Simple Graphviz library for Deno

graphviz

Graphviz library for Deno 🦕

Runtime independent APIs and specifications are compatible with the ts-graphviz package.

Usages

Callback style

renderDot function outputs the dot command execution result to the specified path by supplying diagram object.

renderDot function requires allow-write, allow-run permission, and dot command.

import * as path from "https://deno.land/std@0.67.0/path/mod.ts";
import { digraph, attribute, renderDot } from "https://deno.land/x/graphviz/mod.ts";

const G = digraph("G", (g) => {
  const a = g.node("aa");
  const b = g.node("bb");
  const c = g.node("cc");
  g.edge([a, b, c], {
    [attribute.color]: "red",
  });
  g.subgraph("A", (A) => {
    const Aa = A.node("Aaa", {
      [attribute.color]: "pink",
    });
    const Ab = A.node("Abb", {
      [attribute.color]: "violet",
    });
    const Ac = A.node("Acc");
    A.edge([Aa.port({ compass: "c" }), Ab, Ac, "E"], {
      [attribute.color]: "red",
    });
  });
});

const __dirname = new URL(".", import.meta.url).pathname;
await renderDot(G, path.resolve(__dirname, "./example.svg"), {
  format: "svg",
});

Script Style

Convert the diagram object to dot format with toDot function.

import { digraph, toDot } from "https://deno.land/x/graphviz/mod.ts";

const g = digraph("G");

const subgraphA = g.createSubgraph("A");
const nodeA1 = subgraphA.createNode("A_node1");
const nodeA2 = subgraphA.createNode("A_node2");
subgraphA.createEdge([nodeA1, nodeA2]);

const subgraphB = g.createSubgraph("B");
const nodeB1 = subgraphB.createNode("B_node1");
const nodeB2 = subgraphB.createNode("B_node2");
subgraphA.createEdge([nodeB1, nodeB2]);

const node1 = g.createNode("node1");
const node2 = g.createNode("node2");
g.createEdge([node1, node2]);

const dot = toDot(g);
console.log(dot);
digraph "G" {
  "node1";
  "node2";
  subgraph "A" {
    "A_node1";
    "A_node2";
    "A_node1" -> "A_node2";
    "B_node1" -> "B_node2";
  }
  subgraph "B" {
    "B_node1";
    "B_node2";
  }
  "node1" -> "node2";
}

Download Details:

Author: ts-graphviz

Demo: https://deno.land/x/graphviz@v0.2.1

Source Code: https://github.com/ts-graphviz/deno

#deno #nodejs #node #javascript

What is GEEK

Buddha Community

Simple Graphviz library for Deno

Simple Graphviz library for Deno

graphviz

Graphviz library for Deno 🦕

Runtime independent APIs and specifications are compatible with the ts-graphviz package.

Usages

Callback style

renderDot function outputs the dot command execution result to the specified path by supplying diagram object.

renderDot function requires allow-write, allow-run permission, and dot command.

import * as path from "https://deno.land/std@0.67.0/path/mod.ts";
import { digraph, attribute, renderDot } from "https://deno.land/x/graphviz/mod.ts";

const G = digraph("G", (g) => {
  const a = g.node("aa");
  const b = g.node("bb");
  const c = g.node("cc");
  g.edge([a, b, c], {
    [attribute.color]: "red",
  });
  g.subgraph("A", (A) => {
    const Aa = A.node("Aaa", {
      [attribute.color]: "pink",
    });
    const Ab = A.node("Abb", {
      [attribute.color]: "violet",
    });
    const Ac = A.node("Acc");
    A.edge([Aa.port({ compass: "c" }), Ab, Ac, "E"], {
      [attribute.color]: "red",
    });
  });
});

const __dirname = new URL(".", import.meta.url).pathname;
await renderDot(G, path.resolve(__dirname, "./example.svg"), {
  format: "svg",
});

Script Style

Convert the diagram object to dot format with toDot function.

