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Code Issues Releases Wiki Activity

Rename external tasks to external pipes

Browse Source 
And add support for connecting via sockets to existing processers/tasks
This commit is contained in:
Jermolene
2018-10-13 14:50:21 +01:00
parent 2e5035ec2a
commit 97bb1fa8c9
14 changed files with 812 additions and 647 deletions
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core/modules/commands/exec.js
-121
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@@ -1,121 +0,0 @@
/*\
title: $:/core/modules/commands/exec.js
type: application/javascript
module-type: command
Command to execute an external task
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
exports.info = {
name: "exec",
synchronous: false
};
var Command = function(params,commander,callback) {
this.params = params;
this.commander = commander;
this.callback = callback;
};
Command.prototype.execute = function() {
var self = this;
if(this.params.length < 2) {
return "Missing parameters";
}
var name = self.params[0], // External task name
filter = self.params[1], // Filter of tiddlers to pass to the task
args = self.params.slice(2); // Remaining arguments are passed to the task arguments
// Find the task information
var taskInfo = ($tw.boot.wikiInfo["external-tasks"] || {})[name];
if(!taskInfo) {
return this.callback("External task \"" + name + "\" not found");
}
// Execute it
var spawn = require("child_process").spawn,
path = require("path"),
childProcess = spawn(path.resolve($tw.boot.wikiPath,taskInfo.path),args,{
stdio: ["pipe","pipe",process.stderr],
shell: true,
env: $tw.utils.extend({},process.env,taskInfo.environment)
});
// Choose the input representation
var taskInfoInput = taskInfo.input || {},
data;
switch(taskInfoInput.format || "json-raw-tiddlers") {
case "rendered-text":
var titles = self.commander.wiki.filterTiddlers(filter),
output = [];
$tw.utils.each(titles,function(title) {
output.push(self.commander.wiki.renderTiddler("text/plain",title));
});
data = output.join("");
break;
case "json-rendered-text-tiddlers":
var titles = self.commander.wiki.filterTiddlers(filter),
tiddlers = [];
$tw.utils.each(titles,function(title) {
tiddlers.push({
title: title,
text: self.commander.wiki.renderTiddler("text/plain",title)
})
});
data = JSON.stringify(tiddlers);
break;
case "json-raw-tiddlers":
// Intentional fall-through
default:
data = this.commander.wiki.getTiddlersAsJson(filter);
break;
}
if(data === undefined) {
return this.callback("No input data defined for tiddler processor");
}
// Pass the tiddlers as JSON over stdin
childProcess.stdin.write(data);
childProcess.stdin.end();
// Catch the output
var chunks = [];
childProcess.stdout.on("data",function(chunk) {
chunks.push(chunk.toString());
});
// Pick up the output when the process ends
childProcess.once("exit",function(code) {
if(code !== 0) {
return self.callback("Error executing external task: " + code);
}
var childOutput = chunks.join(""),
taskInfoOutput = taskInfo.output || {},
data;
switch(taskInfoOutput.format || "text") {
case "json-raw-tiddlers":
try {
data = JSON.parse(childOutput);
} catch(e) {
self.callback("Error parsing returned JSON: " + e + "\n\n\n->\n" + childOutput);
}
// Add the tiddlers
self.commander.wiki.addTiddlers(data);
break;
case "text":
// Intentional fall-through
default:
self.commander.wiki.addTiddler(new $tw.Tiddler(taskInfoOutput.tiddler,{
text: childOutput
}));
break;
}
// Exit successfully
self.callback(null);
});
return null;
};
exports.Command = Command;
})();
core/modules/commands/pipe.js
+194
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@@ -0,0 +1,194 @@
/*\
title: $:/core/modules/commands/pipe.js
