View Source Money.ExchangeRates.OpenExchangeRates (Money v5.17.0)

Implements the Money.ExchangeRates for the Open Exchange Rates service.

Required configuration:

The configuration key :open_exchange_rates_app_id should be set to your app_id. for example:

config :ex_money,
  open_exchange_rates_app_id: "your_app_id"

or configure it via environment variable:

config :ex_money,
  open_exchange_rates_app_id: {:system, "OPEN_EXCHANGE_RATES_APP_ID"}

It is also possible to configure an alternative base url for this service in case it changes in the future. For example:

config :ex_money,
  open_exchange_rates_app_id: "your_app_id"
  open_exchange_rates_url: "https://openexchangerates.org/alternative_api"

Summary

Functions

decode_rates(body)

Callback implementation for Money.ExchangeRates.decode_rates/1.

get_historic_rates(date, config)

Retrieves the historic exchange rates from Open Exchange Rates site.

get_latest_rates(config)

Retrieves the latest exchange rates from Open Exchange Rates site.

init(default_config)

Update the retriever configuration to include the requirements for Open Exchange Rates. This function is invoked when the exchange rate service starts up, just after the ets table :exchange_rates is created.

Functions

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decode_rates(body)

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Callback implementation for Money.ExchangeRates.decode_rates/1.

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get_historic_rates(date, config)

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Retrieves the historic exchange rates from Open Exchange Rates site.

  • date is a date returned by Date.new/3 or any struct with the elements :year, :month and :day.

  • config is the retrieval configuration. When invoked from the exchange rates services this will be the config returned from Money.ExchangeRates.config/0

Returns:

  • {:ok, rates} if the rates can be retrieved

  • {:error, reason} if rates cannot be retrieved

Typically this function is called by the exchange rates retrieval service although it can be called outside that context as required.

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get_latest_rates(config)

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@spec get_latest_rates(Money.ExchangeRates.Config.t()) ::
  {:ok, map()} | {:error, String.t()}

Retrieves the latest exchange rates from Open Exchange Rates site.

  • config is the retrieval configuration. When invoked from the exchange rates services this will be the config returned from Money.ExchangeRates.config/0

Returns:

  • {:ok, rates} if the rates can be retrieved

  • {:error, reason} if rates cannot be retrieved

Typically this function is called by the exchange rates retrieval service although it can be called outside that context as required.

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init(default_config)

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Update the retriever configuration to include the requirements for Open Exchange Rates. This function is invoked when the exchange rate service starts up, just after the ets table :exchange_rates is created.

Returns the configuration either unchanged or updated with additional configuration specific to this exchange rates retrieval module.