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netdata/streaming/sender.c

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// SPDX-License-Identifier: GPL-3.0-or-later
#include "rrdpush.h"
#define WORKER_SENDER_JOB_CONNECT 0
#define WORKER_SENDER_JOB_PIPE_READ 1
#define WORKER_SENDER_JOB_SOCKET_RECEIVE 2
#define WORKER_SENDER_JOB_EXECUTE 3
#define WORKER_SENDER_JOB_SOCKET_SEND 4
#define WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE 5
#define WORKER_SENDER_JOB_DISCONNECT_OVERFLOW 6
#define WORKER_SENDER_JOB_DISCONNECT_TIMEOUT 7
#define WORKER_SENDER_JOB_DISCONNECT_POLL_ERROR 8
#define WORKER_SENDER_JOB_DISCONNECT_SOCKER_ERROR 9
#define WORKER_SENDER_JOB_DISCONNECT_SSL_ERROR 10
#define WORKER_SENDER_JOB_DISCONNECT_PARENT_CLOSED 11
#define WORKER_SENDER_JOB_DISCONNECT_RECEIVE_ERROR 12
#define WORKER_SENDER_JOB_DISCONNECT_SEND_ERROR 13
#define WORKER_SENDER_JOB_DISCONNECT_NO_COMPRESSION 14
#if WORKER_UTILIZATION_MAX_JOB_TYPES < 15
#error WORKER_UTILIZATION_MAX_JOB_TYPES has to be at least 15
#endif
extern struct config stream_config;
extern int netdata_use_ssl_on_stream;
extern char *netdata_ssl_ca_path;
extern char *netdata_ssl_ca_file;
// Collector thread starting a transmission
void sender_start(struct sender_state *s) {
netdata_mutex_lock(&s->mutex);
buffer_flush(s->build);
}
static inline void rrdpush_sender_thread_close_socket(RRDHOST *host);
#ifdef ENABLE_COMPRESSION
/*
* In case of stream compression buffer oveflow
* Inform the user through the error log file and
* deactivate compression by downgrading the stream protocol.
*/
static inline void deactivate_compression(struct sender_state *s) {
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_NO_COMPRESSION);
error("STREAM_COMPRESSION: Deactivating compression to avoid stream corruption");
default_compression_enabled = 0;
s->rrdpush_compression = 0;
s->version = STREAM_VERSION_CLABELS;
error("STREAM_COMPRESSION %s [send to %s]: Restarting connection without compression", s->host->hostname, s->connected_to);
rrdpush_sender_thread_close_socket(s->host);
}
#endif
// Collector thread finishing a transmission
void sender_commit(struct sender_state *s) {
char *src = (char *)buffer_tostring(s->host->sender->build);
size_t src_len = s->host->sender->build->len;
#ifdef ENABLE_COMPRESSION
if (src && src_len) {
if (s->compressor && s->rrdpush_compression) {
src_len = s->compressor->compress(s->compressor, src, src_len, &src);
if (!src_len) {
deactivate_compression(s);
buffer_flush(s->build);
netdata_mutex_unlock(&s->mutex);
return;
}
}
if(cbuffer_add_unsafe(s->host->sender->buffer, src, src_len))
s->overflow = 1;
}
#else
if(cbuffer_add_unsafe(s->host->sender->buffer, src, src_len))
s->overflow = 1;
#endif
buffer_flush(s->build);
netdata_mutex_unlock(&s->mutex);
}
static inline void rrdpush_sender_thread_close_socket(RRDHOST *host) {
host->rrdpush_sender_connected = 0;
if(host->rrdpush_sender_socket != -1) {
close(host->rrdpush_sender_socket);
host->rrdpush_sender_socket = -1;
}
}
static inline void rrdpush_sender_add_host_variable_to_buffer_nolock(RRDHOST *host, RRDVAR *rv) {
NETDATA_DOUBLE *value = (NETDATA_DOUBLE *)rv->value;
buffer_sprintf(
host->sender->build
, "VARIABLE HOST %s = " NETDATA_DOUBLE_FORMAT "\n"
, rv->name
, *value
);
debug(D_STREAM, "RRDVAR pushed HOST VARIABLE %s = " NETDATA_DOUBLE_FORMAT, rv->name, *value);
}
void rrdpush_sender_send_this_host_variable_now(RRDHOST *host, RRDVAR *rv) {
if(host->rrdpush_send_enabled && host->rrdpush_sender_spawn && host->rrdpush_sender_connected) {
sender_start(host->sender);
rrdpush_sender_add_host_variable_to_buffer_nolock(host, rv);
sender_commit(host->sender);
}
}
static int rrdpush_sender_thread_custom_host_variables_callback(void *rrdvar_ptr, void *host_ptr) {
RRDVAR *rv = (RRDVAR *)rrdvar_ptr;
RRDHOST *host = (RRDHOST *)host_ptr;
