diff --git a/_examples/compression_playground/readme.md b/_examples/compression_playground/readme.md index 373e8d90..c3d46e30 100644 --- a/_examples/compression_playground/readme.md +++ b/_examples/compression_playground/readme.md @@ -1,7 +1,9 @@ This is a sample simulation of football match where the entire state is sent into WebSocket connection upon every -match event. +match event. The example is not very idiomatic because we try to simulate various modes thus several different +files were required. In practice, you will have JSON or Protobuf case only, and there is no need to tweak behaviour +over URL params like we do here. -The goal is to compare different compression strategies for WebSocket data transfer. Please note, that results +The goal was to compare different compression strategies for WebSocket data transfer. Please note, that results depend a lot on the data you send. You may get absolutely different results for your data. Still we hope this example gives some insights on how to choose the best compression strategy and what to expect from Centrifuge. diff --git a/_examples/compression_playground/templates/json.html b/_examples/compression_playground/templates/json.html index 3cfd2899..68e72c3b 100644 --- a/_examples/compression_playground/templates/json.html +++ b/_examples/compression_playground/templates/json.html @@ -58,6 +58,9 @@ debug: true, }); + // We are using cache recovery feature in the example, passing since: {} allows to trigger recovery + // on initial subscribe. For cache recovery the previous stream position does not matter - server + // just tries to extract latest publication from channel history and send it to client. let subOptions = { since: {}, } diff --git a/_examples/recovery_mode_cache/centrifuge.js b/_examples/recovery_mode_cache/centrifuge.js new file mode 100644 index 00000000..ab550cbe --- /dev/null +++ b/_examples/recovery_mode_cache/centrifuge.js @@ -0,0 +1,7 @@ +"use strict";(()=>{var ne=Object.create;var N=Object.defineProperty;var ie=Object.getOwnPropertyDescriptor;var se=Object.getOwnPropertyNames;var re=Object.getPrototypeOf,oe=Object.prototype.hasOwnProperty;var ae=(o,s)=>()=>(s||o((s={exports:{}}).exports,s),s.exports);var ce=(o,s,e,t)=>{if(s&&typeof s=="object"||typeof s=="function")for(let n of se(s))!oe.call(o,n)&&n!==e&&N(o,n,{get:()=>s[n],enumerable:!(t=ie(s,n))||t.enumerable});return o};var W=(o,s,e)=>(e=o!=null?ne(re(o)):{},ce(s||!o||!o.__esModule?N(e,"default",{value:o,enumerable:!0}):e,o));var M=ae((Se,A)=>{"use strict";var y=typeof Reflect=="object"?Reflect:null,q=y&&typeof y.apply=="function"?y.apply:function(s,e,t){return Function.prototype.apply.call(s,e,t)},P;y&&typeof y.ownKeys=="function"?P=y.ownKeys:Object.getOwnPropertySymbols?P=function(s){return Object.getOwnPropertyNames(s).concat(Object.getOwnPropertySymbols(s))}:P=function(s){return Object.getOwnPropertyNames(s)};function ue(o){console&&console.warn&&console.warn(o)}var H=Number.isNaN||function(s){return s!==s};function u(){u.init.call(this)}A.exports=u;A.exports.once=pe;u.EventEmitter=u;u.prototype._events=void 0;u.prototype._eventsCount=0;u.prototype._maxListeners=void 0;var J=10;function C(o){if(typeof o!="function")throw new TypeError('The "listener" argument must be of type Function. 