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example(mithril-client-wasm): add a nodejs example
Co-authored-by: Damien Lachaume <[email protected]>
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‎mithril-client-wasm/node-test/.gitignore‎

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node_modules

‎mithril-client-wasm/node-test/index.js‎

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import { MithrilClient } from "@mithril-dev/mithril-client-wasm";
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let aggregator_endpoint = "https://aggregator.testing-sanchonet.api.mithril.network/aggregator";
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let genesis_verification_key =
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"5b3132372c37332c3132342c3136312c362c3133372c3133312c3231332c3230372c3131372c3139382c38352c3137362c3139392c3136322c3234312c36382c3132332c3131392c3134352c31332c3233322c3234332c34392c3232392c322c3234392c3230352c3230352c33392c3233352c34345d";
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let certificate_chain_validated_occurs = false;
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const broadcast_channel = new BroadcastChannel("mithril-client");
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broadcast_channel.onmessage = (e) => {
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let event = e.data;
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if (event.type === "CertificateChainValidationStarted") {
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console.log(
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`The certificate chain validation has started, event_id: ${event.payload.certificate_chain_validation_id}`
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);
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} else if (event.type === "CertificateValidated") {
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console.log(
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`A certificate has been validated, certificate_hash: ${event.payload.certificate_hash}, event_id: ${event.payload.certificate_chain_validation_id}`
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);
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} else if (event.type === "CertificateChainValidated") {
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certificate_chain_validated_occurs = true;
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console.log(
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`The certificate chain is valid, event_id: ${event.payload.certificate_chain_validation_id}`
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);
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} else {
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console.log(event);
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}
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};
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async function main() {
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async function waitUntilCertificateChainValidatedOccursOrTimeout() {
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for (let i = 0; i < 100 && !certificate_chain_validated_occurs; i++) {
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await new Promise((r) => setTimeout(r, 100));
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}
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certificate_chain_validated_occurs = false;
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}
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let client = new MithrilClient(aggregator_endpoint, genesis_verification_key, {
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// The following header is set as an example.
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// It's used to demonstrate how to add headers.
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http_headers: new Map([["Content-Type", "application/json"]]),
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// The following option activates the unstable features of the client.
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// Unstable features will trigger an error if this option is not set.
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unstable: true
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});
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console.log(1, "Getting stake distributions list...");
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let mithril_stake_distributions_list = await client.list_mithril_stake_distributions();
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console.log(
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"Result",
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"got " + mithril_stake_distributions_list.length + " stake distributions ✔️"
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);
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console.log("stake distributions:", mithril_stake_distributions_list);
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let last_mithril_stake_distribution = mithril_stake_distributions_list[0];
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console.log(
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2,
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"Getting last stake distribution with hash: " + last_mithril_stake_distribution.hash + "..."
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);
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let last_stake_distribution = await client.get_mithril_stake_distribution(
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last_mithril_stake_distribution.hash
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);
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console.log("Result", "got last stake distribution ✔️");
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console.log("last_stake_distribution:", {
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epoch: last_stake_distribution.epoch,
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signers: last_stake_distribution.signers.map((s) => `${s.party_id} - ${s.stake} lovelace`)
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});
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console.log(
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3,
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"Getting Mithril certificate from certificate hash: " +
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last_stake_distribution.certificate_hash +
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"..."
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);
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let certificate = await client.get_mithril_certificate(last_stake_distribution.certificate_hash);
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console.log("Result", "got Mithril certificate ✔️");
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console.log("certificate:", certificate.hash, "epoch:", certificate.epoch, "signed_entity:", certificate.signed_entity_type);
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console.log(4, "Verifying certificate chain...");
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let last_certificate_from_chain = await client.verify_certificate_chain(certificate.hash);
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await waitUntilCertificateChainValidatedOccursOrTimeout();
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console.log("Result", "certificate chain verified ✔️");
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console.log(
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"verify_certificate_chain OK, last_certificate_from_chain:",
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last_certificate_from_chain.hash
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);
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console.log(5, "Computing the Mithril stake distribution message...");
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let mithril_stake_distributions_message = await client.compute_mithril_stake_distribution_message(
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last_stake_distribution,
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last_certificate_from_chain
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);
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console.log("Result", "Mithril stake distribution message computed ✔️");
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console.log("mithril_stake_distributions_message:", mithril_stake_distributions_message);
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console.log(6, "Validating Mithril stake distribution message...");
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let valid_stake_distribution_message = await client.verify_message_match_certificate(
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mithril_stake_distributions_message,
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last_certificate_from_chain
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);
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console.log("Result", "Mithril stake distribution message validated ✔️");
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console.log("valid_stake_distribution_message:", valid_stake_distribution_message);
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console.log(7, "Getting transaction proof...");
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const proof = await client.get_cardano_transaction_proofs([
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"eac09f970f47ef3ab378db9232914e146773853397e79b904f1a45123a23c21f",
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"81fe7a5dab42867ef309b6d7210158bf99331884ac3c3b6c7188a8c9c18d5974",
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"320c13f4a3e51f6f4f66fcd9007e02bf658aa4ee9a88a509028d867d3b8a8e9a"
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]);
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console.log("Certificate hash of the returned proof", proof.certificate_hash);
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console.log(
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"Transactions hashes included in the proof:",
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proof.transactions_hashes
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);
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console.log(
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"Transactions hashes not included in the proof:",
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proof.non_certified_transactions
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);
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console.log(9, "Verifying certificate chain...");
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let proof_certificate = await client.verify_certificate_chain(proof.certificate_hash);
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await waitUntilCertificateChainValidatedOccursOrTimeout();
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console.log("Result", "certificate chain verified ✔️");
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console.log("verify_certificate_chain OK, last_certificate_from_chain:", proof_certificate?.hash);
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console.log(10, "Validating Cardano transaction proof message...");
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let protocol_message = await client.verify_cardano_transaction_proof_then_compute_message(
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proof,
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proof_certificate
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);
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console.log("Ensure that the proof is indeed signed in the associated certificate");
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if ((await client.verify_message_match_certificate(protocol_message, proof_certificate)) === true) {
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console.log("Result", "The proof is signed in the associated certificate ✔️");
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} else {
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console.log("Result", "Proof and certificate don't match ❌");
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}
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console.log("Transactions hashes certified", proof.transactions_hashes);
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console.log(
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"Transactions hashes not certified",
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proof.non_certified_transactions
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);
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process.exit(0);
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}
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await main();

‎mithril-client-wasm/node-test/package-lock.json‎

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‎mithril-client-wasm/node-test/package.json‎

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{
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"name": "node-test",
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"version": "0.3.0",
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"private": true,
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"type": "module",
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"scripts": {
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"start": "node index.js"
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},
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"dependencies": {
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"@mithril-dev/mithril-client-wasm": "file:../"
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}
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}

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