libstats/socket/stats_event.c - third_party/android/platform/system/core - Git at Google

 /*
  * Copyright (C) 2019 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
  *
  *      http://www.apache.org/licenses/LICENSE-2.0
  *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  * See the License for the specific language governing permissions and
  * limitations under the License.
  */

 #include "include/stats_event.h"
 #include <stdlib.h>
 #include <string.h>
 #include <time.h>
 #include "stats_buffer_writer.h"

 #define LOGGER_ENTRY_MAX_PAYLOAD 4068
 // Max payload size is 4 bytes less as 4 bytes are reserved for stats_eventTag.
 // See android_util_Stats_Log.cpp
 #define MAX_EVENT_PAYLOAD (LOGGER_ENTRY_MAX_PAYLOAD - 4)

 /* POSITIONS */
 #define POS_NUM_ELEMENTS 1
 #define POS_TIMESTAMP (POS_NUM_ELEMENTS + sizeof(uint8_t))
 #define POS_ATOM_ID (POS_TIMESTAMP + sizeof(uint8_t) + sizeof(uint64_t))
 #define POS_FIRST_FIELD (POS_ATOM_ID + sizeof(uint8_t) + sizeof(uint32_t))

 /* LIMITS */
 #define MAX_ANNOTATION_COUNT 15
 #define MAX_BYTE_VALUE 127  // parsing side requires that lengths fit in 7 bits

 // The stats_event struct holds the serialized encoding of an event
 // within a buf. Also includes other required fields.
 struct stats_event {
     uint8_t* buf;
     size_t lastFieldPos;  // location of last field within the buf
     size_t size;          // number of valid bytes within buffer
     uint32_t numElements;
     uint32_t atomId;
     uint32_t errors;
     bool truncate;
     bool built;
 };

 static int64_t get_elapsed_realtime_ns() {
     struct timespec t;
     t.tv_sec = t.tv_nsec = 0;
     clock_gettime(CLOCK_BOOTTIME, &t);
     return (int64_t)t.tv_sec * 1000000000LL + t.tv_nsec;
 }

 struct stats_event* stats_event_obtain() {
     struct stats_event* event = malloc(sizeof(struct stats_event));
     event->buf = (uint8_t*)calloc(MAX_EVENT_PAYLOAD, 1);
     event->buf[0] = OBJECT_TYPE;
     event->atomId = 0;
     event->errors = 0;
     event->truncate = true;  // truncate for both pulled and pushed atoms
     event->built = false;

     // place the timestamp
     uint64_t timestampNs = get_elapsed_realtime_ns();
     event->buf[POS_TIMESTAMP] = INT64_TYPE;
     memcpy(&event->buf[POS_TIMESTAMP + sizeof(uint8_t)], &timestampNs, sizeof(timestampNs));

     event->numElements = 1;
     event->lastFieldPos = 0;  // 0 since we haven't written a field yet
     event->size = POS_FIRST_FIELD;

     return event;
 }

 void stats_event_release(struct stats_event* event) {
     free(event->buf);
     free(event);
 }

 void stats_event_set_atom_id(struct stats_event* event, uint32_t atomId) {
     event->atomId = atomId;
     event->buf[POS_ATOM_ID] = INT32_TYPE;
     memcpy(&event->buf[POS_ATOM_ID + sizeof(uint8_t)], &atomId, sizeof(atomId));
     event->numElements++;
 }

 // Side-effect: modifies event->errors if the buffer would overflow
 static bool overflows(struct stats_event* event, size_t size) {
     if (event->size + size > MAX_EVENT_PAYLOAD) {
         event->errors |= ERROR_OVERFLOW;
         return true;
     }
     return false;
 }

