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Adjust Maestro::getUnspentOutputByNFT flow to prevent race condition. #178

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merged 1 commit into from
Sep 26, 2024
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Adjust Maestro::getUnspentOutputByNFT flow to prevent race condition. #178

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5 changes: 5 additions & 0 deletions .changeset/gentle-tools-own.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1,5 @@
---
"@blaze-cardano/query": patch
---

Adjust Maestro::getUnspentOutputByNFT flow to prevent race condition.
81 changes: 39 additions & 42 deletions packages/blaze-query/src/maestro.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -206,10 +206,7 @@ export class Maestro implements Provider {
}

getUnspentOutputByNFT(unit: AssetId): Promise<TransactionUnspentOutput> {
const asset = unit;
const query = `/assets/${asset}/`;

return fetch(`${this.url}${query}utxos?count=100`, {
return fetch(`${this.url}/assets/${unit}/utxos?count=2`, {
headers: this.headers(),
})
.then((resp) => resp.json())
Expand All @@ -221,50 +218,50 @@ export class Maestro implements Provider {
`getUnspentOutputs: Maestro threw "${response.message}"`,
);
}
const utxos: TransactionUnspentOutput[] = [];
for (const maestroUTxO of response.data) {
const txIn = new TransactionInput(
TransactionId(maestroUTxO.tx_hash),
BigInt(maestroUTxO.index),
);

const query2 = `/transactions/${maestroUTxO.tx_hash}/outputs/${maestroUTxO.index}/txo`;

fetch(`${this.url}${query2}?with_cbor=true`, {
headers: this.headers(),
})
.then((resp) => resp.json())
.then((json) => {
if (json) {
const response =
json as MaestroResponse<MaestroOneUTxOResponse>;
if ("message" in response) {
throw new Error(
`getUnspentOutputs: Maestro threw "${response.message}"`,
);
}

const txOut = TransactionOutput.fromCbor(
HexBlob(response.data.txout_cbor),
);
utxos.push(new TransactionUnspentOutput(txIn, txOut));
} else {
throw new Error(
"getUnspentOutputByNFT: Could not parse response json",
);
}
});
}

if (utxos.length !== 1) {
const utxo = response.data[0];
if (response.data.length !== 1 || !utxo) {
throw new Error(
"getUnspentOutputByNFT: Expected 1 UTxO, got " + utxos.length,
"getUnspentOutputByNFT: Expected 1 UTxO, got " +
response.data.length,
);
}

return utxos[0];
return utxo;
} else {
throw new Error("getUnspentOutputs: Could not parse response json");
}
throw new Error("getUnspentOutputs: Could not parse response json");
})
.then((utxo) => {
const txIn = new TransactionInput(
TransactionId(utxo.tx_hash),
BigInt(utxo.index),
);
const query = `/transactions/${utxo.tx_hash}/outputs/${utxo.index}/txo`;

return fetch(`${this.url}${query}?with_cbor=true`, {
headers: this.headers(),
})
.then((resp) => resp.json())
.then((json) => {
if (json) {
const response = json as MaestroResponse<MaestroOneUTxOResponse>;
if ("message" in response) {
throw new Error(
`getUnspentOutputs: Maestro threw "${response.message}"`,
);
}

const txOut = TransactionOutput.fromCbor(
HexBlob(response.data.txout_cbor),
);
return new TransactionUnspentOutput(txIn, txOut);
} else {
throw new Error(
"getUnspentOutputByNFT: Could not parse response json",
);
}
});
})
.then((x) => x!);
}
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