proxycon#

Overview#

proxycon is a performant Golang proxy service that returns the bitcoin historical data as fast as possible. This proxy service is used by a machine learning blackbox to do bitcoin trading. It is mission critical.

As for now it uses only Go stdlib and may be improved with external libraries.

Datasource#

The data is available at https://europe-west1-bitstack-test.cloudfunctions.net/coding-challenge-v2

The data format is a JSON payload, with the price and timestamp in RFC3339 format.

curl -fsS https://europe-west1-bitstack-test.cloudfunctions.net/coding-challenge-v2 | jq .

{
  "data": [
    {
      "price": "8773698",
      "timestamp": "2021-11-19T12:22:51Z"
    },
    {
      "price": "6920238",
      "timestamp": "2021-11-19T12:26:11Z"
    },
    {
      "price": "5218360",
      "timestamp": "2021-11-19T12:29:31Z"
    }
  ]
}

API#

GET /list endpoint to get min and max prices with pagination

{
  "start": "timestamp",
  "end": "timestamp",
  "max": "2108300",
  "min": "2108300",
  "data": [
    {
    "amount": "2108300",
    "timestamp": "timestamp",
    },
    ...
  ],
}

GET /price?at=<timestamp> endpoint to get a price at the given timestamp

{
  "data": [
    {
      "amount": "2108300",
      "timestamp": "timestamp"
    }
  ]
}

GET /average?start=<timestamp>&end=<timestamp> endpoint that computes the average price over a certain arbitrary period

{
  "start": "timestamp",
  "end": "timestamp",
  "avg": "2108300",
  "data": [
    {
    "amount": "2108300",
    "timestamp": "timestamp",
    },
    ...
  ],
}

GET /prices SSE endpoint to push price updates

CLI#

proxycon --port 8080 --verbose --page 10

proxycon args

port: define the HTTP listening port (TCP/8080 default)
verbose: manage slog verbosity (INFO default)
page: page size for listing endpoint (10 default)

Build#

go build -ldflags="-s -w -X main.version=$(git describe --tags --always) -X main.buildTime=$(date -u +%Y-%m-%dT%H:%M:%SZ)" -trimpath -o bin/proxycon .

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