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te=W(M()),ve={token:"",getToken:null,data:null,getData:null,debug:!1,name:"js",version:"",fetch:null,readableStream:null,websocket:null,eventsource:null,sockjs:null,sockjsOptions:{},emulationEndpoint:"/emulation",minReconnectDelay:500,maxReconnectDelay:2e4,timeout:5e3,maxServerPingDelay:1e4,networkEventTarget:null},b=class extends Error{constructor(s){super(s),this.name=this.constructor.name}},g=class extends te.default{constructor(e,t){super();this._reconnectTimeout=null;this._refreshTimeout=null;this._serverPingTimeout=null;this.state="disconnected",this._transportIsOpen=!1,this._endpoint=e,this._emulation=!1,this._transports=[],this._currentTransportIndex=0,this._triedAllTransports=!1,this._transportWasOpen=!1,this._transport=null,this._transportId=0,this._deviceWentOffline=!1,this._transportClosed=!0,this._codec=new E,this._reconnecting=!1,this._reconnectTimeout=null,this._reconnectAttempts=0,this._client=null,this._session="",this._node="",this._subs={},this._serverSubs={},this._commandId=0,this._commands=[],this._batching=!1,this._refreshRequired=!1,this._refreshTimeout=null,this._callbacks={},this._token="",this._data=null,this._dispatchPromise=Promise.resolve(),this._serverPing=0,this._serverPingTimeout=null,this._sendPong=!1,this._promises={},this._promiseId=0,this._debugEnabled=!1,this._networkEventsSet=!1,this._config={...ve,...t},this._configure(),this._debugEnabled?(this.on("state",n=>{this._debug("client state",n.oldState,"->",n.newState)}),this.on("error",n=>{this._debug("client error",n)})):this.on("error",function(){Function.prototype()})}newSubscription(e,t){if(this.getSubscription(e)!==null)throw new Error("Subscription to the channel "+e+" already exists");let n=new O(this,e,t);return this._subs[e]=n,n}getSubscription(e){return this._getSub(e)}removeSubscription(e){e&&(e.state!=="unsubscribed"&&e.unsubscribe(),this._removeSubscription(e))}subscriptions(){return this._subs}ready(e){return this.state==="disconnected"?Promise.reject({code:3,message:"client disconnected"}):this.state==="connected"?Promise.resolve():new Promise((t,n)=>{let i={resolve:t,reject:n};e&&(i.timeout=setTimeout(function(){n({code:1,message:"timeout"})},e)),this._promises[this._nextPromiseId()]=i})}connect(){if(this._isConnected()){this._debug("connect called when already connected");return}if(this._isConnecting()){this._debug("connect called when already connecting");return}this._debug("connect called"),this._reconnectAttempts=0,this._startConnecting()}disconnect(){this._disconnect(0,"disconnect called",!1)}setToken(e){this._token=e}send(e){let t={send:{data:e}},n=this;return this._methodCall().then(function(){return n._transportSendCommands([t])?Promise.resolve():Promise.reject(n._createErrorObject(10,"transport write error"))})}rpc(e,t){let n={rpc:{method:e,data:t}},i=this;return this._methodCall().then(function(){return i._callPromise(n,function(r){return{data:r.rpc.data}})})}publish(e,t){let n={publish:{channel:e,data:t}},i=this;return this._methodCall().then(function(){return i._callPromise(n,function(){return{}})})}history(e,t){let n={history:this._getHistoryRequest(e,t)},i=this;return this._methodCall().then(function(){return i._callPromise(n,function(r){let a=r.history,c=[];if(a.publications)for(let h=0;h{this._debug("offline event triggered"),(this.state==="connected"||this.state==="connecting")&&(this._disconnect(1,"transport closed",!0),this._deviceWentOffline=!0)}),e.addEventListener("online",()=>{this._debug("online event