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(ns de.mpg.shh.util-datomic-peer.transaction
(:require [clojure.tools.logging :refer [info error]]
[clojure.string :as str]
[datomic.api :as d])
(:import [java.util.concurrent ExecutionException]
[datomic.db DbId]))
(defn wrap-tx
[tx-future]
(try
{:tx-result (deref tx-future)}
(catch ExecutionException eex
{:error (.getMessage (.getCause eex))})))
(defn transact-entity-and-resolve-id
[tx-future temp-eid]
(let [tx-result (wrap-tx tx-future)]
(if (contains? tx-result :error)
tx-result
(assoc tx-result :eid (d/resolve-tempid (:db-after (:tx-result tx-result)) (:tempids (:tx-result tx-result)) temp-eid)))))
(defn resolve-tx-map-temp-id
[id-map accumulator [k v]]
(if (and (= DbId (type v))
(contains? id-map v))
(assoc accumulator k (get id-map v))
(assoc accumulator k v)))
(defn resolve-tx-datom-temp-id
[id-map accumulator v]
(if (and (= DbId (type v))
(contains? id-map v))
(conj accumulator (get id-map v))
(conj accumulator v)))
(defn resolve-tx-temp-ids
[id-map tx]
(if (map? tx)
(reduce (partial resolve-tx-map-temp-id id-map) {} tx)
(reduce (partial resolve-tx-datom-temp-id id-map) [] tx)))
(defn resolve-id-map
[tx-result accumulator [k v]]
(if (= DbId (type v))
(let [resolved-id (d/resolve-tempid (:db-after tx-result) (:tempids tx-result) v)]
(if (nil? resolved-id)
(assoc accumulator k v)
(assoc accumulator k v
v resolved-id)))
(assoc accumulator k v)))
(defn apply-tx-with-db
"apply the transaction to the given db using with"
[accumulator item]
(let [resolved-item (vec (map (partial resolve-tx-temp-ids (:id-map accumulator)) item))
tx-result (d/with (:db accumulator) resolved-item)
resolved-id-map (reduce (partial resolve-id-map tx-result) {} (:id-map accumulator))]
(assoc accumulator :db (:db-after tx-result)
:id-map resolved-id-map)))
(defn apply-tx
"apply the transaction to the given db"
[accumulator item]
(let [resolved-item (vec (map (partial resolve-tx-temp-ids (:id-map accumulator)) item))
tx-result (.get (d/transact (:conn accumulator) resolved-item))
resolved-id-map (reduce (partial resolve-id-map tx-result) {} (:id-map accumulator))]
(assoc accumulator :db (:db-after tx-result)
:id-map resolved-id-map)))