if(unlikely(rv->options & RRDVAR_OPTION_CUSTOM_HOST_VAR && rv->type == RRDVAR_TYPE_CALCULATED)) {
rrdpush_sender_add_host_variable_to_buffer_nolock(host, rv);
// return 1, so that the traversal will return the number of variables sent
return 1;
}
// returning a negative number will break the traversal
return 0;
}
static void rrdpush_sender_thread_send_custom_host_variables(RRDHOST *host) {
sender_start(host->sender);
int ret = rrdvar_callback_for_all_host_variables(host, rrdpush_sender_thread_custom_host_variables_callback, host);
(void)ret;
sender_commit(host->sender);
debug(D_STREAM, "RRDVAR sent %d VARIABLES", ret);
}
// resets all the chart, so that their definitions
// will be resent to the central netdata
static void rrdpush_sender_thread_reset_all_charts(RRDHOST *host) {
rrdhost_rdlock(host);
RRDSET *st;
rrdset_foreach_read(st, host) {
rrdset_flag_clear(st, RRDSET_FLAG_UPSTREAM_EXPOSED);
st->upstream_resync_time = 0;
rrdset_rdlock(st);
RRDDIM *rd;
rrddim_foreach_read(rd, st)
rd->exposed = 0;
rrdset_unlock(st);
}
rrdhost_unlock(host);
}
static inline void rrdpush_sender_thread_data_flush(RRDHOST *host) {
netdata_mutex_lock(&host->sender->mutex);
size_t len = cbuffer_next_unsafe(host->sender->buffer, NULL);
if (len)
error("STREAM %s [send]: discarding %zu bytes of metrics already in the buffer.", host->hostname, len);
cbuffer_remove_unsafe(host->sender->buffer, len);
netdata_mutex_unlock(&host->sender->mutex);
rrdpush_sender_thread_reset_all_charts(host);
rrdpush_sender_thread_send_custom_host_variables(host);
}
static inline void rrdpush_set_flags_to_newest_stream(RRDHOST *host) {
rrdhost_flag_set(host, RRDHOST_FLAG_STREAM_LABELS_UPDATE);
rrdhost_flag_clear(host, RRDHOST_FLAG_STREAM_LABELS_STOP);
}
void rrdpush_encode_variable(stream_encoded_t *se, RRDHOST *host)
{
se->os_name = (host->system_info->host_os_name)?url_encode(host->system_info->host_os_name):"";
se->os_id = (host->system_info->host_os_id)?url_encode(host->system_info->host_os_id):"";
se->os_version = (host->system_info->host_os_version)?url_encode(host->system_info->host_os_version):"";
se->kernel_name = (host->system_info->kernel_name)?url_encode(host->system_info->kernel_name):"";
se->kernel_version = (host->system_info->kernel_version)?url_encode(host->system_info->kernel_version):"";
}
void rrdpush_clean_encoded(stream_encoded_t *se)
{
if (se->os_name)
freez(se->os_name);
if (se->os_id)
freez(se->os_id);
if (se->os_version)
freez(se->os_version);
if (se->kernel_name)
freez(se->kernel_name);
if (se->kernel_version)
freez(se->kernel_version);
}
static inline long int parse_stream_version_for_errors(char *http)
{
if (!memcmp(http, START_STREAMING_ERROR_SAME_LOCALHOST, sizeof(START_STREAMING_ERROR_SAME_LOCALHOST)))
return -2;
else if (!memcmp(http, START_STREAMING_ERROR_ALREADY_STREAMING, sizeof(START_STREAMING_ERROR_ALREADY_STREAMING)))
return -3;
else if (!memcmp(http, START_STREAMING_ERROR_NOT_PERMITTED, sizeof(START_STREAMING_ERROR_NOT_PERMITTED)))
return -4;
else
return -1;
}
static inline long int parse_stream_version(RRDHOST *host, char *http)
{
long int stream_version = -1;
int answer = -1;
char *stream_version_start = strchr(http, '=');
if (stream_version_start) {
stream_version_start++;
stream_version = strtol(stream_version_start, NULL, 10);
answer = memcmp(http, START_STREAMING_PROMPT_VN, (size_t)(stream_version_start - http));
if (!answer) {
rrdpush_set_flags_to_newest_stream(host);
}
} else {
answer = memcmp(http, START_STREAMING_PROMPT_V2, strlen(START_STREAMING_PROMPT_V2));
if (!answer) {
stream_version = 1;
rrdpush_set_flags_to_newest_stream(host);
} else {
answer = memcmp(http, START_STREAMING_PROMPT, strlen(START_STREAMING_PROMPT));
if (!answer) {
stream_version = 0;
rrdhost_flag_set(host, RRDHOST_FLAG_STREAM_LABELS_STOP);
rrdhost_flag_clear(host, RRDHOST_FLAG_STREAM_LABELS_UPDATE);
}
else {
stream_version = parse_stream_version_for_errors(http);
