order-server

README

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This project is not maintained anymore! Please check here for alternatives. This repository is kept online for reference purposes only and can be taken offline/deleted any time.

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Order Server

This service for Element43 takes market data off the orders queue from NSQ (generated by emdr-to-nsq) and stores it for later retrieval via the API. The orders are stored as Snappy compressed JSON strings bundled by market (regionID+typeID) in a PostgreSQL instance.

Installation

Either use the prebuilt Docker images and pass the appropriate env vars (see below), or:

• Clone this repo into your gopath
• Run go get
• Run go build

Deployment Info

Builds and releases are handled by Drone.

Environment Variable	Default	Description
LOG_LEVEL	info	Threshold for logging messages to be printed
PORT	8000	Port for the API to listen on
NSQ_URL	nsqd:4150	Hostname/IP of the NSQD instance to connect to
POSTGRES_URL	postgres://order-server@localhost:5432/order-server?sslmode=disable	URL to this service's Postgres database

Todo

• Improve compression story, no gzip support so far (saves CPU time)
• Add proper caching backend (dynamic invalidation as new market data comes in)
• General code cleanup (this is my second Go project), add performance metrics collection

Endpoints

Prefix: /api/orders/v1

URL Pattern	Description
/region/:regionID/	Get all orders in a region - this can be a lot of data, think around 60MB of JSON for The Forge!
/type/:typeID/	Get all orders of a type
/region/:regionID/type/:typeID/	Get all orders of a type in a region. Similar to the market view in game

The return values share a similar schema. Truncated example output for api/orders/v1/region/10000002/type/34/:

[
    {
        "orderID": 3664144403,
        "regionID": 10000002,
        "typeID": 34,
        "generatedAt": "2017-03-18T12:28:24+00:00",
        "price": 3.35,
        "volRemaining": 102824006,
        "range": 0,
        "volEntered": 120000000,
        "minVolume": 1,
        "bid": true,
        "issueDate": "2017-03-16T09:26:33+00:00",
        "duration": 90,
        "stationID": 60001873,
        "solarSystemID": 30000165
    },
    {
        "orderID": 4647080938,
        "regionID": 10000002,
        "typeID": 34,
        "generatedAt": "2017-03-18T12:28:24+00:00",
        "price": 0.07,
        "volRemaining": 99582322,
        "range": 0,
        "volEntered": 100000000,
        "minVolume": 1,
        "bid": true,
        "issueDate": "2017-02-13T14:38:29+00:00",
        "duration": 90,
        "stationID": 60003760,
        "solarSystemID": 30000142
    }
]