1 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
3 ;;; Free Software published under an MIT-like license. See LICENSE ;;;
5 ;;; Copyright (c) 2012 Google, Inc. All rights reserved. ;;;
7 ;;; Original author: Scott McKay ;;;
9 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
11 (in-package "PROTO-IMPL")
14 ;;; Protocol buffer defining macros
16 ;; Define a schema named 'type', corresponding to a .proto file of that name
17 (defmacro define-schema (type (&key name syntax package lisp-package import optimize
18 options documentation)
19 &body messages &environment env)
20 "Define a schema named 'type', corresponding to a .proto file of that name.
21 'name' can be used to override the defaultly generated Protobufs name.
22 'syntax' and 'package' are as they would be in a .proto file.
23 'lisp-package' can be used to specify a Lisp package if it is different from
24 the Protobufs package given by 'package'.
25 'import' is a list of pathname strings to be imported.
26 'optimize' can be either :space (the default) or :speed; if it is :speed, the
27 serialization code will be much faster, but much less compact.
28 'options' is a property list, i.e., (\"key1\" \"val1\" \"key2\" \"val2\" ...).
30 The body consists of 'define-enum', 'define-message' or 'define-service' forms."
31 (let* ((name (or name (class-name->proto type)))
32 (package (and package (if (stringp package) package (string-downcase (string package)))))
33 (lisp-pkg (and lisp-package (if (stringp lisp-package) lisp-package (string lisp-package))))
34 (options (remove-options
35 (loop for (key val) on options by #'cddr
36 collect (make-instance 'protobuf-option
37 :name (if (symbolp key) (slot-name->proto key) key)
39 "optimize_for" "lisp_package"))
40 (imports (if (listp import) import (list import)))
41 (schema (make-instance 'protobuf-schema
44 :syntax (or syntax "proto2")
46 :lisp-package (or lisp-pkg (substitute #\- #\_ package))
49 (append options (list (make-instance 'protobuf-option
51 :value (if (eq optimize :speed) "SPEED" "CODE_SIZE")
54 :documentation documentation))
56 (*protobuf-package* (or (find-proto-package lisp-pkg) *package*)))
57 (apply #'process-imports schema imports)
58 (with-collectors ((forms collect-form))
59 (dolist (msg messages)
60 (assert (and (listp msg)
61 (member (car msg) '(define-enum define-message define-extend define-service))) ()
62 "The body of ~S must be one of ~{~S~^ or ~}"
63 'define-schema '(define-enum define-message define-extend define-service))
64 ;; The macro-expander will return a form that consists
65 ;; of 'progn' followed by a symbol naming what we've expanded
66 ;; (define-enum, define-message, define-extend, define-service),
67 ;; followed by the Lisp model object created by the defining form,
68 ;; followed by other defining forms (e.g., deftype, defclass)
69 (destructuring-bind (&optional progn model-type model definers)
70 (macroexpand-1 msg env)
71 (assert (eq progn 'progn) ()
72 "The macroexpansion for ~S failed" msg)
73 (map () #'collect-form definers)
76 (setf (proto-enums schema) (nconc (proto-enums schema) (list model))))
77 ((define-message define-extend)
78 (setf (proto-parent model) schema)
79 (setf (proto-messages schema) (nconc (proto-messages schema) (list model)))
80 (when (eq (proto-message-type model) :extends)
81 (setf (proto-extenders schema) (nconc (proto-extenders schema) (list model)))))
83 (setf (proto-services schema) (nconc (proto-services schema) (list model)))))))
84 (let ((var (intern (format nil "*~A*" type) *protobuf-package*)))
88 (let* ((old-schema ,var)
91 (multiple-value-bind (upgradable warnings)
92 (schema-upgradable old-schema new-schema)
94 (protobufs-warn "The old schema for ~S (~A) can't be safely upgraded; proceeding anyway"
96 (map () #'protobufs-warn warnings))))
97 (setq ,var new-schema)
98 (record-protobuf ,var)
99 ,@(with-collectors ((messages collect-message))
100 (labels ((collect-messages (message)
101 (collect-message message)
102 (map () #'collect-messages (proto-messages message))))
103 (map () #'collect-messages (proto-messages schema)))
105 (mapcar #'(lambda (m) `(record-protobuf ,m)) messages)
106 (when (eq optimize :speed)
107 (append (mapcar #'generate-object-size messages)
108 (mapcar #'generate-serializer messages)
109 (mapcar #'generate-deserializer messages)))))
112 ;; Define an enum type named 'type' and a Lisp 'deftype'
113 (defmacro define-enum (type (&key name conc-name alias-for options documentation)
115 "Define a Protobufs enum type and a Lisp 'deftype' named 'type'.
