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add push message handler registration and make all pubsub use it. #2735

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add push message handler registration and make all pubsub use it. #2735

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9b1ac4c
add push message handler registration and make all pubsub use it.
sjpotter Apr 4, 2024
3340d49
enable push handler support to be tested / test it
sjpotter Apr 6, 2024
775e3a9
add test (/ fix code) to prevent overriding built in push handlers
sjpotter Apr 6, 2024
330e266
per github discussion, enable multiple handlers per push message type.
sjpotter Apr 9, 2024
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83 changes: 63 additions & 20 deletions packages/client/lib/client/commands-queue.ts
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Original file line number Diff line number Diff line change
@@ -1,8 +1,8 @@
import { SinglyLinkedList, DoublyLinkedNode, DoublyLinkedList } from './linked-list';
import encodeCommand from '../RESP/encoder';
import { Decoder, PUSH_TYPE_MAPPING, RESP_TYPES } from '../RESP/decoder';
import { CommandArguments, TypeMapping, ReplyUnion, RespVersions } from '../RESP/types';
import { ChannelListeners, PubSub, PubSubCommand, PubSubListener, PubSubType, PubSubTypeListeners } from './pub-sub';
import { TypeMapping, ReplyUnion, RespVersions, CommandArguments } from '../RESP/types';
import { COMMANDS, ChannelListeners, PUBSUB_TYPE, PubSub, PubSubCommand, PubSubListener, PubSubType, PubSubTypeListeners } from './pub-sub';
import { AbortError, ErrorReply } from '../errors';
import { MonitorCallback } from '.';

Expand Down Expand Up @@ -42,6 +42,8 @@ const RESP2_PUSH_TYPE_MAPPING = {
[RESP_TYPES.SIMPLE_STRING]: Buffer
};

export const pushHandlerError = 'Cannot override built in push message handler';

export default class RedisCommandsQueue {
readonly #respVersion;
readonly #maxLength;
Expand All @@ -51,6 +53,8 @@ export default class RedisCommandsQueue {
#chainInExecution: symbol | undefined;
readonly decoder;
readonly #pubSub = new PubSub();
readonly #pushHandlers: Map<string, (pushMsg: Array<any>) => unknown> = new Map();
readonly #builtInSet: ReadonlySet<string>;
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I'm wondering if we want to have builtInSet or just "hard-code" it instead?

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i think the set object would remain, much quicker to lookup in a set than multiple if conditions. not that this is very commonly used code path (i.e. just at registration/unregistration time)


get isPubSubActive() {
return this.#pubSub.isActive;
Expand All @@ -64,6 +68,23 @@ export default class RedisCommandsQueue {
this.#respVersion = respVersion;
this.#maxLength = maxLength;
this.#onShardedChannelMoved = onShardedChannelMoved;

this.#pushHandlers.set(COMMANDS[PUBSUB_TYPE.CHANNELS].message.toString(), this.#pubSub.handleMessageReplyChannel.bind(this.#pubSub));
this.#pushHandlers.set(COMMANDS[PUBSUB_TYPE.CHANNELS].subscribe.toString(), this.#handleStatusReply.bind(this));
this.#pushHandlers.set(COMMANDS[PUBSUB_TYPE.CHANNELS].unsubscribe.toString(), this.#handleStatusReply.bind(this));
this.#pushHandlers.set(COMMANDS[PUBSUB_TYPE.PATTERNS].message.toString(), this.#pubSub.handleMessageReplyPattern.bind(this.#pubSub));
this.#pushHandlers.set(COMMANDS[PUBSUB_TYPE.PATTERNS].subscribe.toString(), this.#handleStatusReply.bind(this));
this.#pushHandlers.set(COMMANDS[PUBSUB_TYPE.PATTERNS].unsubscribe.toString(), this.#handleStatusReply.bind(this));
this.#pushHandlers.set(COMMANDS[PUBSUB_TYPE.SHARDED].message.toString(), this.#pubSub.handleMessageReplySharded.bind(this.#pubSub));
this.#pushHandlers.set(COMMANDS[PUBSUB_TYPE.SHARDED].subscribe.toString(), this.#handleStatusReply.bind(this));
this.#pushHandlers.set(COMMANDS[PUBSUB_TYPE.SHARDED].unsubscribe.toString(), this.#handleShardedUnsubscribe.bind(this));

const s = new Set<string>();
this.#builtInSet = s;
for (const str of this.#pushHandlers.keys()) {
s.add(str);
}

this.decoder = this.#initiateDecoder();
}

Expand All @@ -75,28 +96,52 @@ export default class RedisCommandsQueue {
this.#waitingForReply.shift()!.reject(err);
}

