frp | 易学教程

How can I subscribe to the completion of a command's execution signals without a nested subscription?

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问题 I tried the following without success. The equivalent using -subscribeNext: works as expected. // A [[_viewModel.loginCommand.executionSignals flatten] subscribeCompleted:^{ NSLog(@"A"); }]; My only working implementation is as follows: // B [_viewModel.loginCommand.executionSignals subscribeNext:^(RACSignal *loginSignal) { [loginSignal subscribeCompleted:^{ NSLog(@"B"); }]; }]; Why doesn't -flatten work in "A", and how I can I rewrite "B" to not use a nested subscription? 回答1: The -flatten

Rxjs observing object updates and changes

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I am currently trying to observe any changes to a given object including all of it's elements. The following code only fires when an object[x] is updates, but not if individually updating object[x]'s elements such as object[x][y] <script> var elem = document.getElementById("test1"); var log = function(x) { elem.innerHTML += x + "<br/><br/><br/>"; }; var a = [{a:1,b:2}, {a:2,b:5} ]; var source = Rx.Observable .ofObjectChanges(a) .map(function(x) { return JSON.stringify(x); }); var subscription = source.subscribe( function (x) {log(x);}, function (err) {log(err);}, function () {log('Completed');

Simpler alternative libs to Reactive? (Haskell)

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问题 I'm learning Haskell, and trying to write some event-driven programs. The following code is from the tutorial: http://www.haskell.org/haskellwiki/OpenGLTutorial2 main = do (progname,_) <- getArgsAndInitialize initialDisplayMode $= [DoubleBuffered] createWindow "Hello World" reshapeCallback $= Just reshape angle <- newIORef (0.0::GLfloat) -- 1 delta <- newIORef (0.1::GLfloat) -- 2 position <- newIORef (0.0::GLfloat, 0.0) -- 3 keyboardMouseCallback $= Just (keyboardMouse delta position)

How to manage state without using Subject or imperative manipulation in a simple RxJS example?

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问题 I have been experimenting with RxJS for two weeks now, and although I love it in principle I just cannot seem to find and implement the correct pattern for managing state. All articles and questions appear to agree: Subject should be avoided where possible in favor of just pushing state through via transformations; .getValue() should be deprecated entirely; and .do should perhaps be avoided except for DOM manipulation? The problem with all such suggestions is that none of the literature

Chaining promises with RxJS

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I'm new to RxJS and FRP in general. I had the idea of converting an existing promise chain in my ExpressJS application to be an observable for practice. I am aware that this probably isn't the best example but maybe someone can help shed some light. What I'm trying to do : I have two promises - prom1 and prom2 I want prom1 to run before prom2 If prom1 sends a reject(err), I want to cancel prom2 before it starts. I want the error message prom1 returns to be available to the onError method on the observer. var prom1 = new Promise(function(resolve, reject) { if (true) { reject('reason'); }

How do I get the current time in Elm 0.17/0.18?

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I had asked this question already: How do I get the current time in Elm? And answered it by writing my own ( now deprecated ) variant of start-app: http://package.elm-lang.org/packages/z5h/time-app/1.0.1 Of course the Elm architecture has since changed, and my old way of doing things no longer works, because there are no signals or Time.timestamp . So.... Suppose I build an app with the standard update function signature: update : Msg -> Model -> (Model, Cmd Msg) I'd like to timestamp my model with the time at update. One unacceptable almost-solution is to subscribe to Time.every .

[笔记] 使用frp从外网访问内网

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之前尝试过 otunnel ，也记录过使用方法，见 [笔记] 使用otunnel从外网访问内网，但是用了几天发现还是不够稳定。然后尝试 frp ，发现性能稳定，够用，将过程及配置分享在这里吧。需求内网机器没有公网IP，但是可以访问外网，现在需要从外网访问内网机器。举例，在家里机器A访问公司内网机器B。前提需要一台有公网IP的服务器S做中转，这样就可以打通AB两端了。 A <---> S <---> B 环境家中A机，Win10 服务器S，Ubuntu 16.04 LTS 64 bit，公网IP: 123.12.23.13 (举例而已)，SSH 端口: 22 内网B机，Ubuntu 18.04 LTS 64 bit，内网IP: 192.168.2.3 (举例而已)，SSH 端口: 1122，用户名: shit 工具大牛fatedier开发的 frp ，官网介绍如下：“frp 是一个可用于内网穿透的高性能的反向代理应用，支持 tcp, udp 协议，为 http 和 https 应用协议提供了额外的能力，且尝试性支持了点对点穿透。” 下载链接： frp ，支持Mac,FreeBSD,Linux,OpenBSD,Windows等平台，当前最新版本是 v0.28.2 教程 frp架构如下，在服务器上运行frps，在客户机上运行frpc。官方教程： frp用法

FRP - Event streams and Signals - what is lost in using just signals?

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问题 In recent implementations of Classic FRP, for instance reactive-banana, there are event streams and signals, which are step functions (reactive-banana calls them behaviours but they are nevertheless step functions). I've noticed that Elm only uses signals, and doesn't differentiate between signals and event streams. Also, reactive-banana allows to go from event streams to signals (edited: and it's sort of possible to act on behaviours using reactimate' although it not considered good practice

frp内网穿透搭建

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Frp 项目主页 https://github.com/fatedier/frp/blob/master/README_zh.md 来源： https://blog.csdn.net/onionm/article/details/100102535

树莓派 frp 内网穿透

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目标：因为家里没有公网IP，不能像访问云服务器一样访问家里的树莓派，所以目标是外网用SSH、VNC访问家里局域网中的树莓派。工作原理的个人理解：在云主机上运行frp服务器，在树莓派上运行frp客户端，使他们连接起来，通过访问云主机暴露出来IP：PORT来访问云主机，再由云主机转发到它连接的树莓派。材料： 1. 一台有公网IP的云主机 2. 一个树莓派 https://github.com/fatedier/frp/releases 在上面网站根据自己的机器下载对应版本的frp 云主机的： frp_0.17.0_linux_amd64.tar.gz 树莓派的（注意是arm）： frp_0.17.0_linux_arm.tar.gz frp包内容：其中frpc...的三个文件是frp客户端，frps...的三个文件是frp服务器端。配置：云主机：在云主机上配置frps.ini [common] bind_port = 7000 # 不变 dashboard_port = 8030 # 需要是云主机开放的端口，用于进入frp后台的 dashboard_user = frp-gao # 进入frp后台的用户名 dashboard_pwd = 1998 # 进入frp后台的密码 privilege_token = 1998 # 这个需要和frpc中的token保持一致启动：