bitcore-node
Version:
A blockchain indexing node with extended capabilities using bitcore
77 lines • 2.63 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.BlockCypher = exports.BlockCypherClass = void 0;
const request_1 = __importDefault(require("request"));
const util_1 = __importDefault(require("util"));
const logger_1 = __importDefault(require("../../logger"));
class BlockCypherClass {
constructor() {
this.feeUrls = {
mainnet: 'https://api.blockcypher.com/v1/btc/main',
testnet3: 'https://api.blockcypher.com/v1/btc/test3'
};
this.cache = {
mainnet: {
timestamp: 0,
response: null
},
testnet3: {
timestamp: 0,
response: null
}
};
}
async getFee(network, nblocks) {
try {
network = network === 'regtest' ? 'testnet3' : network;
// blockcypher rate limits to 3 req/s or 100 req/hr, so cache for 1.5 minutes
if (this.cache[network] && this.cache[network].timestamp > Date.now() - 1000 * 90) {
return this._getFeeLevel(this.cache[network].response, nblocks);
}
const res = await util_1.default.promisify(request_1.default.get).call(request_1.default, {
uri: this.feeUrls[network],
json: true
});
if (res.statusCode !== 200) {
throw new Error(`Status code: ${res.statusCode}`);
}
const fee = res.body;
this.cache[network] = {
timestamp: Date.now(),
response: fee
};
return this._getFeeLevel(fee, nblocks);
}
catch (err) {
logger_1.default.warn('Error getting fee from blockcypher: %o', err.message || err);
throw err;
}
}
;
/**
* Return the appropriate fee level for nblocks per the ref.
* REF: https://www.blockcypher.com/dev/bitcoin/#blockchain
* @param response
* @param nblocks
* @returns
*/
_getFeeLevel(response, nblocks) {
if (nblocks <= 2) {
return response.high_fee_per_kb / 1000;
}
else if (nblocks <= 6) {
return response.medium_fee_per_kb / 1000;
}
else {
return response.low_fee_per_kb / 1000;
}
}
;
}
exports.BlockCypherClass = BlockCypherClass;
;
exports.BlockCypher = new BlockCypherClass();
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