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remote.cljc
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remote.cljc
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(ns datahike.remote
"Literals that can function as lightweight remote pointers to connections and
dbs."
(:require [cognitect.transit :as transit]
[jsonista.core :as j]
[jsonista.tagged :as jt]
[clojure.edn :as edn]
[datahike.json :refer [json-base-handlers]]
[datahike.datom :as dd])
#?(:clj
(:import [clojure.lang IDeref]
[datahike.datom Datom]
[com.fasterxml.jackson.core JsonGenerator])))
;; https://github.com/thi-ng/color/issues/10
;; fixes lein repl / Cloure 1.10.0
(prefer-method print-method java.util.Map clojure.lang.IDeref)
;; fixes lein repl / Clojure 1.10.1
(prefer-method print-method clojure.lang.IPersistentMap clojure.lang.IDeref)
;; fixes CIDER / Clojure 1.9.0 / 1.10.0 / 1.10.1
(prefer-method clojure.pprint/simple-dispatch clojure.lang.IPersistentMap clojure.lang.IDeref)
;; Remote peer currently operated on. This is used to allow the tagged literal
;; readers to attach the remote again.
(def ^:dynamic *remote-peer* nil)
(defmulti remote-deref (fn [{:keys [remote-peer]}] (:backend remote-peer)))
(defprotocol PRemotePeer
(-remote-peer [_] "Retrieve remote peer."))
(extend-protocol PRemotePeer
Object
(-remote-peer [_] nil))
(defn remote-peer [obj] (-remote-peer obj))
(defrecord RemoteConnection [store-id remote-peer]
#?@(:clj
[IDeref
(deref [conn] (remote-deref conn))
PRemotePeer
(-remote-peer [_] remote-peer)]))
(defn remote-connection [store-id]
(RemoteConnection. store-id *remote-peer*))
#?(:clj
(defmethod print-method RemoteConnection
[^RemoteConnection conn ^java.io.Writer w]
(.write w "#datahike/RemoteConnection")
(.write w (pr-str (:store-id conn)))))
(defrecord RemoteDB [store-id max-tx max-eid commit-id remote-peer]
PRemotePeer
(-remote-peer [_] remote-peer))
(defn remote-db [m]
(assoc (map->RemoteDB m) :remote-peer *remote-peer*))
#?(:clj
(defmethod print-method RemoteDB
[^RemoteDB db ^java.io.Writer w]
(.write w "#datahike/RemoteDB")
(.write w (pr-str (into {} (dissoc db :remote-peer))))))
(defrecord RemoteHistoricalDB [origin remote-peer]
PRemotePeer
(-remote-peer [_] remote-peer))
(defn remote-historical-db [m]
(assoc (map->RemoteHistoricalDB m) :remote-peer *remote-peer*))
#?(:clj
(defmethod print-method RemoteHistoricalDB
[^RemoteDB db ^java.io.Writer w]
(.write w "#datahike/RemoteHistoricalDB")
(.write w (pr-str (into {} (dissoc db :remote-peer))))))
(defrecord RemoteSinceDB [origin time-point remote-peer]
PRemotePeer
(-remote-peer [_] remote-peer))
(defn remote-since-db [m]
(assoc (map->RemoteSinceDB m) :remote-peer *remote-peer*))
#?(:clj
(defmethod print-method RemoteSinceDB
[^RemoteDB db ^java.io.Writer w]
(.write w "#datahike/RemoteSinceDB")
(.write w (pr-str (into {} (dissoc db :remote-peer))))))
(defrecord RemoteAsOfDB [origin time-point remote-peer]
PRemotePeer
(-remote-peer [_] remote-peer))
(defn remote-as-of-db [m]
(assoc (map->RemoteAsOfDB m) :remote-peer *remote-peer*))
#?(:clj
(defmethod print-method RemoteAsOfDB
[^RemoteDB db ^java.io.Writer w]
(.write w "#datahike/RemoteAsOfDB")
(.write w (pr-str (into {} (dissoc db :remote-peer))))))
(defrecord RemoteEntity [db eid remote-peer]
PRemotePeer
(-remote-peer [_] remote-peer))
(defn remote-entity [m]
(assoc (map->RemoteEntity m) :remote-peer *remote-peer*))
#?(:clj
(defmethod print-method RemoteEntity
[^RemoteEntity e ^java.io.Writer w]
