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Разработана утилита для многопоточного сжатия файлов WebAssembly

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Глеб Иваницкий
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# Wasm Encoding Tool
![Static Badge](https://img.shields.io/badge/Powered%20by-csasq-blue)
![Static Badge](https://img.shields.io/badge/Python-3.9%2B-blue)
![Static Badge](https://img.shields.io/badge/License-CC%20BY--NC%204.0-blue)
Утилита для сжатия файлов WebAssembly (Wasm) с использованием наиболее распространенных кодировок, поддерживаемых браузерами. Данный подход позволяет заранее подготовить сжатые файлы для отдачи их веб-сервером.
## Преимущества
Ниже приведено сравнение размера Wasm без сжатия и с применением максимального уровня сжатия каждым из поддерживаемых алгоритмов.
Размер исходного файла Wasm — 8.0M.
| Алгоритм сжатия | Размер | Коэффициент сжатия | Степень сжатия |
|-----------------|-------:|-------------------:|---------------:|
| Brotli | 2.5M | 3.2 | 68.75% |
| Zstandard | 2.6M | 3.08 | 67.5% |
| Gzip | 3.1M | 2.58 | 61.25% |
| Deflate | 3.1M | 2.58 | 61.25% |
Как следует из таблицы, в лучшем случае сжатый файл имеет размер приблизительно в 3,2 раза меньше, чем исходный.
## Рекомендации
1. Следите за пересечением относительных путей, если меняете предустановленные значения конфигурации.
2. Протестируйте работу утилиты с различным количеством параллельных потоков. Зачастую, вы можете запускать сжатие с неограниченно большим значением параметра `max_threads`. В лучшем случае получится добиться сжатия каждого файла каждым алгоритмом в отдельном потоке. В худшем случае процесс будет убит средствами OOM Killer.
## Конфигурация
Файл конфигурации следует расположить в `./config.ini` относительно рабочей директории утилиты.
Ниже приведен пример конфигурации со всеми возможными разделами и параметрами. Все пути за исключением параметра `Main.base_path` можно указывать как абсолютными, так и относительными.
```ini
[Main]
base_path = /opt/my-project
max_threads = 4
log_level = info
[Input]
path = ./source
[Output]
path = ./public
dir_mode = 755
file_mode = 644
[Output.Wasm.Source]
enabled = true
path = ./wasm/src
[Output.Wasm.Brotli]
enabled = true
path = ./wasm/br
level = 11
[Output.Wasm.Zstandard]
enabled = true
path = ./wasm/zstd
level = 22
[Output.Wasm.Gzip]
enabled = true
path = ./wasm/gzip
level = 9
[Output.Wasm.Deflate]
enabled = true
path = ./wasm/deflate
level = 9
[Output.Other]
enabled = true
path = .
[Backup]
enabled = true
path = ./backup
```
### Раздел `Main`
Содержит основные параметры утилиты.
- `base_path` — базовый путь для построения относительных путей;
- `max_threads` — максимальное количество параллельных потоков;
- `log_level` — уровень логирования (`critical`, `fatal`, `error`, `warn`, `warning`, `info`, `debug`, `notset`).
### Раздел `Input`
Содержит параметры входной директории. Относительные пути строятся от `Main.base_path`.
- `path` — путь до исходников веб-приложения.
### Раздел `Output`
Содержит параметры выходной директории. Относительные пути строятся от `Main.base_path`.
- `path` — путь до исходников веб-приложения после сжатия;
- `dir_mode` — режим доступа к директориям;
- `file_mode` — режим доступа файлам.
### Раздел `Output.Wasm.Source`
Содержит параметры копирования исходников Wasm. Относительные пути строятся от `Output.path`.
- `enabled` — включить копирование исходников Wasm;
- `path` — путь до исходников Wasm.
### Разделы `Output.Wasm.Brotli`, `Output.Wasm.Zstandard`, `Output.Wasm.Gzip`, `Output.Wasm.Deflate`
Содержит параметры сжатия исходников Wasm. Относительные пути строятся от `Output.path`.
- `enabled` — включить сжатие исходников Wasm алгоритмом;
- `path` — путь до сжатых исходников;
- `level` — уровень сжатия:
- Brotli — с `1` по `11`,
- Zstandard — с `1` по `22`,
- Gzip — с `1` по `9`,
- Deflate — с `1` по `9`.
### Раздел `Output.Other`
Содержит параметры копирования прочих исходников. Относительные пути строятся от `Output.path`.
- `enabled` — включить копирование прочих файлов;
- `path` — путь до прочих файлов.
### Раздел `Backup`
Содержит параметры резервной копии. Относительные пути строятся от `Main.base_path`.
- `enabled` — включить создание резервной копии;
- `path` — путь до резервной копии.
## Конфигурация Nginx
Ниже приведен пример конфигурации Nginx для корректной отдачи файлов Wasm с указанием заголовков `Content-Type` и `Content-Length`.
Обратите внимание на порядок элементов в `map $http_accept_encoding $wasm_accept_encoding`. Изменив этот порядок, вы можете повлиять на приоритет применения алгоритмов сжатия.
```nginx
map $http_accept_encoding $wasm_accept_encoding {
"~br" "br";
"~zstd" "zstd";
"~gzip" "gzip";
"~deflate" "deflate";
default "src";
}
map $wasm_accept_encoding $wasm_content_encoding {
"br" "br";
"zstd" "zstd";
"gzip" "gzip";
"deflate" "deflate";
default "";
}
root /opt/my-project/public;
location / {
try_files $uri /index.html;
}
location ~* \.wasm$ {
try_files /wasm/$wasm_accept_encoding/$uri =404;
default_type application/wasm;
add_header "Content-Encoding" $wasm_content_encoding;
}
```

