taoensso.nippy — com.taoensso/nippy 2.15.0-alpha6

High-performance serialization library for Clojure

*auto-freeze-compressor* clj

(fn [byte-array])->compressor used by `(freeze <x> {:compressor :auto}), nil => default

*custom-readers* clj

{<hash-or-byte-id> (fn [data-input])}

*final-freeze-fallback* clj

DEPRECATED

*freeze-fallback* clj

(fn [data-output x]), nil => default

-cache-proxy clj

{[<x> <meta>] <idx>} for freezing, {<idx> <x-with-meta>} for thawing.

aes128-encryptor clj

Default 128bit AES encryptor with many-round SHA-512 key-gen.

Password form [:salted "my-password"]

USE CASE: You want more than a small, finite number of passwords (e.g. each item encrypted will use a unique user-provided password).

IMPLEMENTATION: Uses a relatively cheap key hash, but automatically salts every key.

PROS: Each key is independent so would need to be attacked independently. CONS: Key caching impossible, so there's an inherent trade-off between encryption/decryption speed and the difficulty of attacking any particular key.

Slower than aes128-cached, and easier to attack any particular key - but keys are independent.

Password form [:cached "my-password"]

USE CASE: You want only a small, finite number of passwords (e.g. a limited number of staff/admins, or you'll be using a single password to encrypt many items).

IMPLEMENTATION: Uses a very expensive (but cached) key hash, and no salt.

PROS: Great amortized encryption/decryption speed. Expensive key hash makes attacking any particular key very difficult. CONS: Using a small number of keys for many encrypted items means that if any key is somehow compromised, all items encrypted with that key are compromised.

Faster than aes128-salted, and harder to attack any particular key - but increased danger if a key is somehow compromised.

cache clj

(cache x)

Experimental, subject to change.

Wraps value so that future writes of the same wrapped value with same metadata will be efficiently encoded as references to this one.

(freeze [(cache "foo") (cache "foo") (cache "foo")]) will incl. a single "foo", plus 2x single-byte references to "foo".

compress clj

(compress compressor ba)

decompress clj

(decompress compressor ba)

decrypt clj

(decrypt encryptor pwd ba)

encrypt clj

(encrypt encryptor pwd ba)

extend-freeze clj macro

(extend-freeze type custom-type-id [x out] & body)

Extends Nippy to support freezing of a custom type (ideally concrete) with given id of form:

• Keyword - 2 byte overhead, resistent to id collisions
• Integer ∈[1, 128] - no overhead, subject to id collisions

NB: be careful about extending to interfaces, Ref. http://goo.gl/6gGRlU.

(defrecord MyRec [data]) (extend-freeze MyRec :foo/my-type [x data-output] ; Keyword id (.writeUTF [data-output] (:data x))) ;; or (extend-freeze MyRec 1 [x data-output] ; Byte id (.writeUTF [data-output] (:data x)))

extend-thaw clj macro

(extend-thaw custom-type-id [in] & body)

Extends Nippy to support thawing of a custom type with given id: (extend-thaw :foo/my-type [data-input] ; Keyword id (MyRec. (.readUTF data-input))) ;; or (extend-thaw 1 [data-input] ; Byte id (MyRec. (.readUTF data-input)))

fast-freeze clj

(fast-freeze x)

Like freeze but:

• Writes data without a Nippy header
• Drops all support for compression and encryption
• Must be thawed with fast-thaw

Equivalent to (but a little faster than): `(freeze x {:compressor nil :encryptor nil :no-header? true})

fast-thaw clj

(fast-thaw ba)

Like thaw but:

• Drops all support for compression and encryption
• Supports only data frozen with fast-freeze

Equivalent to (but a little faster than): `(thaw x {:compressor nil :encryptor nil :no-header? true})

freezable? clj

(freezable? x)

(freezable? x {:keys [allow-clojure-reader? allow-java-serializable?]})

Alpha - subject to change. Returns truthy iff Nippy appears to support freezing the given argument.

