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|
// SPDX-License-Identifier: GPL-3.0-or-later
#include "common.h"
static uv_thread_t thread;
static uv_loop_t* loop;
static uv_async_t async;
static struct completion completion;
static uv_pipe_t server_pipe;
char cmd_prefix_by_status[] = {
CMD_PREFIX_INFO,
CMD_PREFIX_ERROR,
CMD_PREFIX_ERROR
};
static int command_server_initialized = 0;
static int command_thread_error;
static int command_thread_shutdown;
static unsigned clients = 0;
struct command_context {
/* embedded client pipe structure at address 0 */
uv_pipe_t client;
uv_work_t work;
uv_write_t write_req;
cmd_t idx;
char *args;
char *message;
cmd_status_t status;
char command_string[MAX_COMMAND_LENGTH];
unsigned command_string_size;
};
/* Forward declarations */
static cmd_status_t cmd_help_execute(char *args, char **message);
static cmd_status_t cmd_reload_health_execute(char *args, char **message);
static cmd_status_t cmd_reopen_logs_execute(char *args, char **message);
static cmd_status_t cmd_exit_execute(char *args, char **message);
static cmd_status_t cmd_fatal_execute(char *args, char **message);
static cmd_status_t cmd_reload_claiming_state_execute(char *args, char **message);
static cmd_status_t cmd_reload_labels_execute(char *args, char **message);
static cmd_status_t cmd_read_config_execute(char *args, char **message);
static cmd_status_t cmd_write_config_execute(char *args, char **message);
static cmd_status_t cmd_ping_execute(char *args, char **message);
static cmd_status_t cmd_aclk_state(char *args, char **message);
static cmd_status_t cmd_version(char *args, char **message);
static cmd_status_t cmd_dumpconfig(char *args, char **message);
#ifdef ENABLE_ACLK
static cmd_status_t cmd_remove_node(char *args, char **message);
#endif
static command_info_t command_info_array[] = {
{"help", cmd_help_execute, CMD_TYPE_HIGH_PRIORITY}, // show help menu
{"reload-health", cmd_reload_health_execute, CMD_TYPE_ORTHOGONAL}, // reload health configuration
{"reopen-logs", cmd_reopen_logs_execute, CMD_TYPE_ORTHOGONAL}, // Close and reopen log files
{"shutdown-agent", cmd_exit_execute, CMD_TYPE_EXCLUSIVE}, // exit cleanly
{"fatal-agent", cmd_fatal_execute, CMD_TYPE_HIGH_PRIORITY}, // exit with fatal error
{"reload-claiming-state", cmd_reload_claiming_state_execute, CMD_TYPE_ORTHOGONAL}, // reload claiming state
{"reload-labels", cmd_reload_labels_execute, CMD_TYPE_ORTHOGONAL}, // reload the labels
{"read-config", cmd_read_config_execute, CMD_TYPE_CONCURRENT},
{"write-config", cmd_write_config_execute, CMD_TYPE_ORTHOGONAL},
{"ping", cmd_ping_execute, CMD_TYPE_ORTHOGONAL},
{"aclk-state", cmd_aclk_state, CMD_TYPE_ORTHOGONAL},
{"version", cmd_version, CMD_TYPE_ORTHOGONAL},
{"dumpconfig", cmd_dumpconfig, CMD_TYPE_ORTHOGONAL},
#ifdef ENABLE_ACLK
{"remove-stale-node", cmd_remove_node, CMD_TYPE_ORTHOGONAL}
#endif
};
/* Mutexes for commands of type CMD_TYPE_ORTHOGONAL */
static uv_mutex_t command_lock_array[CMD_TOTAL_COMMANDS];
/* Commands of type CMD_TYPE_EXCLUSIVE are writers */
static uv_rwlock_t exclusive_rwlock;
/*
* Locking order:
* 1. exclusive_rwlock
* 2. command_lock_array[]
*/
/* Forward declarations */
static void cmd_lock_exclusive(unsigned index);
static void cmd_lock_orthogonal(unsigned index);
static void cmd_lock_idempotent(unsigned index);
