Collect agent info and apply the env for remote config

Makefile

@@ -45,7 +45,7 @@ RUN_TESTS_CMD := REPORT_EXIT_STATUS=1 TEST_PHP_SRCDIR=$(PROJECT_ROOT) USE_TRACKE
 
 C_FILES = $(shell find components components-rs ext src/dogstatsd zend_abstract_interface -name '*.c' -o -name '*.h' | awk '{ printf "$(BUILD_DIR)/%s\n", $$1 }' )
 TEST_FILES = $(shell find tests/ext -name '*.php*' -o -name '*.inc' -o -name '*.json' -o -name 'CONFLICTS' | awk '{ printf "$(BUILD_DIR)/%s\n", $$1 }' )
-RUST_FILES = $(BUILD_DIR)/Cargo.toml $(BUILD_DIR)/Cargo.lock $(shell find components-rs -name '*.c' -o -name '*.rs' -o -name 'Cargo.toml' | awk '{ printf "$(BUILD_DIR)/%s\n", $$1 }' ) $(shell find libdatadog/{alloc,build-common,crashtracker,crashtracker-ffi,ddcommon,ddcommon-ffi,ddsketch,ddtelemetry,ddtelemetry-ffi,dogstatsd-client,dynamic-configuration,ipc,live-debugger,live-debugger-ffi,remote-config,sidecar,sidecar-ffi,spawn_worker,tinybytes,tools/{cc_utils,sidecar_mockgen},trace-*,Cargo.toml} -type f \( -path "*/src*" -o -path "*/examples*" -o -path "*Cargo.toml" -o -path "*/build.rs" -o -path "*/tests/dataservice.rs" -o -path "*/tests/service_functional.rs" \) -not -path "*/ipc/build.rs" -not -path "*/sidecar-ffi/build.rs")
+RUST_FILES = $(BUILD_DIR)/Cargo.toml $(BUILD_DIR)/Cargo.lock $(shell find components-rs -name '*.c' -o -name '*.rs' -o -name 'Cargo.toml' | awk '{ printf "$(BUILD_DIR)/%s\n", $$1 }' ) $(shell find libdatadog/{alloc,build-common,crashtracker,crashtracker-ffi,data-pipeline,ddcommon,ddcommon-ffi,ddsketch,ddtelemetry,ddtelemetry-ffi,dogstatsd-client,dynamic-configuration,ipc,live-debugger,live-debugger-ffi,remote-config,sidecar,sidecar-ffi,spawn_worker,tinybytes,tools/{cc_utils,sidecar_mockgen},trace-*,Cargo.toml} -type f \( -path "*/src*" -o -path "*/examples*" -o -path "*Cargo.toml" -o -path "*/build.rs" -o -path "*/tests/dataservice.rs" -o -path "*/tests/service_functional.rs" \) -not -path "*/ipc/build.rs" -not -path "*/sidecar-ffi/build.rs")
 ALL_OBJECT_FILES = $(C_FILES) $(RUST_FILES) $(BUILD_DIR)/Makefile
 TEST_OPCACHE_FILES = $(shell find tests/opcache -name '*.php*' -o -name '.gitkeep' | awk '{ printf "$(BUILD_DIR)/%s\n", $$1 }' )
 TEST_STUB_FILES = $(shell find tests/ext -type d -name 'stubs' -exec find '{}' -type f \; | awk '{ printf "$(BUILD_DIR)/%s\n", $$1 }' )

components-rs/common.h

@@ -821,6 +821,8 @@ typedef struct ddog_ContextKey {
   enum ddog_MetricType _1;
 } ddog_ContextKey;
 
