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feat: add support for getFirstAvailableBlock method

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This commit is contained in:
Justin Starry
2020-05-23 17:33:04 +08:00
committed by Michael Vines
parent 1b8fe71230
commit 925c225885
4 changed files with 39 additions and 3 deletions
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21
web3.js/src/connection.js
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@ -417,9 +417,9 @@ const GetBlockTimeRpcResult = struct({
});
/**
* Expected JSON RPC response for the "minimumLedgerSlot" message
* Expected JSON RPC response for the "minimumLedgerSlot" and "getFirstAvailableBlock" messages
*/
const MinimumLedgerSlotRpcResult = struct({
const SlotRpcResult = struct({
jsonrpc: struct.literal('2.0'),
id: 'string',
error: 'any?',
@ -1081,7 +1081,7 @@ export class Connection {
*/
async getMinimumLedgerSlot(): Promise<number> {
const unsafeRes = await this._rpcRequest('minimumLedgerSlot', []);
const res = MinimumLedgerSlotRpcResult(unsafeRes);
const res = SlotRpcResult(unsafeRes);
if (res.error) {
throw new Error(
'failed to get minimum ledger slot: ' + res.error.message,
@ -1091,6 +1091,21 @@ export class Connection {
return res.result;
}
/**
* Fetch the slot of the lowest confirmed block that has not been purged from the ledger
*/
async getFirstAvailableBlock(): Promise<number> {
const unsafeRes = await this._rpcRequest('getFirstAvailableBlock', []);
const res = SlotRpcResult(unsafeRes);
if (res.error) {
throw new Error(
'failed to get first available block: ' + res.error.message,
);
}
assert(typeof res.result !== 'undefined');
return res.result;
}
/**
* Fetch information about the current supply
*/