}
}
}
return stream_version;
}
static int rrdpush_sender_thread_connect_to_parent(RRDHOST *host, int default_port, int timeout,
struct sender_state *s) {
struct timeval tv = {
.tv_sec = timeout,
.tv_usec = 0
};
// make sure the socket is closed
rrdpush_sender_thread_close_socket(host);
debug(D_STREAM, "STREAM: Attempting to connect...");
info("STREAM %s [send to %s]: connecting...", host->hostname, host->rrdpush_send_destination);
host->rrdpush_sender_socket = connect_to_one_of_destinations(
host->destinations
, default_port
, &tv
, &s->reconnects_counter
, s->connected_to
, sizeof(s->connected_to)-1
, &host->destination
);
if(unlikely(host->rrdpush_sender_socket == -1)) {
error("STREAM %s [send to %s]: failed to connect", host->hostname, host->rrdpush_send_destination);
return 0;
}
info("STREAM %s [send to %s]: initializing communication...", host->hostname, s->connected_to);
#ifdef ENABLE_HTTPS
if( netdata_client_ctx ){
host->ssl.flags = NETDATA_SSL_START;
if (!host->ssl.conn){
host->ssl.conn = SSL_new(netdata_client_ctx);
if(!host->ssl.conn){
error("Failed to allocate SSL structure.");
host->ssl.flags = NETDATA_SSL_NO_HANDSHAKE;
}
}
else{
SSL_clear(host->ssl.conn);
}
if (host->ssl.conn)
{
if (SSL_set_fd(host->ssl.conn, host->rrdpush_sender_socket) != 1) {
error("Failed to set the socket to the SSL on socket fd %d.", host->rrdpush_sender_socket);
host->ssl.flags = NETDATA_SSL_NO_HANDSHAKE;
} else{
host->ssl.flags = NETDATA_SSL_HANDSHAKE_COMPLETE;
}
}
}
else {
host->ssl.flags = NETDATA_SSL_NO_HANDSHAKE;
}
#endif
#ifdef ENABLE_COMPRESSION
// Negotiate stream VERSION_CLABELS if stream compression is not supported
s->rrdpush_compression = (default_compression_enabled && (s->version >= STREAM_VERSION_COMPRESSION));
if(!s->rrdpush_compression)
s->version = STREAM_VERSION_CLABELS;
#endif //ENABLE_COMPRESSION
/* TODO: During the implementation of #7265 switch the set of variables to HOST_* and CONTAINER_* if the
version negotiation resulted in a high enough version.
*/
stream_encoded_t se;
rrdpush_encode_variable(&se, host);
char http[HTTP_HEADER_SIZE + 1];
int eol = snprintfz(http, HTTP_HEADER_SIZE,
"STREAM "
"key=%s"
"&hostname=%s"
"&registry_hostname=%s"
"&machine_guid=%s"
"&update_every=%d"
"&os=%s"
"&timezone=%s"
"&abbrev_timezone=%s"
"&utc_offset=%d"
"&hops=%d"
"&ml_capable=%d"
"&ml_enabled=%d"
"&mc_version=%d"
"&tags=%s"
"&ver=%d"
"&NETDATA_INSTANCE_CLOUD_TYPE=%s"
"&NETDATA_INSTANCE_CLOUD_INSTANCE_TYPE=%s"
"&NETDATA_INSTANCE_CLOUD_INSTANCE_REGION=%s"
"&NETDATA_SYSTEM_OS_NAME=%s"
"&NETDATA_SYSTEM_OS_ID=%s"
"&NETDATA_SYSTEM_OS_ID_LIKE=%s"
"&NETDATA_SYSTEM_OS_VERSION=%s"
"&NETDATA_SYSTEM_OS_VERSION_ID=%s"
"&NETDATA_SYSTEM_OS_DETECTION=%s"
"&NETDATA_HOST_IS_K8S_NODE=%s"
"&NETDATA_SYSTEM_KERNEL_NAME=%s"
"&NETDATA_SYSTEM_KERNEL_VERSION=%s"
"&NETDATA_SYSTEM_ARCHITECTURE=%s"
"&NETDATA_SYSTEM_VIRTUALIZATION=%s"
"&NETDATA_SYSTEM_VIRT_DETECTION=%s"
"&NETDATA_SYSTEM_CONTAINER=%s"
"&NETDATA_SYSTEM_CONTAINER_DETECTION=%s"
"&NETDATA_CONTAINER_OS_NAME=%s"
"&NETDATA_CONTAINER_OS_ID=%s"
"&NETDATA_CONTAINER_OS_ID_LIKE=%s"
"&NETDATA_CONTAINER_OS_VERSION=%s"
"&NETDATA_CONTAINER_OS_VERSION_ID=%s"
"&NETDATA_CONTAINER_OS_DETECTION=%s"
"&NETDATA_SYSTEM_CPU_LOGICAL_CPU_COUNT=%s"
"&NETDATA_SYSTEM_CPU_FREQ=%s"
"&NETDATA_SYSTEM_TOTAL_RAM=%s"
"&NETDATA_SYSTEM_TOTAL_DISK_SIZE=%s"
"&NETDATA_PROTOCOL_VERSION=%s"
" HTTP/1.1\r\n"
"User-Agent: %s/%s\r\n"
"Accept: */*\r\n\r\n"
, host->rrdpush_send_api_key
, host->hostname
, host->registry_hostname
, host->machine_guid
, default_rrd_update_every
, host->os
, host->timezone
, host->abbrev_timezone
, host->utc_offset
, host->system_info->hops + 1
, host->system_info->ml_capable
, host->system_info->ml_enabled
, host->system_info->mc_version
, (host->tags) ? host->tags : ""
, s->version
, (host->system_info->cloud_provider_type) ? host->system_info->cloud_provider_type : ""