static void cmd_lock_high_priority(unsigned index);
static command_lock_t *cmd_lock_by_type[] = {
cmd_lock_exclusive,
cmd_lock_orthogonal,
cmd_lock_idempotent,
cmd_lock_high_priority
};
/* Forward declarations */
static void cmd_unlock_exclusive(unsigned index);
static void cmd_unlock_orthogonal(unsigned index);
static void cmd_unlock_idempotent(unsigned index);
static void cmd_unlock_high_priority(unsigned index);
static command_lock_t *cmd_unlock_by_type[] = {
cmd_unlock_exclusive,
cmd_unlock_orthogonal,
cmd_unlock_idempotent,
cmd_unlock_high_priority
};
static cmd_status_t cmd_help_execute(char *args, char **message)
{
(void)args;
*message = mallocz(MAX_COMMAND_LENGTH);
strncpyz(*message,
"\nThe commands are:\n\n"
"help\n"
" Show this help menu.\n\n"
"reload-health\n"
" Reload health configuration.\n\n"
"reload-labels\n"
" Reload all labels.\n\n"
"save-database\n"
" Save internal DB to disk for memory mode save.\n\n"
"reopen-logs\n"
" Close and reopen log files.\n\n"
"shutdown-agent\n"
" Cleanup and exit the netdata agent.\n\n"
"fatal-agent\n"
" Log the state and halt the netdata agent.\n\n"
"reload-claiming-state\n"
" Reload agent claiming state from disk.\n\n"
"ping\n"
" Return with 'pong' if agent is alive.\n\n"
"aclk-state [json]\n"
" Returns current state of ACLK and Cloud connection. (optionally in json).\n\n"
"dumpconfig\n"
" Returns the current netdata.conf on stdout.\n\n"
#ifdef ENABLE_ACLK
"remove-stale-node <node_id | machine_guid | hostname | ALL_NODES>\n"
" Unregisters and removes a node from the cloud.\n\n"
#endif
"version\n"
" Returns the netdata version.\n",
MAX_COMMAND_LENGTH - 1);
return CMD_STATUS_SUCCESS;
}
static cmd_status_t cmd_reload_health_execute(char *args, char **message)
{
(void)args;
(void)message;
nd_log_limits_unlimited();
netdata_log_info("COMMAND: Reloading HEALTH configuration.");
health_plugin_reload();
nd_log_limits_reset();
return CMD_STATUS_SUCCESS;
}
static cmd_status_t cmd_reopen_logs_execute(char *args, char **message)
{
(void)args;
(void)message;
nd_log_limits_unlimited();
nd_log_reopen_log_files(true);
nd_log_limits_reset();
return CMD_STATUS_SUCCESS;
}
static cmd_status_t cmd_exit_execute(char *args, char **message)
{
(void)args;
(void)message;
nd_log_limits_unlimited();
netdata_log_info("COMMAND: Cleaning up to exit.");
netdata_cleanup_and_exit(0, NULL, NULL, NULL);
exit(0);
return CMD_STATUS_SUCCESS;
}
static cmd_status_t cmd_fatal_execute(char *args, char **message)
{
(void)args;
(void)message;
fatal("COMMAND: netdata now exits.");
return CMD_STATUS_SUCCESS;
}
static cmd_status_t cmd_reload_claiming_state_execute(char *args, char **message)
{
(void)args;
(void)message;
#if defined(DISABLE_CLOUD) || !defined(ENABLE_ACLK)
netdata_log_info("The claiming feature has been explicitly disabled");
*message = strdupz("This agent cannot be claimed, it was built without support for Cloud");
return CMD_STATUS_FAILURE;
#endif
netdata_log_info("COMMAND: Reloading Agent Claiming configuration.");
claim_reload_all();
return CMD_STATUS_SUCCESS;
}
static cmd_status_t cmd_reload_labels_execute(char *args, char **message)
{
(void)args;
netdata_log_info("COMMAND: reloading host labels.");
reload_host_labels();
aclk_queue_node_info(localhost, 1);
BUFFER *wb = buffer_create(10, NULL);
rrdlabels_log_to_buffer(localhost->rrdlabels, wb);
(*message)=strdupz(buffer_tostring(wb));