triggered"),this.state==="connecting"&&(this._deviceWentOffline&&!this._transportClosed&&(this._deviceWentOffline=!1,this._transportClosed=!0),this._clearReconnectTimeout(),this._startReconnecting())}),this._networkEventsSet=!0)}_getReconnectDelay(){let e=S(this._reconnectAttempts,this._config.minReconnectDelay,this._config.maxReconnectDelay);return this._reconnectAttempts+=1,e}_clearOutgoingRequests(){for(let e in this._callbacks)if(this._callbacks.hasOwnProperty(e)){let t=this._callbacks[e];clearTimeout(t.timeout);let n=t.errback;if(!n)continue;n({error:this._createErrorObject(11,"connection closed")})}this._callbacks={}}_clearConnectedState(){this._client=null,this._clearServerPingTimeout(),this._clearRefreshTimeout();for(let e in this._subs){if(!this._subs.hasOwnProperty(e))continue;let t=this._subs[e];t.state==="subscribed"&&t._setSubscribing(1,"transport closed")}for(let e in this._serverSubs)this._serverSubs.hasOwnProperty(e)&&this.emit("subscribing",{channel:e})}_handleWriteError(e){for(let t of e){let n=t.id;if(!(n in this._callbacks))continue;let i=this._callbacks[n];clearTimeout(this._callbacks[n].timeout),delete this._callbacks[n];let r=i.errback;r({error:this._createErrorObject(10,"transport write error")})}}_transportSendCommands(e){if(!e.length)return!0;if(!this._transport)return!1;try{this._transport.send(this._codec.encodeCommands(e),this._session,this._node)}catch(t){return this._debug("error writing commands",t),this._handleWriteError(e),!1}return!0}_initializeTransport(){let e;this._config.websocket!==null?e=this._config.websocket:typeof globalThis.WebSocket!="function"&&typeof globalThis.WebSocket!="object"||(e=globalThis.WebSocket);let t=null;this._config.sockjs!==null?t=this._config.sockjs:typeof globalThis.SockJS<"u"&&(t=globalThis.SockJS);let n=null;this._config.eventsource!==null?n=this._config.eventsource:typeof globalThis.EventSource<"u"&&(n=globalThis.EventSource);let i=null;this._config.fetch!==null?i=this._config.fetch:typeof globalThis.fetch<"u"&&(i=globalThis.fetch);let r=null;if(this._config.readableStream!==null?r=this._config.readableStream:typeof globalThis.ReadableStream<"u"&&(r=globalThis.ReadableStream),this._emulation){this._currentTransportIndex>=this._transports.length&&(this._triedAllTransports=!0,this._currentTransportIndex=0);let l=0;for(;;){if(l>=this._transports.length)throw new Error("no supported transport found");let p=this._transports[this._currentTransportIndex],d=p.transport,f=p.endpoint;if(d==="websocket"){if(this._debug("trying websocket transport"),this._transport=new T(f,{websocket:e}),!this._transport.supported()){this._debug("websocket transport not available"),this._currentTransportIndex++,l++;continue}}else if(d==="webtransport"){if(this._debug("trying webtransport transport"),this._transport=new I(f,{webtransport:globalThis.WebTransport,decoder:this._codec,encoder:this._codec}),!this._transport.supported()){this._debug("webtransport transport not available"),this._currentTransportIndex++,l++;continue}}else if(d==="http_stream"){if(this._debug("trying http_stream transport"),this._transport=new j(f,{fetch:i,readableStream:r,emulationEndpoint:this._config.emulationEndpoint,decoder:this._codec,encoder:this._codec}),!this._transport.supported()){this._debug("http_stream transport not available"),this._currentTransportIndex++,l++;continue}}else if(d==="sse"){if(this._debug("trying sse transport"),this._transport=new D(f,{eventsource:n,fetch:i,emulationEndpoint:this._config.emulationEndpoint}),!this._transport.supported()){this._debug("sse transport not