, (host->system_info->cloud_instance_type) ? host->system_info->cloud_instance_type : ""
, (host->system_info->cloud_instance_region) ? host->system_info->cloud_instance_region : ""
, se.os_name
, se.os_id
, (host->system_info->host_os_id_like) ? host->system_info->host_os_id_like : ""
, se.os_version
, (host->system_info->host_os_version_id) ? host->system_info->host_os_version_id : ""
, (host->system_info->host_os_detection) ? host->system_info->host_os_detection : ""
, (host->system_info->is_k8s_node) ? host->system_info->is_k8s_node : ""
, se.kernel_name
, se.kernel_version
, (host->system_info->architecture) ? host->system_info->architecture : ""
, (host->system_info->virtualization) ? host->system_info->virtualization : ""
, (host->system_info->virt_detection) ? host->system_info->virt_detection : ""
, (host->system_info->container) ? host->system_info->container : ""
, (host->system_info->container_detection) ? host->system_info->container_detection : ""
, (host->system_info->container_os_name) ? host->system_info->container_os_name : ""
, (host->system_info->container_os_id) ? host->system_info->container_os_id : ""
, (host->system_info->container_os_id_like) ? host->system_info->container_os_id_like : ""
, (host->system_info->container_os_version) ? host->system_info->container_os_version : ""
, (host->system_info->container_os_version_id) ? host->system_info->container_os_version_id : ""
, (host->system_info->container_os_detection) ? host->system_info->container_os_detection : ""
, (host->system_info->host_cores) ? host->system_info->host_cores : ""
, (host->system_info->host_cpu_freq) ? host->system_info->host_cpu_freq : ""
, (host->system_info->host_ram_total) ? host->system_info->host_ram_total : ""
, (host->system_info->host_disk_space) ? host->system_info->host_disk_space : ""
, STREAMING_PROTOCOL_VERSION
, host->program_name
, host->program_version
);
http[eol] = 0x00;
rrdpush_clean_encoded(&se);
#ifdef ENABLE_HTTPS
if (!host->ssl.flags) {
ERR_clear_error();
SSL_set_connect_state(host->ssl.conn);
int err = SSL_connect(host->ssl.conn);
if (err != 1){
err = SSL_get_error(host->ssl.conn, err);
error("SSL cannot connect with the server: %s ",ERR_error_string((long)SSL_get_error(host->ssl.conn,err),NULL));
if (netdata_use_ssl_on_stream == NETDATA_SSL_FORCE) {
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_SSL_ERROR);
rrdpush_sender_thread_close_socket(host);
if (host->destination->next)
host->destination->disabled_no_proper_reply = 1;
return 0;
}else {
host->ssl.flags = NETDATA_SSL_NO_HANDSHAKE;
}
}
else {
if (netdata_use_ssl_on_stream == NETDATA_SSL_FORCE) {
if (netdata_validate_server == NETDATA_SSL_VALID_CERTIFICATE) {
if ( security_test_certificate(host->ssl.conn)) {
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_SSL_ERROR);
error("Closing the stream connection, because the server SSL certificate is not valid.");
rrdpush_sender_thread_close_socket(host);
if (host->destination->next)
host->destination->disabled_no_proper_reply = 1;
return 0;
}
}
}
}
}
if(send_timeout(&host->ssl,host->rrdpush_sender_socket, http, strlen(http), 0, timeout) == -1) {
#else
if(send_timeout(host->rrdpush_sender_socket, http, strlen(http), 0, timeout) == -1) {
#endif
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_TIMEOUT);
error("STREAM %s [send to %s]: failed to send HTTP header to remote netdata.", host->hostname, s->connected_to);
rrdpush_sender_thread_close_socket(host);
return 0;
}
info("STREAM %s [send to %s]: waiting response from remote netdata...", host->hostname, s->connected_to);
ssize_t received;
#ifdef ENABLE_HTTPS
received = recv_timeout(&host->ssl,host->rrdpush_sender_socket, http, HTTP_HEADER_SIZE, 0, timeout);
if(received == -1) {
#else
received = recv_timeout(host->rrdpush_sender_socket, http, HTTP_HEADER_SIZE, 0, timeout);
if(received == -1) {
#endif
