[price-service] Make gap metrics more accurate (#426)

* [price-service] Make gap metrics more accurate
* Bump version to 2.2.3

third_party/pyth/price-service/package-lock.json

@@ -1,12 +1,12 @@
 {
   "name": "@pythnetwork/pyth-price-service",
-  "version": "2.2.2",
+  "version": "2.2.3",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@pythnetwork/pyth-price-service",
-      "version": "2.2.2",
+      "version": "2.2.3",
       "license": "Apache-2.0",
       "dependencies": {
         "@certusone/wormhole-sdk": "^0.1.4",

third_party/pyth/price-service/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@pythnetwork/pyth-price-service",
-  "version": "2.2.2",
+  "version": "2.2.3",
   "description": "Pyth Price Service",
   "main": "index.js",
   "scripts": {

third_party/pyth/price-service/src/listen.ts

@@ -155,6 +155,28 @@ export class Listener implements PriceStore {
     }
   }
 
+  isNewPriceInfo(
+    cachedInfo: PriceInfo | undefined,
+    observedInfo: PriceInfo
+  ): boolean {
+    if (cachedInfo === undefined) {
+      return true;
+    }
+
+    if (cachedInfo.attestationTime < observedInfo.attestationTime) {
+      return true;
+    }
+
+    if (
+      cachedInfo.attestationTime === observedInfo.attestationTime &&
+      cachedInfo.seqNum < observedInfo.seqNum
+    ) {
+      return true;
+    }
+
+    return false;
+  }
+
   async processVaa(vaa: Buffer) {
     const { parse_vaa } = await importCoreWasm();
 
@@ -184,32 +206,9 @@ export class Listener implements PriceStore {
       return;
     }
 
-    const isAnyPriceNew = batchAttestation.priceAttestations.some(
-      (priceAttestation) => {
-        const key = priceAttestation.priceId;
-        const lastAttestationTime =
-          this.priceFeedVaaMap.get(key)?.attestationTime;
-        return (
-          lastAttestationTime === undefined ||
-          lastAttestationTime < priceAttestation.attestationTime
-        );
-      }
-    );
-
-    if (!isAnyPriceNew) {
-      return;
-    }
-
     for (const priceAttestation of batchAttestation.priceAttestations) {
       const key = priceAttestation.priceId;
 
-      const lastAttestationTime =
-        this.priceFeedVaaMap.get(key)?.attestationTime;
-
-      if (
-        lastAttestationTime === undefined ||
-        lastAttestationTime < priceAttestation.attestationTime
-      ) {
       const priceFeed = priceAttestationToPriceFeed(priceAttestation);
       const priceInfo = {
         seqNum: parsedVaa.sequence,
@@ -220,19 +219,18 @@ export class Listener implements PriceStore {
         emitterChainId: parsedVaa.emitter_chain,
         priceServiceReceiveTime: Math.floor(new Date().getTime() / 1000),
       };
+
+      const cachedPriceInfo = this.priceFeedVaaMap.get(key);
+
+      if (this.isNewPriceInfo(cachedPriceInfo, priceInfo)) {
         this.priceFeedVaaMap.set(key, priceInfo);
 
-        if (lastAttestationTime !== undefined) {
+        if (cachedPriceInfo !== undefined) {
           this.promClient?.addPriceUpdatesAttestationTimeGap(
-            priceAttestation.attestationTime - lastAttestationTime
+            priceAttestation.attestationTime - cachedPriceInfo.attestationTime
           );
-        }
-
-        const lastPublishTime = this.priceFeedVaaMap.get(key)?.publishTime;
-
-        if (lastPublishTime !== undefined) {
           this.promClient?.addPriceUpdatesPublishTimeGap(
-            priceAttestation.publishTime - lastPublishTime
+            priceAttestation.publishTime - cachedPriceInfo.publishTime
           );
         }