Receiving a search intent based on location for diagnostic services nearby and sending a list of diagnostic service options (Node.js)
In this use case, the user simply searches for nearby diagnostic services
Code snippets
BPP receives protocol search
/*
Example Request JSON:
{
"context": {
"domain": "nic2004:85195",
"country": "IND",
"city": "std:080",
"action": "search",
"core_version": "0.9.2",
"bap_id": "https://mock_bap.com/",
"bap_uri": "https://mock_bap.com/beckn/",
"transaction_id": "1239890342",
"message_id": "123793824",
"timestamp": "2021-03-23T10:00:40.065Z"
},
"message": {
"intent": {
"fulfillment": {
"end": {
"location": {
"gps": "12.4535445,77.9283792"
}
}
}
}
}
}
*/
// Auth middleware authenticates the digital signature of the incoming request
router.post('/healthcare_diagnostics/search', auth, search);
function search({ headers, body }, res) {
try {
const message = _.get(body, "message");
const context = _.get(body, "context");
if (!context) {
return res.status(400).send(httpResponse("NACK", "Missing Context"));
}
if (!message) {
return res.status(400).send(httpResponse("NACK", "Missing Message"));
}
// ... Returns the ack immediately and continue the processing after validation
res.status(200).send(httpResponse("ACK"));
processSearch(headers, body)
} catch (error) {
res.status(500).send(httpResponse("NACK", error));
}
};
BPP processes the search
function processSearch(requestHeaders, searchRequestBody) {
// Execute business logic here
let searchResponse = {
}
generateResponse(requestHeaders, searchResponse)
}
BPP generates response
async function generateResponse(requestHeaders, rawResponse){
/*
Example Request JSON :
{
"context": {
"domain": "nic2004:85195",
"country": "IND",
"city": "std:080",
"action": "on_search",
"core_version": "0.9.2",
"bap_id": "https://mock_bap.com/",
"bap_uri": "https://mock_bap.com/beckn/",
"transaction_id": "1239890342",
"message_id": "123793824",
"timestamp": "2021-03-23T10:00:40.065Z"
},
"message": {
"catalog": {
"bpp/descriptor": {
"name": "Lab Chains BPP"
},
"bpp/providers": [
{
"id": "ddrc",
"descriptor": {
"name": "DDRC Labs"
},
"locations": [
{
"id": "ddrc-koramangala",
"gps": "12.9349377,77.6055586"
}
],
"items": [
{
"id": "mri_scan",
"descriptor": {
"name": "MRI Scan"
},
"location_id": "ddrc-koramangala",
"price": {
"currency": "INR",
"value": "4000"
},
"matched": true
},
{
"id": "ct_scan",
"descriptor": {
"name": "CT Scan"
},
"location_id": "ddrc-koramangala",
"price": {
"currency": "INR",
"value": "3000"
},
"matched": true
}
]
},
{
"id": "srs_labs",
"descriptor": {
"name": "SRS Labs"
},
"locations": [
{
"id": "srs-koramangala",
"gps": "12.9349377,77.6055586"
}
],
"items": [
{
"id": "health_checkup",
"descriptor": {
"name": "Preventive health check up and scans"
},
"location_id": "srs-koramangala",
"price": {
"currency": "INR",
"value": "1000"
}
},
{
"id": "pet_ct",
"descriptor": {
"name": "PET-CT Scan"
},
"location_id": "srs-koramangala",
"price": {
"currency": "INR",
"value": "11000"
}
}
]
}
]
}
}
}
*/
//The below code generates the above example JSON.
let onSearchResponseBody = { }
//call protocol on_search
await callOnSearch(requestHeaders, onSearchResponseBody);
}
BPP calls protocol on_search
async function callOnSearch(requestHeaders, onSearchResponseBody) {
// Take the subscriber Id from the header and calls the registry to get the url. If already cached it need not to call again
const uri = await lookup(requestHeaders);
// Construct Header
const headers = constructAuthHeader(); // Auth Header with digital Signature
return axios({ url: `${uri}/healthcare_diagnostics/on_search`, method: "POST", headers, data: onRatingResponseBody });
}