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from .main import run

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import gzip
import zlib
import brotli
import zstandard
def compress_with_brotli(
data: bytes,
level: int,
):
return brotli.compress(
data,
quality=level,
)
def compress_with_zstandard(
data: bytes,
level: int,
):
return zstandard.ZstdCompressor(
level=level,
).compress(data)
def compress_with_gzip(
data: bytes,
level: int,
):
return gzip.compress(
data,
compresslevel=level,
)
def compress_with_deflate(
data: bytes,
level: int,
):
return zlib.compress(
data,
level=level,
)

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from concurrent.futures import ThreadPoolExecutor, Future
import logging
from pathlib import PurePath, Path
import shutil
import config
from .algorithms import compress_with_brotli, compress_with_zstandard, compress_with_gzip, compress_with_deflate
from .utils import get_paths, copy_paths, log
logging.basicConfig(
level=config.Main.log_level,
)
logger = logging.getLogger('WasmEncodingTool')
config.Output.Wasm.Brotli.compress = compress_with_brotli
config.Output.Wasm.Zstandard.compress = compress_with_zstandard
config.Output.Wasm.Gzip.compress = compress_with_gzip
config.Output.Wasm.Deflate.compress = compress_with_deflate
algorithms = [
config.Output.Wasm.Brotli,
config.Output.Wasm.Zstandard,
config.Output.Wasm.Gzip,
config.Output.Wasm.Deflate,
]
def backup():
@log(
logger=logger,
start_text='Backup',
success_text='Success backup',
)
def run():
shutil.rmtree(
config.Backup.path,
ignore_errors=True,
)
shutil.copytree(
config.Output.path,
config.Backup.path,
)
if not config.Backup.enabled:
logger.info('Backup disabled')
return
if not Path(config.Output.path).exists():
logger.info('Backup skipped (output path don\'t exists)')
return
run()
def copy_wasm_source(
input_wasm_paths: list[PurePath],
):
@log(
logger=logger,
start_text='Copy wasm source',
success_text='Success copy wasm source',
)
def run():
copy_paths(
from_dir_path=config.Input.path,
to_dir_path=config.Output.Wasm.Source.path,
paths=input_wasm_paths,
)
if not config.Output.Wasm.Source.enabled:
logger.info('Copy wasm source disabled')
return
if not len(input_wasm_paths):
logger.info('Copy wasm source skipped (input path don\'t exists)')
return
run()
def copy_other_source(
input_other_paths: list[PurePath],
):
@log(
logger=logger,
start_text='Copy other source',
success_text='Success copy other source',
)
def run():
copy_paths(
from_dir_path=config.Input.path,
to_dir_path=config.Output.Other.path,
paths=input_other_paths,
)
if not config.Output.Other.enabled:
logger.info('Copy other source disabled')
return
if not len(input_other_paths):
logger.info('Copy other source skipped (input path don\'t exists)')
return
run()
def compress_file_with_algorithm(
file_path: PurePath,
algorithm: config.Algorithm,
):
@log(
logger=logger,
start_text='Compress %s with %s' % (
file_path,
algorithm.name,
),
success_text='Success compress %s with %s' % (
file_path,
algorithm.name,
),
)
def run():
Path(algorithm.path).mkdir(
parents=True,
exist_ok=True,
)
with (
Path(config.Input.path, file_path).open('rb') as file_in,
Path(algorithm.path, file_path).open('wb') as file_out,
):
file_out.write(algorithm.compress(
data=file_in.read(),
level=algorithm.level,
))
run()
def compress(
executor: ThreadPoolExecutor,
input_wasm_paths: list[PurePath],
):
@log(
logger=logger,
start_text='Compress',
success_text='Success compress',
)
def run():