available"),this._currentTransportIndex++,l++;continue}}else if(d==="sockjs"){if(this._debug("trying sockjs"),this._transport=new L(f,{sockjs:t,sockjsOptions:this._config.sockjsOptions}),!this._transport.supported()){this._debug("sockjs transport not available"),this._currentTransportIndex++,l++;continue}}else throw new Error("unknown transport "+d);break}}else{if(Y(this._endpoint,"http"))throw new Error("Provide explicit transport endpoints configuration in case of using HTTP (i.e. using array of TransportEndpoint instead of a single string), or use ws(s):// scheme in an endpoint if you aimed using WebSocket transport");if(this._debug("client will use websocket"),this._transport=new T(this._endpoint,{websocket:e}),!this._transport.supported())throw new Error("WebSocket not available")}let a=this,c=this._transport,h=this._nextTransportId();a._debug("id of transport",h);let m=!1,v=[];if(this._transport.emulation()){let l=a._sendConnect(!0);v.push(l)}this._setNetworkEvents();let w=this._codec.encodeCommands(v);this._transportClosed=!1;let _;_=setTimeout(function(){c.close()},this._config.timeout),this._transport.initialize(this._codec.name(),{onOpen:function(){if(_&&(clearTimeout(_),_=null),a._transportId!=h){a._debug("open callback from non-actual transport"),c.close();return}m=!0,a._debug(c.subName(),"transport open"),!c.emulation()&&(a._transportIsOpen=!0,a._transportWasOpen=!0,a.startBatching(),a._sendConnect(!1),a._sendSubscribeCommands(),a.stopBatching(),a.emit("__centrifuge_debug:connect_frame_sent",{}))},onError:function(l){if(a._transportId!=h){a._debug("error callback from non-actual transport");return}a._debug("transport level error",l)},onClose:function(l){if(_&&(clearTimeout(_),_=null),a._transportId!=h){a._debug("close callback from non-actual transport");return}a._debug(c.subName(),"transport closed"),a._transportClosed=!0,a._transportIsOpen=!1;let p="connection closed",d=!0,f=0;if(l&&"code"in l&&l.code&&(f=l.code),l&&l.reason)try{let U=JSON.parse(l.reason);p=U.reason,d=U.reconnect}catch{p=l.reason,(f>=3500&&f<4e3||f>=4500&&f<5e3)&&(d=!1)}f<3e3?(f===1009?(f=3,p="message size limit exceeded",d=!1):(f=1,p="transport closed"),a._emulation&&!a._transportWasOpen&&(a._currentTransportIndex++,a._currentTransportIndex>=a._transports.length&&(a._triedAllTransports=!0,a._currentTransportIndex=0))):a._transportWasOpen=!0,a._isConnecting()&&!m&&a.emit("error",{type:"transport",error:{code:2,message:"transport closed"},transport:c.name()}),a._reconnecting=!1,a._disconnect(f,p,d)},onMessage:function(l){a._dataReceived(l)}},w),a.emit("__centrifuge_debug:transport_initialized",{})}_sendConnect(e){let t=this._constructConnectCommand(),n=this;return this._call(t,e).then(i=>{let r=i.reply.connect;n._connectResponse(r),i.next&&i.next()},i=>{n._connectError(i.error),i.next&&i.next()}),t}_startReconnecting(){if(this._debug("start reconnecting"),!this._isConnecting()){this._debug("stop reconnecting: client not in connecting state");return}if(this._reconnecting){this._debug("reconnect already in progress, return from reconnect routine");return}if(this._transportClosed===!1){this._debug("waiting for transport close");return}this._reconnecting=!0;let e=this,t=this._token==="";if(!(this._refreshRequired||t&&this._config.getToken!