:allow-clojure-reader? and :allow-java-serializable? options may be used to enable the relevant roundtrip fallback test(s). These tests are only moderately reliable since they're cached by arg type and don't test for pre/post serialization value equality (there's no good general way of doing so).

freeze clj

(freeze x)

(freeze x
        {:keys [compressor encryptor password]
         :or {compressor :auto encryptor aes128-encryptor}
         :as opts})

Serializes arg (any Clojure data type) to a byte array. To freeze custom types, extend the Clojure reader or see extend-freeze.

freeze-fallback-as-str clj

DEPRECATED

freeze-to-file clj

(freeze-to-file file x)

(freeze-to-file file x freeze-opts)

Convenience util: writes (freeze x freeze-opts) byte array to (clojure.java.io/file file) and returns the byte array.

(freeze-to-file "my-filename.npy" my-val) => Serialized byte array

freeze-to-out! clj

(freeze-to-out! data-output x)

Serializes arg (any Clojure data type) to a DataOutput. This is a low-level util: in most cases you'll want freeze instead.

IFreezable1 clj protocol

-freeze-without-meta! clj

(-freeze-without-meta! x data-output)

IFreezable2 clj protocol

-freeze-with-meta! clj

(-freeze-with-meta! x data-output)

inspect-ba clj

(inspect-ba ba)

(inspect-ba ba thaw-opts)

Alpha - subject to change

lz4-compressor clj

Default net.jpountz.lz4 compressor: Ratio: low. Write speed: very high. Read speed: very high.

A good general-purpose compressor, competitive with Snappy.

Thanks to Max Penet (@mpenet) for our first implementation, Ref. https://github.com/mpenet/nippy-lz4

lz4hc-compressor clj

Like lz4-compressor but trades some write speed for ratio.

lzma2-compressor clj

Default org.tukaani.xz.LZMA2 compressor: Ratio: high. Write speed: very slow (also currently single-threaded). Read speed: slow.

A specialized compressor for large, low-write data in space-sensitive environments.

set-auto-freeze-compressor! clj

(set-auto-freeze-compressor! x)

set-freeze-fallback! clj

(set-freeze-fallback! x)

snappy-compressor clj

Default org.iq80.snappy.Snappy compressor: Ratio: low. Write speed: very high. Read speed: very high.

A good general-purpose compressor.

stress-data clj

Reference data used for tests & benchmarks

stress-data-benchable clj

Reference data with stuff removed that breaks reader or other utils we'll be benching against

stress-data-comparable clj

Reference data with stuff removed that breaks roundtrip equality

swap-custom-readers! clj

(swap-custom-readers! f)

thaw clj

(thaw ba)

(thaw ba
      {:keys [v1-compatibility? compressor encryptor password]
       :or {compressor :auto encryptor :auto}
       :as opts})

Deserializes a frozen Nippy byte array to its original Clojure data type. To thaw custom types, extend the Clojure reader or see extend-thaw.

** By default, supports data frozen with Nippy v2+ ONLY ** Add {:v1-compatibility? true} option to support thawing of data frozen with legacy versions of Nippy.

Options include: :v1-compatibility? - support data frozen by legacy versions of Nippy? :compressor - :auto (checks header, default) an ICompressor, or nil :encryptor - :auto (checks header, default), an IEncryptor, or nil

thaw-from-file clj

(thaw-from-file file)

(thaw-from-file file thaw-opts)

Convenience util: returns (thaw ba thaw-opts) Clojure value for the byte array read from (clojure.java.io/file file).

(thaw-from-file "my-filename.npy") => Deserialized Clojure value

To thaw from a resource on classpath (e.g in Leiningen resources dir): (thaw-from-file (clojure.java.io/resource "my-resource-name.npy"))

thaw-from-in! clj

(thaw-from-in! data-input)

Deserializes a frozen object from given DataInput to its original Clojure data type.

This is a low-level util: in most cases you'll want thaw instead.

throw-unfreezable clj

(throw-unfreezable x)

try-write-readable clj

(try-write-readable out x)

try-write-serializable clj

(try-write-serializable out x)

write-id clj macro

(write-id out id)

write-unfreezable clj

(write-unfreezable out x)