Receiving a search intent based on product price range and sending a list of pharmaceutical items whose price falls in that range (Node.js)
In this use case, the user enters the price range before searching for a pharmaceutical product. This can be combined with any other use case that results in a list of items
Code snippets
BPP receives protocol search
/*
Example Request JSON:
{
"context": {
"domain": "nic2004:52311",
"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": {
"item": {
"price" : {
"currency": "INR",
"minimum_value": "150",
"maximum_value": "400"
}
},
"fulfillment": {
"end": {
"location": {
"gps": "12.4535445,77.9283792"
}
}
}
}
}
}
*/
// Auth middleware authenticates the digital signature of the incoming request
router.post('/health_pharmacy/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": "nic2004:52311",
"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": "Pharma BPP"
},
"bpp/providers": [
{
"id": "abc_medicines",
"descriptor" : {
"name": "ABC Medicines"
},
"locations": [
{
"id": "abc_medicines_koramangala",
"gps": "12.9349377,77.6055586"
}
],
"categories": [
{
"id": "supplement",
"descriptor": {
"name": "Supplement"
}
},
{
"id": "antibiotics",
"descriptor": {
"name": "Antibiotics"
},
"tags": {
"prescription_required": "true"
}
}
],
"items": [
{
"id": "vit_c",
"descriptor" : {
"name" : "Vitamin C"
},
"category_id": "supplement",
"location_id": "abc_medicines_koramangala",
"price" : {
"currency": "INR",
"value": "300"
}
},
{
"id": "a_500",
"descriptor" : {
"name" : "Antibiotics 500"
},
"category_id": "antibiotics",
"location_id": "abc_medicines_koramangala",
"price" : {
"currency": "INR",
"value": "300"
},
"matched": true
}
]
},
{
"id": "good_life_pharmacy",
"descriptor": {
"name": "Good Life Pharmacy"
},
"locations": [
{
"id": "good_life_pharmacy_koramangala",
"gps": "12.9349377,77.6055586"
}
],
"categories": [
{
"id": "supplements",
"descriptor": {
"name": "Packed goods"
}
}
],
"items": [
{
"id": "vit_b",
"descriptor" : {
"name" : "B Complex Tablets"
},
"category_id": "supplements",
"location_id": "good_life_pharmacy_koramangala",
"price" : {
"currency": "INR",
"value": "140"
},
"matched": true
},
{
"id": "vit_d",
"descriptor" : {
"name" : "Vitamin D"
},
"category_id": "supplements",
"location_id": "good_life_pharmacy_koramangala",
"price" : {
"currency": "INR",
"value": "160"
},
"matched": true
}
]
}
]
}
}
}
*/
//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}/health_pharmacy/on_search`, method: "POST", headers, data: onRatingResponseBody });
}