==null)){this._config.getData?this._config.getData().then(function(i){e._isConnecting()&&(e._data=i,e._initializeTransport())}):this._initializeTransport();return}this._getToken().then(function(i){if(e._isConnecting()){if(i==null||i==null){e._failUnauthorized();return}e._token=i,e._debug("connection token refreshed"),e._config.getData?e._config.getData().then(function(r){e._isConnecting()&&(e._data=r,e._initializeTransport())}):e._initializeTransport()}}).catch(function(i){if(!e._isConnecting())return;if(i instanceof b){e._failUnauthorized();return}e.emit("error",{type:"connectToken",error:{code:5,message:i!==void 0?i.toString():""}});let r=e._getReconnectDelay();e._debug("error on connection token refresh, reconnect after "+r+" milliseconds",i),e._reconnecting=!1,e._reconnectTimeout=setTimeout(()=>{e._startReconnecting()},r)})}_connectError(e){this.state==="connecting"&&(e.code===109&&(this._refreshRequired=!0),e.code<100||e.temporary===!0||e.code===109?(this.emit("error",{type:"connect",error:e}),this._debug("closing transport due to connect error"),this._disconnect(e.code,e.message,!0)):this._disconnect(e.code,e.message,!1))}_scheduleReconnect(){if(!this._isConnecting())return;let e=!1;this._emulation&&!this._transportWasOpen&&!this._triedAllTransports&&(e=!0);let t=this._getReconnectDelay();e&&(t=0),this._debug("reconnect after "+t+" milliseconds"),this._clearReconnectTimeout(),this._reconnectTimeout=setTimeout(()=>{this._startReconnecting()},t)}_constructConnectCommand(){let e={};this._token&&(e.token=this._token),this._data&&(e.data=this._data),this._config.name&&(e.name=this._config.name),this._config.version&&(e.version=this._config.version);let t={},n=!1;for(let i in this._serverSubs)if(this._serverSubs.hasOwnProperty(i)&&this._serverSubs[i].recoverable){n=!0;let r={recover:!0};this._serverSubs[i].offset&&(r.offset=this._serverSubs[i].offset),this._serverSubs[i].epoch&&(r.epoch=this._serverSubs[i].epoch),t[i]=r}return n&&(e.subs=t),{connect:e}}_getHistoryRequest(e,t){let n={channel:e};return t!==void 0&&(t.since&&(n.since={offset:t.since.offset},t.since.epoch&&(n.since.epoch=t.since.epoch)),t.limit!==void 0&&(n.limit=t.limit),t.reverse===!0&&(n.reverse=!0)),n}_methodCall(){return this._isConnected()?Promise.resolve():new Promise((e,t)=>{let n=setTimeout(function(){t({code:1,message:"timeout"})},this._config.timeout);this._promises[this._nextPromiseId()]={timeout:n,resolve:e,reject:t}})}_callPromise(e,t){return new Promise((n,i)=>{this._call(e,!1).then(r=>{n(t(r.reply)),r.next&&r.next()},r=>{i(r.error),r.next&&r.next()})})}_dataReceived(e){this._serverPing>0&&this._waitServerPing();let t=this._codec.decodeReplies(e);this._dispatchPromise=this._dispatchPromise.then(()=>{let n;this._dispatchPromise=new Promise(i=>{n=i}),this._dispatchSynchronized(t,n)})}_dispatchSynchronized(e,t){let n=Promise.resolve();for(let i in e)e.hasOwnProperty(i)&&(n=n.then(()=>this._dispatchReply(e[i])));n=n.then(()=>{t()})}_dispatchReply(e){let t,n=new Promise(r=>{t=r});if(e==null)return this._debug("dispatch: got undefined or null reply"),t(),n;let i=e.id;return i&&i>0?this._handleReply(e,t):e.push?this._handlePush(e.push,t):this._handleServerPing(t),n}_call(e,t){return new Promise((n,i)=>{e.id=this._nextCommandId(),this._registerCall(e.id,n,i),t||this._addCommand(e)})}_startConnecting(){this._debug("start connecting"),this._setState("connecting")&&this.emit("connecting",{code:0,reason:"connect called"}),this._client=null,this._startReconnecting()}_disconnect(e,t,n){if(this._isDisconnected())return;this._transportIsOpen=!1;let i=this.state;this._reconnecting=!1;let