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routes.js
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routes.js
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const request = require('request');
// please specify your own credential
const client_id = '';
const client_secret = '';
const apiKey = '';
const featureServerUrl = '';
// Fix Url
const epaUrl = `https://gateway.api.epa.vic.gov.au/environmentMonitoring/v1/sites?environmentalSegment=air`;
const oauth2Url = 'https://www.arcgis.com/sharing/rest/oauth2/token/';
const featureServerUrlApplyEdit = `${featureServerUrl}/applyEdits`;
const requestToken = () =>
// generate a token with client id and client secret
new Promise((resolve, reject) => {
request.post(
{
url: oauth2Url,
json: true,
form: {
f: 'json',
client_id,
client_secret,
grant_type: 'client_credentials',
expiration: '1440'
}
},
function (error, response, { access_token }) {
if (error) reject(error);
resolve(access_token);
}
);
});
const getEpaSites = () =>
new Promise((resolve, reject) => {
request(
{
url: epaUrl,
headers: {
'Content-Type': 'application/json',
'x-api-key': apiKey,
},
method: 'GET',
encoding: null
},
function (error, res, body) {
if (res.statusCode == 200 && !error) {
resolve(JSON.parse(body));
}
reject(error);
}
);
});
const getArcGisSites = (token) =>
new Promise((resolve, reject) => {
request(
{
url: `${featureServerUrl}/query?token=${token}&where=1%3D1&f=json&outFields=OBJECTID, siteID, siteName`,
headers: {},
method: 'GET',
encoding: null
},
function (error, res, body) {
if (res.statusCode == 200 && !error) {
resolve(JSON.parse(body));
}
reject(error);
}
);
});
const updateArcGisSitesFeature = (updatedSites, token) =>
new Promise((resolve, reject) => {
const updates = updatedSites.map(data => {
return {
attributes: {
OBJECTID: data.objectId,
siteName: data.siteName,
siteType: data.siteType,
since: data.since,
until: data.until,
healthParameter: data.healthParameter,
healthAdvice: data.healthAdvice,
averageValue: data.averageValue
}
};
});
request.post(
{
url: featureServerUrlApplyEdit,
json: true,
formData: {
updates: JSON.stringify(updates),
f: 'json',
token: token
}
},
function (error, response, body) {
if (response.statusCode == 200 && !error) {
resolve(`sites has been updated successfuly.`);
}
reject(error);
}
);
});
const addArcGisSitesFeature = (newSites, token) =>
new Promise((resolve, reject) => {
const adds = newSites.map(data => {
return {
geometry: {
"x": data.geometry.lat,
"y": data.geometry.lon,
"spatialReference": {
"wkid": 4326
}
},
attributes: {
siteId: data.siteId,
siteName: data.siteName,
siteType: data.siteType,
since: data.since,
until: data.until,
healthParameter: data.healthParameter,
healthAdvice: data.healthAdvice,
averageValue: data.averageValue
}
};
});
request.post(
{
url: featureServerUrlApplyEdit,
json: true,
formData: {
adds: JSON.stringify(adds),
f: 'json',
token: token
}
},
function (error, response, body) {
if (response.statusCode == 200 && !error) {
resolve(`new sites has been added successfully.`);
}
reject(error);
}
);
});
const deleteArcGisSitesFeature = (objectIds, token) => {
return new Promise((resolve, reject) => {
request.post(
{
url: featureServerUrlApplyEdit,
json: true,
formData: {
deletes: JSON.stringify(objectIds),
f: 'json',
token: token
}
},
function (error, response, body) {
if (response.statusCode == 200 && !error) {
resolve(`offline sites has been deleted successfully`);
}
reject(error);
}
);
});
}
const appRouter = app => {
app.get('/', async (req, res) => {
console.log("Synchronization started.")
try {
let updatedSites = [];
let newSites = [];
let dropSites = [];
//1. Request tokens from ArcGIS online
const token = await requestToken();
console.log(`token: ${token}`);
//2- get all station data (siteId and the values)
const epaSites = await getEpaSites();
const arcGisSites = await getArcGisSites(token);
//3- loop all epa sites to get all updated sites and new sites
for (const epaSite of epaSites.records) {
if (!epaSite.siteHealthAdvices) continue;
const featureData = {
OBJECTID: 0,
siteId: epaSite.siteID,
siteName: epaSite.siteName,
siteType: epaSite.siteType,
since: epaSite.siteHealthAdvices[0].since,
until: epaSite.siteHealthAdvices[0].until,
healthParameter: epaSite.siteHealthAdvices[0].healthParameter,
healthAdvice: epaSite.siteHealthAdvices[0].healthAdvice,
averageValue: epaSite.siteHealthAdvices[0].averageValue,
geometry: {
lon: epaSite.geometry.coordinates[0],
lat: epaSite.geometry.coordinates[1]
}
};
const existingSite = arcGisSites.features.find(site => site.attributes.siteID === featureData.siteId);
if (existingSite) {
featureData.OBJECTID = existingSite.attributes.OBJECTID;
updatedSites.push(featureData);
} else {
console.log(`${featureData.siteName} is a new site (to be added)`);
newSites.push(featureData);
}
}
for (const site of arcGisSites.features) {
if (!epaSites.records.find(x => x.siteID === site.attributes.siteID)) {
console.log(`${site.attributes.siteName} has been offlined (to be removed).`);
dropSites.push(site.attributes.OBJECTID);
}
}
const updateResult = await updateArcGisSitesFeature(updatedSites, token);
console.log(`${updatedSites.length} ${updateResult}`);
if (newSites.length > 0) {
const addResult = await addArcGisSitesFeature(newSites, token);
console.log(`${newSites.length} ${addResult}`);
}
if (dropSites.length > 0) {
const removeResult = await deleteArcGisSitesFeature(dropSites, token);
console.log(`${dropSites.length} ${removeResult}`);
}
res.status(200).send('Synchronization completed.');
return;
} catch (error) {
console.log(error);
}
});
};
module.exports = appRouter;