116 'name' can be used to override the defaultly generated Protobufs enum name.
117 'conc-name' will be used as the prefix to the Lisp enum names, if it's supplied.
118 If 'alias-for' is given, no Lisp 'deftype' will be defined. Instead, the enum
119 will be used as an alias for an enum type that already exists in Lisp.
120 'options' is a set of keyword/value pairs, both of which are strings.
122 The body consists of the enum values in the form 'name' or (name index)."
123 (let* ((name (or name (class-name->proto type)))
124 (options (loop for (key val) on options by #'cddr
125 collect (make-instance 'protobuf-option
126 :name (if (symbolp key) (slot-name->proto key) key)
128 (conc-name (and conc-name (string conc-name)))
130 (enum (make-instance 'protobuf-enum
135 :documentation documentation)))
136 (with-collectors ((vals collect-val)
137 (forms collect-form))
139 (let* ((idx (if (listp val) (second val) (incf index)))
140 (name (if (listp val) (first val) val))
141 (val-name (kintern (if conc-name (format nil "~A~A" conc-name name) (symbol-name name))))
142 (enum-name (if conc-name (format nil "~A~A" conc-name name) (symbol-name name)))
143 (enum-val (make-instance 'protobuf-enum-value
144 :name (enum-name->proto enum-name)
147 (collect-val val-name)
148 (setf (proto-values enum) (nconc (proto-values enum) (list enum-val)))))
150 ;; If we've got an alias, define a a type that is the subtype of
151 ;; the Lisp enum so that typep and subtypep work
152 (unless (eq type alias-for)
153 (collect-form `(deftype ,type () ',alias-for)))
154 ;; If no alias, define the Lisp enum type now
155 (collect-form `(deftype ,type () '(member ,@vals))))
161 ;; Define a message named 'name' and a Lisp 'defclass'
162 (defmacro define-message (type (&key name conc-name alias-for options documentation)
163 &body fields &environment env)
164 "Define a message named 'type' and a Lisp 'defclass'.
165 'name' can be used to override the defaultly generated Protobufs message name.
166 The body consists of fields, or 'define-enum' or 'define-message' forms.
167 'conc-name' will be used as the prefix to the Lisp slot accessors, if it's supplied.
168 If 'alias-for' is given, no Lisp class is defined. Instead, the message will be
169 used as an alias for a class that already exists in Lisp. This feature is intended
170 to be used to define messages that will be serialized from existing Lisp classes;
171 unless you get the slot names or readers exactly right for each field, it will be
172 the case that trying to (de)serialize into a Lisp object won't work.
173 'options' is a set of keyword/value pairs, both of which are strings.
175 Fields take the form (slot &key type name default reader)
176 'slot' can be either a symbol giving the field name, or a list whose
177 first element is the slot name and whose second element is the index.
178 'type' is the type of the slot.
179 'name' can be used to override the defaultly generated Protobufs field name.
180 'default' is the default value for the slot.
181 'reader' is a Lisp slot reader function to use to get the value, instead of
182 using 'slot-value'; this is often used when aliasing an existing class.
183 'writer' is a Lisp slot writer function to use to set the value."
184 (let* ((name (or name (class-name->proto type)))
185 (options (loop for (key val) on options by #'cddr
186 collect (make-instance 'protobuf-option
187 :name (if (symbolp key) (slot-name->proto key) key)
189 (conc-name (and conc-name (string conc-name)))
190 (message (make-instance 'protobuf-message
196 :options (remove-options options "default" "packed")
197 :documentation documentation))
199 (*protobuf* message))
200 (with-collectors ((slots collect-slot)
201 (forms collect-form))
202 (dolist (field fields)
204 ((define-enum define-message define-extend define-extension define-group)
205 (destructuring-bind (&optional progn model-type model definers extra-field extra-slot)
206 (macroexpand-1 field env)
207 (assert (eq progn 'progn) ()
208 "The macroexpansion for ~S failed" field)
209 (map () #'collect-form definers)
212 (setf (proto-enums message) (nconc (proto-enums message) (list model))))
213 ((define-message define-extend)
214 (setf (proto-parent model) message)
215 (setf (proto-messages message) (nconc (proto-messages message) (list model)))
216 (when (eq (proto-message-type model) :extends)
217 (setf (proto-extenders message) (nconc (proto-extenders message) (list model)))))
219 (setf (proto-parent model) message)
220 (setf (proto-messages message) (nconc (proto-messages message) (list model)))
222 (collect-slot extra-slot))
223 (setf (proto-fields message) (nconc (proto-fields message) (list extra-field))))
225 (setf (proto-extensions message) (nconc (proto-extensions message) (list model)))))))
227 (multiple-value-bind (field slot idx)
228 (process-field field index :conc-name conc-name :alias-for alias-for)
229 (assert (not (find-field message (proto-index field))) ()
230 "The field ~S overlaps with another field in ~S"
231 (proto-value field) (proto-class message))
235 (setf (proto-fields message) (nconc (proto-fields message) (list field)))))))
237 ;; If we've got an alias, define a a type that is the subtype of
238 ;; the Lisp class that typep and subtypep work
239 (unless (or (eq type alias-for) (find-class type nil))
240 (collect-form `(deftype ,type () ',alias-for)))
241 ;; If no alias, define the class now
242 (collect-form `(defclass ,type () (,@slots)
243 ,@(and documentation `((:documentation ,documentation))))))
249 (defmacro define-extension (from to)
250 "Define an extension range within a message.