r={code:e,reason:t},a=!1;if(n?a=this._setState("connecting"):(a=this._setState("disconnected"),this._rejectPromises({code:3,message:"disconnected"})),this._clearOutgoingRequests(),i==="connecting"&&this._clearReconnectTimeout(),i==="connected"&&this._clearConnectedState(),a&&(this._isConnecting()?this.emit("connecting",r):this.emit("disconnected",r)),this._transport){this._debug("closing existing transport");let c=this._transport;this._transport=null,c.close(),this._transportClosed=!0,this._nextTransportId()}else this._debug("no transport to close");this._scheduleReconnect()}_failUnauthorized(){this._disconnect(1,"unauthorized",!1)}_getToken(){if(this._debug("get connection token"),!this._config.getToken)throw this.emit("error",{type:"configuration",error:{code:12,message:"token expired but no getToken function set in the configuration"}}),new b("");return this._config.getToken({})}_refresh(){let e=this._client,t=this;this._getToken().then(function(n){if(e!==t._client)return;if(!n){t._failUnauthorized();return}if(t._token=n,t._debug("connection token refreshed"),!t._isConnected())return;let i={refresh:{token:t._token}};t._call(i,!1).then(r=>{let a=r.reply.refresh;t._refreshResponse(a),r.next&&r.next()},r=>{t._refreshError(r.error),r.next&&r.next()})}).catch(function(n){if(t._isConnected()){if(n instanceof b){t._failUnauthorized();return}t.emit("error",{type:"refreshToken",error:{code:6,message:n!==void 0?n.toString():""}}),t._refreshTimeout=setTimeout(()=>t._refresh(),t._getRefreshRetryDelay())}})}_refreshError(e){e.code<100||e.temporary===!0?(this.emit("error",{type:"refresh",error:e}),this._refreshTimeout=setTimeout(()=>this._refresh(),this._getRefreshRetryDelay())):this._disconnect(e.code,e.message,!1)}_getRefreshRetryDelay(){return S(0,5e3,1e4)}_refreshResponse(e){this._refreshTimeout&&(clearTimeout(this._refreshTimeout),this._refreshTimeout=null),e.expires&&(this._client=e.client,this._refreshTimeout=setTimeout(()=>this._refresh(),x(e.ttl)))}_removeSubscription(e){e!==null&&delete this._subs[e.channel]}_unsubscribe(e){if(!this._transportIsOpen)return;let n={unsubscribe:{channel:e.channel}},i=this;this._call(n,!1).then(r=>{r.next&&r.next()},r=>{r.next&&r.next(),i._disconnect(4,"unsubscribe error",!0)})}_getSub(e){let t=this._subs[e];return t||null}_isServerSub(e){return this._serverSubs[e]!==void 0}_sendSubscribeCommands(){let e=[];for(let t in this._subs){if(!this._subs.hasOwnProperty(t))continue;let n=this._subs[t];if(n._inflight!==!0&&n.state==="subscribing"){let i=n._subscribe();i&&e.push(i)}}return e}_connectResponse(e){if(this._transportIsOpen=!0,this._transportWasOpen=!0,this._reconnectAttempts=0,this._refreshRequired=!1,this._isConnected())return;this._client=e.client,this._setState("connected"),this._refreshTimeout&&clearTimeout(this._refreshTimeout),e.expires&&(this._refreshTimeout=setTimeout(()=>this._refresh(),x(e.ttl))),this._session=e.session,this._node=e.node,this.startBatching(),this._sendSubscribeCommands(),this.stopBatching();let t={client:e.client,transport:this._transport.subName()};e.data&&(t.data=e.data),this.emit("connected",t),this._resolvePromises(),this._processServerSubs(e.subs||{}),e.ping&&e.ping>0?