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_TIMEOUT);
error("STREAM %s [send to %s]: remote netdata does not respond.", host->hostname, s->connected_to);
rrdpush_sender_thread_close_socket(host);
return 0;
}
http[received] = '\0';
debug(D_STREAM, "Response to sender from far end: %s", http);
int32_t version = (int32_t)parse_stream_version(host, http);
if(version == -1) {
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE);
error("STREAM %s [send to %s]: server is not replying properly (is it a netdata?).", host->hostname, s->connected_to);
rrdpush_sender_thread_close_socket(host);
//catch other reject reasons and force to check other destinations
if (host->destination->next)
host->destination->disabled_no_proper_reply = 1;
return 0;
}
else if(version == -2) {
error("STREAM %s [send to %s]: remote server is the localhost for [%s].", host->hostname, s->connected_to, host->hostname);
rrdpush_sender_thread_close_socket(host);
host->destination->disabled_because_of_localhost = 1;
return 0;
}
else if(version == -3) {
error("STREAM %s [send to %s]: remote server already receives metrics for [%s].", host->hostname, s->connected_to, host->hostname);
rrdpush_sender_thread_close_socket(host);
host->destination->disabled_already_streaming = now_realtime_sec();
return 0;
}
else if(version == -4) {
error("STREAM %s [send to %s]: remote server denied access for [%s].", host->hostname, s->connected_to, host->hostname);
rrdpush_sender_thread_close_socket(host);
if (host->destination->next)
host->destination->disabled_because_of_denied_access = 1;
return 0;
}
s->version = version;
#ifdef ENABLE_COMPRESSION
s->rrdpush_compression = (s->rrdpush_compression && (s->version >= STREAM_VERSION_COMPRESSION));
if(s->rrdpush_compression)
{
// parent supports compression
if(s->compressor)
s->compressor->reset(s->compressor);
}
else {
//parent does not support compression or has compression disabled
debug(D_STREAM, "Stream is uncompressed! One of the agents (%s <-> %s) does not support compression OR compression is disabled.", s->connected_to, s->host->hostname);
infoerr("Stream is uncompressed! One of the agents (%s <-> %s) does not support compression OR compression is disabled.", s->connected_to, s->host->hostname);
s->version = STREAM_VERSION_CLABELS;
}
#endif //ENABLE_COMPRESSION
info("STREAM %s [send to %s]: established communication with a parent using protocol version %d - ready to send metrics..."
, host->hostname
, s->connected_to
, s->version);
if(sock_setnonblock(host->rrdpush_sender_socket) < 0)
error("STREAM %s [send to %s]: cannot set non-blocking mode for socket.", host->hostname, s->connected_to);
if(sock_enlarge_out(host->rrdpush_sender_socket) < 0)
error("STREAM %s [send to %s]: cannot enlarge the socket buffer.", host->hostname, s->connected_to);
debug(D_STREAM, "STREAM: Connected on fd %d...", host->rrdpush_sender_socket);
return 1;
}
static void attempt_to_connect(struct sender_state *state)
{
state->send_attempts = 0;
if(rrdpush_sender_thread_connect_to_parent(state->host, state->default_port, state->timeout, state)) {
state->last_sent_t = now_monotonic_sec();
// reset the buffer, to properly send charts and metrics
rrdpush_sender_thread_data_flush(state->host);
// send from the beginning
state->begin = 0;
// make sure the next reconnection will be immediate
state->not_connected_loops = 0;
// reset the bytes we have sent for this session
state->sent_bytes_on_this_connection = 0;
// let the data collection threads know we are ready
state->host->rrdpush_sender_connected = 1;
}
else {
// increase the failed connections counter
state->not_connected_loops++;
// reset the number of bytes sent
state->sent_bytes_on_this_connection = 0;
// slow re-connection on repeating errors
sleep_usec(USEC_PER_SEC * state->reconnect_delay); // seconds
}
}
// TCP window is open and we have data to transmit.