 // Side-effect: all append functions increment event->size if there is
 // sufficient space within the buffer to place the value
 static void append_byte(struct stats_event* event, uint8_t value) {
     if (!overflows(event, sizeof(value))) {
         event->buf[event->size] = value;
         event->size += sizeof(value);
     }
 }

 static void append_bool(struct stats_event* event, bool value) {
     append_byte(event, (uint8_t)value);
 }

 static void append_int32(struct stats_event* event, int32_t value) {
     if (!overflows(event, sizeof(value))) {
         memcpy(&event->buf[event->size], &value, sizeof(value));
         event->size += sizeof(value);
     }
 }

 static void append_int64(struct stats_event* event, int64_t value) {
     if (!overflows(event, sizeof(value))) {
         memcpy(&event->buf[event->size], &value, sizeof(value));
         event->size += sizeof(value);
     }
 }

 static void append_float(struct stats_event* event, float value) {
     if (!overflows(event, sizeof(value))) {
         memcpy(&event->buf[event->size], &value, sizeof(value));
         event->size += sizeof(float);
     }
 }

 static void append_byte_array(struct stats_event* event, const uint8_t* buf, size_t size) {
     if (!overflows(event, size)) {
         memcpy(&event->buf[event->size], buf, size);
         event->size += size;
     }
 }

 // Side-effect: modifies event->errors if buf is not properly null-terminated
 static void append_string(struct stats_event* event, const char* buf) {
     size_t size = strnlen(buf, MAX_EVENT_PAYLOAD);
     if (size == MAX_EVENT_PAYLOAD) {
         event->errors |= ERROR_STRING_NOT_NULL_TERMINATED;
         return;
     }

     append_int32(event, size);
     append_byte_array(event, (uint8_t*)buf, size);
 }

 static void start_field(struct stats_event* event, uint8_t typeId) {
     event->lastFieldPos = event->size;
     append_byte(event, typeId);
     event->numElements++;
 }

 void stats_event_write_int32(struct stats_event* event, int32_t value) {
     if (event->errors) return;

     start_field(event, INT32_TYPE);
     append_int32(event, value);
 }

 void stats_event_write_int64(struct stats_event* event, int64_t value) {
     if (event->errors) return;

     start_field(event, INT64_TYPE);
     append_int64(event, value);
 }

 void stats_event_write_float(struct stats_event* event, float value) {
     if (event->errors) return;

     start_field(event, FLOAT_TYPE);
     append_float(event, value);
 }

 void stats_event_write_bool(struct stats_event* event, bool value) {
     if (event->errors) return;

     start_field(event, BOOL_TYPE);
     append_bool(event, value);
 }

 void stats_event_write_byte_array(struct stats_event* event, const uint8_t* buf, size_t numBytes) {
     if (event->errors) return;

     start_field(event, BYTE_ARRAY_TYPE);
     append_int32(event, numBytes);
     append_byte_array(event, buf, numBytes);
 }

 // Value is assumed to be encoded using UTF8
 void stats_event_write_string8(struct stats_event* event, const char* value) {
     if (event->errors) return;

     start_field(event, STRING_TYPE);
     append_string(event, value);
 }

 // Tags are assumed to be encoded using UTF8
 void stats_event_write_attribution_chain(struct stats_event* event, const uint32_t* uids,
                                          const char* const* tags, uint8_t numNodes) {
     if (numNodes > MAX_BYTE_VALUE) event->errors |= ERROR_ATTRIBUTION_CHAIN_TOO_LONG;
     if (event->errors) return;

     start_field(event, ATTRIBUTION_CHAIN_TYPE);
     append_byte(event, numNodes);

     for (uint8_t i = 0; i < numNodes; i++) {
         append_int32(event, uids[i]);
         append_string(event, tags[i]);
     }
 }

 void stats_event_write_key_value_pairs(struct stats_event* event, struct key_value_pair* pairs,
                                        uint8_t numPairs) {
     if (numPairs > MAX_BYTE_VALUE) event->errors |= ERROR_TOO_MANY_KEY_VALUE_PAIRS;
     if (event->errors) return;

     start_field(event, KEY_VALUE_PAIRS_TYPE);
     append_byte(event, numPairs);

     for (uint8_t i = 0; i < numPairs; i++) {
         append_int32(event, pairs[i].key);
         append_byte(event, pairs[i].valueType);
         switch (pairs[i].valueType) {
             case INT32_TYPE:
                 append_int32(event, pairs[i].int32Value);
                 break;
             case INT64_TYPE:
                 append_int64(event, pairs[i].int64Value);
                 break;
             case FLOAT_TYPE:
                 append_float(event, pairs[i].floatValue);
                 break;
             case STRING_TYPE:
                 append_string(event, pairs[i].stringValue);
                 break;
             default:
                 event->errors |= ERROR_INVALID_VALUE_TYPE;
                 return;
         }
     }
 }