import { digraph, toDot } from "https://deno.land/x/graphviz/mod.ts";

const g = digraph("G");

const subgraphA = g.createSubgraph("A");
const nodeA1 = subgraphA.createNode("A_node1");
const nodeA2 = subgraphA.createNode("A_node2");
subgraphA.createEdge([nodeA1, nodeA2]);

const subgraphB = g.createSubgraph("B");
const nodeB1 = subgraphB.createNode("B_node1");
const nodeB2 = subgraphB.createNode("B_node2");
subgraphA.createEdge([nodeB1, nodeB2]);

const node1 = g.createNode("node1");
const node2 = g.createNode("node2");
g.createEdge([node1, node2]);

const dot = toDot(g);
console.log(dot);
digraph "G" {
  "node1";
  "node2";
  subgraph "A" {
    "A_node1";
    "A_node2";
    "A_node1" -> "A_node2";
    "B_node1" -> "B_node2";
  }
  subgraph "B" {
    "B_node1";
    "B_node2";
  }
  "node1" -> "node2";
}

Download Details:

Author: ts-graphviz

Demo: https://deno.land/x/graphviz@v0.2.1

Source Code: https://github.com/ts-graphviz/deno

#deno #nodejs #node #javascript

Welde Tekle

Welde Tekle

1597865220

A simple WebSocket library like ws of node.js library for deno

deno websocket

🦕 A simple WebSocket library like ws of node.js library for deno

  • Deno >= 1.2

Quick Start

Example Demo

demo

Server side

$ deno run --allow-net https://deno.land/x/websocket@v0.0.3/example/server.ts 

Client side

$ deno run --allow-net https://deno.land/x/websocket@v0.0.3/example/client.ts 
ws connected! (type 'close' to quit)
> something

Usage

Server side

import { WebSocket, WebSocketServer } from "https://deno.land/x/websocket@v0.0.3/mod.ts";

const wss = new WebSocketServer(8080);
wss.on("connection", function (ws: WebSocket) {
  ws.on("message", function (message: string) {
    console.log(message);
    ws.send(message)
  });
});

Client side

import { WebSocket } from "https://deno.land/x/websocket@v0.0.3/mod.ts";
const endpoint = "ws://127.0.0.1:8080";
const ws: WebSocket = new WebSocket(endpoint);
ws.on("open", function() {
  console.log("ws connected!");
});
ws.on("message", function (message: string) {
  console.log(message);
});
ws.send("something");

Documentation

WebSocketServer

Event

event detail
connection Emitted when the handshake is complete
error Emitted when an error occurs

Field

field detail type
server.clients A set that stores all connected clients Set<WebSocket>

Method

method detail
close() Close the server

WebSocket

Event

event detail
open Emitted when the connection is established
close Emitted when the connection is closed
message Emitted when a message is received from the server
ping Emitted when a ping is received from the server
pong Emitted when a pong is received from the server
error Emitted when an error occurs

Field

field detail type
websocket.isClose Get the close flag Boolean

Method

method detail
send(message:string Unit8Array)
ping(message:string Unit8Array)
close([code:int[, reason:string]]) Close the connection with the server
forceClose() Forcibly close the connection with the server

Download Details:

Author: ryo-ma

Demo: https://deno.land/x/websocket@v0.0.3

Source Code: https://github.com/ryo-ma/deno-websocket

#deno #node #nodejs #javascript

Brandon  Adams

Brandon Adams

1625629740

What is a Library? Using Libraries in Code Tutorial | C Library Examples

In this tutorial, we’ll be talking about what a library is and how they are useful. We will be looking at some examples in C, including the C Standard I/O Library and the C Standard Math Library, but these concepts can be applied to many different languages. Thank you for watching and happy coding!

Need some new tech gadgets or a new charger? Buy from my Amazon Storefront https://www.amazon.com/shop/blondiebytes

Also check out…
What is a Framework? https://youtu.be/HXqBlAywTjU
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What is an API? https://youtu.be/T74OdSCBJfw
What are API Keys? https://youtu.be/1yFggyk--Zo
Using APIs with Postman https://youtu.be/0LFKxiATLNQ

Check out my courses on LinkedIn Learning!
REFERRAL CODE: https://linkedin-learning.pxf.io/blondiebytes
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Check out my Python Basics course on Highbrow!
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Want to BINGE?? Check out these playlists…