buffer_free(wb);
return CMD_STATUS_SUCCESS;
}
static cmd_status_t cmd_read_config_execute(char *args, char **message)
{
size_t n = strlen(args);
char *separator = strchr(args,'|');
if (separator == NULL)
return CMD_STATUS_FAILURE;
char *separator2 = strchr(separator + 1,'|');
if (separator2 == NULL)
return CMD_STATUS_FAILURE;
char *temp = callocz(n + 1, 1);
strcpy(temp, args);
size_t offset = separator - args;
temp[offset] = 0;
size_t offset2 = separator2 - args;
temp[offset2] = 0;
const char *conf_file = temp; /* "cloud" is cloud.conf, otherwise netdata.conf */
struct config *tmp_config = strcmp(conf_file, "cloud") ? &netdata_config : &cloud_config;
char *value = appconfig_get(tmp_config, temp + offset + 1, temp + offset2 + 1, NULL);
if (value == NULL)
{
netdata_log_error("Cannot execute read-config conf_file=%s section=%s / key=%s because no value set",
conf_file,
temp + offset + 1,
temp + offset2 + 1);
freez(temp);
return CMD_STATUS_FAILURE;
}
else
{
(*message) = strdupz(value);
freez(temp);
return CMD_STATUS_SUCCESS;
}
}
static cmd_status_t cmd_write_config_execute(char *args, char **message)
{
UNUSED(message);
netdata_log_info("write-config %s", args);
size_t n = strlen(args);
char *separator = strchr(args,'|');
if (separator == NULL)
return CMD_STATUS_FAILURE;
char *separator2 = strchr(separator + 1,'|');
if (separator2 == NULL)
return CMD_STATUS_FAILURE;
char *separator3 = strchr(separator2 + 1,'|');
if (separator3 == NULL)
return CMD_STATUS_FAILURE;
char *temp = callocz(n + 1, 1);
strcpy(temp, args);
size_t offset = separator - args;
temp[offset] = 0;
size_t offset2 = separator2 - args;
temp[offset2] = 0;
size_t offset3 = separator3 - args;
temp[offset3] = 0;
const char *conf_file = temp; /* "cloud" is cloud.conf, otherwise netdata.conf */
struct config *tmp_config = strcmp(conf_file, "cloud") ? &netdata_config : &cloud_config;
appconfig_set(tmp_config, temp + offset + 1, temp + offset2 + 1, temp + offset3 + 1);
netdata_log_info("write-config conf_file=%s section=%s key=%s value=%s",conf_file, temp + offset + 1, temp + offset2 + 1,
temp + offset3 + 1);
freez(temp);
return CMD_STATUS_SUCCESS;
}
static cmd_status_t cmd_ping_execute(char *args, char **message)
{
(void)args;
*message = strdupz("pong");
return CMD_STATUS_SUCCESS;
}
static cmd_status_t cmd_aclk_state(char *args, char **message)
{
netdata_log_info("COMMAND: Reopening aclk/cloud state.");
#ifdef ENABLE_ACLK
if (strstr(args, "json"))
*message = aclk_state_json();
else
*message = aclk_state();
#else
if (strstr(args, "json"))
*message = strdupz("{\"aclk-available\":false}");
else
*message = strdupz("ACLK Available: No");
#endif
return CMD_STATUS_SUCCESS;
}
static cmd_status_t cmd_version(char *args, char **message)
{
(void)args;
char version[MAX_COMMAND_LENGTH];
snprintfz(version, MAX_COMMAND_LENGTH -1, "%s %s", program_name, NETDATA_VERSION);
*message = strdupz(version);
return CMD_STATUS_SUCCESS;
}
static cmd_status_t cmd_dumpconfig(char *args, char **message)
{
(void)args;
BUFFER *wb = buffer_create(1024, NULL);
config_generate(wb, 0);
*message = strdupz(buffer_tostring(wb));
buffer_free(wb);
return CMD_STATUS_SUCCESS;
}
#ifdef ENABLE_ACLK
static int remove_ephemeral_host(BUFFER *wb, RRDHOST *host, bool report_error)
{
if (host == localhost) {
if (report_error)