 // Side-effect: modifies event->errors if field has too many annotations
 static void increment_annotation_count(struct stats_event* event) {
     uint8_t fieldType = event->buf[event->lastFieldPos] & 0x0F;
     uint32_t oldAnnotationCount = (event->buf[event->lastFieldPos] & 0xF0) >> 4;
     uint32_t newAnnotationCount = oldAnnotationCount + 1;

     if (newAnnotationCount > MAX_ANNOTATION_COUNT) {
         event->errors |= ERROR_TOO_MANY_ANNOTATIONS;
         return;
     }

     event->buf[event->lastFieldPos] = (((uint8_t)newAnnotationCount << 4) & 0xF0) | fieldType;
 }

 void stats_event_add_bool_annotation(struct stats_event* event, uint8_t annotationId, bool value) {
     if (event->lastFieldPos == 0) event->errors |= ERROR_ANNOTATION_DOES_NOT_FOLLOW_FIELD;
     if (annotationId > MAX_BYTE_VALUE) event->errors |= ERROR_ANNOTATION_ID_TOO_LARGE;
     if (event->errors) return;

     append_byte(event, annotationId);
     append_byte(event, BOOL_TYPE);
     append_bool(event, value);
     increment_annotation_count(event);
 }

 void stats_event_add_int32_annotation(struct stats_event* event, uint8_t annotationId,
                                       int32_t value) {
     if (event->lastFieldPos == 0) event->errors |= ERROR_ANNOTATION_DOES_NOT_FOLLOW_FIELD;
     if (annotationId > MAX_BYTE_VALUE) event->errors |= ERROR_ANNOTATION_ID_TOO_LARGE;
     if (event->errors) return;

     append_byte(event, annotationId);
     append_byte(event, INT32_TYPE);
     append_int32(event, value);
     increment_annotation_count(event);
 }

 uint32_t stats_event_get_atom_id(struct stats_event* event) {
     return event->atomId;
 }

 uint8_t* stats_event_get_buffer(struct stats_event* event, size_t* size) {
     if (size) *size = event->size;
     return event->buf;
 }

 uint32_t stats_event_get_errors(struct stats_event* event) {
     return event->errors;
 }

 void stats_event_truncate_buffer(struct stats_event* event, bool truncate) {
     event->truncate = truncate;
 }

 void stats_event_build(struct stats_event* event) {
     if (event->built) return;

     if (event->atomId == 0) event->errors |= ERROR_NO_ATOM_ID;

     if (event->numElements > MAX_BYTE_VALUE) {
         event->errors |= ERROR_TOO_MANY_FIELDS;
     } else {
         event->buf[POS_NUM_ELEMENTS] = event->numElements;
     }

     // If there are errors, rewrite buffer.
     if (event->errors) {
         event->buf[POS_NUM_ELEMENTS] = 3;
         event->buf[POS_FIRST_FIELD] = ERROR_TYPE;
         memcpy(&event->buf[POS_FIRST_FIELD + sizeof(uint8_t)], &event->errors,
                sizeof(event->errors));
         event->size = POS_FIRST_FIELD + sizeof(uint8_t) + sizeof(uint32_t);
     }

     // Truncate the buffer to the appropriate length in order to limit our
     // memory usage.
     if (event->truncate) event->buf = (uint8_t*)realloc(event->buf, event->size);

     event->built = true;
 }

 int stats_event_write(struct stats_event* event) {
     stats_event_build(event);
     return write_buffer_to_statsd(&event->buf, event->size, event->atomId);
 }

 struct stats_event_api_table table = {
         stats_event_obtain,
         stats_event_build,
         stats_event_write,
         stats_event_release,
         stats_event_set_atom_id,
         stats_event_write_int32,
         stats_event_write_int64,
         stats_event_write_float,
         stats_event_write_bool,
         stats_event_write_byte_array,
         stats_event_write_string8,
         stats_event_write_attribution_chain,
         stats_event_write_key_value_pairs,
         stats_event_add_bool_annotation,
         stats_event_add_int32_annotation,
         stats_event_get_atom_id,
         stats_event_get_buffer,
         stats_event_get_errors,
 };
	/*
	* Copyright (C) 2019 The Android Open Source Project
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	#include "include/stats_event.h"
	#include <stdlib.h>
	#include <string.h>
	#include <time.h>
	#include "stats_buffer_writer.h"

