From: Francis Deslauriers Date: Tue, 12 May 2020 17:04:15 +0000 (-0400) Subject: Add msgpack implementation for serializing captures X-Git-Tag: v2.13.0-rc1~98 X-Git-Url: https://git.lttng.org./?a=commitdiff_plain;h=7ab8c61663d23386a58fb2f36ab8e22d1c0b1efd;p=lttng-modules.git Add msgpack implementation for serializing captures Signed-off-by: Francis Deslauriers Signed-off-by: Mathieu Desnoyers Change-Id: I7d9cfd4906c5c047cfb4fc9467b293c4e895523d --- diff --git a/include/lttng/msgpack.h b/include/lttng/msgpack.h new file mode 100644 index 00000000..e5c011ea --- /dev/null +++ b/include/lttng/msgpack.h @@ -0,0 +1,61 @@ +#ifndef _LTTNG_UST_MSGPACK_H +#define _LTTNG_UST_MSGPACK_H + +/* + * msgpack.h + * + * Copyright (C) 2020 Francis Deslauriers + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; only + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#include +#ifdef __KERNEL__ +#include +#else /* __KERNEL__ */ +#include +#endif /* __KERNEL__ */ + +struct lttng_msgpack_writer { + uint8_t *buffer; + uint8_t *write_pos; + const uint8_t *end_write_pos; + uint8_t array_nesting; + uint8_t map_nesting; +}; + +void lttng_msgpack_writer_init( + struct lttng_msgpack_writer *writer, + uint8_t *buffer, size_t size); + +void lttng_msgpack_writer_fini(struct lttng_msgpack_writer *writer); + +int lttng_msgpack_write_nil(struct lttng_msgpack_writer *writer); +int lttng_msgpack_write_true(struct lttng_msgpack_writer *writer); +int lttng_msgpack_write_false(struct lttng_msgpack_writer *writer); +int lttng_msgpack_write_unsigned_integer( + struct lttng_msgpack_writer *writer, uint64_t value); +int lttng_msgpack_write_signed_integer( + struct lttng_msgpack_writer *writer, int64_t value); +int lttng_msgpack_write_double(struct lttng_msgpack_writer *writer, double value); +int lttng_msgpack_write_str(struct lttng_msgpack_writer *writer, + const char *value); +int lttng_msgpack_begin_map(struct lttng_msgpack_writer *writer, size_t count); +int lttng_msgpack_end_map(struct lttng_msgpack_writer *writer); +int lttng_msgpack_begin_array( + struct lttng_msgpack_writer *writer, size_t count); +int lttng_msgpack_end_array(struct lttng_msgpack_writer *writer); + +#endif /* _LTTNG_UST_MSGPACK_H */ diff --git a/src/Kbuild b/src/Kbuild index 6e4b50cf..e9b50d57 100644 --- a/src/Kbuild +++ b/src/Kbuild @@ -19,7 +19,8 @@ obj-$(CONFIG_LTTNG) += lttng-tracer.o obj-$(CONFIG_LTTNG) += lttng-wrapper.o -lttng-tracer-objs := lttng-events.o lttng-abi.o lttng-string-utils.o \ +lttng-tracer-objs := lib/msgpack/msgpack.o \ + lttng-events.o lttng-abi.o lttng-string-utils.o \ lttng-probes.o lttng-context.o \ lttng-context-pid.o lttng-context-procname.o \ lttng-context-prio.o lttng-context-nice.o \ diff --git a/src/lib/msgpack/msgpack.c b/src/lib/msgpack/msgpack.c new file mode 100644 index 00000000..0803bc65 --- /dev/null +++ b/src/lib/msgpack/msgpack.c @@ -0,0 +1,517 @@ +/* + * msgpack.c + * + * Copyright (C) 2020 Francis Deslauriers + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; only + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#define _GNU_SOURCE +#define _LGPL_SOURCE +#include + +#define MSGPACK_FIXSTR_ID_MASK 0xA0 +#define MSGPACK_FIXMAP_ID_MASK 0x80 +#define MSGPACK_FIXARRAY_ID_MASK 0x90 + +#define MSGPACK_NIL_ID 0xC0 +#define MSGPACK_FALSE_ID 0xC2 +#define MSGPACK_TRUE_ID 0xC3 +#define MSGPACK_MAP16_ID 0xDE +#define MSGPACK_ARRAY16_ID 0xDC + +#define MSGPACK_UINT8_ID 0xCC +#define MSGPACK_UINT16_ID 0xCD +#define MSGPACK_UINT32_ID 0xCE +#define MSGPACK_UINT64_ID 0xCF + +#define MSGPACK_INT8_ID 