add docker rest api agent

docker agent for api-agent #121
* support for node creation, start, stop, restart, deletion

Signed-off-by: Dixing (Dex) Xu <dixingxu@gmail.com>

src/agent/docker-rest-agent/README.md

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+## Pre-requisite

src/agent/docker-rest-agent/requirements.txt

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+Flask
+flask-restful
+requests

src/agent/docker-rest-agent/server.py

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+from flask import Flask, jsonify, request
+import docker
+import sys
+import logging
+
+app = Flask(__name__)
+
+client = docker.from_env()
+res = {'code': 'OK', 'data': {}, 'msg': ''}
+
+@app.route('/api/v1/networks', methods=['GET'])
+def get_network():
+    return jsonify({'networks': client.containers.list()})
+
+@app.route('/api/v1/nodes', methods=['POST'])
+def create_node():
+    msp = request.form.get('msp')
+    tls = request.form.get('tls')
+    bootstrap_block = request.form.get('bootstrap_block')
+    peer_config_file = request.form.get('peer_config_file')
+    orderer_config_file = request.form.get('orderer_config_file')
+    img = request.form.get('img', default='yeasy/hyperledger-fabric:2.2.0')
+    cmd = request.form.get('cmd', default='bash /tmp/init.sh')
+    name_tag = request.form.get('name', 'cello-hlf-peer')
+
+    env = {
+    'HLF_NODE_MSP':msp,
+    'HLF_NODE_TLS':tls,
+    'HLF_NODE_BOOTSTRAP_BLOCK':bootstrap_block,
+    'HLF_NODE_PEER_CONFIG':peer_config_file,
+    'HLF_NODE_ORDERER_CONFIG':orderer_config_file,
+    }
+
+
+    try:
+        # same as `docker run -dit yeasy/hyperledge-fabric:2.2.0 -e VARIABLES``
+        container = client.containers.run(img, cmd, detach=True, tty=True, stdin_open=True, name=name_tag, environment=env) 
+    except:
+        res['code'] = 'Fail'
+        res['data'] = sys.exc_info()[0]
+        res['msg'] = 'failed'
+        logging.debug(res)
+        raise
+    res['data']['status'] = 'created'
+    res['data']['id'] = container.id
+    res['data']['public-grpc'] = '127.0.0.1:7050'
+    res['data']['public-raft'] = '127.0.0.1:7052'
+    return res
+
+@app.route('/api/v1/nodes/<id>', methods=['GET', 'POST'])
+def operate_node(id):
+
+    if request.method == 'POST':
+        act = request.form.get('action', 'start')
+    else:
+        act = request.args.get('action')
+    container = client.containers.get(id)
+
+    if act == 'start':
+        try:
+            container.start()
+        except:
+            res['code'] = 'Fail'
+            res['data'] = sys.exc_info()[0]
+            res['msg'] = 'start failed'
+            logging.debug(res)
+            raise
+        res['data']['status'] = 'started'
+    elif act == 'restart':
+        try:
+            container.restart()
+        except:
+            res['code'] = 'Fail'
+            res['data'] = sys.exc_info()[0]
+            res['msg'] = 'restart failed'
+            logging.debug(res)
+            raise
+        res['data']['status'] = 'restarted'
+    elif act == 'stop':
+        try:
+            container.stop()
+        except:
+            res['code'] = 'Fail'
+            res['data'] = sys.exc_info()[0]
+            res['msg'] = 'stop failed'
+            logging.debug(res)
+            raise
+        res['data']['status'] = 'stopped'
+    elif act == 'delete':
+        try:
+            container.remove()
+        except:
+            res['code'] = 'Fail'
+            res['data'] = sys.exc_info()[0]
+            res['msg'] = 'delete failed'
+            logging.debug(res)
+            raise
+        res['data']['status'] = 'deleted'
+    elif act == 'query':
+        try:
+            res['data']['status'] = container.status()
+        except:
+            res['code'] = 'Fail'
+            res['data'] = sys.exc_info()[0]
+            res['msg'] = 'query failed'
+            logging.debug(res)
+            raise
+    else:
+        res['msg'] = 'undefined action'
+
+
+    return res
+
+
+if __name__ == '__main__':
+    app.run(port=5001, debug=True)