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requester.ts
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requester.ts
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import { appendUpdatedEntry, getNextUnresolved, getLocationFromPSGC } from './db';
import { OSMSchema, UpdateData, LocationData } from './models';
async function delay(ms: number) {
return new Promise(resolve => setTimeout(resolve, ms));
}
async function handleGeocodeRequest(query: string, code: string) {
const url = `https://nominatim.openstreetmap.org/search?format=json&q=${encodeURIComponent(query)}`
try {
const response = await fetch(url);
if (!response.ok) {
throw new Error(`Error: ${response.status}`)
}
const [first, ...rest] = await response.json()
if (!first) {
//pattern match next level
const regionLevelPattern = /0{8,}$/
const provinceLevelPattern = /0{5,}$/
const municipalLevelPattern = /0{3,}$/
if (regionLevelPattern.test(code)) {
throw Error("Could not reach high level.");
} else if (provinceLevelPattern.test(code)) {
const parentLocation = await getLocationFromPSGC(code.substring(0,2) + '0'.repeat(8));
const parsedLocation = LocationData.parse(parentLocation);
return OSMSchema.parse(parsedLocation.osmresult);
} else if(municipalLevelPattern.test(code)) {
let parentLocation = await getLocationFromPSGC(code.substring(0,5) + '0'.repeat(5));
if (parentLocation === false) parentLocation = await getLocationFromPSGC(code.substring(0,2) + '0'.repeat(8));
const parsedLocation = LocationData.parse(parentLocation);
return OSMSchema.parse(parsedLocation.osmresult);
} else {
let parentLocation = await getLocationFromPSGC(code.substring(0,7) + '0'.repeat(3));
if (parentLocation === false) parentLocation = await getLocationFromPSGC(code.substring(0,5) + '0'.repeat(5));
if (parentLocation === false) parentLocation = await getLocationFromPSGC(code.substring(0,2) + '0'.repeat(8));
const parsedLocation = LocationData.parse(parentLocation);
return OSMSchema.parse(parsedLocation.osmresult);
}
}
const data = OSMSchema.parse(first);
return data;
} catch (err) {
console.log("Failed to fetch data: ", err);
throw err;
}
}
async function goThroughAll() {
while (true) {
const next = await getNextUnresolved();
if (next === false) break;
const {psgc, longname} = next;
const res = await handleGeocodeRequest(longname, psgc);
const [sLat, nLat, wLong, eLong] = res.boundingbox.map(float => parseFloat(float))
const payload = {
coords: {
type: "Point",
coordinates: [parseFloat(res.lon), parseFloat(res.lat)]
},
boundingBox: {
type: "Polygon",
coordinates: [[wLong, sLat], [wLong, nLat], [eLong, sLat], [eLong, nLat]]
},
osmresult: res,
}
const parsePayload = UpdateData.parse(payload)
const result = await appendUpdatedEntry(parsePayload, psgc);
if (result) console.log(`PSGC: ${psgc} ---> ${res.lon}, ${res.lat}`)
delay(1000);
}
}
goThroughAll()