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Invoke hook when server starts (#3024)

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* Invoke hook when server starts

Invokes the `th-server-command-start` hook when the server is started, with the server object as the parameter. This allows adding a WebSocket listener to the server.

* Return the HTTP server from the listen function

Returns the node HTTP server created in the listen function to allow extension

* Add node HTTP server to server-command-start hook

* Change hook to post start in case we add a pre-start hook

* Create Hook__th-server-command-post-start.tid
This commit is contained in:
Arlen22 2018-04-10 15:55:54 -05:00 committed by Jeremy Ruston
parent 3af0487f29
commit 2163302190
2 changed files with 21 additions and 2 deletions
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5
core/modules/commands/server.js
View File

@ -143,7 +143,7 @@ SimpleServer.prototype.requestHandler = function(request,response) {
};
SimpleServer.prototype.listen = function(port,host) {
http.createServer(this.requestHandler.bind(this)).listen(port,host);
return http.createServer(this.requestHandler.bind(this)).listen(port,host);
};
var Command = function(params,commander,callback) {
@ -302,13 +302,14 @@ Command.prototype.execute = function() {
password: password,
pathprefix: pathprefix
});
this.server.listen(port,host);
var nodeServer = this.server.listen(port,host);
$tw.utils.log("Serving on " + host + ":" + port,"brown/orange");
$tw.utils.log("(press ctrl-C to exit)","red");
// Warn if required plugins are missing
if(!$tw.wiki.getTiddler("$:/plugins/tiddlywiki/tiddlyweb") || !$tw.wiki.getTiddler("$:/plugins/tiddlywiki/filesystem")) {
$tw.utils.warning("Warning: Plugins required for client-server operation (\"tiddlywiki/filesystem\" and \"tiddlywiki/tiddlyweb\") are missing from tiddlywiki.info file");
}
$tw.hooks.invokeHook('th-server-command-post-start', this.server, nodeServer);
return null;
};

18
editions/dev/tiddlers/new/Hook__th-server-command-post-start.tid Normal file
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@ -0,0 +1,18 @@
created: 20180409142128584
modified: 20180409142128584
tags: HookMechanism
title: Hook: th-server-command-post-start
type: text/vnd.tiddlywiki
This hook allows plugins to extend the TiddlyWiki server command after it initializes. The two
most obvious use cases are adding routes (such as an attachments folder for external files)
to the SimpleServer instance and adding a websockets handler to the HTTP server.
Hook function parameters:
* SimpleServer instance
** Defined in core/modules/commands/server.js
* NodeJS HTTP Server instance
** See the NodeJS docs at [ext[https://nodejs.org/docs/latest-v8.x/api/http.html#http_class_http_server]]
Return value is ignored.