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https://github.com/cod1ng-earth/event-web-store


https://github.com/cod1ng-earth/event-web-store

elm elm-lang event-sourcing event-store eventstore go golang kafka

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README 

        
# event driven web shop



aka Event Thingy Store



## setup in docker



``` bash

make setup

```



## setup on host



Terminal 1



``` bash

cd shared

make run

```



Terminal 2



``` bash

cd backend

make import

make run

```



Terminal 3



``` bash

cd frontend

make run

```



## Required tools for development



- golang

- air https://github.com/cosmtrek/air

- elm

- elm-live

- protoc

- protoc-gen-elm https://www.npmjs.com/package/protoc-gen-elm

- docker



## Features



- automatic rebuild backend

- automatic rebuild frontend

- wait free reads

- removed rw lock

- load all data before starting to serve requests



## Rules



- keep read short

- all state exists as persisted event / kafka is the only source of truth

- avoid (syncronous) network calls

- minimize overhead in data flow, data access, code structure



## Roadmap



sync frontend



- websocket

- localstorage

- tab open



backend



- extract simba

  - [DONE] lock: exclusive, sharedread, waitfree

  - [SKIP] serialize: json, protobuf

  - [DONE] configure: massage wrapper

  - [DONE] processing: batch & finalize vs single-step

  - batch only during start vs dynamic selection

  - [DONE] sync to other contexts before processing commands

- extend simba to create bridges

  - share events between contexts

- CORS

  - configurable api domain in frontend

  - configurable spa domain in backend

  - http handler wrapper for CORS setup

- production docker image

- limit cpu and memory use locally

- remove .uuid

- [DONE] use context specific data structs

- [DONE] generalize context

- tests for handlers * cqrs & context

- [DONE] context with swapable model & read-write lock

- liveness probe / readiness probe

  - check kafka

  - remember last connection and let that be the test

  - the processor needs to signal, that it is stuck (msg unknown)

- /metrics endpoint for prometheus

  - add model size, writes, writetime, readtime, reads, handler calls to metrics

  - hook into sarama metrics to expose

- add timeouts & retries & exponential backoff & shedding & circuitbreaking & avoid thundering heard

- ensure ordered cart is exactly the cart shown in the browser

- better startup

  - snapshots

  - add a confirmation email

  - when triggering an sideeffect, then ensure to do this only once

  - after dirty shutdown wait for ip ttl

- use https://godoc.org/github.com/golang-collections/go-datastructures/slice/skip#SkipList.ByPosition

- debug

  - tracing via jaeger

  - debugger local

  - debug prod system

  - cpu & memory profiler

  - browser events in kafka

  - copy prod events to local



frontend



- production image

- remove .uuid

- use int32 everywhere https://package.elm-lang.org/packages/eriktim/elm-protocol-buffers/latest/#known-limitations

- use less & cleanup css classes from html elm

- [DONE] use protobuf / remove json

- [DONE] use modules

- use urls & links

- only process results matching the current model

- configure backend url

- tests

- add timeouts & retries & exponential backoff & shedding & circuitbreaking & avoid thundering heard



general



- create an uneasy environment https://github.com/Netflix/SimianArmy/tree/master/src/main/resources/scripts

- e2e tests

- add pim

- add fulfilment

- add cms

- add search



## Maybe later (stick to basics and prove of concept first)



- tilt



## Failed ideas



- use arc cache to skip marshal from struct to json