packages/client/lib/commands/XINFO_STREAM.ts
import { RedisCommandArgument, RedisCommandArguments } from '.';
import { StreamMessageReply, transformTuplesReply } from './generic-transformers';
export const FIRST_KEY_INDEX = 2;
export const IS_READ_ONLY = true;
export function transformArguments(key: RedisCommandArgument): RedisCommandArguments {
return ['XINFO', 'STREAM', key];
}
interface XInfoStreamReply {
length: number;
radixTreeKeys: number;
radixTreeNodes: number;
groups: number;
lastGeneratedId: RedisCommandArgument;
firstEntry: StreamMessageReply | null;
lastEntry: StreamMessageReply | null;
}
export function transformReply(rawReply: Array<any>): XInfoStreamReply {
const parsedReply: Partial<XInfoStreamReply> = {};
for (let i = 0; i < rawReply.length; i+= 2) {
switch (rawReply[i]) {
case 'length':
parsedReply.length = rawReply[i + 1];
break;
case 'radix-tree-keys':
parsedReply.radixTreeKeys = rawReply[i + 1];
break;
case 'radix-tree-nodes':
parsedReply.radixTreeNodes = rawReply[i + 1];
break;
case 'groups':
parsedReply.groups = rawReply[i + 1];
break;
case 'last-generated-id':
parsedReply.lastGeneratedId = rawReply[i + 1];
break;
case 'first-entry':
parsedReply.firstEntry = rawReply[i + 1] ? {
id: rawReply[i + 1][0],
message: transformTuplesReply(rawReply[i + 1][1])
} : null;
break;
case 'last-entry':
parsedReply.lastEntry = rawReply[i + 1] ? {
id: rawReply[i + 1][0],
message: transformTuplesReply(rawReply[i + 1][1])
} : null;
break;
}
}
return parsedReply as XInfoStreamReply;
}