Transformers

Custom Transformers

There are two functions in the iboga.core namespace that allow you to register a function to be used as a transformer to and from the value IB receives/requires in their Java api: def-to-ib and def-from-ib. Each takes a fully qualified symbol representing a spec key, and a function of a single value which transforms that value (either to the value type IB expects, or from the IB value to a more clojury type.).

Transformers can be defined for any "leaf" field in a request or received message (for example :iboga.recv.historical-data/bar or iboga.contract-details/liquid-hours).

Examples

;;Use 
(ib/def-from-ib :iboga.bar/time
  (fn [v]
    (-> (if (= (count v) 8) ;;breaks in year 10000
          (-> v (LocalDate/parse impl/ib-datetime-formatter) .atStartOfDay)
          (-> v (LocalDateTime/parse impl/ib-datetime-formatter)))
        (ZonedDateTime/of (ZoneId/systemDefault)
        .toInstant)))

(ib/def-from-ib :iboga.contract-details/market-rule-ids 
  (fn [v] (.split v ",")))

(ib/def-from-ib :iboga.contract-details/time-zone-id
  (fn [x] (ZoneId/of x)))