+typedef struct ddog_AgentInfoReader ddog_AgentInfoReader;
+
 typedef struct ddog_AgentRemoteConfigReader ddog_AgentRemoteConfigReader;
 
 typedef struct ddog_AgentRemoteConfigWriter_ShmHandle ddog_AgentRemoteConfigWriter_ShmHandle;
@@ -957,14 +959,23 @@ typedef struct ddog_crasht_Slice_CharSlice {
 typedef struct ddog_crasht_Config {
   struct ddog_crasht_Slice_CharSlice additional_files;
   bool create_alt_stack;
+  bool use_alt_stack;
   /**
    * The endpoint to send the crash report to (can be a file://).
    * If None, the crashtracker will infer the agent host from env variables.
    */
   const struct ddog_Endpoint *endpoint;
   enum ddog_crasht_StacktraceCollection resolve_frames;
-  uint64_t timeout_secs;
-  bool wait_for_receiver;
+  /**
+   * Timeout in milliseconds before the signal handler starts tearing things down to return.
+   * This is given as a uint32_t, but the actual timeout needs to fit inside of an i32 (max
+   * 2^31-1). This is a limitation of the various interfaces used to guarantee the timeout.
+   */
+  uint32_t timeout_ms;
+  /**
+   * Optional filename for a unix domain socket if the receiver is used asynchonously
+   */
+  ddog_CharSlice optional_unix_socket_filename;
 } ddog_crasht_Config;
 
 typedef struct ddog_crasht_EnvVar {

components-rs/crashtracker.h

@@ -39,8 +39,7 @@ DDOG_CHECK_RETURN struct ddog_crasht_Result ddog_crasht_shutdown(void);
  * Reinitialize the crash-tracking infrastructure after a fork.
  * This should be one of the first things done after a fork, to minimize the
  * chance that a crash occurs between the fork, and this call.
- * In particular, reset the counters that track the profiler state machine,
- * and start a new receiver to collect data from this fork.
+ * In particular, reset the counters that track the profiler state machine.
  * NOTE: An alternative design would be to have a 1:many sidecar listening on a
  * socket instead of 1:1 receiver listening on a pipe, but the only real
  * advantage would be to have fewer processes in `ps -a`.
@@ -73,15 +72,15 @@ struct ddog_crasht_Result ddog_crasht_update_on_fork(struct ddog_crasht_Config c
  *   unexpected crash-handling behaviour.
  */
 DDOG_CHECK_RETURN
-struct ddog_crasht_Result ddog_crasht_init_with_receiver(struct ddog_crasht_Config config,
-                                                         struct ddog_crasht_ReceiverConfig receiver_config,
-                                                         struct ddog_crasht_Metadata metadata);
+struct ddog_crasht_Result ddog_crasht_init(struct ddog_crasht_Config config,
+                                           struct ddog_crasht_ReceiverConfig receiver_config,
+                                           struct ddog_crasht_Metadata metadata);
 
 /**
- * Initialize the crash-tracking infrastructure, writing to an unix socket in case of crash.
+ * Initialize the crash-tracking infrastructure without launching the receiver.
  *
  * # Preconditions
- *   None.
+ *   Requires `config` to be given with a `unix_socket_path`, which is normally optional.
  * # Safety
  *   Crash-tracking functions are not reentrant.
  *   No other crash-handler functions should be called concurrently.
@@ -90,8 +89,7 @@ struct ddog_crasht_Result ddog_crasht_init_with_receiver(struct ddog_crasht_Conf
  *   unexpected crash-handling behaviour.
  */
 DDOG_CHECK_RETURN
-struct ddog_crasht_Result ddog_crasht_init_with_unix_socket(struct ddog_crasht_Config config,
-                                                            ddog_CharSlice socket_path,
+struct ddog_crasht_Result ddog_crasht_init_without_receiver(struct ddog_crasht_Config config,
                                                             struct ddog_crasht_Metadata metadata);
 
 /**

components-rs/sidecar.h

@@ -33,6 +33,10 @@ void ddog_ph_file_drop(struct ddog_NativeFile ph);
 
 ddog_MaybeError ddog_alloc_anon_shm_handle(uintptr_t size, struct ddog_ShmHandle **handle);
 
+ddog_MaybeError ddog_alloc_anon_shm_handle_named(uintptr_t size,
+                                                 struct ddog_ShmHandle **handle,
+                                                 ddog_CharSlice name);
+
 ddog_MaybeError ddog_map_shm(struct ddog_ShmHandle *handle,
                              struct ddog_MappedMem_ShmHandle **mapped,
                              void **pointer,
@@ -306,4 +310,19 @@ void ddog_sidecar_reconnect(struct ddog_SidecarTransport **transport,
  */
 ddog_CharSlice ddog_sidecar_get_crashtracker_unix_socket_path(void);
 
