# example-apps

**Repository Path**: xudan16/example-apps

## Basic Information

- **Project Name**: example-apps
- **Description**: Example applications based on EdgeGallery
- **Primary Language**: Python
- **License**: Apache-2.0
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 15
- **Created**: 2021-03-15
- **Last Updated**: 2021-03-15

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# example-apps

#### 介绍
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 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)