chore: add script to check for blocks in chain logs

Co-authored-by: Dan Connolly <[email protected]>

contract/package.json

@@ -10,7 +10,7 @@
     "docker:bash": "docker compose exec agd bash",
     "docker:make": "docker compose exec agd make -C /workspace/contract",
     "make:help": "make list",
-    "start": "yarn docker:make clean start-contract",
+    "start": "./scripts/wait-for-chain.sh && yarn docker:make clean start-contract",
     "build": "agoric run scripts/build-contract-deployer.js",
     "test": "ava --verbose",
     "lint": "tsc && eslint '**/*.js'",

contract/scripts/wait-for-chain.sh

@@ -0,0 +1,33 @@
+#!/bin/bash
+
+# Function to check if we see a pattern of block commits
+check_block_pattern() {
+    local count=0
+    local required_patterns=3  # Number of block patterns we want to see
+
+    while IFS= read -r line; do
+        echo -n "."  # Show progress
+
+        if [[ $line =~ "block-manager: block "[0-9]+" commit" ]]; then
+            ((count++))
+            if [ $count -ge $required_patterns ]; then
+                echo
+                echo "$line"
+                return 0  # Success
+            fi
+        fi
+    done
+
+    return 1  # Pattern not found
+}
+
+echo "Waiting for blockchain to start..."
+yarn docker:logs | check_block_pattern
+
+if [ $? -eq 0 ]; then
+    echo "Blockchain is running and producing blocks..."
+    exit 0
+else
+    echo "Failed to detect blockchain activity\n Run yarn start:docker to start the blockchain first!"
+    exit 1
+fi