#onPush(push: Array<any>) {
// TODO: type
if (this.#pubSub.handleMessageReply(push)) return true;

const isShardedUnsubscribe = PubSub.isShardedUnsubscribe(push);
if (isShardedUnsubscribe && !this.#waitingForReply.length) {
#handleStatusReply(push: Array<any>) {
const head = this.#waitingForReply.head!.value;
if (
(Number.isNaN(head.channelsCounter!) && push[2] === 0) ||
--head.channelsCounter! === 0
) {
this.#waitingForReply.shift()!.resolve();
}
}

#handleShardedUnsubscribe(push: Array<any>) {
if (!this.#waitingForReply.length) {
const channel = push[1].toString();
this.#onShardedChannelMoved(
channel,
this.#pubSub.removeShardedListeners(channel)
);
return true;
} else if (isShardedUnsubscribe || PubSub.isStatusReply(push)) {
const head = this.#waitingForReply.head!.value;
if (
(Number.isNaN(head.channelsCounter!) && push[2] === 0) ||
--head.channelsCounter! === 0
) {
this.#waitingForReply.shift()!.resolve();
}
} else {
this.#handleStatusReply(push);
}
}

addPushHandler(messageType: string, handler: (pushMsg: Array<any>) => unknown) {
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Either rename to setPushHandler or have support for multiple listeners, I'm not soo sure which one we wanna go for

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hmm. It's an interesting Q (and then how would remove work?) (and would fit with allowing it to exist with current handlers). Let me think.

if (this.#builtInSet.has(messageType)) {
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Is there a reason to block it? if the user wants a "global" listener - why not?

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this is javascript, dont want to let people hang themselves.

throw new Error(pushHandlerError);
}

this.#pushHandlers.set(messageType, handler);
}

removePushHandler(messageType: string) {
if (this.#builtInSet.has(messageType)) {
throw new Error(pushHandlerError);
}

this.#pushHandlers.delete(messageType);
}

#onPush(push: Array<any>) {
const handler = this.#pushHandlers.get(push[0].toString());
if (handler) {
handler(push);
return true;
}

return false;
}

#getTypeMapping() {
Expand All @@ -108,9 +153,7 @@ export default class RedisCommandsQueue {
onReply: reply => this.#onReply(reply),
onErrorReply: err => this.#onErrorReply(err),
onPush: push => {
if (!this.#onPush(push)) {

}
return this.#onPush(push);
},
getTypeMapping: () => this.#getTypeMapping()
});
Expand Down
84 changes: 84 additions & 0 deletions packages/client/lib/client/index.spec.ts
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Expand Up @@ -9,6 +9,8 @@ import { MATH_FUNCTION, loadMathFunction } from '../commands/FUNCTION_LOAD.spec'
import { RESP_TYPES } from '../RESP/decoder';
import { BlobStringReply, NumberReply } from '../RESP/types';
import { SortedSetMember } from '../commands/generic-transformers';
import { COMMANDS, PUBSUB_TYPE } from './pub-sub';
import { pushHandlerError } from './commands-queue';

export const SQUARE_SCRIPT = defineScript({
SCRIPT:
Expand Down Expand Up @@ -769,4 +771,86 @@ describe('Client', () => {
}
}, GLOBAL.SERVERS.OPEN);
});

describe.only('Push Handlers', () => {
testUtils.testWithClient('prevent overriding a built in handler', async client => {
assert.throws(() => {client.addPushHandler(COMMANDS[PUBSUB_TYPE.CHANNELS].message.toString(), (push: Array<any>) => {})}, new Error(pushHandlerError));
assert.throws(() => {client.removePushHandler(COMMANDS[PUBSUB_TYPE.CHANNELS].message.toString())}, new Error(pushHandlerError));
}, {
...GLOBAL.SERVERS.OPEN
});

testUtils.testWithClient('RESP2: add/remove invalidate handler, and validate its called', async client => {
const key = 'x'

const duplicate = await client.duplicate().connect();
try {
const id = await duplicate.clientId();

let nodeResolve;

const promise = new Promise((res) => {
nodeResolve = res;
});

duplicate.addPushHandler("invalidate", (push: Array<any>) => {
assert.equal(push[0].toString(), "invalidate");
assert.notEqual(push[1], null);
assert.equal(push[1].length, 1);
assert.equal(push[1][0].toString(), key);
// this test removing the handler,
// as flushAll in cleanup of test will issue a full invalidate,
// which would fail if this handler is called on it
duplicate.removePushHandler("invalidate");
nodeResolve();
})

await client.sendCommand(['CLIENT', 'TRACKING', 'ON', 'REDIRECT', id.toString()]);
await client.get(key);
await client.set(key, '1');

