+
+ // ------------------------------------------------------------------------
+ // 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);
+#ifdef ENABLE_HTTPS
+ if (exporting_tls_is_enabled(instance->config.type, options) && sock != -1) {
+ if (netdata_exporting_ctx) {
+ if (sock_delnonblock(sock) < 0)
+ error("Exporting cannot remove the non-blocking flag from socket %d", sock);
+
+ if (connector_specific_data->conn == NULL) {
+ connector_specific_data->conn = SSL_new(netdata_exporting_ctx);
+ if (connector_specific_data->conn == NULL) {
+ error("Failed to allocate SSL structure to socket %d.", sock);
+ connector_specific_data->flags = NETDATA_SSL_NO_HANDSHAKE;
+ }
+ } else {
+ SSL_clear(connector_specific_data->conn);
+ }
+
+ if (connector_specific_data->conn) {
+ if (SSL_set_fd(connector_specific_data->conn, sock) != 1) {
+ error("Failed to set the socket to the SSL on socket fd %d.", sock);
+ connector_specific_data->flags = NETDATA_SSL_NO_HANDSHAKE;
+ } else {
+ connector_specific_data->flags = NETDATA_SSL_HANDSHAKE_COMPLETE;
+ SSL_set_connect_state(connector_specific_data->conn);
+ int err = SSL_connect(connector_specific_data->conn);
+ if (err != 1) {
+ err = SSL_get_error(connector_specific_data->conn, err);
+ error(
+ "SSL cannot connect with the server: %s ",
+ ERR_error_string((long)SSL_get_error(connector_specific_data->conn, err), NULL));
+ connector_specific_data->flags = NETDATA_SSL_NO_HANDSHAKE;
+ } else {
+ info("Exporting established a SSL connection.");
+
+ struct timeval tv;
+ tv.tv_sec = timeout.tv_sec / 4;
+ tv.tv_usec = 0;
+
+ if (!tv.tv_sec)
+ tv.tv_sec = 2;
+
+ if (setsockopt(sock, SOL_SOCKET, SO_RCVTIMEO, (const char *)&tv, sizeof(tv)))
+ error("Cannot set timeout to socket %d, this can block communication", sock);
+ }
+ }
+ }
+ }
+ }
+#endif
+
+ stats->reconnects += reconnects;
+ }
+
+ if (unlikely(instance->engine->exit))
+ break;
+
+ // ------------------------------------------------------------------------
+ // if we are connected, send our buffer to the data collecting server
+
+ failures = 0;
+
+ if (likely(sock != -1)) {
+ simple_connector_send_buffer(
+ &sock,
+ &failures,
+ instance,
+ connector_specific_data->header,
+ connector_specific_data->buffer,
+ buffered_metrics);
+ } else {
+ error("EXPORTING: failed to update '%s'", instance->config.destination);
+ stats->transmission_failures++;
+
+ // increment the counter we check for data loss
+ failures++;
+ }
+
+ if (!failures) {
+ connector_specific_data->first_buffer->buffered_metrics =
+ connector_specific_data->first_buffer->buffered_bytes = connector_specific_data->first_buffer->used = 0;
+ connector_specific_data->first_buffer = connector_specific_data->first_buffer->next;
+ }
+
+ if (unlikely(instance->engine->exit))
+ break;
+
+ if (send_stats) {
+ uv_mutex_lock(&instance->mutex);
+
+ stats->buffered_metrics = connector_specific_data->total_buffered_metrics;
+
+ send_internal_metrics(instance);
+
+ stats->buffered_metrics = 0;
+
+ // reset the internal monitoring chart counters
+ connector_specific_data->total_buffered_metrics =
+ stats->buffered_bytes =
+ stats->receptions =
+ stats->received_bytes =
+ stats->sent_metrics =
+ stats->sent_bytes =
+ stats->transmission_successes =
+ stats->transmission_failures =
+ stats->reconnects =
+ stats->data_lost_events =
+ stats->lost_metrics =
+ stats->lost_bytes = 0;
+
+ uv_mutex_unlock(&instance->mutex);
+ }
+
+#ifdef UNIT_TESTING
+ return;
+#endif
+ }
+
+#if ENABLE_PROMETHEUS_REMOTE_WRITE
+ if (instance->config.type == EXPORTING_CONNECTOR_TYPE_PROMETHEUS_REMOTE_WRITE)
+ clean_prometheus_remote_write(instance);
+#endif
+
+ simple_connector_cleanup(instance);
+}