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lmdb.clj
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lmdb.clj
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(ns crux.kv.lmdb
"LMDB KV backend for Crux."
(:require [clojure.java.io :as io]
[clojure.tools.logging :as log]
[clojure.spec.alpha :as s]
[crux.io :as cio]
[crux.kv :as kv]
[crux.memory :as mem]
[crux.lru :as lru])
(:import clojure.lang.ExceptionInfo
java.io.Closeable
[org.agrona DirectBuffer MutableDirectBuffer ExpandableDirectByteBuffer]
org.agrona.concurrent.UnsafeBuffer
[org.lwjgl.system MemoryStack MemoryUtil]
[org.lwjgl.util.lmdb LMDB MDBEnvInfo MDBStat MDBVal]))
(set! *unchecked-math* :warn-on-boxed)
;; Based on
;; https://github.com/LWJGL/lwjgl3/blob/master/modules/samples/src/test/java/org/lwjgl/demo/util/lmdb/LMDBDemo.java
(defn- success? [rc]
(when-not (= LMDB/MDB_SUCCESS rc)
(throw (ex-info (LMDB/mdb_strerror rc) {:error rc}))))
(defn- env-set-mapsize [^long env ^long size]
(success? (LMDB/mdb_env_set_mapsize env size)))
;; TODO: Note, this has to be done when there are no open
;; transactions. Also, when file reached 4Gb it crashed. MDB_WRITEMAP
;; and MDB_MAPASYNC might solve this, but doesn't allow nested
;; transactions. See: https://github.com/dw/py-lmdb/issues/113
(defn- increase-mapsize [env ^long factor]
(with-open [stack (MemoryStack/stackPush)]
(let [info (MDBEnvInfo/mallocStack stack)]
(success? (LMDB/mdb_env_info env info))
(let [new-mapsize (* factor (.me_mapsize info))]
(log/debug "Increasing mapsize to:" new-mapsize)
(env-set-mapsize env new-mapsize)))))
(defrecord LMDBTransaction [^long txn]
Closeable
(close [_]
(let [rc (LMDB/mdb_txn_commit txn)]
(when-not (= LMDB/MDB_BAD_TXN rc)
(success? rc)))))
(defn- new-transaction ^crux.kv.lmdb.LMDBTransaction [env flags]
(with-open [stack (MemoryStack/stackPush)]
(let [pp (.mallocPointer stack 1)
rc (LMDB/mdb_txn_begin env MemoryUtil/NULL flags pp)]
(if (= LMDB/MDB_MAP_RESIZED rc)
(env-set-mapsize env 0)
(success? rc))
(->LMDBTransaction (.get pp)))))
(defn- env-create []
(with-open [stack (MemoryStack/stackPush)]
(let [pp (.mallocPointer stack 1)]
(success? (LMDB/mdb_env_create pp))
(.get pp))))
(defn- env-open [^long env dir ^long flags]
(success? (LMDB/mdb_env_open env
(.getAbsolutePath (doto (io/file dir)
(.mkdirs)))
flags
0664)))
(defn- env-close [^long env]
(LMDB/mdb_env_close env))
(defn- env-copy [^long env path]
(let [file (io/file path)]
(when (.exists file)
(throw (IllegalArgumentException. (str "Directory exists: " (.getAbsolutePath file)))))
(.mkdirs file)
(success? (LMDB/mdb_env_copy env (.getAbsolutePath file)))))
(defn- dbi-open [env]
(with-open [stack (MemoryStack/stackPush)
tx (new-transaction env LMDB/MDB_RDONLY)]
(let [{:keys [^long txn]} tx
ip (.mallocInt stack 1)
^CharSequence name nil]
(success? (LMDB/mdb_dbi_open txn name 0 ip))
(.get ip 0))))
(defrecord LMDBCursor [^long cursor]
Closeable
(close [_]
(LMDB/mdb_cursor_close cursor)))
(defn- new-cursor ^crux.kv.lmdb.LMDBCursor [dbi txn]
(with-open [stack (MemoryStack/stackPush)]
(let [pp (.mallocPointer stack 1)]
(success? (LMDB/mdb_cursor_open txn dbi pp))
(->LMDBCursor (.get pp)))))
(defn- cursor->key [cursor ^MDBVal kv ^MDBVal dv flags]
(let [rc (LMDB/mdb_cursor_get cursor kv dv flags)]
(when (not= LMDB/MDB_NOTFOUND rc)
(success? rc)
(UnsafeBuffer. (.mv_data kv) 0 (.mv_size kv)))))
(defn- cursor-put [env dbi kvs]
(with-open [stack (MemoryStack/stackPush)
tx (new-transaction env 0)
cursor (new-cursor dbi (:txn tx))]
(let [{:keys [cursor]} cursor
kv (MDBVal/mallocStack stack)
dv (MDBVal/mallocStack stack)
kb (ExpandableDirectByteBuffer.)
vb (ExpandableDirectByteBuffer.)]
(doseq [[k v] kvs]
(let [k (mem/ensure-off-heap k kb)
v (mem/ensure-off-heap v vb)
kv (-> kv
(.mv_data (MemoryUtil/memByteBuffer (.addressOffset k) (.capacity k)))
(.mv_size (.capacity k)))
dv (.mv_size dv (.capacity v))]
(success? (LMDB/mdb_cursor_put cursor kv dv LMDB/MDB_RESERVE))
(.getBytes v 0 (.mv_data dv) (.mv_size dv)))))))
;; TODO: Figure out why LMDB crashes if we remove the sort here. The
;; root cause is likely something else.
