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refactor(zero-cache): allow reusing
connection for syncer and mutator
The mutator/pusher will have its own websocket connection. Make the `Connection` class reusable by parameterizing it with a `messageHandler`
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146 changes: 146 additions & 0 deletions
146
packages/zero-cache/src/workers/syncer-ws-message-handler.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| import {trace} from '@opentelemetry/api'; | ||
| import {Lock} from '@rocicorp/lock'; | ||
| import type {Mutagen} from '../services/mutagen/mutagen.ts'; | ||
| import type { | ||
| SyncContext, | ||
| TokenData, | ||
| ViewSyncer, | ||
| } from '../services/view-syncer/view-syncer.ts'; | ||
| import type {HandlerResult, MessageHandler} from './connection.ts'; | ||
| import {version} from '../../../otel/src/version.ts'; | ||
| import * as ErrorKind from '../../../zero-protocol/src/error-kind-enum.ts'; | ||
| import type {Upstream} from '../../../zero-protocol/src/up.ts'; | ||
| import {startAsyncSpan, startSpan} from '../../../otel/src/span.ts'; | ||
| import {unreachable} from '../../../shared/src/asserts.ts'; | ||
| import type {LogContext} from '@rocicorp/logger'; | ||
| import type {JWTPayload} from 'jose'; | ||
| import type {ErrorBody} from '../../../zero-protocol/src/error.ts'; | ||
| import type {ConnectParams} from '../services/dispatcher/connect-params.ts'; | ||
|
|
||
| const tracer = trace.getTracer('syncer-ws-server', version); | ||
|
|
||
| export class SyncerWsMessageHandler implements MessageHandler { | ||
| readonly #viewSyncer: ViewSyncer; | ||
| readonly #mutagen: Mutagen; | ||
| readonly #mutationLock: Lock; | ||
| readonly #lc: LogContext; | ||
| readonly #authData: JWTPayload | undefined; | ||
| readonly #clientGroupID: string; | ||
| readonly #syncContext: SyncContext; | ||
|
|
||
| constructor( | ||
| lc: LogContext, | ||
| connectParams: ConnectParams, | ||
| tokenData: TokenData | undefined, | ||
| viewSyncer: ViewSyncer, | ||
| mutagen: Mutagen, | ||
| ) { | ||
| const { | ||
| clientGroupID, | ||
| clientID, | ||
| wsID, | ||
| baseCookie, | ||
| protocolVersion, | ||
| schemaVersion, | ||
| } = connectParams; | ||
| this.#viewSyncer = viewSyncer; | ||
| this.#mutagen = mutagen; | ||
| this.#mutationLock = new Lock(); | ||
| this.#lc = lc | ||
| .withContext('connection') | ||
| .withContext('clientID', clientID) | ||
| .withContext('clientGroupID', clientGroupID) | ||
| .withContext('wsID', wsID); | ||
| this.#authData = tokenData?.decoded; | ||
| this.#clientGroupID = clientGroupID; | ||
| this.#syncContext = { | ||
| clientID, | ||
| wsID, | ||
| baseCookie, | ||
| protocolVersion, | ||
| schemaVersion, | ||
| tokenData, | ||
| }; | ||
| } | ||
|
|
||
| async handleMessage(msg: Upstream): Promise<HandlerResult> { | ||
| const lc = this.#lc; | ||
| const msgType = msg[0]; | ||
| const viewSyncer = this.#viewSyncer; | ||
| switch (msgType) { | ||
| case 'ping': | ||
| lc.error?.('Pull is not supported by Zero'); | ||
| break; | ||
| case 'pull': | ||
| lc.error?.('Pull is not supported by Zero'); | ||
| break; | ||
| case 'push': { | ||
| return startAsyncSpan<HandlerResult>( | ||
| tracer, | ||
| 'connection.push', | ||
| async () => { | ||
| const {clientGroupID, mutations, schemaVersion} = msg[1]; | ||
| if (clientGroupID !== this.#clientGroupID) { | ||
| return { | ||
| type: 'fatal', | ||
| error: { | ||
| kind: ErrorKind.InvalidPush, | ||
| message: | ||
| `clientGroupID in mutation "${clientGroupID}" does not match ` + | ||
| `clientGroupID of connection "${this.#clientGroupID}`, | ||
| }, | ||
| } satisfies HandlerResult; | ||
| } | ||
| // Hold a connection-level lock while processing mutations so that: | ||
| // 1. Mutations are processed in the order in which they are received and | ||
| // 2. A single view syncer connection cannot hog multiple upstream connections. | ||
| const ret = await this.#mutationLock.withLock(async () => { | ||
| const errors: ErrorBody[] = []; | ||
| for (const mutation of mutations) { | ||
| const maybeError = await this.#mutagen.processMutation( | ||
| mutation, | ||
| this.#authData, | ||
| schemaVersion, | ||
| ); | ||
| if (maybeError !== undefined) { | ||
| errors.push({kind: maybeError[0], message: maybeError[1]}); | ||
| } | ||
| } | ||
| if (errors.length > 0) { | ||
| return {type: 'transient', errors} satisfies HandlerResult; | ||
| } | ||
| return {type: 'ok'} satisfies HandlerResult; | ||
| }); | ||
| return ret; | ||
| }, | ||
| ); | ||
| } | ||
| case 'changeDesiredQueries': | ||
| await startAsyncSpan(tracer, 'connection.changeDesiredQueries', () => | ||
| viewSyncer.changeDesiredQueries(this.#syncContext, msg), | ||
| ); | ||
| break; | ||
| case 'deleteClients': | ||
| await startAsyncSpan(tracer, 'connection.deleteClients', () => | ||
| viewSyncer.deleteClients(this.#syncContext, msg), | ||
| ); | ||
| break; | ||
| case 'initConnection': { | ||
| // TODO (mlaw): tell mutagens about the new token too | ||
| const stream = await startSpan( | ||
| tracer, | ||
| 'connection.initConnection', | ||
| () => viewSyncer.initConnection(this.#syncContext, msg), | ||
| ); | ||
| return { | ||
| type: 'stream', | ||
| stream, | ||
| }; | ||
| } | ||
| default: | ||
| unreachable(msgType); | ||
| } | ||
|
|
||
| return {type: 'ok'}; | ||
| } | ||
| } |
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