251 The \"body\" is the start and end of the range, both inclusive."
254 ,(make-instance 'protobuf-extension
256 :to (if (eq to 'max) #.(1- (ash 1 29)) to))
259 (defmacro define-extend (type (&key name conc-name options documentation)
260 &body fields &environment env)
261 "Define an extension to the message named 'type'.
262 'name' can be used to override the defaultly generated Protobufs message name.
263 The body consists only of fields.
264 'options' is a set of keyword/value pairs, both of which are strings.
266 Fields take the form (slot &key type name default reader)
267 'slot' can be either a symbol giving the field name, or a list whose
268 first element is the slot name and whose second element is the index.
269 'type' is the type of the slot.
270 'name' can be used to override the defaultly generated Protobufs field name.
271 'default' is the default value for the slot.
272 'reader' is a Lisp slot reader function to use to get the value, instead of
273 using 'slot-value'; this is often used when aliasing an existing class.
274 'writer' is a Lisp slot writer function to use to set the value."
275 (let* ((name (or name (class-name->proto type)))
276 (options (loop for (key val) on options by #'cddr
277 collect (make-instance 'protobuf-option
278 :name (if (symbolp key) (slot-name->proto key) key)
280 (message (find-message *protobuf* name))
281 (conc-name (or (and conc-name (string conc-name))
282 (and message (proto-conc-name message))))
283 (alias-for (and message (proto-alias-for message)))
284 (extends (and message
285 (make-instance 'protobuf-message
288 :parent (proto-parent message)
291 :enums (copy-list (proto-enums message))
292 :messages (copy-list (proto-messages message))
293 :fields (copy-list (proto-fields message))
294 :options (remove-options
295 (or options (copy-list (proto-options message))) "default" "packed")
296 :extensions (copy-list (proto-extensions message))
297 :message-type :extends ;this message is an extension
298 :documentation documentation)))
302 "There is no message named ~A to extend" name)
303 (assert (eq type (proto-class message)) ()
304 "The type ~S doesn't match the type of the message being extended ~S"
306 (with-collectors ((forms collect-form))
307 (dolist (field fields)
308 (assert (not (member (car field)
309 '(define-enum define-message define-extend define-extension))) ()
310 "The body of ~S can only contain field and group definitions" 'define-extend)
313 (destructuring-bind (&optional progn model-type model definers extra-field extra-slot)
314 (macroexpand-1 field env)
315 (assert (eq progn 'progn) ()
316 "The macroexpansion for ~S failed" field)
317 (map () #'collect-form definers)
320 (setf (proto-parent model) extends)
321 (setf (proto-messages extends) (nconc (proto-messages extends) (list model)))
323 ;;--- Refactor to get rid of all this duplicated code!
