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Move collecting and flushing telemetry to after final request flush #2555

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Move collecting and flushing telemetry to after final request flush #2555

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2 changes: 2 additions & 0 deletions components-rs/ddtrace.h
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Original file line number Diff line number Diff line change
Expand Up @@ -171,6 +171,8 @@ ddog_MaybeError ddog_sidecar_telemetry_buffer_flush(ddog_SidecarTransport **tran
const ddog_QueueId *queue_id,
struct ddog_SidecarActionsBuffer *buffer);

void ddog_sidecar_telemetry_buffer_drop(struct ddog_SidecarActionsBuffer*);

ddog_MaybeError ddog_sidecar_connect_php(ddog_SidecarTransport **connection,
const char *error_path,
ddog_CharSlice log_level,
Expand Down
4 changes: 4 additions & 0 deletions components-rs/telemetry.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -127,3 +127,7 @@ pub extern "C" fn ddog_sidecar_telemetry_buffer_flush(

MaybeError::None
}

#[no_mangle]
pub extern "C" fn ddog_sidecar_telemetry_buffer_drop(_: Box<SidecarActionsBuffer>) {
}
109 changes: 92 additions & 17 deletions ext/ddtrace.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1017,6 +1017,8 @@ static void dd_disable_if_incompatible_sapi_detected(void) {
}
}

static void dd_post_sapi_deactivate_minit(void);

static PHP_MINIT_FUNCTION(ddtrace) {
UNUSED(type);

Expand All @@ -1042,6 +1044,7 @@ static PHP_MINIT_FUNCTION(ddtrace) {
#if ZAI_JIT_BLACKLIST_ACTIVE
zai_jit_minit();
#endif
dd_post_sapi_deactivate_minit();
#if PHP_VERSION_ID >= 80100
ddtrace_setup_fiber_observers();
#endif
Expand Down Expand Up @@ -1374,13 +1377,6 @@ void dd_force_shutdown_tracing(void) {
DDTRACE_G(in_shutdown) = false;
}

static void dd_finalize_telemetry(void) {
if (DDTRACE_G(telemetry_queue_id)) {
ddtrace_telemetry_finalize();
DDTRACE_G(telemetry_queue_id) = 0;
}
}

static PHP_RSHUTDOWN_FUNCTION(ddtrace) {
UNUSED(module_number, type);

Expand All @@ -1401,7 +1397,19 @@ static PHP_RSHUTDOWN_FUNCTION(ddtrace) {
DDTRACE_G(active_stack) = NULL;
}

dd_finalize_telemetry();
if (DDTRACE_G(telemetry_queue_id)) {
ddtrace_telemetry_collect_config();
}

return SUCCESS;
}

static void dd_post_sapi_deactivate_do(void) {
if (DDTRACE_G(telemetry_queue_id)) {
ddtrace_telemetry_finalize();
DDTRACE_G(telemetry_queue_id) = 0;
}

if (DDTRACE_G(last_flushed_root_service_name)) {
zend_string_release(DDTRACE_G(last_flushed_root_service_name));
DDTRACE_G(last_flushed_root_service_name) = NULL;
Expand All @@ -1411,23 +1419,86 @@ static PHP_RSHUTDOWN_FUNCTION(ddtrace) {
DDTRACE_G(last_flushed_root_env_name) = NULL;
}

return SUCCESS;
zai_interceptor_deactivate();

// we can only actually free our hooks hashtables in post_deactivate or later, as within RSHUTDOWN some user code may still run
zai_hook_rshutdown();
zai_uhook_rshutdown();

// zai config may be accessed indirectly via other modules RSHUTDOWN, so delay this until the last possible time
zai_config_rshutdown();
}

#if PHP_VERSION_ID < 80000
int ddtrace_post_deactivate(void) {
#else
zend_result ddtrace_post_deactivate(void) {
#endif
zai_interceptor_deactivate();
if (sapi_module.deactivate == NULL) { // e.g. in preloading
dd_post_sapi_deactivate_do();
}
return SUCCESS;
}