buffer_sprintf(wb, "You cannot unregister the parent node (%s)", rrdhost_hostname(host));
return 0;
}
if (rrdhost_is_online(host)) {
if (report_error)
buffer_sprintf(wb, "Cannot unregister a live node (%s)", rrdhost_hostname(host));
return 0;
}
if (!rrdhost_option_check(host, RRDHOST_OPTION_EPHEMERAL_HOST)) {
rrdhost_option_set(host, RRDHOST_OPTION_EPHEMERAL_HOST);
sql_set_host_label(&host->host_uuid, "_is_ephemeral", "true");
aclk_host_state_update(host, 0, 0);
unregister_node(host->machine_guid);
freez(host->node_id);
host->node_id = NULL;
buffer_sprintf(wb, "Unregistering node with machine guid %s, hostname = %s", host->machine_guid, rrdhost_hostname(host));
rrd_wrlock();
rrdhost_free___while_having_rrd_wrlock(host, true);
rrd_wrunlock();
return 1;
}
if (report_error)
buffer_sprintf(wb, "Node with machine guid %s, hostname = %s is already unregistered", host->machine_guid, rrdhost_hostname(host));
return 0;
}
#define SQL_HOSTNAME_TO_REMOVE "SELECT host_id FROM host WHERE (hostname = @hostname OR @hostname = 'ALL_NODES')"
static cmd_status_t cmd_remove_node(char *args, char **message)
{
(void)args;
BUFFER *wb = buffer_create(1024, NULL);
if (strlen(args) == 0) {
buffer_sprintf(wb, "Please specify a machine or node UUID or hostname");
goto done;
}
RRDHOST *host = NULL;
host = rrdhost_find_by_guid(args);
if (!host)
host = find_host_by_node_id(args);
if (!host) {
sqlite3_stmt *res = NULL;
bool report_error = strcmp(args, "ALL_NODES");
if (!PREPARE_STATEMENT(db_meta, SQL_HOSTNAME_TO_REMOVE, &res)) {
buffer_sprintf(wb, "Failed to prepare database statement to check for stale nodes");
goto done;
}
int param = 0;
SQLITE_BIND_FAIL(done0, sqlite3_bind_text(res, ++param, args, -1, SQLITE_STATIC));
param = 0;
int cnt = 0;
while (sqlite3_step_monitored(res) == SQLITE_ROW) {
char guid[UUID_STR_LEN];
uuid_unparse_lower(*(nd_uuid_t *)sqlite3_column_blob(res, 0), guid);
host = rrdhost_find_by_guid(guid);
if (host) {
if (cnt)
buffer_fast_strcat(wb, "\n", 1);
cnt += remove_ephemeral_host(wb, host, report_error);
}
}
if (!cnt && buffer_strlen(wb) == 0) {
if (report_error)
buffer_sprintf(wb, "No match for \"%s\"", args);
else
buffer_sprintf(wb, "No stale nodes found");
}
done0:
REPORT_BIND_FAIL(res, param);
SQLITE_FINALIZE(res);
}
else
(void) remove_ephemeral_host(wb, host, true);
done:
*message = strdupz(buffer_tostring(wb));
buffer_free(wb);
return CMD_STATUS_SUCCESS;
}
#endif
static void cmd_lock_exclusive(unsigned index)
{
(void)index;
uv_rwlock_wrlock(&exclusive_rwlock);
}
static void cmd_lock_orthogonal(unsigned index)
{
uv_rwlock_rdlock(&exclusive_rwlock);
uv_mutex_lock(&command_lock_array[index]);
}
static void cmd_lock_idempotent(unsigned index)
{
(void)index;
uv_rwlock_rdlock(&exclusive_rwlock);
}
static void cmd_lock_high_priority(unsigned index)
{
(void)index;
}
static void cmd_unlock_exclusive(unsigned index)
{
(void)index;
uv_rwlock_wrunlock(&exclusive_rwlock);
}
static void cmd_unlock_orthogonal(unsigned index)
{
uv_rwlock_rdunlock(&exclusive_rwlock);
uv_mutex_unlock(&command_lock_array[index]);
}
static void cmd_unlock_idempotent(unsigned index)
{
(void)index;
uv_rwlock_rdunlock(&exclusive_rwlock);
}
static void cmd_unlock_high_priority(unsigned index)
{
(void)index;
}
static void pipe_close_cb(uv_handle_t* handle)
{
/* Also frees command context */
freez(handle);
}
static void pipe_write_cb(uv_write_t* req, int status)