type: application/javascript
module-type: command
Command to execute an external task
\*/
(function(){
/*jslint node: true, browser: true */
/*global $tw: false */
"use strict";
exports.info = {
name: "pipe",
synchronous: false
};
var Command = function(params,commander,callback) {
this.params = params;
this.commander = commander;
this.callback = callback;
};
Command.prototype.execute = function() {
var self = this;
if(this.params.length < 2) {
return "Missing parameters";
}
var name = self.params[0], // External pipe name
filter = self.params[1], // Filter of tiddlers to write to the pipe
args = self.params.slice(2); // Remaining arguments are passed on as tasks arguments
// Find the pipe information
var pipeInfo = ($tw.boot.wikiInfo["external-pipes"] || {})[name];
if(!pipeInfo) {
return this.callback("External pipe \"" + name + "\" not found");
}
// Get the outgoing data
var data = this.composeOutgoingData(filter,pipeInfo);
// Connect to the pipe
var options = {
args: args,
data: data
};
switch(pipeInfo.type) {
case "task":
return this.pipeExternalTask(pipeInfo,options);
case "socket":
return this.pipeSocket(pipeInfo,options);
default:
return "Invalid pipe specifier '" + name + "'"
}
};
Command.prototype.log = function(args) {
this.commander.log("Pipe: " + Array.prototype.slice.call(arguments,0).join(" "));
};
Command.prototype.pipeExternalTask = function(pipeInfo,options) {
var self = this,
spawn = require("child_process").spawn,
path = require("path"),
childProcess = spawn(path.resolve($tw.boot.wikiPath,pipeInfo.path),options.args,{
stdio: ["pipe","pipe",process.stderr],
shell: true,
env: $tw.utils.extend({},process.env,pipeInfo.environment)
});
// Pass the tiddlers over the outgoing stream
childProcess.stdin.on("error",function(err) {
self.log("Task stdin error",err)
});
childProcess.stdin.write(options.data);
childProcess.stdin.end();
// Catch the output
var chunks = [];
childProcess.stdout.on("data",function(chunk) {
chunks.push(chunk.toString());
});
childProcess.stdout.on("close",function() {
self.log("Task stdout close");
self.processIncomingData(chunks.join(""),pipeInfo);
});
childProcess.stdout.on("error",function(err) {
self.log("Task stdout error",err)
});
// Pick up the output when the process ends
childProcess.on("error",function(err) {
self.log("Task error",err)
});
childProcess.on("exit",function(code,signal) {
self.log("Task exit",code,signal)
if(code !== 0) {
return self.callback("Error executing external task: " + code);
}
// Exit successfully
self.callback(null);
});
return null;
};
Command.prototype.pipeSocket = function(pipeInfo,options) {
var self = this,
net = require("net"),
socket = new net.Socket({
allowHalfOpen: true
}),
chunks = [];
socket.connect(pipeInfo.port,pipeInfo.host || 8081,function() {
self.log("Socket connection",pipeInfo.port,pipeInfo.host);
socket.write(options.data);
socket.end();
});
socket.on("error",function(e) {
self.log("Socket error",e)
});
socket.on("data",function(data) {
chunks.push(data.toString());
});
socket.on("end",function() {
self.processIncomingData(chunks.join(""),pipeInfo);
self.log("Socket end");
socket.destroy();
});
// Add a "close" event handler for the client socket
socket.on("close",function() {
self.log("Socket closed");
return self.callback(null);
});
return null;
};
Command.prototype.composeOutgoingData = function(filter,pipeInfo) {
var self = this,
pipeInfoInput = pipeInfo.input || {},
data;
switch(pipeInfoInput.format || "json-raw-tiddlers") {
case "rendered-text":
var titles = self.commander.wiki.filterTiddlers(filter),
output = [];
$tw.utils.each(titles,function(title) {
output.push(self.commander.wiki.renderTiddler("text/plain",title));
});
data = output.join("");