// we can only actually free our hooks hashtables in post_deactivate, as within RSHUTDOWN some user code may still run
zai_hook_rshutdown();
zai_uhook_rshutdown();
static int (*dd_prev_sapi_deactivate)(void);

// zai config may be accessed indirectly via other modules RSHUTDOWN, so delay this until the last possible time
zai_config_rshutdown();
return SUCCESS;
// Start of request_rec from httpd.h, this has been unchanged forever, so we can just use this.
struct apache_request_rec {
void *pool;
void *connection;
void *server;
void *next;
void *prev;
void *main;
};
static void (*dd_ap_finalize_request_protocol)(struct apache_request_rec *r);

static int dd_post_apache_deactivate(void) {
int result = dd_prev_sapi_deactivate ? dd_prev_sapi_deactivate() : SUCCESS;

if (SG(sapi_started)) {
struct apache_request_rec *r = ((struct {
int state;
struct apache_request_rec *r;
} *) SG(server_context))->r;
// Check whether this is not an apache sub-request, otherwise we may not alter the state of the connection, i.e. here we don't gain any latency benefit
if (!r->main) {
dd_ap_finalize_request_protocol(r);
}

dd_post_sapi_deactivate_do();
}

return result;
}

static int dd_post_sapi_deactivate(void) {
int result = dd_prev_sapi_deactivate ? dd_prev_sapi_deactivate() : SUCCESS;
if (SG(sapi_started)) { // only if a proper request happened; it's also called during minit
dd_post_sapi_deactivate_do();
}
return result;
}

static void dd_post_sapi_deactivate_minit(void) {
dd_prev_sapi_deactivate = sapi_module.deactivate;

if (!ddtrace_disable && ddtrace_active_sapi == DATADOG_PHP_SAPI_APACHE2HANDLER) {
#ifndef _WIN32
void *handle = dlopen(NULL, RTLD_LAZY);
#else
void *handle = GetModuleHandle(NULL); // not refcounted, must not be closed
#endif
dd_ap_finalize_request_protocol = DL_FETCH_SYMBOL(handle, "ap_finalize_request_protocol");
#ifndef _WIN32
dlclose(handle);
#endif
if (dd_ap_finalize_request_protocol) {
sapi_module.deactivate = dd_post_apache_deactivate;
return;
}
}
sapi_module.deactivate = dd_post_sapi_deactivate;
}

void ddtrace_disable_tracing_in_current_request(void) {
Expand Down Expand Up @@ -2056,7 +2127,11 @@ PHP_FUNCTION(dd_trace_internal_fn) {
RETVAL_FALSE;
if (ZSTR_LEN(function_val) > 0) {
if (FUNCTION_NAME_MATCHES("finalize_telemetry")) {
dd_finalize_telemetry();
if (DDTRACE_G(telemetry_queue_id)) {
ddtrace_telemetry_collect_config();
ddtrace_telemetry_finalize();
DDTRACE_G(telemetry_queue_id) = 0;
}
RETVAL_TRUE;
} else if (params_count == 1 && FUNCTION_NAME_MATCHES("detect_composer_installed_json")) {
ddog_CharSlice path = dd_zend_string_to_CharSlice(Z_STR_P(ZVAL_VARARG_PARAM(params, 0)));
Expand Down
1 change: 1 addition & 0 deletions ext/ddtrace.h
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Expand Up @@ -101,6 +101,7 @@ ZEND_BEGIN_MODULE_GLOBALS(ddtrace)

char *cgroup_file;
ddog_QueueId telemetry_queue_id;
ddog_SidecarActionsBuffer *telemetry_buffer;
ddog_AgentRemoteConfigReader *remote_config_reader;
HashTable *agent_rate_by_service;
zend_string *last_flushed_root_service_name;
Expand Down
42 changes: 30 additions & 12 deletions ext/telemetry.c
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Original file line number Diff line number Diff line change
Expand Up @@ -25,23 +25,16 @@ void ddtrace_telemetry_first_init(void) {
dd_composer_hook_id = zai_hook_install((zai_str)ZAI_STR_EMPTY, (zai_str)ZAI_STR_EMPTY, dd_check_for_composer_autoloader, NULL, ZAI_HOOK_AUX_UNUSED, 0);
}

