feat(price-pusher): allow multiple injective gRPC endpoints with failover

apps/price_pusher/README.md

@@ -118,6 +118,11 @@ pnpm run start injective --grpc-endpoint https://grpc-endpoint.com \
     [--pushing-frequency 10] \
     [--polling-frequency 5]
 
+# `--grpc-endpoint` accepts a fallback set. Pass the flag multiple times or
+# supply a comma-separated list (`--grpc-endpoint a,b`). The pusher cycles
+# round-robin through endpoints when a gRPC call fails — useful for cosmos
+# nodes whose availability can be flaky.
+
 # For Aptos
 pnpm run start aptos --endpoint https://fullnode.testnet.aptoslabs.com/v1 \
     --pyth-contract-address 0x7e783b349d3e89cf5931af376ebeadbfab855b3fa239b7ada8f5a92fbea6b387 \

apps/price_pusher/package.json

@@ -113,6 +113,10 @@
       "default": "./dist/injective/command.cjs",
       "types": "./dist/injective/command.d.ts"
     },
+    "./injective/endpoint-pool": {
+      "default": "./dist/injective/endpoint-pool.cjs",
+      "types": "./dist/injective/endpoint-pool.d.ts"
+    },
     "./injective/injective": {
       "default": "./dist/injective/injective.cjs",
       "types": "./dist/injective/injective.d.ts"
@@ -215,9 +219,10 @@
     "dev": "ts-node src/index.ts",
     "prepublishOnly": "pnpm run build",
     "start": "node dist/index.cjs",
-    "test:types": "tsc"
+    "test:types": "tsc",
+    "test:unit": "test-unit"
   },
   "type": "module",
   "types": "./dist/index.d.ts",
-  "version": "10.4.0"
+  "version": "10.5.0"
 }

apps/price_pusher/src/injective/command.ts

@@ -20,10 +20,14 @@ export default {
   builder: {
     "grpc-endpoint": {
       description:
-        "gRPC endpoint URL for injective. The pusher will periodically" +
+        "gRPC endpoint URL(s) for injective. The pusher will periodically " +
         "poll for updates. The polling interval is configurable via the " +
-        "`polling-frequency` command-line argument.",
-      type: "string",
+        "`polling-frequency` command-line argument. " +
+        "Pass the flag multiple times or supply a comma-separated list " +
+        "(e.g. `--grpc-endpoint a,b`) to register a fallback set; the " +
+        "pusher will round-robin through them on gRPC errors.",
+      type: "array",
+      string: true,
       required: true,
     } as Options,
     network: {
@@ -86,6 +90,20 @@ export default {
     });
     const mnemonic = fs.readFileSync(mnemonicFile, "utf8").trim();
 
+    // `grpc-endpoint` is `type: "array"` so yargs always hands us a list. Each
+    // entry may itself be a comma-separated string (e.g. `--grpc-endpoint a,b`),
+    // so split + trim + drop empties to get a clean failover set.
+    const grpcEndpoints: string[] = (grpcEndpoint as string[])
+      .flatMap((entry) => entry.split(","))
+      .map((entry) => entry.trim())
+      .filter((entry) => entry.length > 0);
+    if (grpcEndpoints.length === 0) {
+      throw new Error(
+        "At least one --grpc-endpoint must be provided. Pass the flag once per " +
+          "endpoint, or supply a comma-separated list.",
+      );
+    }
+
     let priceItems = priceConfigs.map(({ id, alias }) => ({ id, alias }));
 
     // Better to filter out invalid price items before creating the pyth listener
@@ -110,7 +128,7 @@ export default {
 
     const injectiveListener = new InjectivePriceListener(
       pythContractAddress,
-      grpcEndpoint,
+      grpcEndpoints,
       priceItems,
       logger.child({ module: "InjectivePriceListener" }),
       {
@@ -120,7 +138,7 @@ export default {
     const injectivePusher = new InjectivePricePusher(
       hermesClient,
       pythContractAddress,
-      grpcEndpoint,
+      grpcEndpoints,
       logger.child({ module: "InjectivePricePusher" }),
       mnemonic,
       {

