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pokedex is a demonstration of calling third party with python but using redis to cache the response from third-party to reduce load on third party APIs.

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What is Pokedex ?

  • Pokedex uses free pokeapi.co API for searching pokemon related information using pokemon names.
  • ✔️ Uses django web framework with django rest framework pip package.
  • ✔️ Uses docker/docker-compose.
  • ✔️ Uses redis for caching for dramatically reducing load on third party apis and speed improvement.
  • ✔️ Comes with unit tests based on python unit test framework and vcr cassettes for recording request response interactions with pokeapi.co API.
  • ✔️ Load tested with npm loadtest

Call the API:

# get info for pokemon_name pikachu
curl -X GET "http://localhost:5000/pokemon/pikachu" -H  "accept: application/json" -H  "X-CSRFToken: RRJjriTZY4PEWRjiM0NeW5dbobUSB3Sxpv5SZgZj7aiOmxd79d0TgUyCE0wuKGr3"

# get translated info for pokemon_name pikachu
curl -X GET "http://localhost:5000/pokemon/translated/pikachu" -H  "accept: application/json" -H  "X-CSRFToken: RRJjriTZY4PEWRjiM0NeW5dbobUSB3Sxpv5SZgZj7aiOmxd79d0TgUyCE0wuKGr3"

HOW TO BUILD, SPIN, WATCH LOGS, etc

  • Prerequisites:

    • Need docker at-least, so please install docker
    • I am assuming you are using Unix like system.

  • Before running the project add .env.local file at project root directory and copy contents of .env.example file using:

    • cat .env.example | tee .env.local. Note that this command might not work properly on Windows, it's better to create .env.local by hand.

  • Run the project (Using docker-compose):

    • docker-compose up. But remember to add .env.local file at project root directory and copy contents of .env.example file as already mentioned in the first step. Otherwise the build will fail.

    • Run test cases:

      • docker-compose run pokemon_container bash -c "cd project && python3 manage.py test --no-input"

  • Run the project (Using docker commands):

    • Create a network docker network create --driver bridge pokemon_network

    • Run db docker run -dit --rm --network pokemon_network --env-file .env.local -p 5432:5432 --name pokemon_db postgres

    • Run redis docker run -dit --rm -p 6379:6379 --network pokemon_network --name pokemon_redis redis:alpine3.13

    • Build api server docker build -t pokemon_image .

    • Run api server docker run -dit --rm -p 5000:8000 --network pokemon_network --volume (pwd)/project:/home/pokemon/project --name pokemon_container pokemon_image

    • Run tests, docker exec -it pokemon_container bash -c "cd project && python3 manage.py test --no-input --keepdb"

    • Optional commands, use as per need:

      • Stop api server docker container stop pokemon_container
      • Stop db docker container stop pokemon_db
      • Stop redis docker container stop pokemon_redis
      • See logs docker container logs -ft pokemon_container

You can keep the builds for local, development, testing, staging production seperate:

# For local environment, using --build-arg is not required. Build needs `.env.local` file at project root.
docker-compose build backend
OR
docker-compose build --build-arg TARGET_ENV=local backend

# For development environment, Build needs `.env.development` file at project root.
docker-compose build --build-arg TARGET_ENV=development backend

# For testing environment, Build needs `.env.testing` file at project root.
docker-compose build --build-arg TARGET_ENV=testing backend

# For staging environment, Build needs `.env.staging` file at project root.
docker-compose build --build-arg TARGET_ENV=staging backend

# For production environment, Build needs `.env.production` file at project root.
docker-compose build --build-arg TARGET_ENV=production backend

Production checklist

  • add logging
  • add sentry
  • add travis CI
  • do some profiling and load testing
  • use dependabot for keeping dependencies fresh

Load test results

  • Before using caching (100 requests in total, concurrency=10):
ash@Ashishs-MacBook-Pro ~> loadtest -n 100 -k -c 10 http://localhost:5000/pokemon/mewtwo
[Mon Jul 05 2021 07:57:21 GMT+0900 (Japan Standard Time)] INFO Requests: 0 (0%), requests per second: 0, mean latency: 0 ms
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO Target URL:          http://localhost:5000/pokemon/mewtwo
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO Max requests:        100
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO Concurrency level:   10
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO Agent:               keepalive
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO Completed requests:  100
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO Total errors:        0
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO Total time:          3.099425439 s
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO Requests per second: 32
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO Mean latency:        304.7 ms
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO Percentage of the requests served within a certain time
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO   50%      284 ms
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO   90%      428 ms
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO   95%      466 ms
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO   99%      511 ms
[Mon Jul 05 2021 07:57:24 GMT+0900 (Japan Standard Time)] INFO  100%      511 ms (longest request)
  • After using caching (100 requests in total, concurrency=10):
ash@Ashishs-MacBook-Pro ~> loadtest -n 100 -k -c 10 http://localhost:5000/pokemon/mewtwo
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO Requests: 0 (0%), requests per second: 0, mean latency: 0 ms
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO Target URL:          http://localhost:5000/pokemon/mewtwo
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO Max requests:        100
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO Concurrency level:   10
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO Agent:               keepalive
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO Completed requests:  100
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO Total errors:        0
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO Total time:          0.660191959 s
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO Requests per second: 151
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO Mean latency:        61.9 ms
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO Percentage of the requests served within a certain time
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO   50%      24 ms
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO   90%      216 ms
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO   95%      393 ms
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO   99%      407 ms
[Mon Jul 05 2021 08:46:54 GMT+0900 (Japan Standard Time)] INFO  100%      407 ms (longest request)
  • Using cache has improved the mean latency from 304.7 ms to 61.9 ms which is about 5 times faster.
  • Using cache has increase number of requests per second handled by system from 32 requests to 151 requests which is 5 times more.

NOTES

  • comply
  • check if django user in docker really needed
  • manage secrets using .env file
  • add tests as per compliance
  • cache

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pokedex is a demonstration of calling third party with python but using redis to cache the response from third-party to reduce load on third party APIs.

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