+/**
+ * Gets an agent info reader.
+ */
+struct ddog_AgentInfoReader *ddog_get_agent_info_reader(const struct ddog_Endpoint *endpoint);
+
+/**
+ * Gets the current agent info environment (or empty if not existing)
+ */
+ddog_CharSlice ddog_get_agent_info_env(struct ddog_AgentInfoReader *reader, bool *changed);
+
+/**
+ * Drops the agent info reader.
+ */
+void ddog_drop_agent_info_reader(struct ddog_AgentInfoReader*);
+
 #endif /* DDOG_SIDECAR_H */

config.m4

@@ -162,6 +162,7 @@ if test "$PHP_DDTRACE" != "no"; then
   dnl ddtrace.c comes first, then everything else alphabetically
   DD_TRACE_PHP_SOURCES="$EXTRA_PHP_SOURCES \
     ext/ddtrace.c \
+    ext/agent_info.c \
     ext/arrays.c \
     ext/auto_flush.c \
     ext/autoload_php_files.c \

config.w32

@@ -15,7 +15,8 @@ if (PHP_DDTRACE != 'no') {
 
 	var version = PHP_VERSION * 100 + PHP_MINOR_VERSION;
 
-	var DDTRACE_EXT_SOURCES = "arrays.c";
+	var DDTRACE_EXT_SOURCES = "agent_info.c";
+	DDTRACE_EXT_SOURCES += " arrays.c";
 	DDTRACE_EXT_SOURCES += " auto_flush.c";
 	DDTRACE_EXT_SOURCES += " autoload_php_files.c";
 	DDTRACE_EXT_SOURCES += " collect_backtrace.c";

dockerfiles/services/request-replayer/src/index.php

@@ -78,6 +78,7 @@ function decodeDogStatsDMetrics($metrics)
 define('REQUEST_RC_CONFIGS_FILE', getenv('REQUEST_RC_CONFIGS_FILE') ?: ("$temp_location/rc_configs.json"));
 define('REQUEST_METRICS_FILE', getenv('REQUEST_METRICS_FILE') ?: ("$temp_location/metrics.json"));
 define('REQUEST_METRICS_LOG_FILE', getenv('REQUEST_METRICS_LOG_FILE') ?: ("$temp_location/metrics-log.txt"));
+define('REQUEST_AGENT_INFO_FILE', getenv('REQUEST_AGENT_INFO_FILE') ?: ("$temp_location/agent-info.txt"));
 
 function logRequest($message, $data = '')
 {
@@ -91,8 +92,8 @@ function logRequest($message, $data = '')
 }
 
 set_error_handler(function ($number, $message, $errfile, $errline) {
-    if (error_reporting() == 0) {
-        return;
+    if (!($number & error_reporting())) {
+        return true;
     }
     logRequest("Triggered error $number $message in $errfile on line $errline: " . (new \Exception)->getTraceAsString());
     trigger_error($message, $number);
@@ -142,6 +143,9 @@ function logRequest($message, $data = '')
         if (file_exists(REQUEST_NEXT_RESPONSE_FILE)) {
             unlink(REQUEST_NEXT_RESPONSE_FILE);
         }
+        if (file_exists(REQUEST_AGENT_INFO_FILE)) {
+            unlink(REQUEST_AGENT_INFO_FILE);
+        }
         logRequest('Deleted request log');
         break;
     case '/next-response':
@@ -214,6 +218,16 @@ function logRequest($message, $data = '')
             file_put_contents(REQUEST_METRICS_FILE, json_encode($allMetrics));
         }
         break;
+    case '/set-agent-info':
+        $raw = file_get_contents('php://input');
+        file_put_contents(REQUEST_AGENT_INFO_FILE, $raw);
+        break;
+    case '/info':
+        $file = @file_get_contents(REQUEST_AGENT_INFO_FILE) ?: "{}";
+        logRequest('Requested /info endpoint, returning ' . $file);
+        header("datadog-agent-state: " . sha1($file));
+        echo $file;
+        break;
     default:
         $headers = getallheaders();
         if (isset($headers['X-Datadog-Diagnostic-Check']) || isset($headers['x-datadog-diagnostic-check'])) {