void attempt_to_send(struct sender_state *s) {
rrdpush_send_labels(s->host);
#ifdef NETDATA_INTERNAL_CHECKS
struct circular_buffer *cb = s->buffer;
#endif
netdata_thread_disable_cancelability();
netdata_mutex_lock(&s->mutex);
char *chunk;
size_t outstanding = cbuffer_next_unsafe(s->buffer, &chunk);
debug(D_STREAM, "STREAM: Sending data. Buffer r=%zu w=%zu s=%zu, next chunk=%zu", cb->read, cb->write, cb->size, outstanding);
ssize_t ret;
#ifdef ENABLE_HTTPS
SSL *conn = s->host->ssl.conn ;
if(conn && !s->host->ssl.flags) {
ret = SSL_write(conn, chunk, outstanding);
} else {
ret = send(s->host->rrdpush_sender_socket, chunk, outstanding, MSG_DONTWAIT);
}
#else
ret = send(s->host->rrdpush_sender_socket, chunk, outstanding, MSG_DONTWAIT);
#endif
if (likely(ret > 0)) {
cbuffer_remove_unsafe(s->buffer, ret);
s->sent_bytes_on_this_connection += ret;
s->sent_bytes += ret;
debug(D_STREAM, "STREAM %s [send to %s]: Sent %zd bytes", s->host->hostname, s->connected_to, ret);
s->last_sent_t = now_monotonic_sec();
}
else if (ret == -1 && (errno == EAGAIN || errno == EINTR || errno == EWOULDBLOCK))
debug(D_STREAM, "STREAM %s [send to %s]: unavailable after polling POLLOUT", s->host->hostname, s->connected_to);
else if (ret == -1) {
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_SEND_ERROR);
debug(D_STREAM, "STREAM: Send failed - closing socket...");
error("STREAM %s [send to %s]: failed to send metrics - closing connection - we have sent %zu bytes on this connection.", s->host->hostname, s->connected_to, s->sent_bytes_on_this_connection);
rrdpush_sender_thread_close_socket(s->host);
}
else {
debug(D_STREAM, "STREAM: send() returned 0 -> no error but no transmission");
}
netdata_mutex_unlock(&s->mutex);
netdata_thread_enable_cancelability();
}
void attempt_read(struct sender_state *s) {
int ret;
#ifdef ENABLE_HTTPS
if (s->host->ssl.conn && !s->host->stream_ssl.flags) {
ERR_clear_error();
int desired = sizeof(s->read_buffer) - s->read_len - 1;
ret = SSL_read(s->host->ssl.conn, s->read_buffer, desired);
if (ret > 0 ) {
s->read_len += ret;
return;
}
int sslerrno = SSL_get_error(s->host->ssl.conn, desired);
if (sslerrno == SSL_ERROR_WANT_READ || sslerrno == SSL_ERROR_WANT_WRITE)
return;
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_SSL_ERROR);
u_long err;
char buf[256];
while ((err = ERR_get_error()) != 0) {
ERR_error_string_n(err, buf, sizeof(buf));
error("STREAM %s [send to %s] ssl error: %s", s->host->hostname, s->connected_to, buf);
}
error("Restarting connection");
rrdpush_sender_thread_close_socket(s->host);
return;
}
#endif
ret = recv(s->host->rrdpush_sender_socket, s->read_buffer + s->read_len, sizeof(s->read_buffer) - s->read_len - 1,MSG_DONTWAIT);
if (ret>0) {
s->read_len += ret;
return;
}
debug(D_STREAM, "Socket was POLLIN, but req %zu bytes gave %d", sizeof(s->read_buffer) - s->read_len - 1, ret);
if (ret<0 && (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR))
return;
if (ret==0) {
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_PARENT_CLOSED);
error("STREAM %s [send to %s]: connection closed by far end. Restarting connection", s->host->hostname, s->connected_to);
}
else {
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_RECEIVE_ERROR);
error("STREAM %s [send to %s]: error during receive (%d). Restarting connection", s->host->hostname, s->connected_to, ret);
}
rrdpush_sender_thread_close_socket(s->host);
}
// This is just a placeholder until the gap filling state machine is inserted
void execute_commands(struct sender_state *s) {
char *start = s->read_buffer, *end = &s->read_buffer[s->read_len], *newline;
*end = 0;
while( start<end && (newline=strchr(start, '\n')) ) {
*newline = 0;
info("STREAM %s [send to %s] received command over connection: %s", s->host->hostname, s->connected_to, start);
start = newline+1;
}
if (start<end) {
memmove(s->read_buffer, start, end-start);
s->read_len = end-start;
}
}
static void rrdpush_sender_thread_cleanup_callback(void *ptr) {
worker_unregister();
RRDHOST *host = (RRDHOST *)ptr;
netdata_mutex_lock(&host->sender->mutex);
info("STREAM %s [send]: sending thread cleans up...", host->hostname);
rrdpush_sender_thread_close_socket(host);
// close the pipe
if(host->rrdpush_sender_pipe[PIPE_READ] != -1) {
close(host->rrdpush_sender_pipe[PIPE_READ]);