void ddtrace_telemetry_finalize(void) {
void ddtrace_telemetry_collect_config(void) {
if (!ddtrace_sidecar || !get_global_DD_INSTRUMENTATION_TELEMETRY_ENABLED()) {
return;
}

ddog_SidecarActionsBuffer *buffer = ddog_sidecar_telemetry_buffer_alloc();
if (DDTRACE_G(telemetry_buffer)) {
ddog_sidecar_telemetry_buffer_drop(DDTRACE_G(telemetry_buffer));
}

zend_module_entry *module;
char module_name[261] = { 'e', 'x', 't', '-' };
ZEND_HASH_FOREACH_PTR(&module_registry, module) {
size_t namelen = strlen(module->name);
memcpy(module_name + 4, module->name, MIN(256, strlen(module->name)));
const char *version = module->version ? module->version : "";
ddog_sidecar_telemetry_addDependency_buffer(buffer,
(ddog_CharSlice) {.len = namelen + 4, .ptr = module_name},
(ddog_CharSlice) {.len = strlen(version), .ptr = version});
} ZEND_HASH_FOREACH_END();
ddog_SidecarActionsBuffer *buffer = DDTRACE_G(telemetry_buffer) = ddog_sidecar_telemetry_buffer_alloc();

for (uint8_t i = 0; i < zai_config_memoized_entries_count; i++) {
zai_config_memoized_entry *cfg = &zai_config_memoized_entries[i];
Expand Down Expand Up @@ -69,6 +62,31 @@ void ddtrace_telemetry_finalize(void) {
ddog_sidecar_telemetry_addIntegration_buffer(buffer, integration_name, (ddog_CharSlice)DDOG_CHARSLICE_C(""), false);
}
}
}

void ddtrace_telemetry_finalize(void) {
if (!ddtrace_sidecar || !get_global_DD_INSTRUMENTATION_TELEMETRY_ENABLED()) {
return;
}

ddog_SidecarActionsBuffer *buffer = DDTRACE_G(telemetry_buffer);
if (buffer) {
DDTRACE_G(telemetry_buffer) = NULL;
} else {
buffer = ddog_sidecar_telemetry_buffer_alloc();
}

zend_module_entry *module;
char module_name[261] = { 'e', 'x', 't', '-' };
ZEND_HASH_FOREACH_PTR(&module_registry, module) {
size_t namelen = strlen(module->name);
memcpy(module_name + 4, module->name, MIN(256, strlen(module->name)));
const char *version = module->version ? module->version : "";
ddog_sidecar_telemetry_addDependency_buffer(buffer,
(ddog_CharSlice) {.len = namelen + 4, .ptr = module_name},
(ddog_CharSlice) {.len = strlen(version), .ptr = version});
} ZEND_HASH_FOREACH_END();

ddog_sidecar_telemetry_buffer_flush(&ddtrace_sidecar, ddtrace_sidecar_instance_id, &DDTRACE_G(telemetry_queue_id), buffer);

ddog_CharSlice service_name = DDOG_CHARSLICE_C("unnamed-php-service");
Expand Down
1 change: 1 addition & 0 deletions ext/telemetry.h
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Expand Up @@ -6,6 +6,7 @@
void ddtrace_telemetry_first_init(void);
ddog_TelemetryWorkerHandle *ddtrace_build_telemetry_handle(void);
void ddtrace_telemetry_notify_integration(const char *name, size_t name_len);
void ddtrace_telemetry_collect_config(void);
void ddtrace_telemetry_finalize(void);

#endif // DDTRACE_TELEMETRY_H
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