apps/price_pusher/src/injective/endpoint-pool.ts

@@ -0,0 +1,67 @@
+import type { Logger } from "pino";
+
+/**
+ * Round-robin cursor over a non-empty list of gRPC endpoints. Each call site
+ * rents the current endpoint, and the cursor advances when an attempt fails
+ * (see `withEndpointFailover`). The cursor is shared across every gRPC API
+ * helper inside a single pusher instance so that a bad endpoint affects the
+ * whole pusher, not just one method.
+ */
+export class EndpointPool {
+  private currentIndex = 0;
+
+  constructor(
+    private readonly endpoints: readonly string[],
+    private readonly logger: Logger,
+  ) {
+    if (endpoints.length === 0) {
+      throw new Error("EndpointPool requires at least one endpoint");
+    }
+  }
+
+  current(): string {
+    // Non-null asserted: the constructor guarantees length >= 1 and `rotate`
+    // always wraps the index modulo `endpoints.length`.
+
+    return this.endpoints[this.currentIndex]!;
+  }
+
+  rotate(reason: unknown): string {
+    if (this.endpoints.length === 1) {
+      return this.current();
+    }
+    const failed = this.current();
+    this.currentIndex = (this.currentIndex + 1) % this.endpoints.length;
+    this.logger.warn(
+      { failedEndpoint: failed, nextEndpoint: this.current(), err: reason },
+      "gRPC endpoint failed — rotating to next endpoint",
+    );
+    return this.current();
+  }
+
+  size(): number {
+    return this.endpoints.length;
+  }
+}
+
+/**
+ * Try `fn` against the current endpoint; on failure, rotate to the next
+ * endpoint and retry. Walks through every endpoint at most once before
+ * re-throwing the last error.
+ */
+export async function withEndpointFailover<T>(
+  pool: EndpointPool,
+  fn: (endpoint: string) => Promise<T>,
+): Promise<T> {
+  let lastError: unknown;
+  for (let attempt = 0; attempt < pool.size(); attempt++) {
+    const endpoint = pool.current();
+    try {
+      return await fn(endpoint);
+    } catch (error) {
+      lastError = error;
+      pool.rotate(error);
+    }
+  }
+  throw lastError;
+}

apps/price_pusher/src/injective/injective.ts

@@ -21,6 +21,7 @@ import type { Logger } from "pino";
 import type { PriceItem, PriceInfo, IPricePusher } from "../interface.js";
 import { ChainPriceListener } from "../interface.js";
 import type { DurationInSeconds } from "../utils.js";
+import { EndpointPool, withEndpointFailover } from "./endpoint-pool.js";
 
 const DEFAULT_GAS_PRICE = 160_000_000;
 const DEFAULT_GAS_MULTIPLIER = 1.05;
@@ -48,31 +49,43 @@ type InjectiveConfig = {
 
 // this use price without leading 0x
 export class InjectivePriceListener extends ChainPriceListener {
+  private readonly endpoints: EndpointPool;
+
   constructor(
     private pythContractAddress: string,
-    private grpcEndpoint: string,
+    grpcEndpoints: string | readonly string[],
     priceItems: PriceItem[],
     private logger: Logger,
     config: {
       pollingFrequency: DurationInSeconds;
     },
   ) {
     super(config.pollingFrequency, priceItems);
+    this.endpoints = new EndpointPool(
+      typeof grpcEndpoints === "string" ? [grpcEndpoints] : grpcEndpoints,
+      logger,
+    );
   }
 
   async getOnChainPriceInfo(
     priceId: HexString,
   ): Promise<PriceInfo | undefined> {
     let priceQueryResponse: PriceQueryResponse;
     try {
-      const api = new ChainGrpcWasmApi(this.grpcEndpoint);
-      const { data } = await api.fetchSmartContractState(
-        this.pythContractAddress,
-        Buffer.from(`{"price_feed":{"id":"${priceId}"}}`).toString("base64"),
+      priceQueryResponse = await withEndpointFailover(
+        this.endpoints,
+        async (endpoint) => {
+          const api = new ChainGrpcWasmApi(endpoint);
+          const { data } = await api.fetchSmartContractState(
+            this.pythContractAddress,
+            Buffer.from(`{"price_feed":{"id":"${priceId}"}}`).toString(
+              "base64",
+            ),
+          );
+          const json = Buffer.from(data).toString();
+          return JSON.parse(json) as PriceQueryResponse;
+        },
       );
-
-      const json = Buffer.from(data).toString();
-      priceQueryResponse = JSON.parse(json);
     } catch (error) {
       this.logger.error(error, `Polling on-chain price for ${priceId} failed.`);
       return undefined;
@@ -96,11 +109,12 @@ export class InjectivePricePusher implements IPricePusher {
   private mnemonic: string;
   private chainConfig: InjectiveConfig;
   private accounts: Record<string, Account | undefined> = {};
+  private readonly endpoints: EndpointPool;
 
