Hyperledger

이번에는 REST API 서버를 만들고 Flask 웹어플리케이션으로 접속하는 실습을 하겠다.

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REST API 어플리케이션 만들기

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root@client:~/pyApp# mkdir myAPI
root@client:~/pyApp# cd myAPI/
root@client:~/pyApp/myAPI# vi api.py

​from flask import Flask, jsonify
from flask_restful import Api, Resource
import json
import os
import sys
import subprocess

app = Flask(__name__)
api = Api(app)

class UserAPI(Resource):
    def get(self, userid):
        print(userid)
        result = subprocess.check_output ('FABRIC_CFG_PATH=/root/hyperledger/fabric-samples/first-network/ docker exec cli scripts/query-users.sh '+userid , shell=True)
        print(result)
        userinfo = json.loads(result)
        return jsonify(userinfo)

    def put(self, userid):
        pass

    def delete(self, userid):
        pass

api.add_resource(UserAPI, '/users/<string:userid>', endpoint = 'user')

if __name__ == '__main__':
    app.debug = True
    app.run(host='0.0.0.0', port=3000)

root@client:~/pyApp/myAPI# python api.py
 * Serving Flask app "api" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Running on http://127.0.0.1:3000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 301-791-187 

root@client:~/pyApp/myAPI# curl  localhost:3000/users/admin
{
  "AP": "0",
  "CC": "0",
  "NM": "LeeJinKwan",
  "PN": "0",
  "PW": "1234"
} 

Flask 웹어플리케이션 만들기

root@client:~/pyApp/myAPI# cd ..
root@client:~/pyApp# mkdir -p myPS/templates
root@client:~/pyApp# vi app.py 

from flask import Flask, render_template
import requests
import json

app = Flask(__name__)

@app.route('/')
def hello():
    return render_template('hello.html' )

@app.route('/user/<userid>')
def user(userid):
    userinfo = dict()
    url = "http://192.168.0.105:3000/users/"+userid
    try :
        r = requests.get(url)
        if(r.status_code == 200) :
            userinfo = json.loads(r.content)
    except :
        pass
    print(userinfo)

    return render_template('user_read.html', userid=userid, userinfo=userinfo)

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=8000,debug=True)
~ 

Flask 웹어플리케이션을 실행한다.

root@client:~/pyApp/myPS# python app.py
 * Serving Flask app "app" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Running on http://0.0.0.0:8000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 301-791-187

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웹브라우저로 확인한다

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Flask 웹어플리케이션 로그에서 정보를 확인할 수 있다.

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​​{u'CC': u'0', u'AP': u'0', u'PN': u'0', u'NM': u'LeeJinKwan', u'PW': u'1234'}
192.168.0.101 - - [01/Dec/2019 13:12:52] "GET /users/admin HTTP/1.1" 200 -