	#define LOGGER_ENTRY_MAX_PAYLOAD 4068
	// Max payload size is 4 bytes less as 4 bytes are reserved for stats_eventTag.
	// See android_util_Stats_Log.cpp
	#define MAX_EVENT_PAYLOAD (LOGGER_ENTRY_MAX_PAYLOAD - 4)

	/* POSITIONS */
	#define POS_NUM_ELEMENTS 1
	#define POS_TIMESTAMP (POS_NUM_ELEMENTS + sizeof(uint8_t))
	#define POS_ATOM_ID (POS_TIMESTAMP + sizeof(uint8_t) + sizeof(uint64_t))
	#define POS_FIRST_FIELD (POS_ATOM_ID + sizeof(uint8_t) + sizeof(uint32_t))

	/* LIMITS */
	#define MAX_ANNOTATION_COUNT 15
	#define MAX_BYTE_VALUE 127 // parsing side requires that lengths fit in 7 bits

	// The stats_event struct holds the serialized encoding of an event
	// within a buf. Also includes other required fields.
	struct stats_event {
	uint8_t* buf;
	size_t lastFieldPos; // location of last field within the buf
	size_t size; // number of valid bytes within buffer
	uint32_t numElements;
	uint32_t atomId;
	uint32_t errors;
	bool truncate;
	bool built;
	};

	static int64_t get_elapsed_realtime_ns() {
	struct timespec t;
	t.tv_sec = t.tv_nsec = 0;
	clock_gettime(CLOCK_BOOTTIME, &t);
	return (int64_t)t.tv_sec * 1000000000LL + t.tv_nsec;
	}

	struct stats_event* stats_event_obtain() {
	struct stats_event* event = malloc(sizeof(struct stats_event));
	event->buf = (uint8_t*)calloc(MAX_EVENT_PAYLOAD, 1);
	event->buf[0] = OBJECT_TYPE;
	event->atomId = 0;
	event->errors = 0;
	event->truncate = true; // truncate for both pulled and pushed atoms
	event->built = false;

	// place the timestamp
	uint64_t timestampNs = get_elapsed_realtime_ns();
	event->buf[POS_TIMESTAMP] = INT64_TYPE;
	memcpy(&event->buf[POS_TIMESTAMP + sizeof(uint8_t)], &timestampNs, sizeof(timestampNs));

	event->numElements = 1;
	event->lastFieldPos = 0; // 0 since we haven't written a field yet
	event->size = POS_FIRST_FIELD;

	return event;
	}

	void stats_event_release(struct stats_event* event) {
	free(event->buf);
	free(event);
	}

	void stats_event_set_atom_id(struct stats_event* event, uint32_t atomId) {
	event->atomId = atomId;
	event->buf[POS_ATOM_ID] = INT32_TYPE;
	memcpy(&event->buf[POS_ATOM_ID + sizeof(uint8_t)], &atomId, sizeof(atomId));
	event->numElements++;
	}

	// Side-effect: modifies event->errors if the buffer would overflow
	static bool overflows(struct stats_event* event, size_t size) {
	if (event->size + size > MAX_EVENT_PAYLOAD) {
	event->errors \|= ERROR_OVERFLOW;
	return true;
	}
	return false;
	}

	// Side-effect: all append functions increment event->size if there is
	// sufficient space within the buffer to place the value
	static void append_byte(struct stats_event* event, uint8_t value) {
	if (!overflows(event, sizeof(value))) {
	event->buf[event->size] = value;
	event->size += sizeof(value);
	}
	}

	static void append_bool(struct stats_event* event, bool value) {
	append_byte(event, (uint8_t)value);
	}

	static void append_int32(struct stats_event* event, int32_t value) {
	if (!overflows(event, sizeof(value))) {
	memcpy(&event->buf[event->size], &value, sizeof(value));
	event->size += sizeof(value);
	}
	}

