@atomiqlabs/chain-evm
Version:
EVM specific base implementation
73 lines (72 loc) • 2.34 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
exports.EVMBlocks = void 0;
const EVMModule_1 = require("../EVMModule");
class EVMBlocks extends EVMModule_1.EVMModule {
constructor() {
super(...arguments);
this.BLOCK_CACHE_TIME = 5 * 1000;
this.blockCache = {};
}
/**
* Initiates fetch of a given block & saves it to cache
*
* @private
* @param blockTag
*/
fetchAndSaveBlockTime(blockTag) {
const blockTagStr = blockTag.toString(10);
const blockPromise = this.provider.getBlock(blockTag, false);
const timestamp = Date.now();
this.blockCache[blockTagStr] = {
block: blockPromise,
timestamp
};
blockPromise.catch(() => {
if (this.blockCache[blockTagStr] != null && this.blockCache[blockTagStr].block === blockPromise)
delete this.blockCache[blockTagStr];
});
return {
block: blockPromise,
timestamp
};
}
cleanupBlocks() {
const currentTime = Date.now();
//Keys are in order that they were added, so we can stop at the first non-expired block
for (let key in this.blockCache) {
const block = this.blockCache[key];
if (currentTime - block.timestamp > this.BLOCK_CACHE_TIME) {
delete this.blockCache[key];
}
else {
break;
}
}
}
///////////////////
//// Blocks
/**
* Gets the block for a given blocktag, with caching
*
* @param blockTag
*/
getBlock(blockTag) {
this.cleanupBlocks();
let cachedBlockData = this.blockCache[blockTag.toString(10)];
if (cachedBlockData == null || Date.now() - cachedBlockData.timestamp > this.BLOCK_CACHE_TIME) {
cachedBlockData = this.fetchAndSaveBlockTime(blockTag);
}
return cachedBlockData.block;
}
/**
* Gets the block time for a given blocktag, with caching
*
* @param blockTag
*/
async getBlockTime(blockTag) {
const block = await this.getBlock(blockTag);
return block.timestamp;
}
}
exports.EVMBlocks = EVMBlocks;