fix: only setup uniswap oracle if pool is initialized

yarn-project/ethereum/src/contracts/fee_asset_price_oracle.ts

@@ -34,12 +34,25 @@ export class FeeAssetPriceOracle {
 
   @memoize
   async getUniswapOracle(): Promise<UniswapPriceOracle | undefined> {
-    if ((await this.client.getCode({ address: STATE_VIEW_ADDRESS.toString() })) === '0x') {
+    const code = await this.client.getCode({ address: STATE_VIEW_ADDRESS.toString() });
+    if (code === undefined || code === '0x') {
       this.log.warn('Uniswap V4 StateView contract not found, skipping fee asset price oracle');
       return undefined;
     }
     this.log.info('Uniswap V4 StateView contract found, initializing fee asset price oracle');
-    return new UniswapPriceOracle(this.client, this.log);
+    const oracle = new UniswapPriceOracle(this.client, this.log);
+
+    try {
+      if (!(await oracle.isPoolInitialized())) {
+        this.log.warn('Uniswap V4 pool not initialized, skipping fee asset price oracle');
+        return undefined;
+      }
+    } catch (err) {
+      this.log.warn(`Failed to check if Uniswap V4 pool is initialized: ${err}`);
+      return undefined;
+    }
+
+    return oracle;
   }
 
   /**
@@ -210,6 +223,11 @@ class UniswapPriceOracle {
     return keccak256(encoded);
   }
 
+  async isPoolInitialized(): Promise<boolean> {
+    const [sqrtPriceX96] = await this.stateView.read.getSlot0([this.poolId], undefined);
+    return sqrtPriceX96 !== 0n;
+  }
+
   /**
    * Gets the price as ETH per FeeAsset, scaled by 1e12.
    * This is the format expected by the rollup contract.