	static void append_int64(struct stats_event* event, int64_t value) {
	if (!overflows(event, sizeof(value))) {
	memcpy(&event->buf[event->size], &value, sizeof(value));
	event->size += sizeof(value);
	}
	}

	static void append_float(struct stats_event* event, float value) {
	if (!overflows(event, sizeof(value))) {
	memcpy(&event->buf[event->size], &value, sizeof(value));
	event->size += sizeof(float);
	}
	}

	static void append_byte_array(struct stats_event* event, const uint8_t* buf, size_t size) {
	if (!overflows(event, size)) {
	memcpy(&event->buf[event->size], buf, size);
	event->size += size;
	}
	}

	// Side-effect: modifies event->errors if buf is not properly null-terminated
	static void append_string(struct stats_event* event, const char* buf) {
	size_t size = strnlen(buf, MAX_EVENT_PAYLOAD);
	if (size == MAX_EVENT_PAYLOAD) {
	event->errors \|= ERROR_STRING_NOT_NULL_TERMINATED;
	return;
	}

	append_int32(event, size);
	append_byte_array(event, (uint8_t*)buf, size);
	}

	static void start_field(struct stats_event* event, uint8_t typeId) {
	event->lastFieldPos = event->size;
	append_byte(event, typeId);
	event->numElements++;
	}

	void stats_event_write_int32(struct stats_event* event, int32_t value) {
	if (event->errors) return;

	start_field(event, INT32_TYPE);
	append_int32(event, value);
	}

	void stats_event_write_int64(struct stats_event* event, int64_t value) {
	if (event->errors) return;

	start_field(event, INT64_TYPE);
	append_int64(event, value);
	}

	void stats_event_write_float(struct stats_event* event, float value) {
	if (event->errors) return;

	start_field(event, FLOAT_TYPE);
	append_float(event, value);
	}

	void stats_event_write_bool(struct stats_event* event, bool value) {
	if (event->errors) return;

	start_field(event, BOOL_TYPE);
	append_bool(event, value);
	}

	void stats_event_write_byte_array(struct stats_event* event, const uint8_t* buf, size_t numBytes) {
	if (event->errors) return;

	start_field(event, BYTE_ARRAY_TYPE);
	append_int32(event, numBytes);
	append_byte_array(event, buf, numBytes);
	}

	// Value is assumed to be encoded using UTF8
	void stats_event_write_string8(struct stats_event* event, const char* value) {
	if (event->errors) return;

	start_field(event, STRING_TYPE);
	append_string(event, value);
	}

	// Tags are assumed to be encoded using UTF8
	void stats_event_write_attribution_chain(struct stats_event* event, const uint32_t* uids,
	const char* const* tags, uint8_t numNodes) {
	if (numNodes > MAX_BYTE_VALUE) event->errors \|= ERROR_ATTRIBUTION_CHAIN_TOO_LONG;
	if (event->errors) return;

	start_field(event, ATTRIBUTION_CHAIN_TYPE);
	append_byte(event, numNodes);

	for (uint8_t i = 0; i < numNodes; i++) {
	append_int32(event, uids[i]);
	append_string(event, tags[i]);
	}
	}

	void stats_event_write_key_value_pairs(struct stats_event* event, struct key_value_pair* pairs,
	uint8_t numPairs) {
	if (numPairs > MAX_BYTE_VALUE) event->errors \|= ERROR_TOO_MANY_KEY_VALUE_PAIRS;
	if (event->errors) return;

	start_field(event, KEY_VALUE_PAIRS_TYPE);
	append_byte(event, numPairs);

	for (uint8_t i = 0; i < numPairs; i++) {
	append_int32(event, pairs[i].key);
	append_byte(event, pairs[i].valueType);
	switch (pairs[i].valueType) {
	case INT32_TYPE:
	append_int32(event, pairs[i].int32Value);
	break;
	case INT64_TYPE:
	append_int64(event, pairs[i].int64Value);
	break;
	case FLOAT_TYPE:
	append_float(event, pairs[i].floatValue);
	break;
	case STRING_TYPE:
	append_string(event, pairs[i].stringValue);
	break;
	default:
	event->errors \|= ERROR_INVALID_VALUE_TYPE;
	return;
	}
	}
	}

