@unruggable/gateways
Version:
Trustless Ethereum Multichain CCIP-Read Gateway
86 lines (85 loc) • 2.78 kB
JavaScript
export class AbstractRollup {
// allows configuration of commit and prover
// "expand LRU cache" => prover.proofLRU.maxCached = 1_000_000
// "disable fast lookups" => prover.fast = false
// "keep fast cache around longer" => prover.cache.cacheMs = Infinity
// "limit targets" => prover.maxUniqueTargets = 1
configure;
// block tag used for "latest" information
latestBlockTag = 'finalized';
// block interval for event scanning
getLogsStepSize = 10000;
provider1;
provider2;
constructor(providers) {
this.provider1 = providers.provider1;
this.provider2 = providers.provider2;
}
// default interface
get unfinalized() {
return false; // all rollups are finalized
}
async _fetchParentCommitIndex(commit) {
return commit.index - 1n; // immediate previous
}
async isCommitStillValid(_commit) {
return true; // always valid
}
// abstract wrappers
async fetchParentCommitIndex(commit) {
try {
if (!commit.index)
throw undefined;
const index = await this._fetchParentCommitIndex(commit);
if (index >= commit.index)
throw new Error(`${index} >= ${commit.index}`);
if (index < 0)
throw undefined;
return index;
}
catch (cause) {
throw new Error(`no parent commit: ${commit.index}`, { cause });
}
}
async fetchCommit(index) {
try {
const commit = await this._fetchCommit(index);
if (commit.index != index)
throw new Error(`${index} != ${commit.index}`);
this.configure?.(commit);
return commit;
}
catch (cause) {
throw new Error(`invalid commit: ${index}`, { cause });
}
}
// convenience
async fetchLatestCommit() {
return this.fetchCommit(await this.fetchLatestCommitIndex());
}
async fetchParentCommit(commit) {
return this.fetchCommit(await this.fetchParentCommitIndex(commit));
}
async fetchRecentCommits(count) {
if (count < 1)
return [];
let commit = await this.fetchLatestCommit();
const v = [commit];
while (v.length < count && commit.index > 0) {
commit = await this.fetchParentCommit(commit);
v.push(commit);
}
return v;
}
get defaultWindow() {
// was 1 day (86400)
// 20241116: changed 6 hours
return this.windowFromSec(6 * 3600);
}
}
export function supportsV1(rollup) {
return 'encodeWitnessV1' in rollup;
}
export function align(index, step) {
return step === 1 ? index : index - (index % BigInt(step));
}