{
(void)status;
uv_pipe_t *client = req->data;
uv_close((uv_handle_t *)client, pipe_close_cb);
--clients;
buffer_free(client->data);
// netdata_log_info("Command Clients = %u", clients);
}
static inline void add_char_to_command_reply(BUFFER *reply_string, unsigned *reply_string_size, char character)
{
buffer_fast_charcat(reply_string, character);
*reply_string_size +=1;
}
static inline void add_string_to_command_reply(BUFFER *reply_string, unsigned *reply_string_size, char *str)
{
unsigned len;
len = strlen(str);
buffer_fast_strcat(reply_string, str, len);
*reply_string_size += len;
}
static void send_command_reply(struct command_context *cmd_ctx, cmd_status_t status, char *message)
{
int ret;
BUFFER *reply_string = buffer_create(128, NULL);
char exit_status_string[MAX_EXIT_STATUS_LENGTH + 1] = {'\0', };
unsigned reply_string_size = 0;
uv_buf_t write_buf;
uv_stream_t *client = (uv_stream_t *)(uv_pipe_t *)cmd_ctx;
snprintfz(exit_status_string, MAX_EXIT_STATUS_LENGTH, "%u", status);
add_char_to_command_reply(reply_string, &reply_string_size, CMD_PREFIX_EXIT_CODE);
add_string_to_command_reply(reply_string, &reply_string_size, exit_status_string);
add_char_to_command_reply(reply_string, &reply_string_size, '\0');
if (message) {
add_char_to_command_reply(reply_string, &reply_string_size, cmd_prefix_by_status[status]);
add_string_to_command_reply(reply_string, &reply_string_size, message);
}
cmd_ctx->write_req.data = client;
client->data = reply_string;
write_buf.base = reply_string->buffer;
write_buf.len = reply_string_size;
ret = uv_write(&cmd_ctx->write_req, (uv_stream_t *)client, &write_buf, 1, pipe_write_cb);
if (ret) {
netdata_log_error("uv_write(): %s", uv_strerror(ret));
}
}
cmd_status_t execute_command(cmd_t idx, char *args, char **message)
{
cmd_status_t status;
cmd_type_t type = command_info_array[idx].type;
cmd_lock_by_type[type](idx);
status = command_info_array[idx].func(args, message);
cmd_unlock_by_type[type](idx);
return status;
}
static void after_schedule_command(uv_work_t *req, int status)
{
struct command_context *cmd_ctx = req->data;
(void)status;
send_command_reply(cmd_ctx, cmd_ctx->status, cmd_ctx->message);
if (cmd_ctx->message)
freez(cmd_ctx->message);
}
static void schedule_command(uv_work_t *req)
{
register_libuv_worker_jobs();
worker_is_busy(UV_EVENT_SCHEDULE_CMD);
struct command_context *cmd_ctx = req->data;
cmd_ctx->status = execute_command(cmd_ctx->idx, cmd_ctx->args, &cmd_ctx->message);
worker_is_idle();
}
/* This will alter the state of the command_info_array.cmd_str
*/
static void parse_commands(struct command_context *cmd_ctx)
{
char *message = NULL, *pos, *lstrip, *rstrip;
cmd_t i;
cmd_status_t status;
status = CMD_STATUS_FAILURE;
/* Skip white-space characters */
for (pos = cmd_ctx->command_string ; isspace((uint8_t)*pos) && ('\0' != *pos) ; ++pos) ;
for (i = 0 ; i < CMD_TOTAL_COMMANDS ; ++i) {
if (!strncmp(pos, command_info_array[i].cmd_str, strlen(command_info_array[i].cmd_str))) {
if (CMD_EXIT == i) {
/* musl C does not like libuv workqueues calling exit() */
execute_command(CMD_EXIT, NULL, NULL);
}
for (lstrip=pos + strlen(command_info_array[i].cmd_str); isspace((uint8_t)*lstrip) && ('\0' != *lstrip); ++lstrip) ;
for (rstrip=lstrip+strlen(lstrip)-1; rstrip>lstrip && isspace((uint8_t)*rstrip); *(rstrip--) = 0 ) ;
cmd_ctx->work.data = cmd_ctx;