(.write w "#datahike/RemoteEntity")
(.write w (pr-str (dissoc (into {} e) :remote-peer)))))
(defn edn-replace-remote-literals [s]
(reduce (fn [^String s [^String from ^String to]]
(.replace s from to))
s
[["#datahike/RemoteConnection" "#datahike/Connection"]
["#datahike/RemoteDB" "#datahike/DB"]
["#datahike/RemoteHistoricalDB" "#datahike/HistoricalDB"]
["#datahike/RemoteSinceDB" "#datahike/SinceDB"]
["#datahike/RemoteAsOfDB" "#datahike/AsOfDB"]]))
(def edn-readers {'datahike/Connection remote-connection
'datahike/DB remote-db
'datahike/HistoricalDB remote-historical-db
'datahike/AsOfDB remote-as-of-db
'datahike/SinceDB remote-since-db
'datahike/Datom datahike.datom/datom-from-reader
'datahike.db.TxReport datahike.db/map->TxReport})
(defn map-without-remote [r]
(dissoc (into {} r) :remote-peer))
(defn datom-as-vec [^Datom d]
[(.-e d) (.-a d) (.-v d) (dd/datom-tx d) (dd/datom-added d)])
(defn datom-from-vec [v] (apply dd/datom v))
(def transit-write-handlers {datahike.remote.RemoteConnection (transit/write-handler "datahike/Connection" #(:store-id %))
datahike.datom.Datom (transit/write-handler "datahike/Datom" datom-as-vec)
datahike.remote.RemoteDB (transit/write-handler "datahike/DB" map-without-remote)
datahike.remote.RemoteHistoricalDB (transit/write-handler "datahike/HistoricalDB" map-without-remote)
datahike.remote.RemoteSinceDB (transit/write-handler "datahike/SinceDB" map-without-remote)
datahike.remote.RemoteAsOfDB (transit/write-handler "datahike/AsOfDB" map-without-remote)
datahike.remote.RemoteEntity (transit/write-handler "datahike/Entity" #(into {} %))})
(def transit-read-handlers {"datahike/Connection" (transit/read-handler remote-connection)
"datahike/Datom" (transit/read-handler datom-from-vec)
"datahike/TxReport" (transit/read-handler datahike.db/map->TxReport)
"datahike/DB" (transit/read-handler remote-db)
"datahike/HistoricalDB" (transit/read-handler remote-historical-db)
"datahike/SinceDB" (transit/read-handler remote-since-db)
"datahike/AsOfDB" (transit/read-handler remote-as-of-db)
"datahike/Entity" (transit/read-handler remote-entity)})
(declare json-mapper)
(defn write-to-generator [f]
(fn [x ^JsonGenerator gen]
(let [json-out (j/write-value-as-string (f x) json-mapper)]
(.writeRawValue gen json-out))))
(def json-mapper-opts
{:encode-key-fn true
:decode-key-fn true
:modules [(jt/module
{:handlers
(merge
json-base-handlers
{datahike.remote.RemoteConnection
{:tag "!datahike/Connection"
:encode (write-to-generator :store-id)
:decode remote-connection}
datahike.datom.Datom
{:tag "!datahike/Datom"
:encode (write-to-generator datom-as-vec)
:decode datom-from-vec}
datahike.db.TxReport
{:tag "!datahike/TxReport"
:encode (write-to-generator #(into {} %))
:decode datahike.db/map->TxReport}
datahike.remote.RemoteDB
{:tag "!datahike/DB"
:encode (write-to-generator map-without-remote)
:decode remote-db}
datahike.remote.RemoteHistoricalDB
{:tag "!datahike/HistoricalDB"
:encode (write-to-generator map-without-remote)
:decode remote-historical-db}
datahike.remote.RemoteSinceDB
{:tag "!datahike/SinceDB"
:encode (write-to-generator map-without-remote)
:decode remote-since-db}
datahike.remote.RemoteAsOfDB
{:tag "!datahike/AsOfDB"
:encode (write-to-generator map-without-remote)
:decode remote-as-of-db}
datahike.remote.RemoteEntity
{:tag "!datahike/Entity"
:encode (write-to-generator #(into {} %))
:decode remote-entity}})})]})
(def json-mapper (j/object-mapper json-mapper-opts))