1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
3 ;;; Confidential and proprietary information of ITA Software, Inc. ;;;
5 ;;; Copyright (c) 2012 ITA Software, Inc. All rights reserved. ;;;
7 ;;; Original author: Scott McKay ;;;
9 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
11 (in-package "PROTO-IMPL")
14 ;;; Protobuf serialization from Lisp objects
16 (defconstant $wire-type-varint 0)
17 (defconstant $wire-type-64bit 1)
18 (defconstant $wire-type-string 2)
19 (defconstant $wire-type-32bit 5)
24 ;; Serialize the object using the given protobuf "schema"
25 (defun serialize-object-to-stream (object protobuf &key (stream *standard-output*) visited)
26 "Serializes the object 'object' as a protobuf object defined in the schema 'protobuf'
27 onto the stream 'stream' using the wire format.
28 'visited' is a hash table used to cache object sizes. If it is supplied, it will be
29 cleared before it is used; otherwise, a fresh table will be created.
30 The return value is the buffer containing the serialized object. If the stream is
31 nil, the buffer is not actually written to anywhere."
32 (let* ((visited (let ((v (or visited (make-hash-table))))
35 (size (object-size object protobuf :visited visited))
36 (buffer (make-array size :element-type '(unsigned-byte 8))))
37 (serialize-object object protobuf buffer 0 :visited visited)
39 (write-sequence buffer stream))
42 ;; Allow clients to add their own methods
43 ;; This is how we address the problem of cycles, e.g. -- if you have an object
44 ;; that may contain cycles, serialize the cyclic object using a "handle"
45 (defgeneric serialize-object (object protobuf buffer index &key visited)
47 "Serializes the object 'object' as a protobuf object defined in the schema 'protobuf'
48 into the byte array given by 'buffer' starting at the fixnum index 'index' using
50 'visited' is a hash table used to cache object sizes.
51 The return value is the buffer containing the serialized object."))
53 ;; 'visited' is used to cache object sizes
54 ;; If it's passed in explicitly, it is assumed to already have the sizes within it
55 ;; The default method uses meta-data from the protobuf "schema"
56 (defmethod serialize-object ((object standard-object) protobuf buffer index &key visited)
57 (check-type protobuf (or protobuf protobuf-message))
58 (check-type index fixnum)
59 (check-type buffer (simple-array (unsigned-byte 8)))
60 (let* ((class (class-of object))
61 (message (find-message-for-class protobuf class))
62 (visited (or visited (make-hash-table))))
64 "There is no Protobuf message for the class ~S" class)
65 (macrolet ((read-slot (object slot reader)
66 ;; Don't do a boundp check, we assume the object is fully populated
67 ;; Unpopulated slots should be "nullable" and should contain nil
69 (funcall ,reader ,object)
70 (slot-value ,object ,slot))))
71 (labels ((do-field (object trace field)
72 ;; We don't do cycle detection here
73 ;; If the client needs it, he can define his own 'serialize-object'
74 ;; method to clean things up first
75 (let* ((cl (if (eq (proto-class field) 'boolean) :bool (proto-class field)))
76 (slot (proto-value field))
77 (reader (proto-reader field))
79 (cond ((eq (proto-required field) :repeated)
80 (cond ((and slot (proto-packed field) (packed-type-p cl))
81 (setq index (serialize-packed (read-slot object slot reader)
82 cl field buffer index)))
83 ((and slot (keywordp cl))
85 (when (or v (eq cl :bool))
86 (setq index (serialize-prim v cl field buffer index))))
87 (read-slot object slot reader)))
88 ((typep (setq msg (and cl (loop for p in trace
89 thereis (or (find-message-for-class p cl)
90 (find-enum-for-type p cl)))))
92 (dolist (v (if slot (read-slot object slot reader) (list object)))
93 ;; To serialize an embedded message, first say that it's
94 ;; a string, then encode its size, then serialize its fields
95 (let ((tag (ilogior $wire-type-string (iash (proto-index field) 3)))
96 (len (object-size v protobuf :visited visited)))
97 (setq index (encode-uint32 tag buffer index))
98 (setq index (encode-uint32 len buffer index)))
99 (map () (curry #'do-field v (cons msg trace))
100 (proto-fields msg))))
101 ((and slot (typep msg 'protobuf-enum))
102 (map () #'(lambda (v)
104 (setq index (serialize-enum v msg field buffer index))))
105 (read-slot object slot reader)))))
107 (cond ((and slot (keywordp cl))
108 (let ((v (read-slot object slot reader)))
109 (when (or v (eq cl :bool))
110 (setq index (serialize-prim v cl field buffer index)))))
111 ((typep (setq msg (and cl (loop for p in trace
112 thereis (or (find-message-for-class p cl)
113 (find-enum-for-type p cl)))))
115 (let ((v (if slot (read-slot object slot reader) object)))
116 (let ((tag (ilogior $wire-type-string (iash (proto-index field) 3)))
117 (len (object-size v protobuf :visited visited)))
118 (setq index (encode-uint32 tag buffer index))
119 (setq index (encode-uint32 len buffer index)))
121 (map () (curry #'do-field v (cons msg trace))
122 (proto-fields msg)))))
123 ((and slot (typep msg 'protobuf-enum))
124 (let ((v (read-slot object slot reader)))
126 (setq index (serialize-enum v msg field buffer index)))))))))))
127 (declare (dynamic-extent #'do-field))
128 (map () (curry #'do-field object (list message protobuf)) (proto-fields message))))))
133 (defun deserialize-object-from-stream (class protobuf &key (stream *standard-input*))
134 "Deserializes an object of the give class 'class' as a protobuf object defined
135 in the schema 'protobuf' from the stream 'stream' using the wire format.