break;
case "json-rendered-text-tiddlers":
var titles = self.commander.wiki.filterTiddlers(filter),
tiddlers = [];
$tw.utils.each(titles,function(title) {
tiddlers.push({
title: title,
text: self.commander.wiki.renderTiddler("text/plain",title)
})
});
data = JSON.stringify(tiddlers);
break;
case "json-raw-tiddlers":
// Intentional fall-through
default:
data = this.commander.wiki.getTiddlersAsJson(filter);
break;
}
return data;
};
Command.prototype.processIncomingData = function(data,pipeInfo) {
var self = this,
pipeInfoOutput = pipeInfo.output || {},
jsonData;
switch(pipeInfoOutput.format || "text") {
case "json-raw-tiddlers":
try {
jsonData = JSON.parse(data);
} catch(e) {
self.log("Error parsing returned JSON: " + e + "\n\n\n->\n" + data);
}
// Add the tiddlers
if(jsonData) {
this.commander.wiki.addTiddlers(jsonData);
}
break;
case "text":
// Intentional fall-through
default:
this.commander.wiki.addTiddler(new $tw.Tiddler(pipeInfoOutput.tiddler,{
text: data
}));
break;
}
};
exports.Command = Command;
})();
editions/dev/tiddlers/new/External Shell Tasks.tid
-131
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@@ -1,131 +0,0 @@
created: 20181001171604072
modified: 20181001184306738
title: External Shell Tasks
type: text/vnd.tiddlywiki
!! Introduction
It can be difficult for experienced developers to become proficient in working with TiddlyWiki's code: besides requiring a good understanding of JavaScript, the internals are built around relatively unusual concepts and techniques that are likely to be unfamiliar to most.
However, many software developers are very familiar with using and creating text-based command line tools that adhere to the Unix philosophy of using stdin/stdout for input and output, allowing tools to be chained together in powerful ways.
The external task mechanism allows Unix-style tasks to be registered and executed by TiddlyWiki under Node.js. Execution can be triggered via a server command or via a message propagated from the browser.
!! Configuration
External tasks must be registered in the `tiddlywiki.info` file of a wiki folder. For example:
```
{
"description": "Edition demonstrating external tasks",
"plugins": [
],
"themes": [
"tiddlywiki/vanilla",
"tiddlywiki/snowwhite"
],
"includeWikis": [
"../tw5.com"
],
"external-tasks": {
"stats": {
"path": "./demo-tasks/stats.js",
"input": {
"format": "json-raw-tiddlers"
},
"environment": {
"MY_VARIABLE": "value"
},
"output": {
"format": "json-raw-tiddlers"
},
"timeout": 100
},
"mimic": {
"path": "./demo-tasks/mimic.js",
"arguments": ["ngram-length"],
"input": {
"format": "rendered-text"
},
"environment": {
"MY_VARIABLE": "value"
},
"output": {
"format": "text",
"tiddler": {
"title": "HelloThere",
"type": "text/plain"
}
},
"timeout": 100
}
}
}
```
!!! Task Configuration Properties
TBD
!!! Input Formats
The available input formats are:
* `raw-text` - concatenated raw text of the tiddlers
* `rendered-text` - concatenated rendered text of the tiddlers
* `rendered-html` - concatenated rendered html of the tiddlers
* `json-raw-tiddlers` - raw tiddlers in JSON
* `json-rendered-text-tiddlers` - rendered tiddlers in JSON
!!! Output Formats
The available output formats include:
* `raw-text` - raw text
* `json-raw-tiddlers` - raw tiddlers in JSON
!! Usage
External tasks can be invoked via the `--exec` command, or via a widget message propagated from the browser to the server.
!!! `--exec` Command
The `--exec` command triggers the execution of an external task. The parameters are:
```
tiddlywiki <wikifolder> --exec <taskname> <filter> <arguments>...
```
The ''taskname'' identifies the task to be run, and must match the name defined in the `tiddlywiki.info` file.
