perf: batch gateway submits and isolate callbacks

api/src/dictionaries/phone-routing-lookup.service.ts

@@ -22,18 +22,25 @@ export class PhoneRoutingLookupService {
   }
 
   async identifyProvince(phoneNumber: string) {
-    const prefixes = phonePrefixes(phoneNumber);
-    if (prefixes.length === 0) return null;
+    return (await this.identifyProvinces([phoneNumber])).get(phoneNumber) ?? null;
+  }
+
+  async identifyProvinces(phoneNumbers: string[]) {
+    const uniquePhones = [...new Set(phoneNumbers)];
+    const prefixesByPhone = new Map(uniquePhones.map((phone) => [phone, phonePrefixes(phone)]));
+    const prefixes = [...new Set([...prefixesByPhone.values()].flat())];
+    if (prefixes.length === 0) return new Map(uniquePhones.map((phone) => [phone, null]));
     const segments = await this.prisma.phoneSegment.findMany({
       where: { prefix: { in: prefixes } },
       select: { prefix: true, province: true },
     });
     const provinceByPrefix = new Map(segments.map((segment) => [segment.prefix, segment.province]));
-    for (const prefix of prefixes) {
-      const province = provinceByPrefix.get(prefix);
-      if (province) return province;
-    }
-    return null;
+    return new Map(uniquePhones.map((phone) => {
+      const province = (prefixesByPhone.get(phone) ?? [])
+        .map((prefix) => provinceByPrefix.get(prefix))
+        .find((value): value is string => Boolean(value)) ?? null;
+      return [phone, province];
+    }));
   }
 
   invalidateCarrierRules() {