Quick Code Tutorials: https://www.youtube.com/watch?v=4K4QhIAfGKY&index=1&list=PLcLMSci1ZoPu9ryGJvDDuunVMjwKhDpkB

Command Line: https://www.youtube.com/watch?v=Jm8-UFf8IMg&index=1&list=PLcLMSci1ZoPvbvAIn_tuSzMgF1c7VVJ6e

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Intermediate Web Dev Tutorials: https://www.youtube.com/watch?v=LFa9fnQGb3g&index=1&list=PLcLMSci1ZoPubx8doMzttR2ROIl4uzQbK

GitHub | https://github.com/blondiebytes

Twitter | https://twitter.com/blondiebytes

LinkedIn | https://www.linkedin.com/in/blondiebytes

#blondiebytes #c library #code tutorial #library

Deno Developer

Deno Developer

1597966500

Simple desired state configuration library for Deno

deno-dsc

Simple desired state configuration library for deno. Inspired by Powershell DSC.

What

When you need to get your system into desired state. Quickly, reliably, repeatedly. You can use Ansible, Puppet, Powershell or something else. But this is simple and you can use JavaScript/TypeScript. Deno is the only runtime dependency.

Why

I have built this to spin up my development machine using my dotfiles.

How does it work

Based on your configuration the library build a dependency graph and executes everything missing in right order. Every configuration is first tested and only executed, when the test does not pass. Therefore it is idempotent - you can start it multiple times without worries.

Adding resource

Add configuration type and implement the resource

export interface LoginShellConfig extends Config {
  shell: "zsh";
}

export const LoginShell: Resource<LoginShellConfig> = {
  name: "loginShell",
  get: (config) => {
    //...
  },
  test: async (config, verbose) => {
    //...
  },
  set: async (config, verbose) => {
    //...
  }
};

Add to list of types of resources

type MyResources = Resources | Resource<LoginShellConfig>;

Registr the new resource

registerResource(LoginShell);

Download Details:

Author: lttr

Source Code: https://github.com/lttr/deno-dsc

#deno #nodejs #javascript #node

Andrew French

1605127860

Simple Orm library for Deno based on deno_mysql

Deno Simple Orm

dso is a simple ORM Library based on deno_mysql

Example

import {
  BaseModel,
  Defaults,
  dso,
  Field,
  FieldType,
  CharsetType,
  Index,
  IndexType,
  Join,
  Model,
  Where
} from "https://deno.land/x/dso@v1.0.0/mod.ts";

// Define a database model
@Model("users")
class UserModel extends BaseModel {
  // Character set for whole table. UTF-8 is default and is not necessary to define.
  charset: CharsetType.utf8;

  // The ! operator is needed for primary key since it's never null 
  @Field({
    type: FieldType.INT,
    primary: true,
    length: 11,
    autoIncrement: true
  })
  id: number;

  @Field({ type: FieldType.STRING, length: 30 })
  name: string;

  @Field({ type: FieldType.STRING, length: 30 })
  password: string;

  // Charset can be explicitly defined for each column.
  @Field({ type: FieldType.STRING, length: 60, charset: CharsetType.utf8mb4 })
  namespace: string;

  // Index can be created [index/unique/spatial/fulltext] for each field
  @Field({ type: FieldType.STRING, length: 30, unique: true })
  email: string;

  // Multi column index can be defined by decorated @Index
  @Index({ type: IndexType.UNIQUE, columns: ["username","namespace"] })
  public myUniqueIndex!: Index;
}

const userModel = dso.define(UserModel);

async function main() {
  // The database must be created before linking
  await dso.connect({
    hostname: "127.0.0.1",
    port: 3306,
    username: "root",
    password: "",
    db: "dbname"
  });

  /*  
    When installing or initializing a database,
    you can use dso.sync to synchronize the database model to the database.
    Use false as the parameter if you want to sync only newly added models,
    Use true as the parameter if you want to sync the whole defined models
    to the database tables.