The ''filter'' identifies the tiddlers to be passed to the external task
The remaining ''arguments'' are passed through to the external task.
!!! `tm-exec-task` Message
TBD
!! Examples
The edition `editions/externaltasksdemo` in the TiddlyWiki5 repo contains a demo wiki that invokes sample tasks.
!!! Mimic
The `mimic.js` example is a simple command line tool that accepts source text via stdin and outputs a sort of statistical parody of the input text. It is written without any knowledge of TiddlyWiki, and so serves as an example of using an existing text-based tool with TiddlyWiki.
```
tiddlywiki editions/externaltasksdemo/ --exec mimic '[[Alice in Wonderland]]' 5 4000 --build index
```
View the resulting wiki at `editions/externaltaskdemo/output/index.html`: the tiddler "HelloThere" will contain a garbled version of the "Alice in Wonderland" text.
!!! Stats
The `stats.js` example is a simple command line tool that accepts source text via stdin and outputs a sort of statistical parody of the input text. It is written without any knowledge of TiddlyWiki, and so serves as an example of using an existing text-based tool with TiddlyWiki.
```
tiddlywiki editions/externaltasksdemo/ --exec stats '[[Alice in Wonderland]]' --build index
```
View the resulting wiki at `editions/externaltaskdemo/output/index.html`: the tiddler "HelloThere" will contain statistics about the "Alice in Wonderland" text.
editions/dev/tiddlers/new/pipes/External Pipes.tid
+121
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@@ -0,0 +1,121 @@
created: 20181001171604072
modified: 20181001184306738
title: External Pipes
type: text/vnd.tiddlywiki
!! Introduction
The external pipes mechanism is intended to address the fact that it can be difficult for experienced developers to quickly get started working with TiddlyWiki's code because it requires a good understanding of JavaScript, and some relatively unusual concepts and techniques that are likely to be unfamiliar to most.
Many software developers are comfortable using and building text-based command line tools that follow the Unix philosophy of using stdin/stdout or TCP sockets for input and output, allowing tools to be chained together in powerful ways.
External pipes support data transfer with external programs via two techniques:
* By directly executing the program and communicating with it via stdin and stdout ([[mimic.js|External Pipes mimic.js]] and [[stats.js|External Pipes stats.js]])
* By connecting to an existing TCP socket via a host address and port ([[reverser.js|External Pipes reverser.js]])
Pipes are registered and executed under Node.js. Execution can be triggered via a server command or via a message propagated from the browser.
Pipes currently support a simple question/response model:
* TiddlyWiki opens a connection to the host/port, or starts the external task
* TiddlyWiki sends the outgoing data through the pipe
* TiddlyWiki receives the incoming data through the pipe
* The connection is close, or the external task exits
!! `externalpipesdemo` Edition
The edition at `editions/externalpipesdemo` in the TiddlyWiki 5 repo contains the example tasks referenced in this documentation.
!! Configuration
Pipes must be registered in the `tiddlywiki.info` file of a wiki folder. For example:
{{External Pipes tiddlywiki.info}}
!!! Task Configuration Properties
TBD
!!! Input Formats
The available input formats are:
* `raw-text` - concatenated raw text of the tiddlers
* `rendered-text` - concatenated rendered text of the tiddlers
* `rendered-html` - concatenated rendered html of the tiddlers
* `json-raw-tiddlers` - raw tiddlers in JSON
* `json-rendered-text-tiddlers` - rendered tiddlers in JSON
!!! Output Formats
The available output formats include:
* `raw-text` - raw text
* `json-raw-tiddlers` - raw tiddlers in JSON
!! Usage
Pipes can be invoked via the `--pipe` command, or via a widget message propagated from the browser to the server.
!!! `--pipe` Command
The `--pipe` command triggers the invocation of a pipe task. The parameters are:
```
tiddlywiki <wikifolder> --pipe <pipename> <filter> <arguments>...
