Beyond an exercise in personal education — there were chunks of tech in here I hadn't even heard of — this is a db to pixel gizmo which integrates
- Neo4j a graph database using Cypher query language
- NodeJS, Express
- Angular4, Material Design
- ngx-charts for the force directed graph
Still in progress, this exercise focuses more on the backend.
The database seeds with 100k records, each seed a random IP address with 3 random connections.
In the graph db, this gets UNWIND-ed (UNWOUND?) via Cypher query language.
let queryString = 'WITH {_seeds} AS seeds';
queryString += ' UNWIND seeds as seed';
queryString += ' MERGE (source:Address { address: seed.address })';
queryString += ' WITH source, seed.connections AS connections';
queryString += ' UNWIND connections AS connection';
queryString += ' MATCH (target:Address) WHERE target.address = connection';
queryString += ' MERGE (source)-[:CONNECTS_TO]->(target)';
This also proved a challenge where I missed a key bit until @InverseFalcon helped me via StackOverflow: UNWIND with child UNWIND producing wrong nodes and relationships
Despite watching a series of videos and reading the docs repeatedly I never ran across this:
The
WITHstatement creates its own, new scope.
My original version missed ' WITH **source,** seed.connections AS connections'; and had me stumped until @InverseFalcon chimed in. I had tried other versions of passing in a var to the UNWIND loop, but kept bonking.
I really wanted the UNWIND and child UNWIND all in one place rather than seeding parents then adding all the connections afterward.
- update README - part 1
- update README - part 2
- get the Swagger spec wired all proper-like
- tests, tests, tests
- improve Docker bits
- audit and update the todos
- Every 5 seconds add 10 new random nodes with connections are added.
- Every 10 seconds delete 5 random nodes and relationships.
run: node ./src/neo/neo-db-randomizer.js
node ./src/neo/neo-db-seeder.js
This project was generated with Angular CLI version 1.0.0.
Run ng serve for a dev server. Navigate to http://localhost:4200/. The app will automatically reload if you change any of the source files.
Run ng generate component component-name to generate a new component. You can also use ng generate directive/pipe/service/class/module.
Run ng build to build the project. The build artifacts will be stored in the dist/ directory. Use the -prod flag for a production build.
Run ng test to execute the unit tests via Karma.
Run ng e2e to execute the end-to-end tests via Protractor.
Before running the tests make sure you are serving the app via ng serve.
To get more help on the Angular CLI use ng help or go check out the Angular CLI README.