136 The return value is the object."
137 (let* ((size (file-length stream))
138 (buffer (make-array size :element-type '(unsigned-byte 8))))
139 (read-sequence buffer stream)
140 (deserialize-object class protobuf buffer 0)))
142 ;; Allow clients to add their own methods
143 ;; This is you might preserve object identity, e.g.
144 (defgeneric deserialize-object (class protobuf buffer index)
146 "Deserializes an object of the given class 'class' as a protobuf object defined
147 in the schema 'protobuf' from the byte array given by 'buffer' starting at
148 the fixnum index 'index' using the wire format.
149 The return value is the object."))
151 ;; The default method uses meta-data from the protobuf "schema"
152 ;; Note that 'class' is the Lisp name of the Protobufs message (class)
153 ;; It is not the name of any overriding class ('proto-class-override')
154 (defmethod deserialize-object ((class symbol) protobuf buffer index)
155 (check-type protobuf (or protobuf protobuf-message))
156 (check-type index fixnum)
157 (check-type buffer (simple-array (unsigned-byte 8)))
158 (let ((length (length buffer)))
159 (labels ((deserialize (class trace &optional (end length))
160 (let* ((message (loop for p in trace
161 thereis (or (find-message-for-class p class)
162 (find-enum-for-type p class))))
163 (object (make-instance (or (proto-class-override message) class))))
164 (assert (eql (proto-class message) class) ()
165 "The class in message ~S does not match the Lisp class ~S"
166 (proto-class message) class)
168 "There is no Protobuf message for the class ~S" class)
171 (return-from deserialize object))
172 (multiple-value-bind (val idx)
173 (decode-uint32 buffer index)
175 (let* ((type (logand val #x7))
176 (fld (logand (ash val -3) #x1FFFFFFF))
177 (field (find fld (proto-fields message) :key #'proto-index))
178 (cl (if (eq (proto-class field) 'boolean) :bool (proto-class field)))
179 ;; It's OK for this to be null
180 ;; That means we're parsing some version of a message
181 ;; that has the field, but our current message does not
182 ;; We still have to deserialize everything, though
183 (slot (proto-value field))
185 ;;--- Check for mismatched types, running past end of buffer, etc
186 (declare (ignore type))
187 (cond ((eq (proto-required field) :repeated)
188 (cond ((and (proto-packed field) (packed-type-p cl))
189 (multiple-value-bind (values idx)
190 (deserialize-packed cl field buffer index)
193 (setf (slot-value object slot) values))))
195 (multiple-value-bind (val idx)
196 (deserialize-prim cl field buffer index)
199 (setf (slot-value object slot)
200 (nconc (slot-value object slot) (list val))))))
201 ((typep (setq msg (and cl (or (find-message-for-class protobuf cl)
202 (find-enum-for-type protobuf cl))))
204 (multiple-value-bind (len idx)
205 (decode-uint32 buffer index)
207 (let ((obj (deserialize cl (cons msg trace) (+ index len))))
209 (setf (slot-value object slot)
210 (nconc (slot-value object slot) (list obj)))))))
211 ((typep msg 'protobuf-enum)
212 (multiple-value-bind (val idx)
213 (deserialize-enum msg field buffer index)
216 (setf (slot-value object slot)
217 (nconc (slot-value object slot) (list val))))))))
220 (multiple-value-bind (val idx)
221 (deserialize-prim cl field buffer index)
224 (setf (slot-value object slot) val))))
225 ((typep (setq msg (and cl (or (find-message-for-class protobuf cl)
226 (find-enum-for-type protobuf cl))))
228 (multiple-value-bind (len idx)
229 (decode-uint32 buffer index)
231 (let ((obj (deserialize cl (cons msg trace) (+ index len))))
233 (setf (slot-value object slot) obj)))))
234 ((typep msg 'protobuf-enum)
235 (multiple-value-bind (val idx)
236 (deserialize-enum msg field buffer index)
239 (setf (slot-value object slot) val)))))))))))))
240 (declare (dynamic-extent #'deserialize))
241 (deserialize class (list protobuf)))))
246 ;; Allow clients to add their own methods
247 ;; This is how we address the problem of cycles, e.g. -- if you have an object
248 ;; that may contain cycles, return the size of the "handle" to the object
249 (defgeneric object-size (object protobuf &key visited)
251 "Computes the size in bytes of the object 'object' defined in the schema 'protobuf'.