```
The ''pipename'' identifies the pipe, and must match the name defined in the `tiddlywiki.info` file.
The ''filter'' identifies the tiddlers to be passed to the pipe
The remaining ''arguments'' are passed through to external task pipes, and ignored for other types of pipe.
!!! `tm-exec-task` Message
TBD
!! Examples
The edition `editions/externalpipesdemo` in the TiddlyWiki5 repo contains a demo wiki that invokes sample tasks.
!!! Mimic
The `mimic.js` example is a simple command line tool that accepts source text via stdin and outputs a sort of statistical parody of the input text. It is written without any knowledge of TiddlyWiki, and so serves as an example of using an existing text-based tool with TiddlyWiki.
```
tiddlywiki editions/externalpipesdemo/ --verbose --pipe mimic '[[Alice in Wonderland]]' 5 4000 --build index
```
View the resulting wiki at `editions/externaltaskdemo/output/index.html`: the tiddler "HelloThere" will contain a garbled version of the "Alice in Wonderland" text.
!!! Stats
The `stats.js` example is a simple command line tool that accepts source text via stdin and outputs a sort of statistical parody of the input text. It is written without any knowledge of TiddlyWiki, and so serves as an example of using an existing text-based tool with TiddlyWiki.
```
tiddlywiki editions/externalpipesdemo/ --verbose --pipe stats '[[Alice in Wonderland]]' --build index
```
View the resulting wiki at `editions/externaltaskdemo/output/index.html`: the tiddler "HelloThere" will contain statistics about the "Alice in Wonderland" text.
!!! Reverser
The `reverser.js` example is an simple command line tool that listens for connections on a host address and port, accepts source text and then returns the same text with the characters reversed.
Two separate commands are needed to run the sample: one to get the server running, and the second to run TiddlyWiki and invoke the server.
To run the server, open a command prompt in the `demo-tasks` directory and run:
```
../reverser.js 8081
```
And then in another command prompt in the root of the repo run:
```
tiddlywiki editions/externalpipesdemo/ --verbose --pipe reverser '[[Alice in Wonderland]]' --build index
```
View the resulting wiki at `editions/externaltaskdemo/output/index.html`: the tiddler "HelloThere" will contain the reversed text of "Alice in Wonderland".
editions/dev/tiddlers/new/pipes/external-references/tiddlywiki.files
+32
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@@ -0,0 +1,32 @@
{
"tiddlers": [
{
"file": "../../../../../externalpipesdemo/tiddlywiki.info",
"fields": {
"type": "text/plain",
"title": "External Pipes tiddlywiki.info"
}
},
{
"file": "../../../../../externalpipesdemo/demo-tasks/mimic.js",
"fields": {
"type": "application/javascript",
"title": "External Pipes mimic.js"
}
},
{
"file": "../../../../../externalpipesdemo/demo-tasks/reverser.js",
"fields": {
"type": "application/javascript",
"title": "External Pipes reverser.js"
}
},
{
"file": "../../../../../externalpipesdemo/demo-tasks/stats.js",
"fields": {
"type": "application/javascript",
"title": "External Pipes stats.js"
}
}
]
}
editions/externaltasksdemo/demo-tasks/mimic.js → editions/externalpipesdemo/demo-tasks/mimic.js
View File
editions/externalpipesdemo/demo-tasks/readme.md
+3
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@@ -0,0 +1,3 @@
# Sample Processes for TiddlyWiki External Pipes
"External Pipes" are connections enabling a wiki to communicate with an external process to perform arbitrary processing on a group of tiddlers.
editions/externalpipesdemo/demo-tasks/reverser.js
Executable
+49
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@@ -0,0 +1,49 @@
#!/usr/bin/env node
/*
A socket server that listens on a host/port for connections and reverses the order of incoming text
reverser.js <port> <host>
This utility is provided as an example of using an external task that doesn't have any prior knowledge of
TiddlyWiki. Like many Unix utilities, it just reads and writes to a socket.
