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* feat: pubsub over gRPC Browsers can only have six concurrently open connections to a host name. Pubsub works over HTTP by holding a connection open per subscription, which means you can only subscribe six times before things start to hang. gRPC runs over websockets so doesn't have this limitation. This PR adds pubsub support to the gRPC server and `ipfs-client` module so you can subscribe to lots and lots of channels concurrently, working around the browser connection limitation. Refs: #3741
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58 changes: 58 additions & 0 deletions
58
packages/ipfs-grpc-client/src/core-api/pubsub/subscribe.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,58 @@ | ||
| 'use strict' | ||
|
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| const serverStreamToIterator = require('../../utils/server-stream-to-iterator') | ||
| const withTimeoutOption = require('ipfs-core-utils/src/with-timeout-option') | ||
| const subscriptions = require('./subscriptions') | ||
| const defer = require('p-defer') | ||
|
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| /** | ||
| * @param {import('@improbable-eng/grpc-web').grpc} grpc | ||
| * @param {*} service | ||
| * @param {import('../../types').Options} opts | ||
| */ | ||
| module.exports = function grpcPubsubSubscribe (grpc, service, opts) { | ||
| /** | ||
| * @type {import('ipfs-core-types/src/pubsub').API["subscribe"]} | ||
| */ | ||
| async function pubsubSubscribe (topic, handler, options = {}) { | ||
| const request = { | ||
| topic | ||
| } | ||
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| const deferred = defer() | ||
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| Promise.resolve().then(async () => { | ||
| try { | ||
| for await (const result of serverStreamToIterator(grpc, service, request, { | ||
| host: opts.url, | ||
| debug: Boolean(process.env.DEBUG), | ||
| metadata: options, | ||
| agent: opts.agent | ||
| })) { | ||
| if (result.handler) { | ||
| const subs = subscriptions.get(topic) || new Map() | ||
| subs.set(result.handler, handler) | ||
| subscriptions.set(topic, subs) | ||
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| deferred.resolve() | ||
| } else { | ||
| handler({ | ||
| from: result.from, | ||
| seqno: result.seqno, | ||
| data: result.data, | ||
| topicIDs: result.topicIDs | ||
| }) | ||
| } | ||
| } | ||
| } catch (err) { | ||
| if (options && options.onError) { | ||
| options.onError(err) | ||
| } | ||
| } | ||
| }) | ||
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| await deferred.promise | ||
| } | ||
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| return withTimeoutOption(pubsubSubscribe) | ||
| } |
10 changes: 10 additions & 0 deletions
10
packages/ipfs-grpc-client/src/core-api/pubsub/subscriptions.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,10 @@ | ||
| 'use strict' | ||
|
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| /** | ||
| * @typedef {import('ipfs-core-types/src/pubsub').MessageHandlerFn} Subscription | ||
| */ | ||
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| /** @type {Map<string, Map<string, Subscription>>} */ | ||
| const subs = new Map() | ||
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| module.exports = subs |
56 changes: 56 additions & 0 deletions
56
packages/ipfs-grpc-client/src/core-api/pubsub/unsubscribe.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| 'use strict' | ||
|
|
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| const withTimeoutOption = require('ipfs-core-utils/src/with-timeout-option') | ||
| const toHeaders = require('../../utils/to-headers') | ||
| const unaryToPromise = require('../../utils/unary-to-promise') | ||
| const subscriptions = require('./subscriptions') | ||
|
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| /** | ||
| * @param {import('@improbable-eng/grpc-web').grpc} grpc | ||
| * @param {*} service | ||
| * @param {import('../../types').Options} opts | ||
| */ | ||
| module.exports = function grpcPubsubUnsubscribe (grpc, service, opts) { | ||
| /** | ||
| * @type {import('ipfs-core-types/src/pubsub').API["unsubscribe"]} | ||
| */ | ||
| async function pubsubUnsubscribe (topic, handler, options = {}) { | ||
| const handlers = [] | ||
| const subs = subscriptions.get(topic) | ||
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| if (!subs) { | ||
| return | ||
| } | ||
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| if (handler) { | ||
| for (const [key, value] of subs.entries()) { | ||
| if (value === handler) { | ||
| handlers.push(key) | ||
| } | ||
| } | ||
| } else { | ||
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| } | ||
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| const request = { | ||
| topic, | ||
| handlers | ||
| } | ||
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| await unaryToPromise(grpc, service, request, { | ||
| host: opts.url, | ||
| metadata: toHeaders(options), | ||
| agent: opts.agent | ||
| }) | ||
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| for (const handlerId of handlers) { | ||
| subs.delete(handlerId) | ||
| } | ||
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| if (!subs.size) { | ||
| subscriptions.delete(topic) | ||
| } | ||
| } | ||
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| return withTimeoutOption(pubsubUnsubscribe) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,31 @@ | ||
| syntax = "proto3"; | ||
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| import "common.proto"; | ||
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| package ipfs; | ||
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| service PubSub { | ||
| rpc subscribe (SubscribeRequest) returns (stream SubscribeResponse) {} | ||
| rpc unsubscribe (UnSubscribeRequest) returns (UnSubscribeResponse) {} | ||
| } | ||
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| message SubscribeRequest { | ||
| string topic = 1; | ||
| } | ||
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| message SubscribeResponse { | ||
| string handler = 1; | ||
| string from = 2; | ||
| bytes seqno = 3; | ||
| bytes data = 4; | ||
| repeated string topicIDs = 5; | ||
| } | ||
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| message UnSubscribeRequest { | ||
| string topic = 1; | ||
| repeated string handlers = 2; | ||
| } | ||
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| message UnSubscribeResponse { | ||
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| } |
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