pip install -r requirements.txt
Run with:
twistd -y service.py --pidfile service.pid --logfile service.log
Stop with:
kill $(cat service.pid)
Logs are in service.log
It will start daemon on port 8080 and export two resources:
http://127.0.0.1:8080/service/method
http://127.0.0.1:8080/callback.service/method
Any arguments to service/method will be forwarded to corresponding backend service (see The "backend").
Backend method URL is hardcoded to be:
http://localhost:8081/backend-service/method
Run with:
twistd -y backend.py --pidfile backend.pid --logfile backend.log
Stop with:
kill $(cat backend.pid)
Logs are in backend.log
It will start a daemon on port 8081 and export one resource:
http://127.0.0.1:8081/backend-service/method?delay=5
"delay" is optional, specifies number of seconds until backend will do a POST to callback url. Callback url is hardcoded to be:
http://localhost:8080/callback.service/method
http://127.0.0.1:8080/service/method
Will immediately produce correct output, i.e:
HTTP/1.1 200 OK
{"timestamp": "2015-10-17T19:31:37.889072", "response": "dummy data for request f4403754-c6cc-41ba-a8ed-aebaf7fc515d"}
http://127.0.0.1:8080/service/method?delay=10
Any delay bigger than 5 (hardcoded TIMEOUT value) would result in:
HTTP/1.1 503 Service Unavailable
Response took longer than 5 sec, cancelled. Please try again later.
If backend is not running or unreachable, then any requests would produce something like:
HTTP/1.1 503 Service Unavailable
Backend failed with: Connection was refused by other side: 61: Connection refused.
http://127.0.0.1:8080/service/method?delay=xyz
Specifying non-integer value for delay would make backend fail:
HTTP/1.1 502 Bad Gateway
Backend failed with: Delay is not a number
On my MacBook Pro, its something around 320 requests per second with 50 threads concurrency. Transport turnaround time ranges from 50 to 500 ms.
Memory usage never exceeds 25 mb per process.
$ ab -c 50 -t 15 http://127.0.0.1:8080/service/method?delay=0
This is ApacheBench, Version 2.3 <$Revision: 1663405 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Benchmarking 127.0.0.1 (be patient)
Finished 4871 requests
Server Software: TwistedWeb/15.4.0
Server Hostname: 127.0.0.1
Server Port: 8080
Document Path: /service/method?delay=0
Document Length: 118 bytes
Concurrency Level: 50
Time taken for tests: 15.017 seconds
Complete requests: 4871
Failed requests: 0
Total transferred: 1100846 bytes
HTML transferred: 574778 bytes
Requests per second: 324.37 [#/sec] (mean)
Time per request: 154.147 [ms] (mean)
Time per request: 3.083 [ms] (mean, across all concurrent requests)
Transfer rate: 71.59 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.3 0 2
Processing: 35 153 49.8 164 549
Waiting: 35 153 49.6 164 549
Total: 35 154 49.9 164 549
Percentage of the requests served within a certain time (ms)
50% 164
66% 171
75% 175
80% 177
90% 183
95% 189
98% 199
99% 438
100% 549 (longest request)
To run tests:
trial src
Sample result:
$ trial src
src.tests.test_callback_resource
CallbackResourceTest
test_no_request_id ... [OK]
test_success ... [OK]
test_unknown_request_id ... [OK]
src.tests.test_exported_resource
ExportedResourceTest
test_success ... [OK]
-------------------------------------------------------------------------------
Ran 4 tests in 0.003s
PASSED (successes=4)