cmd_ctx->idx = i;
cmd_ctx->args = lstrip;
cmd_ctx->message = NULL;
fatal_assert(0 == uv_queue_work(loop, &cmd_ctx->work, schedule_command, after_schedule_command));
break;
}
}
if (CMD_TOTAL_COMMANDS == i) {
/* no command found */
message = strdupz("Illegal command. Please type \"help\" for instructions.");
send_command_reply(cmd_ctx, status, message);
freez(message);
}
}
static void pipe_read_cb(uv_stream_t *client, ssize_t nread, const uv_buf_t *buf)
{
struct command_context *cmd_ctx = (struct command_context *)client;
if (0 == nread) {
netdata_log_info("%s: Zero bytes read by command pipe.", __func__);
} else if (UV_EOF == nread) {
netdata_log_info("EOF found in command pipe.");
parse_commands(cmd_ctx);
} else if (nread < 0) {
netdata_log_error("%s: %s", __func__, uv_strerror(nread));
}
if (nread < 0) { /* stop stream due to EOF or error */
(void)uv_read_stop((uv_stream_t *)client);
} else if (nread) {
size_t to_copy;
to_copy = MIN((size_t) nread, MAX_COMMAND_LENGTH - 1 - cmd_ctx->command_string_size);
memcpy(cmd_ctx->command_string + cmd_ctx->command_string_size, buf->base, to_copy);
cmd_ctx->command_string_size += to_copy;
cmd_ctx->command_string[cmd_ctx->command_string_size] = '\0';
}
if (buf && buf->len) {
freez(buf->base);
}
if (nread < 0 && UV_EOF != nread) {
uv_close((uv_handle_t *)client, pipe_close_cb);
--clients;
// netdata_log_info("Command Clients = %u", clients);
}
}
static void alloc_cb(uv_handle_t *handle, size_t suggested_size, uv_buf_t *buf)
{
(void)handle;
buf->base = mallocz(suggested_size);
buf->len = suggested_size;
}
static void connection_cb(uv_stream_t *server, int status)
{
int ret;
uv_pipe_t *client;
struct command_context *cmd_ctx;
fatal_assert(status == 0);
/* combined allocation of client pipe and command context */
cmd_ctx = mallocz(sizeof(*cmd_ctx));
client = (uv_pipe_t *)cmd_ctx;
ret = uv_pipe_init(server->loop, client, 1);
if (ret) {
netdata_log_error("uv_pipe_init(): %s", uv_strerror(ret));
freez(cmd_ctx);
return;
}
ret = uv_accept(server, (uv_stream_t *)client);
if (ret) {
netdata_log_error("uv_accept(): %s", uv_strerror(ret));
uv_close((uv_handle_t *)client, pipe_close_cb);
return;
}
++clients;
// netdata_log_info("Command Clients = %u", clients);
/* Start parsing a new command */
cmd_ctx->command_string_size = 0;
cmd_ctx->command_string[0] = '\0';
ret = uv_read_start((uv_stream_t*)client, alloc_cb, pipe_read_cb);
if (ret) {
netdata_log_error("uv_read_start(): %s", uv_strerror(ret));
uv_close((uv_handle_t *)client, pipe_close_cb);
--clients;
// netdata_log_info("Command Clients = %u", clients);
return;
}
}
static void async_cb(uv_async_t *handle)
{
uv_stop(handle->loop);
}
static void command_thread(void *arg) {
uv_thread_set_name_np("DAEMON_COMMAND");
int ret;
uv_fs_t req;
(void) arg;
loop = mallocz(sizeof(uv_loop_t));
ret = uv_loop_init(loop);
if (ret) {
netdata_log_error("uv_loop_init(): %s", uv_strerror(ret));
command_thread_error = ret;
goto error_after_loop_init;
}
loop->data = NULL;
ret = uv_async_init(loop, &async, async_cb);
if (ret) {
netdata_log_error("uv_async_init(): %s", uv_strerror(ret));
command_thread_error = ret;
goto error_after_async_init;
}
async.data = NULL;
ret = uv_pipe_init(loop, &server_pipe, 0);
if (ret) {
netdata_log_error("uv_pipe_init(): %s", uv_strerror(ret));
command_thread_error = ret;
