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Price Updater

Price Updater is a web service used to consult and update the tokens and fiat currency used by Hermez Node.

Installation

$ git clone [email protected]:hermeznetwork/price-updater-service.git
$ cd price-updater-service/
$ go build -o priceupdater # or other name that you want

Pre-requirements

  1. It is necessary to have write access to a Hermez node database. The Price updater will update the prices and write them to the database.
  2. You need an API Key from https://exchangeratesapi.io/

Usage

  1. Configure .env file in the price-updater main folder. Below there is an example of and .env file.
HTTP_HOST="0.0.0.0"
HTTP_PORT=8037

# POSTGRES information
POSTGRES_USER="hermez"
POSTGRES_PASSWORD="yourpasswordhere"
POSTGRES_HOST="localhost"
POSTGRES_PORT=5432
POSTGRES_DATABASE="hermez"
POSTGRES_SSL_ENABLED=false
POSTGRES_MAX_ID_CONNS=10
POSTGRES_MAX_OPEN_CONNS=10

# ETHEREUM NODE URL
ETH_NETWORK="http://localhost:8545"

# ROLLUP SMART CONTRACT ADDRESS
ETH_HEZ_ROLLUP="0xA68D85dF56E733A06443306A095646317B5Fa633"
ETH_USDT_ADDRESS="0xa1A31DE489C9b977fa78c70C7f001da181e126FB"

# API KEY from https://exchangeratesapi.io/`. 
FIAT_API_KEY="ffffffffffffffffffffffffffff"
BBOLT_LOCATION="priceupdater.db"
MAIN_TIME_TO_UPDATE_PRICES=1m

POSTGRES_USER, POSTGRES_PASSWORD, POSTGRES_HOST and POSTGRES_PORT can be extracted from the Hermez node configuration file

  1. Configure provider priority. Providers are selected in order. 
./priceupdater change-priority --priority "bitfinex,coingecko,uniswap"

Price Updater provides configurations files to use Bitfinex, Coingecko and Uniswap as providers depending on the network. 3. Update provided configuration

./priceupdater update-config --provider bitfinex --configFile assets/testnet/bitfinex.json
./priceupdater update-config --provider coingecko --configFile assets/testnet/coingecko.json 
./priceupdater update-config --provider uniswap --configFile assets/testnet/uniswap.json
  1. Set up an apiKey to accept incoming requests
./priceupdater setup-apikey --apiKey "pr1c3upd4t3rw
  1. Start server
./priceupdater server

If everything went well, you should see the following output:


2021-08-16T14:41:32Z    INFO    cli/server.go:33        connection established with postgresql server
 ┌───────────────────────────────────────────────────┐ 
 │                   Fiber v2.14.0                   │ 
 │               http://127.0.0.1:8037               │ 
 │       (bound on host 0.0.0.0 and port 8037)       │ 
 │                                                   │ 
 │ Handlers ............ 12  Processes ........... 1 │ 
 │ Prefork ....... Disabled  PID ............ 120438 │ 
 └───────────────────────────────────────────────────┘