0xD0 +#define MSGPACK_INT16_ID 0xD1 +#define MSGPACK_INT32_ID 0xD2 +#define MSGPACK_INT64_ID 0xD3 + +#define MSGPACK_FLOAT64_ID 0xCB +#define MSGPACK_STR16_ID 0xDA + +#define MSGPACK_FIXINT_MAX ((1 << 7) - 1) +#define MSGPACK_FIXINT_MIN -(1 << 5) +#define MSGPACK_FIXMAP_MAX_COUNT 15 +#define MSGPACK_FIXARRAY_MAX_COUNT 15 +#define MSGPACK_FIXSTR_MAX_LENGTH 31 + +#ifdef __KERNEL__ +#include +#include +#include + +#include + +#define INT8_MIN (-128) +#define INT16_MIN (-32767-1) +#define INT32_MIN (-2147483647-1) +#define INT8_MAX (127) +#define INT16_MAX (32767) +#define INT32_MAX (2147483647) +#define UINT8_MAX (255) +#define UINT16_MAX (65535) +#define UINT32_MAX (4294967295U) + +#define byteswap_host_to_be16(_tmp) cpu_to_be16(_tmp) +#define byteswap_host_to_be32(_tmp) cpu_to_be32(_tmp) +#define byteswap_host_to_be64(_tmp) cpu_to_be64(_tmp) + +#define lttng_msgpack_assert(cond) WARN_ON(!(cond)) + +#else /* __KERNEL__ */ + +#include +#include +#include + +#include "msgpack.h" + +#define byteswap_host_to_be16(_tmp) htobe16(_tmp) +#define byteswap_host_to_be32(_tmp) htobe32(_tmp) +#define byteswap_host_to_be64(_tmp) htobe64(_tmp) + +#define lttng_msgpack_assert(cond) ({ \ + if (!(cond)) \ + fprintf(stderr, "Assertion failed. %s:%d\n", __FILE__, __LINE__); \ + }) +#endif /* __KERNEL__ */ + +static inline int lttng_msgpack_append_buffer( + struct lttng_msgpack_writer *writer, + const uint8_t *buf, + size_t length) +{ + int ret = 0; + + lttng_msgpack_assert(buf); + + /* Ensure we are not trying to write after the end of the buffer. */ + if (writer->write_pos + length > writer->end_write_pos) { + ret = -1; + goto end; + } + + memcpy(writer->write_pos, buf, length); + writer->write_pos += length; +end: + return ret; +} + +static inline int lttng_msgpack_append_u8( + struct lttng_msgpack_writer *writer, uint8_t value) +{ + return lttng_msgpack_append_buffer(writer, &value, sizeof(value)); +} + +static inline int lttng_msgpack_append_u16( + struct lttng_msgpack_writer *writer, uint16_t value) +{ + value = byteswap_host_to_be16(value); + + return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value)); +} + +static inline int lttng_msgpack_append_u32( + struct lttng_msgpack_writer *writer, uint32_t value) +{ + value = byteswap_host_to_be32(value); + + return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value)); +} + +static inline int lttng_msgpack_append_u64( + struct lttng_msgpack_writer *writer, uint64_t value) +{ + value = byteswap_host_to_be64(value); + + return lttng_msgpack_append_buffer(writer, (uint8_t *) &value, sizeof(value)); +} + +static inline int lttng_msgpack_append_f64( + struct lttng_msgpack_writer *writer, double value) +{ + + union { + double d; + uint64_t u; + } u; + + u.d = value; + + return lttng_msgpack_append_u64(writer, u.u); +} + +static inline int lttng_msgpack_append_i8( + struct lttng_msgpack_writer *writer, int8_t value) +{ + return lttng_msgpack_append_u8(writer, (uint8_t) value); +} + +static inline int lttng_msgpack_append_i16( + struct lttng_msgpack_writer *writer, int16_t value) +{ + return lttng_msgpack_append_u16(writer, (uint16_t) value); +} + +static inline int lttng_msgpack_append_i32( + struct lttng_msgpack_writer *writer, int32_t value) +{ + return lttng_msgpack_append_u32(writer, (uint32_t) value); +} + +static inline int lttng_msgpack_append_i64( + struct lttng_msgpack_writer *writer, int64_t value) +{ + return lttng_msgpack_append_u64(writer, (uint64_t) value); +} + +static inline int lttng_msgpack_encode_f64( + struct