    == WARNING! ==
    Using true as the parameter will reset your whole database! Use with caution.
  */
  await dso.sync(false);

  // You can add records using insert method
  const insertId = await userModel.insert({
    name: "user1",
    password: "password"
  });

  // You can use the Model.findById method to get a record
  const user = await userModel.findById(1);

  // You can use Where clause too to get a record. For more information on
  // clauses such as join, order, etc. please consult:
  // https://github.com/manyuanrong/sql-builder

  // findOne + Where
  const userWhere = await userModel.findOne(Where.from({ name: "user1" }));

  // findAll + Where
  const userAll = await userModel.findAll(Where.from({ name: "user1" }));

  // findAll + expr like
  const userLike = await userModel.findAll(Where.expr("name like 'user%'"));

  console.log("Found user by id:", user);
  console.log("Found user by where eq clause:", userWhere);
  console.log("All users by where eq clause:", userAll);
  console.log("All users by where like clause:", userLike);
  console.log("User has these columns in index:", user.myUniqueIndex.columns);
}
main();

Running

Since this library needs to use Typescript Decorators and other features, a custom tsconfig.json needs to be added. Example config file can be found here, or just copy the contents below and create a new tsconfig.json file in your root directory.

tsconfig.json

{
  "compilerOptions": {
    "allowJs": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "module": "esnext",
    "isolatedModules": false
  }
}

To run, use:

deno run --allow-net -c tsconfig.json main.ts

where main.ts is your Typescript file for Deno.

Top Level API

dso.showQueryLog

Set whether query debugging information is displayed

dso.showQueryLog = true;
dso.connect

You need to use this method to link to the database before you can manipulate the database

await dso.connect({
  hostname: "127.0.0.1", // database hostname
  port: 3306, // database port
  username: "root", // database username
  password: "", // database password
  db: "dbname" // database name. (tips: The database must be created before linking)
});
dso.define()

Add an annotated Model instance and return the instance.

@Model("users")
class UserModel extends BaseModel {
  @Field({
    type: FieldType.INT,
    primary: true,
    length: 11,
    autoIncrement: true
  })
  id!: number;

  @Field({ type: FieldType.STRING, length: 30 })
  name?: string;

  @Field({ type: FieldType.STRING, length: 30 })
  password: string;

  @Field({ 
    type: FieldType.STRING, 
    unique: true, 
    length: 20})
  phoneNumber?: string;
}
}

export default const userModel = dso.define(UserModel);

// userModel.findById(...)
// userModel.findAll(...)
// userModel.findOne(...)
// userModel.insert(...)
// userModel.update(...)
// userModel.delete(...)
dso.sync

When installing or initializing a database, you can use sync to synchronize the database model to the database.

// If set to FORCE, tables will be deleted before they are created,
// otherwise only new models will be synchronized.
const force = true; // force
await dso.sync(force);
dso.transaction(processor: (transaction: Transaction) => Promise): Promise

Create and start a transaction.

New Model instances must be obtained through getModel(Model). Otherwise, it will not be controlled by transactions.

const result = await dso.transaction<boolean>(async trans => {
  const userModel = trans.getModel(UserModel);
  const topicModel = trans.getModel(TopicModel);

  userId = await userModel.insert({ nickName: "foo", password: "bar", phoneNumber: "08135539123" });
  topicId = await topicModel.insert({ title: "zoo", userId });
  return true;
});

Top Level Types

FieldType
  • DATE
  • INT
  • TEXT
  • STRING
  • BOOLEAN
Field

Field type describes the following properties of a field

key type default value desc
type one of the FieldTypes null types of database fields
length number unfixed field length
primary boolean false database primary key?
default any null default values for fields
autoIncrement boolean false identify auto-increment fields. It can only be used for INT types
notNull boolean false identity fields can not be null
autoUpdate boolean false updated automatically according to the current timestamp. It can only be used for DATE types
unique boolean false database unique index?
spatial boolean false database spatial index?
fullText boolean false database fullText index?
index boolean false database non unique index?
Index

Following types of an index are available

key multi column
index true
unique true
spatial false
fulltext true
Character sets

list of valid character sets is based on https://dev.mysql.com/doc/refman/8.0/en/charset-charsets.html

Download Details:

Author: manyuanrong

Source Code: https://github.com/manyuanrong/dso

#deno #node #nodejs #javascript