324 (let* ((inits (cdr extra-slot))
325 (sname (car extra-slot))
326 (stable (fintern "~A-VALUES" sname))
327 (stype (getf inits :type))
328 (reader (or (getf inits :accessor)
330 (intern (if conc-name (format nil "~A~A" conc-name sname) (symbol-name sname))
331 *protobuf-package*)))
332 (writer (or (getf inits :writer)
333 (intern (format nil "~A-~A" 'set reader) *protobuf-package*)))
334 (default (getf inits :initform)))
335 (collect-form `(without-redefinition-warnings ()
336 (let ((,stable #+ccl (make-hash-table :test #'eq :weak t)
337 #+sbcl (make-hash-table :test #'eq :weakness :value)))
338 ,@(and reader `((defmethod ,reader ((object ,type))
339 (gethash object ,stable ,default))))
340 ,@(and writer `((defmethod ,writer ((object ,type) value)
341 (declare (type ,stype value))
342 (setf (gethash object ,stable) value))))
343 ,@(and writer `((defsetf ,reader ,writer)))
344 ;; For Python compatibility
345 (defmethod get-extension ((object ,type) (slot (eql ',sname)))
346 (values (gethash object ,stable ,default)))
347 (defmethod set-extension ((object ,type) (slot (eql ',sname)) value)
348 (setf (gethash object ,stable) value))
349 (defmethod has-extension ((object ,type) (slot (eql ',sname)))
350 (multiple-value-bind (value foundp)
351 (gethash object ,stable)
352 (declare (ignore value))
354 (defmethod clear-extension ((object ,type) (slot (eql ',sname)))
355 (remhash object ,stable)))))))
356 (setf (proto-message-type extra-field) :extends) ;this field is an extension
357 (setf (proto-fields extends) (nconc (proto-fields extends) (list extra-field)))
358 (setf (proto-extended-fields extends) (nconc (proto-extended-fields extends) (list extra-field)))))))
360 (multiple-value-bind (field slot idx)
361 (process-field field index :conc-name conc-name :alias-for alias-for)
362 (assert (not (find-field extends (proto-index field))) ()
363 "The field ~S overlaps with another field in ~S"
364 (proto-value field) (proto-class extends))
365 (assert (index-within-extensions-p idx message) ()
366 "The index ~D is not in range for extending ~S"
367 idx (proto-class message))
370 (let* ((inits (cdr slot))
372 (stable (fintern "~A-VALUES" sname))
373 (stype (getf inits :type))
374 (reader (or (getf inits :accessor)
376 (intern (if conc-name (format nil "~A~A" conc-name sname) (symbol-name sname))
377 *protobuf-package*)))
378 (writer (or (getf inits :writer)
379 (intern (format nil "~A-~A" 'set reader) *protobuf-package*)))
380 (default (getf inits :initform)))
381 ;; For the extended slots, each slot gets its own table
382 ;; keyed by the object, which lets us avoid having a slot in each
383 ;; instance that holds a table keyed by the slot name
384 ;; Multiple 'define-extends' on the same class in the same image
385 ;; will result in harmless redefinitions, so squelch the warnings
386 ;;--- Maybe these methods need to be defined in 'define-message'?
387 (collect-form `(without-redefinition-warnings ()
388 (let ((,stable #+ccl (make-hash-table :test #'eq :weak t)
389 #+sbcl (make-hash-table :test #'eq :weakness :value)))
390 ,@(and reader `((defmethod ,reader ((object ,type))
391 (gethash object ,stable ,default))))
392 ,@(and writer `((defmethod ,writer ((object ,type) value)
393 (declare (type ,stype value))
394 (setf (gethash object ,stable) value))))
395 ,@(and writer `((defsetf ,reader ,writer)))
396 ;; For Python compatibility
397 (defmethod get-extension ((object ,type) (slot (eql ',sname)))
398 (values (gethash object ,stable ,default)))
399 (defmethod set-extension ((object ,type) (slot (eql ',sname)) value)
400 (setf (gethash object ,stable) value))
401 (defmethod has-extension ((object ,type) (slot (eql ',sname)))
402 (multiple-value-bind (value foundp)
403 (gethash object ,stable)
404 (declare (ignore value))
406 (defmethod clear-extension ((object ,type) (slot (eql ',sname)))
407 (remhash object ,stable)))))
408 ;; This so that (de)serialization works
409 (setf (proto-reader field) reader
410 (proto-writer field) writer)))
411 (setf (proto-message-type field) :extends) ;this field is an extension
412 (setf (proto-fields extends) (nconc (proto-fields extends) (list field)))
413 (setf (proto-extended-fields extends) (nconc (proto-extended-fields extends) (list field)))))))
419 (defun index-within-extensions-p (index message)
420 (let ((extensions (proto-extensions message)))
421 (some #'(lambda (ext)
422 (and (i>= index (proto-extension-from ext))
423 (i<= index (proto-extension-to ext))))
426 (defmacro define-group (type (&key index arity name conc-name alias-for reader options documentation)
427 &body fields &environment env)
428 "Define a message named 'type' and a Lisp 'defclass', *and* a field named type.