lttng_msgpack_writer *writer, double value) +{ + int ret; + + ret = lttng_msgpack_append_u8(writer, MSGPACK_FLOAT64_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_f64(writer, value); + if (ret) + goto end; + +end: + return ret; +} + +static inline int lttng_msgpack_encode_fixmap( + struct lttng_msgpack_writer *writer, uint8_t count) +{ + int ret = 0; + + lttng_msgpack_assert(count <= MSGPACK_FIXMAP_MAX_COUNT); + + ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXMAP_ID_MASK | count); + if (ret) + goto end; + +end: + return ret; +} + +static inline int lttng_msgpack_encode_map16( + struct lttng_msgpack_writer *writer, uint16_t count) +{ + int ret; + + lttng_msgpack_assert(count > MSGPACK_FIXMAP_MAX_COUNT); + + ret = lttng_msgpack_append_u8(writer, MSGPACK_MAP16_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_u16(writer, count); + if (ret) + goto end; + +end: + return ret; +} + +static inline int lttng_msgpack_encode_fixarray( + struct lttng_msgpack_writer *writer, uint8_t count) +{ + int ret = 0; + + lttng_msgpack_assert(count <= MSGPACK_FIXARRAY_MAX_COUNT); + + ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXARRAY_ID_MASK | count); + if (ret) + goto end; + +end: + return ret; +} + +static inline int lttng_msgpack_encode_array16( + struct lttng_msgpack_writer *writer, uint16_t count) +{ + int ret; + + lttng_msgpack_assert(count > MSGPACK_FIXARRAY_MAX_COUNT); + + ret = lttng_msgpack_append_u8(writer, MSGPACK_ARRAY16_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_u16(writer, count); + if (ret) + goto end; + +end: + return ret; +} + +static inline int lttng_msgpack_encode_fixstr( + struct lttng_msgpack_writer *writer, + const char *str, + uint8_t len) +{ + int ret; + + lttng_msgpack_assert(len <= MSGPACK_FIXSTR_MAX_LENGTH); + + ret = lttng_msgpack_append_u8(writer, MSGPACK_FIXSTR_ID_MASK | len); + if (ret) + goto end; + + ret = lttng_msgpack_append_buffer(writer, (uint8_t *) str, len); + if (ret) + goto end; + +end: + return ret; +} + +static inline int lttng_msgpack_encode_str16( + struct lttng_msgpack_writer *writer, + const char *str, + uint16_t len) +{ + int ret; + + lttng_msgpack_assert(len > MSGPACK_FIXSTR_MAX_LENGTH); + + ret = lttng_msgpack_append_u8(writer, MSGPACK_STR16_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_u16(writer, len); + if (ret) + goto end; + + ret = lttng_msgpack_append_buffer(writer, (uint8_t *) str, len); + if (ret) + goto end; + +end: + return ret; +} + +int lttng_msgpack_begin_map(struct lttng_msgpack_writer *writer, size_t count) +{ + int ret; + + if (count < 0 || count >= (1 << 16)) { + ret = -1; + goto end; + } + + if (count <= MSGPACK_FIXMAP_MAX_COUNT) + ret = lttng_msgpack_encode_fixmap(writer, count); + else + ret = lttng_msgpack_encode_map16(writer, count); + + writer->map_nesting++; +end: + return ret; +} + +int lttng_msgpack_end_map(struct lttng_msgpack_writer *writer) +{ + lttng_msgpack_assert(writer->map_nesting > 0); + writer->map_nesting--; + return 0; +} + +int lttng_msgpack_begin_array( + struct lttng_msgpack_writer *writer, size_t count) +{ + int ret; + + if (count < 0 || count >= (1 << 16)) { + ret = -1; + goto end; + } + + if (count <= MSGPACK_FIXARRAY_MAX_COUNT) + ret = lttng_msgpack_encode_fixarray(writer, count); + else + ret = lttng_msgpack_encode_array16(writer, count); + + writer->array_nesting++; +end: + return ret; +} + +int lttng_msgpack_end_array(struct lttng_msgpack_writer *writer) +{ + lttng_msgpack_assert(writer->array_nesting > 0); + writer->array_nesting--; + return 