host->rrdpush_sender_pipe[PIPE_READ] = -1;
}
if(host->rrdpush_sender_pipe[PIPE_WRITE] != -1) {
close(host->rrdpush_sender_pipe[PIPE_WRITE]);
host->rrdpush_sender_pipe[PIPE_WRITE] = -1;
}
if(!host->rrdpush_sender_join) {
info("STREAM %s [send]: sending thread detaches itself.", host->hostname);
netdata_thread_detach(netdata_thread_self());
}
host->rrdpush_sender_spawn = 0;
info("STREAM %s [send]: sending thread now exits.", host->hostname);
netdata_mutex_unlock(&host->sender->mutex);
}
void sender_init(struct sender_state *s, RRDHOST *parent) {
memset(s, 0, sizeof(*s));
s->host = parent;
s->buffer = cbuffer_new(1024, 1024*1024);
s->build = buffer_create(1);
#ifdef ENABLE_COMPRESSION
s->rrdpush_compression = default_compression_enabled;
if (default_compression_enabled)
s->compressor = create_compressor();
#endif
netdata_mutex_init(&s->mutex);
}
void *rrdpush_sender_thread(void *ptr) {
struct sender_state *s = ptr;
s->task_id = gettid();
if(!s->host->rrdpush_send_enabled || !s->host->rrdpush_send_destination ||
!*s->host->rrdpush_send_destination || !s->host->rrdpush_send_api_key ||
!*s->host->rrdpush_send_api_key) {
error("STREAM %s [send]: thread created (task id %d), but host has streaming disabled.",
s->host->hostname, s->task_id);
return NULL;
}
#ifdef ENABLE_HTTPS
if (netdata_use_ssl_on_stream & NETDATA_SSL_FORCE ){
security_start_ssl(NETDATA_SSL_CONTEXT_STREAMING);
security_location_for_context(netdata_client_ctx, netdata_ssl_ca_file, netdata_ssl_ca_path);
}
#endif
info("STREAM %s [send]: thread created (task id %d)", s->host->hostname, s->task_id);
s->timeout = (int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "timeout seconds", 60);
s->default_port = (int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "default port", 19999);
s->buffer->max_size =
(size_t)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "buffer size bytes", 1024 * 1024 * 10);
s->reconnect_delay =
(unsigned int)appconfig_get_number(&stream_config, CONFIG_SECTION_STREAM, "reconnect delay seconds", 5);
remote_clock_resync_iterations = (unsigned int)appconfig_get_number(
&stream_config, CONFIG_SECTION_STREAM,
"initial clock resync iterations",
remote_clock_resync_iterations); // TODO: REMOVE FOR SLEW / GAPFILLING
// initialize rrdpush globals
s->host->rrdpush_sender_connected = 0;
if(pipe(s->host->rrdpush_sender_pipe) == -1) {
error("STREAM %s [send]: cannot create required pipe. DISABLING STREAMING THREAD", s->host->hostname);
return NULL;
}
s->version = STREAMING_PROTOCOL_CURRENT_VERSION;
enum {
Collector,
Socket
};
struct pollfd fds[2];
fds[Collector].fd = s->host->rrdpush_sender_pipe[PIPE_READ];
fds[Collector].events = POLLIN;
worker_register("STREAMSND");
worker_register_job_name(WORKER_SENDER_JOB_CONNECT, "connect");
worker_register_job_name(WORKER_SENDER_JOB_PIPE_READ, "pipe read");
worker_register_job_name(WORKER_SENDER_JOB_SOCKET_RECEIVE, "receive");
worker_register_job_name(WORKER_SENDER_JOB_EXECUTE, "execute");
worker_register_job_name(WORKER_SENDER_JOB_SOCKET_SEND, "send");
// disconnection reasons
worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_TIMEOUT, "disconnect timeout");
worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_POLL_ERROR, "disconnect poll error");
worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_SOCKER_ERROR, "disconnect socket error");
worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_OVERFLOW, "disconnect overflow");
worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_SSL_ERROR, "disconnect ssl error");
worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_PARENT_CLOSED, "disconnect parent closed");
worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_RECEIVE_ERROR, "disconnect receive error");
worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_SEND_ERROR, "disconnect send error");
worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_NO_COMPRESSION, "disconnect no compression");
worker_register_job_name(WORKER_SENDER_JOB_DISCONNECT_BAD_HANDSHAKE, "disconnect bad handshake");
netdata_thread_cleanup_push(rrdpush_sender_thread_cleanup_callback, s->host);
for(; s->host->rrdpush_send_enabled && !netdata_exit ;) {
// check for outstanding cancellation requests
netdata_thread_testcancel();
// The connection attempt blocks (after which we use the socket in nonblocking)
