DEV Challenge XIX: Backend Online Round - Trust network

Implementation of Online Round Task Backend | DEV Challenge XIX

Stack

1. Arangodb - Powerful Graph database with excellent Performance
2. Golang - high performance language for make API-layer between client and database with minimal delay
3. Gin Web Framework - help build API fast: router, request validation, building response.
4. Postman - Useful tool which provide UI for create API tests and next export tests as JSON to run inside docker runner

Run app

docker compose up -d

See it works:

curl -i http://127.0.0.1:8080/healthcheck

curl -i -X POST http://127.0.0.1:8080/api/people

Note: Port 8080, protocol http. no sense in ssl on local, also by common rule port 8080 is http (I assume if we need ssl specs should include for port 8443)

Run tests

docker compose run postman

Example results:

┌─────────────────────────┬─────────────────┬─────────────────┐
│                         │        executed │          failed │
├─────────────────────────┼─────────────────┼─────────────────┤
│              iterations │               2 │               0 │
├─────────────────────────┼─────────────────┼─────────────────┤
│                requests │             280 │               0 │
├─────────────────────────┼─────────────────┼─────────────────┤
│            test-scripts │             560 │               0 │
├─────────────────────────┼─────────────────┼─────────────────┤
│      prerequest-scripts │               0 │               0 │
├─────────────────────────┼─────────────────┼─────────────────┤
│              assertions │             344 │               0 │
├─────────────────────────┴─────────────────┴─────────────────┤
│ total run duration: 6.9s                                    │
├─────────────────────────────────────────────────────────────┤
│ total data received: 2.47kB (approx)                        │
├─────────────────────────────────────────────────────────────┤
│ average response time: 5ms [min: 3ms, max: 97ms, s.d.: 5ms] │
└─────────────────────────────────────────────────────────────┘

Run load testing

docker compose run siege

Note:

• load testing should be executed after postman tests (for populate database with data)
• you can see siege log at siege/log/siege.log
• load testing inside docker on same machine is not so representative. Better to use two hosts: API-server and siege-client.
• for having complex load testing (closest to real data) we need to prepare Graph with complex edges and big depth.

Siege result on my machine:

• Docker resources: 1.4 GHz Quad-Core Intel Core i5, 4 (v)CPUs, RAM 8 GB, 2 GB Swap.

Transactions:                  92998 hits
Availability:                 100.00 %
Elapsed time:                  59.98 secs
Data transferred:               5.34 MB
Response time:                  0.14 secs
Transaction rate:            1550.48 trans/sec
Throughput:                     0.09 MB/sec
Concurrency:                  220.02
Successful transactions:       86737
Failed transactions:               0
Longest transaction:            2.94
Shortest transaction:           0.00

Optional. See visualization of Graph using UI

ArangoDB WebUI Graph diagram

Note: use button in top right corner Show full graph or change Graph configue settings for see whole picture.

Optional. How to view tests.

Import collection tests/DevChallangeTrustNetwork.postman_collection.json into Postman app. Did not give collection public link because it can be associated with my personal data.