// force an invalidate all
await client.flushAll();

await nodeResolve;
} finally {
duplicate.destroy();
}
}, {
...GLOBAL.SERVERS.OPEN
});

testUtils.testWithClient('RESP3: add/remove invalidate handler, and validate its called', async client => {
const key = 'x'

let nodeResolve;

const promise = new Promise((res) => {
nodeResolve = res;
});

client.addPushHandler("invalidate", (push: Array<any>) => {
assert.equal(push[0].toString(), "invalidate");
assert.equal(push[1].length, 1);
assert.equal(push[1].length, 1);
assert.equal(push[1][0].toString(), key);
// this test removing the handler,
// as flushAll in cleanup of test will issue a full invalidate,
// which would fail if this handler is called on it
client.removePushHandler("invalidate");
nodeResolve();
})

await client.sendCommand(['CLIENT', 'TRACKING', 'ON']);
await client.get(key);
await client.set(key, '1');

await nodeResolve;
}, {
...GLOBAL.SERVERS.OPEN,
clientOptions: {
RESP: 3
}
});
});
});
8 changes: 8 additions & 0 deletions packages/client/lib/client/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -573,6 +573,14 @@ export default class RedisClient<
return this as unknown as RedisClientType<M, F, S, RESP, TYPE_MAPPING>;
}

addPushHandler(messageType: string, handler: (pushMsg: Array<any>) => unknown) {
this._self.#queue.addPushHandler(messageType, handler);
}

removePushHandler(messageType: string) {
this._self.#queue.removePushHandler(messageType);
}

sendCommand<T = ReplyUnion>(
args: Array<RedisArgument>,
options?: CommandOptions
Expand Down
49 changes: 23 additions & 26 deletions packages/client/lib/client/pub-sub.ts
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Expand Up @@ -11,7 +11,7 @@ export type PUBSUB_TYPE = typeof PUBSUB_TYPE;

export type PubSubType = PUBSUB_TYPE[keyof PUBSUB_TYPE];

const COMMANDS = {
export const COMMANDS = {
[PUBSUB_TYPE.CHANNELS]: {
subscribe: Buffer.from('subscribe'),
unsubscribe: Buffer.from('unsubscribe'),
Expand Down Expand Up @@ -344,32 +344,29 @@ export class PubSub {
return commands;
}

handleMessageReply(reply: Array<Buffer>): boolean {
if (COMMANDS[PUBSUB_TYPE.CHANNELS].message.equals(reply[0])) {
this.#emitPubSubMessage(
PUBSUB_TYPE.CHANNELS,
reply[2],
reply[1]
);
return true;
} else if (COMMANDS[PUBSUB_TYPE.PATTERNS].message.equals(reply[0])) {
this.#emitPubSubMessage(
PUBSUB_TYPE.PATTERNS,
reply[3],
reply[2],
reply[1]
);
return true;
} else if (COMMANDS[PUBSUB_TYPE.SHARDED].message.equals(reply[0])) {
this.#emitPubSubMessage(
PUBSUB_TYPE.SHARDED,
reply[2],
reply[1]
);
return true;
}
handleMessageReplyChannel(push: Array<Buffer>) {
this.#emitPubSubMessage(
PUBSUB_TYPE.CHANNELS,
push[2],
push[1]
);
}

return false;
handleMessageReplyPattern(push: Array<Buffer>) {
this.#emitPubSubMessage(
PUBSUB_TYPE.PATTERNS,
push[3],
push[2],
push[1]
);
}

handleMessageReplySharded(push: Array<Buffer>) {
this.#emitPubSubMessage(
PUBSUB_TYPE.SHARDED,
push[2],
push[1]
);
}

removeShardedListeners(channel: string): ChannelListeners {
Expand Down