if(unlikely(s->host->rrdpush_sender_socket == -1)) {
worker_is_busy(WORKER_SENDER_JOB_CONNECT);
s->overflow = 0;
s->read_len = 0;
s->buffer->read = 0;
s->buffer->write = 0;
attempt_to_connect(s);
if (s->version >= VERSION_GAP_FILLING) {
time_t now = now_realtime_sec();
sender_start(s);
buffer_sprintf(s->build, "TIMESTAMP %"PRId64"", (int64_t)now);
sender_commit(s);
}
rrdpush_claimed_id(s->host);
continue;
}
// If the TCP window never opened then something is wrong, restart connection
if(unlikely(now_monotonic_sec() - s->last_sent_t > s->timeout)) {
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_TIMEOUT);
error("STREAM %s [send to %s]: could not send metrics for %d seconds - closing connection - we have sent %zu bytes on this connection via %zu send attempts.", s->host->hostname, s->connected_to, s->timeout, s->sent_bytes_on_this_connection, s->send_attempts);
rrdpush_sender_thread_close_socket(s->host);
continue;
}
worker_is_idle();
// Wait until buffer opens in the socket or a rrdset_done_push wakes us
fds[Collector].revents = 0;
fds[Socket].revents = 0;
fds[Socket].fd = s->host->rrdpush_sender_socket;
netdata_mutex_lock(&s->mutex);
char *chunk;
size_t outstanding = cbuffer_next_unsafe(s->host->sender->buffer, &chunk);
chunk = NULL; // Do not cache pointer outside of region - could be invalidated
netdata_mutex_unlock(&s->mutex);
if(outstanding) {
s->send_attempts++;
fds[Socket].events = POLLIN | POLLOUT;
}
else {
fds[Socket].events = POLLIN;
}
int retval = poll(fds, 2, 1000);
debug(D_STREAM, "STREAM: poll() finished collector=%d socket=%d (current chunk %zu bytes)...",
fds[Collector].revents, fds[Socket].revents, outstanding);
if(unlikely(netdata_exit)) break;
// Spurious wake-ups without error - loop again
if (retval == 0 || ((retval == -1) && (errno == EAGAIN || errno == EINTR))) {
debug(D_STREAM, "Spurious wakeup");
continue;
}
// Only errors from poll() are internal, but try restarting the connection
if(unlikely(retval == -1)) {
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_POLL_ERROR);
error("STREAM %s [send to %s]: failed to poll(). Closing socket.", s->host->hostname, s->connected_to);
rrdpush_sender_thread_close_socket(s->host);
continue;
}
// If the collector woke us up then empty the pipe to remove the signal
if (fds[Collector].revents & POLLIN || fds[Collector].revents & POLLPRI) {
worker_is_busy(WORKER_SENDER_JOB_PIPE_READ);
debug(D_STREAM, "STREAM: Data added to send buffer (current buffer chunk %zu bytes)...", outstanding);
char buffer[1000 + 1];
if (read(s->host->rrdpush_sender_pipe[PIPE_READ], buffer, 1000) == -1)
error("STREAM %s [send to %s]: cannot read from internal pipe.", s->host->hostname, s->connected_to);
}
// Read as much as possible to fill the buffer, split into full lines for execution.
if (fds[Socket].revents & POLLIN) {
worker_is_busy(WORKER_SENDER_JOB_SOCKET_RECEIVE);
attempt_read(s);
}
worker_is_busy(WORKER_SENDER_JOB_EXECUTE);
execute_commands(s);
// If we have data and have seen the TCP window open then try to close it by a transmission.
if (outstanding && fds[Socket].revents & POLLOUT) {
worker_is_busy(WORKER_SENDER_JOB_SOCKET_SEND);
attempt_to_send(s);
}
// TODO-GAPS - why do we only check this on the socket, not the pipe?
if (outstanding) {
char *error = NULL;
if (unlikely(fds[Socket].revents & POLLERR))
error = "socket reports errors (POLLERR)";
else if (unlikely(fds[Socket].revents & POLLHUP))
error = "connection closed by remote end (POLLHUP)";
else if (unlikely(fds[Socket].revents & POLLNVAL))
error = "connection is invalid (POLLNVAL)";
if(unlikely(error)) {
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_SOCKER_ERROR);
error("STREAM %s [send to %s]: restart stream because %s - %zu bytes transmitted.", s->host->hostname,
s->connected_to, error, s->sent_bytes_on_this_connection);
rrdpush_sender_thread_close_socket(s->host);
}
}
// protection from overflow
if (s->overflow) {
worker_is_busy(WORKER_SENDER_JOB_DISCONNECT_OVERFLOW);
errno = 0;
error("STREAM %s [send to %s]: buffer full (%zu-bytes) after %zu bytes. Restarting connection",
s->host->hostname, s->connected_to, s->buffer->size, s->sent_bytes_on_this_connection);
rrdpush_sender_thread_close_socket(s->host);
}
}
netdata_thread_cleanup_pop(1);
return NULL;
}
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