252 'visited' is a hash table used to cache object sizes.
253 The return value is the size of the object in bytes."))
255 ;; 'visited' is used to cache object sizes
256 ;; The default method uses meta-data from the protobuf "schema"
257 (defmethod object-size ((object standard-object) protobuf &key visited)
258 (check-type protobuf (or protobuf protobuf-message))
259 (let ((size (and visited (gethash object visited))))
261 (return-from object-size size)))
262 (let* ((class (class-of object))
263 (message (find-message-for-class protobuf class))
266 "There is no Protobuf message for the class ~S" class)
267 (macrolet ((read-slot (object slot reader)
268 ;; Don't do a boundp check, we assume the object is fully populated
269 ;; Unpopulated slots should be "nullable" and should contain nil
271 (funcall ,reader ,object)
272 (slot-value ,object ,slot))))
273 (labels ((do-field (object trace field)
274 ;; We don't do cycle detection here
275 ;; If the client needs it, he can define his own 'object-size'
276 ;; method to clean things up first
277 (let* ((cl (if (eq (proto-class field) 'boolean) :bool (proto-class field)))
278 (slot (proto-value field))
279 (reader (proto-reader field))
281 (cond ((eq (proto-required field) :repeated)
282 (cond ((and slot (proto-packed field) (packed-type-p cl))
283 (iincf size (packed-size (read-slot object slot reader) cl field)))
284 ((and slot (keywordp cl))
285 (map () #'(lambda (v)
286 (when (or v (eq cl :bool))
287 (iincf size (prim-size v cl field))))
288 (read-slot object slot reader)))
289 ((typep (setq msg (and cl (loop for p in trace
290 thereis (or (find-message-for-class p cl)
291 (find-enum-for-type p cl)))))
293 (dolist (v (if slot (read-slot object slot reader) (list object)))
294 (let ((tag (ilogior $wire-type-string (iash (proto-index field) 3)))
295 (len (object-size v protobuf :visited visited)))
296 (iincf size (length32 tag))
297 (iincf size (length32 len)))
298 (map () (curry #'do-field v (cons msg trace))
299 (proto-fields msg))))
300 ((and slot (typep msg 'protobuf-enum))
301 (map () #'(lambda (v)
303 (iincf size (enum-size v msg field))))
304 (read-slot object slot reader)))))
306 (cond ((and slot (keywordp cl))
307 (let ((v (read-slot object slot reader)))
308 (when (or v (eq cl :bool))
309 (iincf size (prim-size v cl field)))))
310 ((typep (setq msg (and cl (loop for p in trace
311 thereis (or (find-message-for-class p cl)
312 (find-enum-for-type p cl)))))
314 (let ((v (if slot (read-slot object slot reader) object)))
316 (let ((tag (ilogior $wire-type-string (iash (proto-index field) 3)))
317 (len (object-size v protobuf :visited visited)))
318 (iincf size (length32 tag))
319 (iincf size (length32 len)))
320 (map () (curry #'do-field v (cons msg trace))
321 (proto-fields msg)))))
322 ((and slot (typep msg 'protobuf-enum))
323 (let ((v (read-slot object slot reader)))
325 (iincf size (enum-size (read-slot object slot reader) msg field)))))))))))
326 (declare (dynamic-extent #'do-field))
327 (map () (curry #'do-field object (list message protobuf)) (proto-fields message))
329 (setf (gethash object visited) size)) ;cache the size