gatling 0.2.4.3

A unified I/O management toolkit supporting threads, coroutines, files, databases, and data formats

🧩 Gatling Utility Library

Gatling is a lightweight asynchronous utility library built on aiohttp, asyncio, and threading. It provides concurrent HTTP requests, coroutine-thread orchestration, data pipelines, and handy file utilities.

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📦 Installation

pip install gatling

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📁 Module Overview

Module	Description
http_client.py	Async/sync HTTP request handling
coroutine_thread_mana.py	Thread + coroutine concurrent task manager
file_utils.py	Common file read/write helpers
taskflow_manager.py	Multi-stage task pipeline system
watch.py	Stopwatch and timing tools

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🌐 1. HTTP Client Module

File: gatling/utility/http_client.py

Provides unified async/sync HTTP request helpers supporting GET, POST, PUT, and DELETE.

Example

from gatling.utility.http_fetch_fctns import sync_fetch_http, async_fetch_http, fwrap
import asyncio, aiohttp

# --- Synchronous request ---
result, status, size = sync_fetch_http("https://httpbin.org/get")
print(status, size, result[:80])


# --- Asynchronous request ---
async def main():
    async with aiohttp.ClientSession() as session:
        res, status, size = await async_fetch_http(
            "https://httpbin.org/ip", session=session, rtype="json"
        )
        print(res)


asyncio.run(main())

Main functions

• async_fetch_http(...): Generic async HTTP fetcher
• fwrap(...): Safely manages aiohttp session lifecycle
• sync_fetch_http(...): Simple synchronous wrapper (for scripts)

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🧵 2. Coroutine & Thread Manager

File: gatling/utility/coroutine_thread_mana.py

A hybrid thread + coroutine manager that can run both sync and async tasks concurrently.

Example

from gatling.utility.coroutine_thread_mana import CoroutineThreadManager
import asyncio, time


# --- Async task ---
async def async_job(name, delay=0.5):
    print(f"{name} running")
    await asyncio.sleep(delay)


# --- Sync task ---
def sync_job(name, delay=0.5):
    print(f"{name} running")
    time.sleep(delay)


# Async mode
m = CoroutineThreadManager(async_job, args=("async-A",), kwargs={"delay": 0.3})
m.start(thread_worker=2, coroutine_worker=2)
time.sleep(2)
m.stop()

# Sync mode
m = CoroutineThreadManager(sync_job, args=("sync-B",), kwargs={"delay": 0.2})
m.start(thread_worker=2)
time.sleep(2)
m.stop()

Main methods

• .start(thread_worker, coroutine_worker): Starts the workers
• .stop(): Stops all threads safely

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💾 3. File Utility Module

File: gatling/utility/file_utils.py

Convenient helpers for reading and writing JSON, JSONL, Pickle, TOML, text, and byte files.

Example

from gatling.utility.io_fctns import *

save_json({"a": 1}, "data.json")
print(read_json("data.json"))

save_jsonl([{"x": 1}, {"x": 2}], "data.jsonl")
print(read_jsonl("data.jsonl"))

save_text("Hello world", "msg.txt")
print(read_text("msg.txt"))

Main functions

• save_json / read_json
• save_jsonl / read_jsonl
• save_text / read_text
• save_pickle / read_pickle
• save_bytes / read_bytes
• read_toml
• remove_file

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🔄 4. Task Flow Manager

File: gatling/utility/taskflow_manager.py

Builds a multi-stage processing pipeline — combining threads, coroutines, and queues. Each stage can be synchronous or asynchronous.

Example

from gatling.utility.task_flow_manager import TaskFlowManager
from queue import Queue
import asyncio, time


def sync_square(x):
    time.sleep(0.2)
    return x * x


async def async_double(x):
    await asyncio.sleep(0.3)
    return x * 2


def sync_to_str(x):
    return f"Result: {x}"


q_wait = Queue()
q_done = Queue()

tfm = TaskFlowManager(q_wait, q_done, retry_on_error=False)
tfm.append_stagefctn(sync_square)
tfm.append_stagefctn(async_double)
tfm.append_stagefctn(sync_to_str)

for i in range(5):
    q_wait.put(i)

tfm.start()
tfm.await_print(interval=1)
tfm.stop()

print(list(q_done.queue))

Main classes

• TaskFlowManager: Coordinates multi-stage parallel workflows
• TaskQueueTracker: Monitors queue states, errors, and speed metrics

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⏱️ 5. Stopwatch Utility

File: gatling/utility/watch.py

A simple stopwatch for timing operations, plus a decorator for measuring function execution time.

Example

from gatling.utility.watch import Watch, watch_time
import time


@watch_time
def slow_func():
    time.sleep(1)


slow_func()

w = Watch()
time.sleep(0.5)
print("Δt:", w.see_seconds(), "Total:", w.total_seconds())

Main items

• Watch: Manual stopwatch class for measuring intervals
• watch_time: Decorator that prints function execution time

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