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example-apps

Introduction

Example applications based on EdgeGallery

How to develop an example application

1.Consumer application can easily integrate with MEP/MEP-AGENT to obtain producer application services

2.Every consumer application should be writing 2 to 3 lines of code to acheive this functionality

3.Mep-agent should expose an API’s to get token and service endpoint

4.Consumer application uses consumer client to perform CRUD operations.

5.Example consumer application can leverage mep-agent and consumerclient to communicate with mep-service via kong

6.ClientFactory code is implemented to send request to mep-agent to get service endpoint and based on endpoint information will create a client object

def get_service_endpoint(service):

url = restclient.mep_agent_url + "/mep-agent/v1/endpoint/{0}".format(service)
headers = {'Content-Type': "application/json"}
if restclient.ssl_enabled:
    url = restclient.httpsUrl + url
    response = requests.get(url, headers=headers, verify=restclient.ssl_cacertpath)
else:
    url = restclient.httpUrl + url
    response = requests.get(url, headers=headers)
# extracting data in json format
if response:
    data = response.json()
    url = data["uris"]
    return url[0]
else:
    return ""

class ClientFactory:

#  constructor
def __init__(self, list_of_services):
    self.update_client_object(list_of_services)
def update_client_object(self, list_of_services):
    for service in list_of_services:
        endpoint = get_service_endpoint(service)
        if endpoint != "" and "http" in endpoint or "https" in endpoint:
                clientObjects[service] = restclient.RestClient(endpoint)
def get_client_by_service_name(self, service):
    return clientObjects[service]

7.Consumerclient code is implemented to get access token and send request to mep service via kong

def get_access_token():

url = mep_agent_url + "/mep-agent/v1/token"
headers = {'Content-Type': contentType}
if ssl_enabled:
    url = httpsUrl + url
    response = requests.get(url, headers=headers, verify=ssl_cacertpath)
else:
    url = httpUrl + url
    response = requests.get(url, headers=headers)
# extracting data in json format
data = response.json()
access_token = data["access_token"]
return access_token

class RestClient:

# rest client constructor
def __init__(self, endpoint):
    self.endpoint = endpoint
def post(self, url, body=None, upload_files=None):
    access_token = get_access_token()
    access_token = "Bearer " + access_token
    headers = {'Authorization': access_token}
    response = requests.post(url, data=body, files=upload_files, headers=headers, verify=False)
    return response
def delete(self, url):
    access_token = get_access_token()
    access_token = "Bearer " + access_token
    headers = {'Authorization': access_token}
    response = requests.delete(url, headers=headers, verify=False)
    return response
def get_endpoint(self):
    return self.endpoint

8.Application code is implemented to send request to consumer client for communicating with mep service via kong api gateway

rest_client = clientFactory.get_client_by_service_name(constants.face_recognition_service)
url = rest_client.get_endpoint() + "/v1/face-recognition/recognition"
response = rest_client.post(url, body)