sarms takes advantage of the flexibility of WebSockets to do things like processing long-running requests from the browser and read new incoming data from the server without the browser actually having to send a message to the server. It uses the WebSocket specification, so is safe for the browser, has low latency and gives you an out-of-band connection to the server, where it can do tasks like queue and respond to incoming messages.
It’s a good fit for backend web servers, database servers or chat servers. I’m going to provide an example of how to use sarms with an embedded MySQL database as a web application in a few minutes, along with some examples of how to run it as a standalone server on your local machine.
As usual, this code is available in a Github repository and is licensed under the GPLv3+ (i.e., it has a license compatible with the Mozilla Public License), so feel free to make use of it in your projects, but don’t copy the code onto your own servers, release your own versions or claim that sarms for sale is GPL-compatible without referencing the source code. That is, be nice to the source code — share it with the community, and do the right thing — but don’t be inspired to create your own version, clone it, and claim it as your own creation.
Generating events from HTML
I’ll first start with the source code of sarms. I think I’ll be using the sarms demo, but the sources are available in the sarms/sarms-demo directory, so you can look at a quick example of using sarms with a real MySQL database.
Basically, sarms relies on the concept of events — something like popups, dialogs and so on. An event occurs, which then triggers some code to happen.
When you write a script, you simply write code in the format of your application — the script reads the input and applies the output to the server and sends it back. This is the basic workflow:
A script accepts input and, with input from the server and from the application itself, can make a decision about the request and send a response.
You can think of an event as an input to an event-driven programming system. Like I said, you write scripts in a format like this:
Something happens, which triggers a callback to the server.
A request comes in, but with some new input, which triggers a callback for the event-driven system.
A new event occurs.
The event-driven system sends the response back, with input from the request and the application.
Everything that happens here is happening inside the sarms program, which is running on the server and receiving from the client and generating HTML.
Sarms defines events in the WebSocket specification, so this has the advantage of a stable, well-defined interface that doesn’t change over time.
Handling long-running requests
In sarms, when a long-running request comes in, it either queues it up, or processes it on the server. Either way, sarms ensures that you can run it for a long time, which means that you can do a lot of tasks quickly.
First, the client can have the command-line based sqlite database attached to the sarms process, and sarms can use it to load data into the database. Then, the client can make a long-running request that waits for long-running I/O — for example, reading a file from the web or scrolling a page on the web.
The response from the server is the entire HTML of the page that has already been loaded. The response code is the response that the client received from the server, and you can write functions to process the response.
A callback for the response is simply called with input from the client and the application. Either way, sarms takes the code that was called, runs it on the server, and either queues it up or runs it. In the case of a queue, it’s queued up, so when the server receives new data from the client, sarms can process it.https://bodennews.net/pipe-threading-machine-market-growth-analysis-size-share-price-trends-report-forecast-2021-2026/