futures: list[Future] = []
for algorithm in algorithms:
if not algorithm.enabled:
logger.info('Skipped compress with %s' % algorithm.name)
continue
for path in input_wasm_paths:
future = executor.submit(
compress_file_with_algorithm,
file_path=path,
algorithm=algorithm,
)
futures.append(future)
for future in futures:
future.result()
if not len(input_wasm_paths):
logger.info('Compress skipped (input path don\'t exists)')
return
run()
def run_multithreading_tasks(
input_wasm_paths: list[PurePath],
input_other_paths: list[PurePath],
):
@log(
logger=logger,
start_text='Run multithreading tasks',
success_text='Success run multithreading tasks',
)
def run():
shutil.rmtree(
config.Output.path,
ignore_errors=True,
)
with ThreadPoolExecutor(
max_workers=config.Main.max_threads,
) as executor:
executor.submit(
copy_wasm_source,
input_wasm_paths=input_wasm_paths,
)
executor.submit(
copy_other_source,
input_other_paths=input_other_paths,
)
compress(
executor=executor,
input_wasm_paths=input_wasm_paths,
)
run()
def change_mode():
@log(
logger=logger,
start_text='Change mode',
success_text='Success change mode',
)
def run():
for path in Path(config.Output.path).rglob('*'):
if path.is_dir():
path.chmod(config.Output.dir_mode)
elif path.is_file():
path.chmod(config.Output.file_mode)
path.chmod(config.Output.dir_mode)
if not Path(config.Output.path).exists():
logger.info('Change mode skipped (output path don\'t exists)')
return
run()
def run():
@log(
logger=logger,
start_text='Start',
success_text='Done',
)
def run():
backup()
run_multithreading_tasks(
input_wasm_paths=get_paths(
from_dir_path=config.Input.path,
pattern='*.wasm',
check_function=lambda path: path.is_file(),
),
input_other_paths=get_paths(
from_dir_path=config.Input.path,
pattern='*',
check_function=lambda path: path.is_file() and path.suffix != '.wasm',
),
)
change_mode()
run()

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app/utils.py Normal file
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from logging import Logger
from pathlib import PurePath, Path
import shutil
from time import perf_counter
from typing import Callable
def get_paths(
from_dir_path: PurePath,
pattern: str,
check_function: Callable = lambda path: True,
) -> list[PurePath]:
from_dir_path = Path(from_dir_path)
return [
PurePath(path.relative_to(from_dir_path))
for path in from_dir_path.rglob(pattern)
if check_function(path)
]
def copy_paths(
from_dir_path: PurePath,
to_dir_path: PurePath,
paths: list[PurePath],
):
for path in paths:
to_file_path = Path(to_dir_path) / path
to_file_path.parent.mkdir(
parents=True,
exist_ok=True,
)
shutil.copy2(
Path(from_dir_path) / path,
to_file_path,
)
def log(
logger: Logger,
start_text: str,
success_text: str,
):
def decorator(func):
def wrapper(*args, **kwargs):
logger.info(start_text)
start_time = perf_counter()
func()
end_time = perf_counter()
logger.info('%s (%f s)' % (
success_text,
end_time - start_time,
))
return wrapper
return decorator

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config/__init__.py Normal file
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from .main import Main, Input, Output, Backup
from .models import Algorithm

13
config/levels.py Normal file
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from logging import CRITICAL, FATAL, ERROR, WARNING, INFO, DEBUG, NOTSET
levels = {
'CRITICAL': CRITICAL,
'FATAL': FATAL,
'ERROR': ERROR,
'WARN': WARNING,
'WARNING': WARNING,
'INFO': INFO,
'DEBUG': DEBUG,
'NOTSET': NOTSET,
}