*/
var net = require("net"),
port = parseInt(process.argv[2] || "",10) || 8081, // Port
host = process.argv[3] || "127.0.0.1"; // Host
var server = net.createServer({
allowHalfOpen: true
});
server.listen(port,host);
server.on("connection", function(sock) {
console.log("CONNECTED: " + sock.remoteAddress +":"+ sock.remotePort);
// Trap errors
sock.on("error",function(e) {
console.log("ERROR: " + e);
});
// Read data until the end
var chunks = [];
sock.on("data",function(data) {
console.log("DATA " + sock.remoteAddress + ": " + data);
chunks.push(data.toString());
});
sock.on("end",function() {
console.log("END")
// Write the data back to the socket
sock.write(reverse(chunks.join("")));
sock.end();
});
sock.on("close", function(data) {
console.log("CLOSED: " + sock.remoteAddress +" "+ sock.remotePort);
});
});
function reverse(str) {
return str.split("").reverse().join("");
}
editions/externaltasksdemo/demo-tasks/stats.js → editions/externalpipesdemo/demo-tasks/stats.js
View File
editions/externaltasksdemo/tiddlers/system/DefaultTiddlers.tid → editions/externalpipesdemo/tiddlers/system/DefaultTiddlers.tid
View File
editions/externaltasksdemo/tiddlywiki.info → editions/externalpipesdemo/tiddlywiki.info
+50 -21
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@@ -1,5 +1,5 @@
{
"description": "Edition demonstrating external tasks",
"description": "Edition demonstrating external pipes",
"plugins": [
],
"themes": [
@@ -9,29 +9,14 @@
"includeWikis": [
"../tw5.com"
],
"external-tasks": {
"stats": {
"path": "./demo-tasks/stats.js",
"input": {
"format": "json-raw-tiddlers"
},
"environment": {
"MY_VARIABLE": "value"
},
"output": {
"format": "json-raw-tiddlers"
},
"timeout": 100
},
"mimic": {
"path": "./demo-tasks/mimic.js",
"arguments": ["ngram-length"],
"external-pipes": {
"reverser": {
"type": "socket",
"host": "127.0.0.1",
"port": 8081,
"input": {
"format": "rendered-text"
},
"environment": {
"MY_VARIABLE": "value"
},
"output": {
"format": "text",
"tiddler": {
@@ -39,6 +24,50 @@
"type": "text/plain"
}
},
"environment": {
"MY_VARIABLE": "value"
},
"timeout": 100
},
"stats": {
"type": "task",
"path": "./demo-tasks/stats.js",
"input": {
"format": "json-raw-tiddlers"
},
"output": {
"format": "json-raw-tiddlers"
},
"error": {
"format": "text",
"tiddler": {
"title": "HelloThere",
"type": "text/plain",
"result": "error"
}
},
"environment": {
"MY_VARIABLE": "value"
},
"timeout": 100
},
"mimic": {
"type": "task",
"path": "./demo-tasks/mimic.js",
"arguments": ["ngram-length"],
"input": {
"format": "rendered-text"
},
"output": {
"format": "text",
"tiddler": {
"title": "HelloThere",
"type": "text/plain"
}
},
"environment": {
"MY_VARIABLE": "value"
},
"timeout": 100
}
}
editions/externaltasksdemo/demo-tasks/readme.md
-4
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@@ -1,4 +0,0 @@
# Sample External Tasks for TiddlyWiki
"External Tasks" are external shell commands that can be triggered from within TiddlyWiki to perform arbitrary processing on a group of tiddlers.
editions/tw5.com/tiddlers/demonstrations/Alice in Wonderland License.tid
+360
View File
@@ -0,0 +1,360 @@
title: Alice in Wonderland License
tags: text/plain
End of Project Gutenberg's Alice's Adventures in Wonderland, by Lewis Carroll
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