   constructor(
     private hermesClient: HermesClient,
     private pythContractAddress: string,
-    private grpcEndpoint: string,
+    grpcEndpoints: string | readonly string[],
     private logger: Logger,
     mnemonic: string,
     chainConfig?: Partial<InjectiveConfig>,
@@ -114,6 +128,10 @@ export class InjectivePricePusher implements IPricePusher {
         chainConfig?.priceIdsProcessChunkSize ??
         DEFAULT_PRICE_IDS_PROCESS_CHUNK_SIZE,
     };
+    this.endpoints = new EndpointPool(
+      typeof grpcEndpoints === "string" ? [grpcEndpoints] : grpcEndpoints,
+      logger,
+    );
   }
 
   private getWallet(index: number) {
@@ -131,13 +149,15 @@ export class InjectivePricePusher implements IPricePusher {
     msg: Msgs,
     index: number,
   ): Promise<TxResponse> {
-    const chainGrpcAuthApi = new ChainGrpcAuthApi(this.grpcEndpoint);
     const wallet = this.getWallet(index);
     const injectiveAddress = wallet.toAddress().toBech32();
 
     // Fetch the latest account details only if it's not stored.
-    this.accounts[injectiveAddress] ??=
-      await chainGrpcAuthApi.fetchAccount(injectiveAddress);
+    this.accounts[injectiveAddress] ??= await withEndpointFailover(
+      this.endpoints,
+      (endpoint) =>
+        new ChainGrpcAuthApi(endpoint).fetchAccount(injectiveAddress),
+    );
 
     const account = this.accounts[injectiveAddress];
 
@@ -158,8 +178,9 @@ export class InjectivePricePusher implements IPricePusher {
       txRaw.signatures = [sig];
 
       // this takes approx 5 seconds
-      const txResponse = await new TxGrpcApi(this.grpcEndpoint).broadcast(
-        txRaw,
+      const txResponse = await withEndpointFailover(
+        this.endpoints,
+        (endpoint) => new TxGrpcApi(endpoint).broadcast(txRaw),
       );
 
       account.baseAccount.sequence++;
@@ -272,8 +293,8 @@ export class InjectivePricePusher implements IPricePusher {
     });
 
     try {
-      const result = await new TxGrpcApi(this.grpcEndpoint).simulate(
-        simulateTxRaw,
+      const result = await withEndpointFailover(this.endpoints, (endpoint) =>
+        new TxGrpcApi(endpoint).simulate(simulateTxRaw),
       );
 
       const gas = (
@@ -327,22 +348,24 @@ export class InjectivePricePusher implements IPricePusher {
    */
   private async getUpdateFee(vaas: string[]) {
     try {
-      const api = new ChainGrpcWasmApi(this.grpcEndpoint);
-      const { data } = await api.fetchSmartContractState(
-        this.pythContractAddress,
-        Buffer.from(
-          JSON.stringify({
-            get_update_fee: {
-              vaas,
-            },
-          }),
-        ).toString("base64"),
-      );
-
-      const json = Buffer.from(data).toString();
-
-      // eslint-disable-next-line @typescript-eslint/no-unsafe-return
-      return JSON.parse(json);
+      return await withEndpointFailover(this.endpoints, async (endpoint) => {
+        const api = new ChainGrpcWasmApi(endpoint);
+        const { data } = await api.fetchSmartContractState(
+          this.pythContractAddress,
+          Buffer.from(
+            JSON.stringify({
+              get_update_fee: {
+                vaas,
+              },
+            }),
+          ).toString("base64"),
+        );
+
+        const json = Buffer.from(data).toString();
+
+        // eslint-disable-next-line @typescript-eslint/no-unsafe-return
+        return JSON.parse(json);
+      });
     } catch (error) {
       this.logger.error(error, `Error fetching update fee.`);