429 This is deprecated in Protobufs, but if you have to use it, you must give
430 'index' as the field index and 'arity' of :required, :optional or :repeated.
431 'name' can be used to override the defaultly generated Protobufs message name.
432 The body consists of fields, or 'define-enum' or 'define-message' forms.
433 'conc-name' will be used as the prefix to the Lisp slot accessors, if it's supplied.
434 If 'alias-for' is given, no Lisp class is defined. Instead, the message will be
435 used as an alias for a class that already exists in Lisp. This feature is intended
436 to be used to define messages that will be serialized from existing Lisp classes;
437 unless you get the slot names or readers exactly right for each field, it will be
438 the case that trying to (de)serialize into a Lisp object won't work.
439 'options' is a set of keyword/value pairs, both of which are strings.
441 Fields take the form (slot &key type name default reader)
442 'slot' can be either a symbol giving the field name, or a list whose
443 first element is the slot name and whose second element is the index.
444 'type' is the type of the slot.
445 'name' can be used to override the defaultly generated Protobufs field name.
446 'default' is the default value for the slot.
447 'reader' is a Lisp slot reader function to use to get the value, instead of
448 using 'slot-value'; this is often used when aliasing an existing class.
449 'writer' is a Lisp slot writer function to use to set the value."
450 (check-type index integer)
451 (check-type arity (member :required :optional :repeated))
452 (let* ((slot (or type (and name (proto->slot-name name *protobuf-package*))))
453 (name (or name (class-name->proto type)))
454 (options (loop for (key val) on options by #'cddr
455 collect (make-instance 'protobuf-option
456 :name (if (symbolp key) (slot-name->proto key) key)
458 (conc-name (and conc-name (string conc-name)))
460 (let ((msg-conc (proto-conc-name *protobuf*)))
462 (intern (format nil "~A~A" msg-conc slot) *protobuf-package*)))))
463 (mslot (unless alias-for
464 `(,slot ,@(case arity
468 `(:type (or ,type null)
471 `(:type (list-of ,type)
474 `(:accessor ,reader))
475 :initarg ,(kintern (symbol-name slot)))))
476 (mfield (make-instance 'protobuf-field
477 :name (slot-name->proto slot)
484 :message-type :group))
485 (message (make-instance 'protobuf-message
490 :options (remove-options options "default" "packed")
491 :message-type :group ;this message is a group
492 :documentation documentation))
494 (*protobuf* message))
495 (with-collectors ((slots collect-slot)
496 (forms collect-form))
497 (dolist (field fields)
499 ((define-enum define-message define-extend define-extension define-group)
500 (destructuring-bind (&optional progn model-type model definers extra-field extra-slot)
501 (macroexpand-1 field env)
502 (assert (eq progn 'progn) ()
503 "The macroexpansion for ~S failed" field)
504 (map () #'collect-form definers)
507 (setf (proto-enums message) (nconc (proto-enums message) (list model))))
508 ((define-message define-extend)
509 (setf (proto-parent model) message)
510 (setf (proto-messages message) (nconc (proto-messages message) (list model)))
511 (when (eq (proto-message-type model) :extends)
512 (setf (proto-extenders message) (nconc (proto-extenders message) (list model)))))
514 (setf (proto-parent model) message)
515 (setf (proto-messages message) (nconc (proto-messages message) (list model)))
517 (collect-slot extra-slot))
518 (setf (proto-fields message) (nconc (proto-fields message) (list extra-field))))
520 (setf (proto-extensions message) (nconc (proto-extensions message) (list model)))))))
522 (multiple-value-bind (field slot idx)
523 (process-field field index :conc-name conc-name :alias-for alias-for)
524 (assert (not (find-field message (proto-index field))) ()
525 "The field ~S overlaps with another field in ~S"
526 (proto-value field) (proto-class message))
530 (setf (proto-fields message) (nconc (proto-fields message) (list field)))))))
532 ;; If we've got an alias, define a a type that is the subtype of
533 ;; the Lisp class that typep and subtypep work
534 (unless (or (eq type alias-for) (find-class type nil))
535 (collect-form `(deftype ,type () ',alias-for)))
536 ;; If no alias, define the class now
537 (collect-form `(defclass ,type () (,@slots)
538 ,@(and documentation `((:documentation ,documentation))))))
546 (defun process-field (field index &key conc-name alias-for)
547 "Process one field descriptor within 'define-message' or 'define-extend'.
