System Architecture

note: in the actual implementation, both go and rails service share the same redis cluster, however, they don't share any keys

Services

• rails_service:
  • mySQL: well, a database
  • rails: a restful rails api that servers GET/PUT requests
  • sneakers: a worker that consumes messages from rabbitMQ of records waiting to be persisted
  • elasticsearch: and index to the Messages table
  • redis: two hashes populated with the counters that needs to be persisted
  • whenever(scheduled crons): a job that runs every 1 minute to persist the counters into the db and reset them in the cache
• go_service:
  • mux: an api for creating resources
  • redis: hashes to serve resources numbers
  • rabbitMQ publishers: publish messages for resources waiting to be processed and persisted
• reverse_proxy: an nginx server that acts as a router to the two services above

How to Run

Run docker-compose up -d

Ports for all services are forwarded to host for testing purposes, you can comment them and only keep the one for nginx service

Run docker-compose rails_service exec rspec to run the tests

Endpoints

• Create Application

# request:

curl --location --request POST 'http://localhost:80/api/applications' \
--header 'Content-Type: application/json' \
--data-raw '{
    "application_name": <APP_NAME>
}'

# response:

{
    "type": "application",
    "application_token": "2a3bbac-456e-4rf6-...",
    "application_name": "myname"
}      

• Create Chat

# request:

curl --location --request POST 'http://localhost:80/api/applications/<APP_TOKEN>/chats' \
--header 'Content-Type: application/json' \
--data-raw '{
    "chat_name": <CHAT_NAME>
}'

# response:

{
    "type": "chat",
    "application_token": "2a7b3bbd-45e2-4eff-...",
    "chat_number": 2,
    "chat_name": "mychatname"
}

• Create Message

# request:

curl --location --request POST 'http://localhost:80/api/applications/<APP_TOKEN>/chats/<CHAT_NUMBER>' \
--header 'Content-Type: application/json' \
--data-raw '{
    "application_name": <APP_NAME>
}'

# response:

{
    "type": "message",
    "application_token": "2a7b3bbd-45e2-4eff-b7cd-...",
    "chat_number": 1,
    "message_number": 1,
    "message_content": "hello world!"
}

• Search Chat Messages

# request:

curl --location --request GET 'http://localhost:80/api/applications/<APP_TOKEN>/chats/<CHAT_NUMBER>/search' \
--header 'Content-Type: application/json' \
--data-raw '{
    "search_query" : <SEARCH_QUERY>
}'

# response:

[
    {
        "number": 1,
        "content": "hello world!"
    },
    ...
]

• Supported endpoints:

# applications
GET   /api/applications                      
GET   /api/applications/:token
PATCH /api/applications/:token
PUT   /api/applications/:token

# chats
GET   /api/applications/:app_token/chats        
GET   /api/applications/:app_token/chats/:number
PATCH /api/applications/:app_token/chats/:number
PUT   /api/applications/:app_token/chats/:number
GET   /api/applications/:app_token/chats/:chat_number/search

# messages
GET   /api/applications/:app_token/chats/:chat_number/messages
GET   /api/applications/:app_token/chats/:chat_number/messages/:number
PATCH /api/applications/:app_token/chats/:chat_number/messages/:number
PUT   /api/applications/:app_token/chats/:chat_number/messages/:number