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config/main.py Normal file
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import configparser
from pathlib import PurePath
from typing import Callable
from .levels import levels
from .models import Algorithm
config = configparser.RawConfigParser()
config.read(
filenames='./config.ini',
encoding='utf-8',
)
class Main:
base_path = PurePath(config.get(
section='Main',
option='base_path',
))
max_threads = config.getint(
section='Main',
option='max_threads',
fallback=4,
)
log_level = levels.get(
config.get(
section='Main',
option='log_level',
fallback='info',
).upper()
)
class Input:
path = PurePath(config.get(
section='Input',
option='path',
))
class Output:
path = PurePath(config.get(
section='Output',
option='path',
))
dir_mode = int(config.get(
section='Output',
option='dir_mode',
fallback='755',
), 8)
file_mode = int(config.get(
section='Output',
option='file_mode',
fallback='644',
), 8)
class Wasm:
class Source:
enabled = config.getboolean(
section='Output.Wasm.Source',
option='enabled',
fallback=True,
)
path = PurePath(config.get(
section='Output.Wasm.Source',
option='path',
fallback=PurePath('.', 'wasm', 'src'),
))
class Brotli(Algorithm):
compress: Callable
name = 'Brotli'
enabled = config.getboolean(
section='Output.Wasm.Brotli',
option='enabled',
fallback=True,
)
path = PurePath(config.get(
section='Output.Wasm.Brotli',
option='path',
fallback=PurePath('.', 'wasm', 'br'),
))
level = config.getint(
section='Output.Wasm.Brotli',
option='level',
fallback=11,
)
class Zstandard(Algorithm):
compress: Callable
name = 'Zstandard'
enabled = config.getboolean(
section='Output.Wasm.Zstandard',
option='enabled',
fallback=True,
)
path = PurePath(config.get(
section='Output.Wasm.Zstandard',
option='path',
fallback=PurePath('.', 'wasm', 'zstd'),
))
level = config.getint(
section='Output.Wasm.Zstandard',
option='level',
fallback=22,
)
class Gzip(Algorithm):
compress: Callable
name = 'Gzip'
enabled = config.getboolean(
section='Output.Wasm.Gzip',
option='enabled',
fallback=True,
)
path = PurePath(config.get(
section='Output.Wasm.Gzip',
option='path',
fallback=PurePath('.', 'wasm', 'gzip'),
))
level = config.getint(
section='Output.Wasm.Gzip',
option='level',
fallback=9,
)
class Deflate(Algorithm):
compress: Callable
name = 'Deflate'
enabled = config.getboolean(
section='Output.Wasm.Deflate',
option='enabled',
fallback=True,
)
path = PurePath(config.get(
section='Output.Wasm.Deflate',
option='path',
fallback=PurePath('.', 'wasm', 'deflate'),
))
level = config.getint(
section='Output.Wasm.Deflate',
option='level',
fallback=9,
)
class Other:
enabled = config.getboolean(
section='Output.Other',
option='enabled',
fallback=True,
)
path = PurePath(config.get(
section='Output.Other',
option='path',
fallback=PurePath('.'),
))
class Backup:
enabled = config.getboolean(
section='Backup',
option='enabled',
fallback=True,
)
path = PurePath(config.get(
section='Backup',
option='path',
fallback=PurePath(Main.base_path, 'backup'),
))
Input.path = Main.base_path / Input.path
Output.path = Main.base_path / Output.path
Backup.path = Main.base_path / Backup.path
Output.Wasm.Source.path = Output.path / Output.Wasm.Source.path
Output.Wasm.Brotli.path = Output.path / Output.Wasm.Brotli.path
Output.Wasm.Zstandard.path = Output.path / Output.Wasm.Zstandard.path
Output.Wasm.Gzip.path = Output.path / Output.Wasm.Gzip.path
Output.Wasm.Deflate.path = Output.path / Output.Wasm.Deflate.path
Output.Other.path = Output.path / Output.Other.path

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config/models.py Normal file
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from pathlib import PurePath
from typing import Callable, Type
class BaseAlgorithm:
compress: Callable
name: str
enabled: bool
path: PurePath
level: int
Algorithm = Type[BaseAlgorithm]

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main.py Normal file
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import app
if __name__ == '__main__':
app.run()

2
requirements.txt Normal file
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brotli
zstandard