0; +} + +int lttng_msgpack_write_str(struct lttng_msgpack_writer *writer, + const char *str) +{ + int ret; + size_t length = strlen(str); + if (length < 0 || length >= (1 << 16)) { + ret = -1; + goto end; + } + + if (length <= MSGPACK_FIXSTR_MAX_LENGTH) + ret = lttng_msgpack_encode_fixstr(writer, str, length); + else + ret = lttng_msgpack_encode_str16(writer, str, length); + +end: + return ret; +} + +int lttng_msgpack_write_nil(struct lttng_msgpack_writer *writer) +{ + return lttng_msgpack_append_u8(writer, MSGPACK_NIL_ID); +} + +int lttng_msgpack_write_true(struct lttng_msgpack_writer *writer) +{ + return lttng_msgpack_append_u8(writer, MSGPACK_TRUE_ID); +} + +int lttng_msgpack_write_false(struct lttng_msgpack_writer *writer) +{ + return lttng_msgpack_append_u8(writer, MSGPACK_FALSE_ID); +} + +int lttng_msgpack_write_unsigned_integer( + struct lttng_msgpack_writer *writer, uint64_t value) +{ + int ret = 0; + + if (value <= MSGPACK_FIXINT_MAX) { + ret = lttng_msgpack_append_u8(writer, (uint8_t) value); + if (ret) + goto end; + } else if (value <= UINT8_MAX) { + ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT8_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_u8(writer, (uint8_t) value); + if (ret) + goto end; + } else if (value <= UINT16_MAX) { + ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT16_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_u16(writer, (uint16_t) value); + if (ret) + goto end; + } else if (value <= UINT32_MAX) { + ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT32_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_u32(writer, (uint32_t) value); + if (ret) + goto end; + } else { + ret = lttng_msgpack_append_u8(writer, MSGPACK_UINT64_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_u64(writer, value); + if (ret) + goto end; + } + +end: + return ret; +} + +int lttng_msgpack_write_signed_integer(struct lttng_msgpack_writer *writer, int64_t value) +{ + int ret; + + if (value >= MSGPACK_FIXINT_MIN && value <= MSGPACK_FIXINT_MAX){ + ret = lttng_msgpack_append_i8(writer, (int8_t) value); + if (ret) + goto end; + } else if (value >= INT8_MIN && value <= INT8_MAX) { + ret = lttng_msgpack_append_u8(writer, MSGPACK_INT8_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_i8(writer, (int8_t) value); + if (ret) + goto end; + } else if (value >= INT16_MIN && value <= INT16_MAX) { + ret = lttng_msgpack_append_u8(writer, MSGPACK_INT16_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_i16(writer, (int16_t) value); + if (ret) + goto end; + } else if (value >= INT32_MIN && value <= INT32_MAX) { + ret = lttng_msgpack_append_u8(writer, MSGPACK_INT32_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_i32(writer, (int32_t) value); + if (ret) + goto end; + } else { + ret = lttng_msgpack_append_u8(writer, MSGPACK_INT64_ID); + if (ret) + goto end; + + ret = lttng_msgpack_append_i64(writer, value); + if (ret) + goto end; + } + +end: + return ret; +} + +int lttng_msgpack_write_double(struct lttng_msgpack_writer *writer, double value) +{ + return lttng_msgpack_encode_f64(writer, value); +} + +void lttng_msgpack_writer_init(struct lttng_msgpack_writer *writer, + uint8_t *buffer, size_t size) +{ + lttng_msgpack_assert(buffer); + lttng_msgpack_assert(size >= 0); + + writer->buffer = buffer; + writer->write_pos = buffer; + writer->end_write_pos = buffer + size; + + writer->array_nesting = 0; + writer->map_nesting = 0; +} + +void lttng_msgpack_writer_fini(struct lttng_msgpack_writer *writer) +{ + memset(writer, 0, sizeof(*writer)); +}