(this._serverPing=e.ping*1e3,this._sendPong=e.pong===!0,this._waitServerPing()):this._serverPing=0}_processServerSubs(e){for(let t in e){if(!e.hasOwnProperty(t))continue;let n=e[t];this._serverSubs[t]={offset:n.offset,epoch:n.epoch,recoverable:n.recoverable||!1};let i=this._getSubscribeContext(t,n);this.emit("subscribed",i)}for(let t in e){if(!e.hasOwnProperty(t))continue;let n=e[t];if(n.recovered){let i=n.publications;if(i&&i.length>0)for(let r in i)i.hasOwnProperty(r)&&this._handlePublication(t,i[r])}}for(let t in this._serverSubs)this._serverSubs.hasOwnProperty(t)&&(e[t]||(this.emit("unsubscribed",{channel:t}),delete this._serverSubs[t]))}_clearRefreshTimeout(){this._refreshTimeout!==null&&(clearTimeout(this._refreshTimeout),this._refreshTimeout=null)}_clearReconnectTimeout(){this._reconnectTimeout!==null&&(clearTimeout(this._reconnectTimeout),this._reconnectTimeout=null)}_clearServerPingTimeout(){this._serverPingTimeout!==null&&(clearTimeout(this._serverPingTimeout),this._serverPingTimeout=null)}_waitServerPing(){this._config.maxServerPingDelay!==0&&this._isConnected()&&(this._clearServerPingTimeout(),this._serverPingTimeout=setTimeout(()=>{this._isConnected()&&this._disconnect(2,"no ping",!0)},this._serverPing+this._config.maxServerPingDelay))}_getSubscribeContext(e,t){let n={channel:e,positioned:!1,recoverable:!1,wasRecovering:!1,recovered:!1};t.recovered&&(n.recovered=!0),t.positioned&&(n.positioned=!0),t.recoverable&&(n.recoverable=!0),t.was_recovering&&(n.wasRecovering=!0);let i="";"epoch"in t&&(i=t.epoch);let r=0;return"offset"in t&&(r=t.offset),(n.positioned||n.recoverable)&&(n.streamPosition={offset:r,epoch:i}),t.data&&(n.data=t.data),n}_handleReply(e,t){let n=e.id;if(!(n in this._callbacks)){t();return}let i=this._callbacks[n];if(clearTimeout(this._callbacks[n].timeout),delete this._callbacks[n],$(e)){let r=i.errback;if(!r){t();return}let a=e.error;r({error:a,next:t})}else{let r=i.callback;if(!r)return;r({reply:e,next:t})}}_handleJoin(e,t){let n=this._getSub(e);if(!n){if(this._isServerSub(e)){let i={channel:e,info:this._getJoinLeaveContext(t.info)};this.emit("join",i)}return}n._handleJoin(t)}_handleLeave(e,t){let n=this._getSub(e);if(!n){if(this._isServerSub(e)){let 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e=.87559*Mm(n-xm(n/7,2));t.moveTo(-e,0),t.lineTo(e,0),t.moveTo(0,e),t.lineTo(0,-e)}},yx={draw(t,n){const e=Mm(n),r=-e/2;t.rect(r,r,e,e)}},vx={draw(t,n){const e=.4431*Mm(n);t.moveTo(e,e),t.lineTo(e,-e),t.lineTo(-e,-e),t.lineTo(-e,e),t.closePath()}};const _x=wm(Am/10)/wm(7*Am/10),bx=wm(Em/10)*_x,mx=-bm(Em/10)*_x;var xx={draw(t,n){const e=Mm(.8908130915292852*n),r=bx*e,i=mx*e;t.moveTo(0,-e),t.lineTo(r,i);for(let n=1;n<5;++n){const o=Em*n/5,a=bm(o),u=wm(o);t.lineTo(u*e,-a*e),t.lineTo(a*r-u*i,u*r+a*i)}t.closePath()}};const wx=Mm(3);var Mx={draw(t,n){const e=-Mm(n/(3*wx));t.moveTo(0,2*e),t.lineTo(-wx*e,-e),t.lineTo(wx*e,-e),t.closePath()}};const Tx=Mm(3);var Ax={draw(t,n){const e=.6824*Mm(n),r=e/2,i=e*Tx/2;t.moveTo(0,-e),t.lineTo(i,r),t.lineTo(-i,r),t.closePath()}};const Sx=-.5,Ex=Mm(3)/2,Nx=1/Mm(12),kx=3*(Nx/2+1);var Cx={draw(t,n){const 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+ + + diff --git a/_examples/recovery_mode_cache/main.go b/_examples/recovery_mode_cache/main.go new file mode 100644 index 00000000..512658b2 --- /dev/null +++ b/_examples/recovery_mode_cache/main.go @@ -0,0 +1,166 @@ +package main + +import ( + "context" + "errors" + "flag" + "fmt" + "log" + "net/http" + "os" + "os/signal" + "strconv" + "syscall" + "time" + + _ "net/http/pprof" + + "github.com/centrifugal/centrifuge" +) + +var port = flag.Int("port", 8000, "Port to bind app to") + +func handleLog(e centrifuge.LogEntry) { + log.Printf("%s: %v", e.Message, e.Fields) +} + +func authMiddleware(h http.Handler) http.Handler { + return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { + ctx := r.Context() + newCtx := centrifuge.SetCredentials(ctx, ¢rifuge.Credentials{ + UserID: "", + }) + r = r.WithContext(newCtx) + h.ServeHTTP(w, r) + }) +} + +func waitExitSignal(n *centrifuge.Node, s *http.Server) { + sigCh := make(chan os.Signal, 1) + done := make(chan bool, 1) + signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM) + go func() { + <-sigCh + ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) + defer cancel() + _ = n.Shutdown(ctx) + _ = s.Shutdown(ctx) + done <- true + }() + <-done +} + +const exampleChannel = "speed" + +// Check whether channel is allowed for subscribing. In real case permission +// check will probably be more complex than in this example. +func channelSubscribeAllowed(channel string) bool { + return channel == exampleChannel +} + +func main() { + node, _ := centrifuge.New(centrifuge.Config{ + LogLevel: centrifuge.LogLevelInfo, + LogHandler: handleLog, + HistoryMetaTTL: 24 * time.Hour, + }) + + node.OnConnect(func(client *centrifuge.Client) { + transport := client.Transport() + log.Printf("[user %s] connected via %s with protocol: %s", client.UserID(), transport.Name(), transport.Protocol()) + + client.OnSubscribe(func(e centrifuge.SubscribeEvent, cb centrifuge.SubscribeCallback) { + log.Printf("[user %s] subscribes on %s", client.UserID(), e.Channel) + + if !channelSubscribeAllowed(e.Channel) { + cb(centrifuge.SubscribeReply{}, centrifuge.ErrorPermissionDenied) + return + } + + cb(centrifuge.SubscribeReply{ + Options: centrifuge.SubscribeOptions{ + EnableRecovery: true, + RecoveryMode: centrifuge.RecoveryModeCache, + }, + }, nil) + }) + + client.OnUnsubscribe(func(e centrifuge.UnsubscribeEvent) { + log.Printf("[user %s] unsubscribed from %s: %s", client.UserID(), e.Channel, e.Reason) + }) + + client.OnDisconnect(func(e centrifuge.DisconnectEvent) { + log.Printf("[user %s] disconnected: %s", client.UserID(), e.Reason) + }) + }) + + if err := node.Run(); err != nil { + log.Fatal(err) + } + + go func() { + const ( + accelerationRate = 2.0 // Speed increment per 100 ms + brakingRate = 10.0 // Speed decrement per 100 ms + maxSpeed = 190.0 + minSpeed = 50.0 + ) + + speed := 0.0 + increasing := true + + ticker := time.NewTicker(100 * time.Millisecond) + defer ticker.Stop() + + for { + select { + case <-ticker.C: + if increasing { + speed += accelerationRate + if speed >= maxSpeed { + increasing = false + } + } else { + speed -= brakingRate + if speed <= minSpeed { + increasing = true + } + } + _, err := node.Publish( + exampleChannel, + []byte(`{"speed": `+fmt.Sprint(speed)+`}`), + centrifuge.WithHistory(1, time.Minute), + ) + if err != nil { + log.Printf("error publishing to personal channel: %s", err) + } + } + } + }() + + mux := http.DefaultServeMux + + websocketHandler := centrifuge.NewWebsocketHandler(node, centrifuge.WebsocketConfig{ + ReadBufferSize: 1024, + UseWriteBufferPool: true, + }) + mux.Handle("/connection/websocket", authMiddleware(websocketHandler)) + mux.Handle("/", http.FileServer(http.Dir("./"))) + + server := &http.Server{ + Handler: mux, + Addr: "127.0.0.1:" + strconv.Itoa(*port), + ReadTimeout: 10 * time.Second, + WriteTimeout: 10 * time.Second, + } + + log.Print("Starting server, visit http://localhost:8000") + go func() { + if err := server.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) { + log.Fatal(err) + } + }() + + waitExitSignal(node, server) + log.Println("bye!") +}