(defn- tx-delete [env dbi ks]
(with-open [stack (MemoryStack/stackPush)
tx (new-transaction env 0)]
(let [{:keys [^long txn]} tx
kv (MDBVal/mallocStack stack)
kb (ExpandableDirectByteBuffer.)]
(doseq [k ks]
(let [k (mem/ensure-off-heap k kb)
kv (-> kv
(.mv_data (MemoryUtil/memByteBuffer (.addressOffset k) (.capacity k)))
(.mv_size (.capacity k)))
rc (LMDB/mdb_del txn dbi kv nil)]
(when-not (= LMDB/MDB_NOTFOUND rc)
(success? rc)))))))
(defn- tx-get [dbi ^LMDBTransaction tx k]
(with-open [stack (MemoryStack/stackPush)]
(let [k (mem/->off-heap k)
kv (-> (MDBVal/mallocStack stack)
(.mv_data (MemoryUtil/memByteBuffer (.addressOffset k) (.capacity k)))
(.mv_size (.capacity k)))
dv (MDBVal/mallocStack stack)
rc (LMDB/mdb_get (.txn tx) dbi kv dv)]
(when-not (= LMDB/MDB_NOTFOUND rc)
(success? rc)
(UnsafeBuffer. (.mv_data dv) 0 (.mv_size dv))))))
(def ^:const default-env-flags (bit-or LMDB/MDB_NOTLS
LMDB/MDB_NORDAHEAD))
(def ^:const no-sync-env-flags (bit-or LMDB/MDB_MAPASYNC
LMDB/MDB_NOSYNC
LMDB/MDB_NOMETASYNC))
(defrecord LMDBKvIterator [^LMDBCursor cursor ^LMDBTransaction tx ^MDBVal kv ^MDBVal dv ^ExpandableDirectByteBuffer eb]
kv/KvIterator
(seek [_ k]
(let [k (mem/ensure-off-heap k eb)
kv (-> kv
(.mv_data (MemoryUtil/memByteBuffer (.addressOffset k) (.capacity k)))
(.mv_size (.capacity k)))]
(cursor->key (.cursor cursor) kv dv LMDB/MDB_SET_RANGE)))
(next [this]
(cursor->key (.cursor cursor) kv dv LMDB/MDB_NEXT))
(prev [this]
(cursor->key (.cursor cursor) kv dv LMDB/MDB_PREV))
(value [this]
(UnsafeBuffer. (.mv_data dv) 0 (.mv_size dv)))
Closeable
(close [_]
(.close cursor)))
(defrecord LMDBKvSnapshot [env dbi ^LMDBTransaction tx]
kv/KvSnapshot
(new-iterator [_]
(->LMDBKvIterator (new-cursor dbi (.txn tx))
tx
(MDBVal/create)
(MDBVal/create)
(ExpandableDirectByteBuffer.)))
(get-value [_ k]
(tx-get dbi tx k))
Closeable
(close [_]
(.close tx)))
(def ^:dynamic ^{:tag 'long} *mapsize-increase-factor* 1)
(def ^:const max-mapsize-increase-factor 32)
(defrecord LMDBKv [db-dir env env-flags dbi]
kv/KvStore
(open [this {:keys [crux.kv/db-dir crux.kv/sync? crux.kv.lmdb/env-flags] :as options}]
(let [env-flags (or env-flags
(bit-or default-env-flags
(if sync?
0
no-sync-env-flags)))
env (env-create)]
(try
(env-open env db-dir env-flags)
(assoc this
:db-dir db-dir
:env env
:env-flags env-flags
:dbi (dbi-open env))
(catch Throwable t
(env-close env)
(throw t)))))
(new-snapshot [_]
(let [tx (new-transaction env LMDB/MDB_RDONLY)]
(->LMDBKvSnapshot env dbi tx)))
(store [this kvs]
(try
(cursor-put env dbi kvs)
(catch ExceptionInfo e
(if (= LMDB/MDB_MAP_FULL (:error (ex-data e)))
(binding [*mapsize-increase-factor* (* 2 *mapsize-increase-factor*)]
(when (> *mapsize-increase-factor* max-mapsize-increase-factor)
(throw (IllegalStateException. "Too large size of key values to store at once.")))
(increase-mapsize env *mapsize-increase-factor*)
(kv/store this kvs))
(throw e)))))
(delete [this ks]
(try
(tx-delete env dbi ks)
(catch ExceptionInfo e
(if (= LMDB/MDB_MAP_FULL (:error (ex-data e)))
(binding [*mapsize-increase-factor* (* 2 *mapsize-increase-factor*)]
(when (> *mapsize-increase-factor* max-mapsize-increase-factor)
(throw (IllegalStateException. "Too large size of keys to delete at once.")))
(increase-mapsize env *mapsize-increase-factor*)
(kv/delete this ks))
(throw e)))))
(fsync [this]
(success? (LMDB/mdb_env_sync env true)))
(backup [_ dir]
(env-copy env dir))
(count-keys [_]
(with-open [stack (MemoryStack/stackPush)
tx (new-transaction env LMDB/MDB_RDONLY)]
(let [stat (MDBStat/mallocStack stack)]
(LMDB/mdb_stat (.txn tx) dbi stat)
(.ms_entries stat))))
(db-dir [this]
(str db-dir))
(kv-name [this]
(.getName (class this)))
Closeable
(close [_]
(env-close env)))
(def kv
{:start-fn (fn [_ {:keys [crux.kv/db-dir] :as options}]
(lru/start-kv-store (map->LMDBKv {:db-dir db-dir}) options))
:args (-> lru/options
(assoc ::env-flags {:doc "LMDB Flags"
:crux.config/type :crux.config/nat-int})
(update ::kv/db-dir assoc :required? true, :default "data"))})
(def kv-store {:crux.node/kv-store kv})