	// Side-effect: modifies event->errors if field has too many annotations
	static void increment_annotation_count(struct stats_event* event) {
	uint8_t fieldType = event->buf[event->lastFieldPos] & 0x0F;
	uint32_t oldAnnotationCount = (event->buf[event->lastFieldPos] & 0xF0) >> 4;
	uint32_t newAnnotationCount = oldAnnotationCount + 1;

	if (newAnnotationCount > MAX_ANNOTATION_COUNT) {
	event->errors \|= ERROR_TOO_MANY_ANNOTATIONS;
	return;
	}

	event->buf[event->lastFieldPos] = (((uint8_t)newAnnotationCount << 4) & 0xF0) \| fieldType;
	}

	void stats_event_add_bool_annotation(struct stats_event* event, uint8_t annotationId, bool value) {
	if (event->lastFieldPos == 0) event->errors \|= ERROR_ANNOTATION_DOES_NOT_FOLLOW_FIELD;
	if (annotationId > MAX_BYTE_VALUE) event->errors \|= ERROR_ANNOTATION_ID_TOO_LARGE;
	if (event->errors) return;

	append_byte(event, annotationId);
	append_byte(event, BOOL_TYPE);
	append_bool(event, value);
	increment_annotation_count(event);
	}

	void stats_event_add_int32_annotation(struct stats_event* event, uint8_t annotationId,
	int32_t value) {
	if (event->lastFieldPos == 0) event->errors \|= ERROR_ANNOTATION_DOES_NOT_FOLLOW_FIELD;
	if (annotationId > MAX_BYTE_VALUE) event->errors \|= ERROR_ANNOTATION_ID_TOO_LARGE;
	if (event->errors) return;

	append_byte(event, annotationId);
	append_byte(event, INT32_TYPE);
	append_int32(event, value);
	increment_annotation_count(event);
	}

	uint32_t stats_event_get_atom_id(struct stats_event* event) {
	return event->atomId;
	}

	uint8_t* stats_event_get_buffer(struct stats_event* event, size_t* size) {
	if (size) *size = event->size;
	return event->buf;
	}

	uint32_t stats_event_get_errors(struct stats_event* event) {
	return event->errors;
	}

	void stats_event_truncate_buffer(struct stats_event* event, bool truncate) {
	event->truncate = truncate;
	}

	void stats_event_build(struct stats_event* event) {
	if (event->built) return;

	if (event->atomId == 0) event->errors \|= ERROR_NO_ATOM_ID;

	if (event->numElements > MAX_BYTE_VALUE) {
	event->errors \|= ERROR_TOO_MANY_FIELDS;
	} else {
	event->buf[POS_NUM_ELEMENTS] = event->numElements;
	}

	// If there are errors, rewrite buffer.
	if (event->errors) {
	event->buf[POS_NUM_ELEMENTS] = 3;
	event->buf[POS_FIRST_FIELD] = ERROR_TYPE;
	memcpy(&event->buf[POS_FIRST_FIELD + sizeof(uint8_t)], &event->errors,
	sizeof(event->errors));
	event->size = POS_FIRST_FIELD + sizeof(uint8_t) + sizeof(uint32_t);
	}

	// Truncate the buffer to the appropriate length in order to limit our
	// memory usage.
	if (event->truncate) event->buf = (uint8_t*)realloc(event->buf, event->size);

	event->built = true;
	}

	int stats_event_write(struct stats_event* event) {
	stats_event_build(event);
	return write_buffer_to_statsd(&event->buf, event->size, event->atomId);
	}

	struct stats_event_api_table table = {
	stats_event_obtain,
	stats_event_build,
	stats_event_write,
	stats_event_release,
	stats_event_set_atom_id,
	stats_event_write_int32,
	stats_event_write_int64,
	stats_event_write_float,
	stats_event_write_bool,
	stats_event_write_byte_array,
	stats_event_write_string8,
	stats_event_write_attribution_chain,
	stats_event_write_key_value_pairs,
	stats_event_add_bool_annotation,
	stats_event_add_int32_annotation,
	stats_event_get_atom_id,
	stats_event_get_buffer,
	stats_event_get_errors,
	};