| 1 | // The RPC peer's host-to-core requests: cancellation by AbortSignal. |
| 2 | import { test } from 'node:test' |
| 3 | import assert from 'node:assert/strict' |
| 4 | import { ErrorCode } from '../dist/protocol.mjs' |
| 5 | import { RpcError, RpcPeer } from '../dist/rpc.mjs' |
| 6 | |
| 7 | function peer() { |
| 8 | const sent = [] |
| 9 | const rpc = new RpcPeer((message) => sent.push(message), 'plugin') |
| 10 | return { rpc, sent } |
| 11 | } |
| 12 | |
| 13 | test('an aborted request sends $/cancel for its id and rejects as cancelled at once', async () => { |
| 14 | const { rpc, sent } = peer() |
| 15 | const controller = new AbortController() |
| 16 | const request = rpc.request('registry/unregister', { owner: { plugin_id: 'p', generation: 1, owner_token: 't' }, handle: 1 }, controller.signal) |
| 17 | const id = sent[0].id |
| 18 | assert.equal(sent.length, 1) |
| 19 | controller.abort() |
| 20 | await assert.rejects(request, (error) => error instanceof RpcError && error.code === ErrorCode.Cancelled) |
| 21 | assert.deepEqual(sent[1], { jsonrpc: '2.0', method: '$/cancel', params: { id } }) |
| 22 | // The answer that arrives anyway is dropped: nothing waits for it and nothing throws. |
| 23 | rpc.handle({ jsonrpc: '2.0', id, result: {} }) |
| 24 | // A second abort is a no-op. |
| 25 | controller.abort() |
| 26 | assert.equal(sent.length, 2) |
| 27 | }) |
| 28 | |
| 29 | test('an already-aborted signal sends nothing, and an answered request is never cancelled afterwards', async () => { |
| 30 | const { rpc, sent } = peer() |
| 31 | const aborted = AbortSignal.abort() |
| 32 | await assert.rejects(rpc.request('registry/unregister', { owner: { plugin_id: 'p', generation: 1, owner_token: 't' }, handle: 1 }, aborted), (error) => error.code === ErrorCode.Cancelled) |
| 33 | assert.equal(sent.length, 0) |
| 34 | |
| 35 | const controller = new AbortController() |
| 36 | const request = rpc.request('registry/unregister', { owner: { plugin_id: 'p', generation: 1, owner_token: 't' }, handle: 2 }, controller.signal) |
| 37 | rpc.handle({ jsonrpc: '2.0', id: sent[0].id, result: {} }) |
| 38 | assert.deepEqual(await request, {}) |
| 39 | controller.abort() |
| 40 | assert.equal(sent.length, 1, 'no $/cancel for a request that was already answered') |
| 41 | }) |
| 42 |