goto error_after_pipe_init;
}
const char *pipename = daemon_pipename();
(void)uv_fs_unlink(loop, &req, pipename, NULL);
uv_fs_req_cleanup(&req);
ret = uv_pipe_bind(&server_pipe, pipename);
if (ret) {
netdata_log_error("uv_pipe_bind(): %s", uv_strerror(ret));
command_thread_error = ret;
goto error_after_pipe_bind;
}
ret = uv_listen((uv_stream_t *)&server_pipe, SOMAXCONN, connection_cb);
if (ret) {
/* Fallback to backlog of 1 */
netdata_log_info("uv_listen() failed with backlog = %d, falling back to backlog = 1.", SOMAXCONN);
ret = uv_listen((uv_stream_t *)&server_pipe, 1, connection_cb);
}
if (ret) {
netdata_log_error("uv_listen(): %s", uv_strerror(ret));
command_thread_error = ret;
goto error_after_uv_listen;
}
command_thread_error = 0;
command_thread_shutdown = 0;
/* wake up initialization thread */
completion_mark_complete(&completion);
while (command_thread_shutdown == 0) {
uv_run(loop, UV_RUN_DEFAULT);
}
/* cleanup operations of the event loop */
netdata_log_info("Shutting down command event loop.");
uv_close((uv_handle_t *)&async, NULL);
uv_close((uv_handle_t*)&server_pipe, NULL);
uv_run(loop, UV_RUN_DEFAULT); /* flush all libuv handles */
netdata_log_info("Shutting down command loop complete.");
fatal_assert(0 == uv_loop_close(loop));
freez(loop);
return;
error_after_uv_listen:
error_after_pipe_bind:
uv_close((uv_handle_t*)&server_pipe, NULL);
error_after_pipe_init:
uv_close((uv_handle_t *)&async, NULL);
error_after_async_init:
uv_run(loop, UV_RUN_DEFAULT); /* flush all libuv handles */
fatal_assert(0 == uv_loop_close(loop));
error_after_loop_init:
freez(loop);
/* wake up initialization thread */
completion_mark_complete(&completion);
}
static void sanity_check(void)
{
/* The size of command_info_array must be CMD_TOTAL_COMMANDS elements */
BUILD_BUG_ON(CMD_TOTAL_COMMANDS != sizeof(command_info_array) / sizeof(command_info_array[0]));
}
void commands_init(void)
{
cmd_t i;
int error;
sanity_check();
if (command_server_initialized)
return;
netdata_log_info("Initializing command server.");
for (i = 0 ; i < CMD_TOTAL_COMMANDS ; ++i) {
fatal_assert(0 == uv_mutex_init(&command_lock_array[i]));
}
fatal_assert(0 == uv_rwlock_init(&exclusive_rwlock));
completion_init(&completion);
error = uv_thread_create(&thread, command_thread, NULL);
if (error) {
netdata_log_error("uv_thread_create(): %s", uv_strerror(error));
goto after_error;
}
/* wait for worker thread to initialize */
completion_wait_for(&completion);
completion_destroy(&completion);
if (command_thread_error) {
error = uv_thread_join(&thread);
if (error) {
netdata_log_error("uv_thread_create(): %s", uv_strerror(error));
}
goto after_error;
}
command_server_initialized = 1;
return;
after_error:
netdata_log_error("Failed to initialize command server. The netdata cli tool will be unable to send commands.");
}
void commands_exit(void)
{
cmd_t i;
if (!command_server_initialized)
return;
command_thread_shutdown = 1;
netdata_log_info("Shutting down command server.");
/* wake up event loop */
fatal_assert(0 == uv_async_send(&async));
fatal_assert(0 == uv_thread_join(&thread));
for (i = 0 ; i < CMD_TOTAL_COMMANDS ; ++i) {
uv_mutex_destroy(&command_lock_array[i]);
}
uv_rwlock_destroy(&exclusive_rwlock);
netdata_log_info("Command server has stopped.");
command_server_initialized = 0;
}
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