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fix(blockchain-explorer): fix template formatting and enhance health check endpoint

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- Fix CSS animation syntax in HTML template by escaping curly braces for proper f-string formatting
- Replace .format() with .replace() for node_url substitution to avoid KeyError with unescaped braces
- Add blockchain node connectivity test to health check with 5s timeout
- Return degraded status when node is unreachable instead of error
- Add node_status field and API endpoints documentation to health response
This commit is contained in:
oib
2026-02-28 21:58:53 +01:00
parent 2d97783fb1
commit 12df88d196
4 changed files with 397 additions and 6 deletions
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24
apps/blockchain-explorer/main.py
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@@ -31,8 +31,8 @@ HTML_TEMPLATE = r"""
<script src="https://cdn.tailwindcss.com"></script>
<script src="https://unpkg.com/lucide@latest"></script>
<style>
.fade-in { animation: fadeIn 0.3s ease-in; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.fade-in {{ animation: fadeIn 0.3s ease-in; }}
@keyframes fadeIn {{ from {{ opacity: 0; }} to {{ opacity: 1; }} }}
</style>
</head>
<body class="bg-gray-50">
@@ -422,7 +422,7 @@ async def get_block(height: int) -> Dict[str, Any]:
@app.get("/", response_class=HTMLResponse)
async def root():
"""Serve the explorer UI"""
return HTML_TEMPLATE.format(node_url=BLOCKCHAIN_RPC_URL)
return HTML_TEMPLATE.replace("{node_url}", BLOCKCHAIN_RPC_URL)
@app.get("/api/chain/head")
@@ -468,11 +468,23 @@ async def api_transaction(tx_hash: str):
@app.get("/health")
async def health():
"""Health check endpoint"""
head = await get_chain_head()
try:
# Test blockchain node connectivity
async with httpx.AsyncClient() as client:
response = await client.get(f"{BLOCKCHAIN_RPC_URL}/rpc/head", timeout=5.0)
node_status = "ok" if response.status_code == 200 else "error"
except Exception:
node_status = "error"
return {
"status": "ok" if head else "error",
"status": "ok" if node_status == "ok" else "degraded",
"node_status": node_status,
"node_url": BLOCKCHAIN_RPC_URL,
"chain_height": head.get("height", 0),
"endpoints": {
"transactions": "/api/transactions/{tx_hash}",
"chain_head": "/api/chain/head",
"blocks": "/api/blocks/{height}"
}
}