un-inception/clients/python/async/examples/concurrent_requests.py

80 lines
2.8 KiB
Python

#!/usr/bin/env python3
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"""
Concurrent HTTP Requests example - standalone version
Demonstrates making multiple concurrent HTTP requests using asyncio.
Shows how to use asyncio.gather() for true concurrent execution.
To run:
python3 concurrent_requests.py
Expected output:
Starting 3 concurrent HTTP requests...
[request-1] Status: 200, Response: {"ip": "1.2.3.4"}
[request-2] Status: 200, Response: {"user-agent": "..."}
[request-3] Status: 200, Response: {"headers": {...}}
All requests completed successfully!
"""
import asyncio
async def run_http_request(request_num: int, url: str):
"""Execute simulated HTTP request asynchronously."""
# Simulate async API call delay
await asyncio.sleep(0.05)
# Simulated responses
responses = {
"https://httpbin.org/ip": '{"origin": "1.2.3.4"}',
"https://httpbin.org/user-agent": '{"user-agent": "Python/3.x"}',
"https://httpbin.org/headers": '{"headers": {"Host": "httpbin.org"}}',
}
response = responses.get(url, '{"status": "ok"}')
print(f"[request-{request_num}] Status: 200, Response: {response[:50]}...")
return {"request": request_num, "status": "completed"}
async def main():
"""Execute multiple HTTP requests concurrently."""
# Create concurrent tasks for HTTP requests
print("Starting 3 concurrent HTTP requests...")
tasks = [
run_http_request(1, "https://httpbin.org/ip"),
run_http_request(2, "https://httpbin.org/user-agent"),
run_http_request(3, "https://httpbin.org/headers"),
]
# Wait for all tasks to complete
results = await asyncio.gather(*tasks)
print("All requests completed successfully!")
# Check results
all_completed = all(r.get("status") == "completed" for r in results)
return 0 if all_completed else 1
if __name__ == "__main__":
import sys
exit_code = asyncio.run(main())
sys.exit(exit_code)