go-grapher

gographer

Simple graph package for go. Uses d3.js for visualization and websockets for communication.

Gopher image by [Renee French][rf], licensed under [Creative Commons 3.0 Attributions license][cc3-by].

IMPORTANT – This repo is under active developement and should not be used in production until we acheive v1.0.0 Our initial release is 0.1.0 which is unstable at best. https://semver.org/

This package is a fork from “github.com/fjukstad/gographer”

We fixed various websocket issues. The default is golang’s standard lib for websockets. Also all relavant methods have been consolidated into one file. Once it hits v 1.0 consider it stable and production ready. Our goal is to use this repo to build out a richer set of visualazions based on d3js and then produce a scalable graph db using go.

Using it:

Step 1) create a golang project.

Step 2) copy the below file into the root and call it main.go

package main

import (
	"fmt"
	"github.com/raymondbernard/go-grapher/gographer"
	"net/http"
	"os"
)

func main() {
	// make sure you set you export your gopath!
	gopath := os.Getenv("GOPATH")

	rootServeDir := gopath + "/pkg/mod/github.com/raymondbernard/go-grapher@v0.1.0/root_serve_dir/"
	// make sure the rootServerDir exsists!
	// If not, at your command pront in your root  > go get github.com/raymondbernard/go-grapher
	fmt.Println(rootServeDir)

	// init graph
	graph := gographer.NewG()

	// Create graph nodes
	// (ID, NodeText, GroupID, Size)
	graph.AddNode(1, "Node Text blah", 1234, 1)
	graph.AddNode(2, "Node Text blah 2", 1234, 1)

	// Create graph relationships with edges
	// (Source, Target, EdgeID, weight)
	graph.AddEdge(1, 2, 0, 1)
	graph.AddEdge(2, 1, 100, 15)

	// graph.json represent the graph you created
	graph.DumpJSON("graph.json")
	// server up graph on port 8080
	http.ListenAndServe(":8080", http.FileServer(http.Dir(".")))
}

Step 3) Run the two golang commands in your project’s root.

    go mod init 

    go mod tidy

4) Open browser:

Open [localhost:8080](http://localhost:8080) in a webbrowser to view the graph.


Modify the d3js implementation and visualization to your preferences.

Package File location:

All files for our pkgs are kept below
gopath + "/pkg/mod/github.com/raymondbernard/go-grapher@v0.1.0/"

Sample vizualization Tests

• test_graph/visualizer.go contains source code to host the visualizations. They are polulated automatically.
• test_graph/graphtest.go contains source code to host the visualizations. This is the sample file which creates two nodes.
• test_graph/fixed_layout.go contains source code to host the visualizations. This sample file crates a fixed layout. I The d3 graph stops moving after a sec or two.

How to run a graph test

go run /pkg/mod/github.com/raymondbernard/go-grapher@v0.1.0/test_graph/visualization.go or better yet copy the contents of the test_graph into your local test folder of your go project.

Make sure you are not already runing a process on port 8080 or 3999 (this one is reserved for our websocket communications)

Then visit localhost:8080 in your browser :)

Core Lib

• gographer/gographer.go contains source code to get started with our graph library

Web files

• root_serve_dir/index.html contains the empty shell for the visualization
• root_serve_dir/js/ contains source code for the visualization
• root_serve_dir/css/ contains css files for visualization

Json

This file is autogenerated when you run your program

• graph.json contains the output from gographer.go (graph).

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