548 Returns a 'proto-field' object, a CLOS slot form and the incremented field index."
549 (when (i= index 18999) ;skip over the restricted range
551 (destructuring-bind (slot &rest other-options
552 &key type reader writer name (default nil default-p) packed
553 options documentation &allow-other-keys) field
554 (let* ((idx (if (listp slot) (second slot) (iincf index)))
555 (slot (if (listp slot) (first slot) slot))
558 (intern (format nil "~A~A" conc-name slot) *protobuf-package*))))
560 (loop for (key val) on other-options by #'cddr
561 unless (member key '(:type :reader :writer :name :default :packed :documentation))
562 collect (make-instance 'protobuf-option
563 :name (slot-name->proto key)
565 (loop for (key val) on options by #'cddr
566 collect (make-instance 'protobuf-option
567 :name (if (symbolp key) (slot-name->proto key) key)
569 (multiple-value-bind (ptype pclass)
570 (clos-type-to-protobuf-type type)
571 (multiple-value-bind (reqd vectorp)
572 (clos-type-to-protobuf-required type)
573 (let* ((default (if (eq reqd :repeated)
574 (if vectorp $empty-vector $empty-list) ;to distinguish between list-of and vector-of
575 (if default-p default $empty-default)))
576 (cslot (unless alias-for
581 `(:accessor ,reader)))
584 :initarg ,(kintern (symbol-name slot))
585 ,@(cond ((eq reqd :repeated)
586 ;; Repeated fields get a container for their elements
588 `(:initform (make-array 5 :fill-pointer 0 :adjustable t))
590 ((and (not default-p)
592 ;; Use unbound for booleans only
593 (not (eq pclass :bool)))
596 `(:initform ,(protobuf-default-to-clos-init default type)))))))
597 (field (make-instance 'protobuf-field
598 :name (or name (slot-name->proto slot))
601 ;; One of :required, :optional or :repeated
608 ;; Pack the field only if requested and it actually makes sense
609 :packed (and (eq reqd :repeated) packed t)
611 :documentation documentation)))
612 (values field cslot idx)))))))
614 ;; Define a service named 'type' with generic functions declared for
615 ;; each of the methods within the service
616 (defmacro define-service (type (&key name options documentation)
618 "Define a service named 'type' and Lisp 'defgeneric' for all its methods.
619 'name' can be used to override the defaultly generated Protobufs service name.
620 'options' is a set of keyword/value pairs, both of which are strings.
622 The body is a set of method specs of the form (name (input-type output-type) &key options).
623 'input-type' and 'output-type' may also be of the form (type &key name)."
624 (let* ((name (or name (class-name->proto type)))
625 (options (loop for (key val) on options by #'cddr
626 collect (make-instance 'protobuf-option
627 :name (if (symbolp key) (slot-name->proto key) key)
629 (service (make-instance 'protobuf-service
633 :documentation documentation))
635 (with-collectors ((forms collect-form))
636 (dolist (method method-specs)
637 (destructuring-bind (function (input-type output-type) &key name options documentation) method
638 (let* ((input-name (and (listp input-type)
639 (getf (cdr input-type) :name)))
640 (input-type (if (listp input-type) (car input-type) input-type))
641 (output-name (and (listp output-type)
642 (getf (cdr output-type) :name)))
643 (output-type (if (listp output-type) (car output-type) output-type))
644 (options (loop for (key val) on options by #'cddr
645 collect (make-instance 'protobuf-option
646 :name (if (symbolp key) (slot-name->proto key) key)
648 (package *protobuf-package*)
650 (server-fn (intern (format nil "~A-~A" 'do function) package))
651 (method (make-instance 'protobuf-method
653 :name (or name (class-name->proto function))
654 :client-stub client-fn
655 :server-stub server-fn
656 :input-type input-type
657 :input-name (or input-name (class-name->proto input-type))
658 :output-type output-type
659 :output-name (or output-name (class-name->proto output-type))
662 :documentation documentation)))
663 (setf (proto-methods service) (nconc (proto-methods service) (list method)))
664 ;; The following are the hooks to CL-Stubby
665 (let* ((vinput (intern (format nil "~A-~A" (symbol-name input-type) 'in) package))
666 (voutput (intern (format nil "~A-~A" (symbol-name output-type) 'out) package))
667 (vchannel (intern (symbol-name 'channel) package))
668 (vcallback (intern (symbol-name 'callback) package)))
669 ;; The client side stub, e.g., 'read-air-reservation'.
670 ;; The expectation is that CL-Stubby will provide macrology to make it
671 ;; easy to implement a method for this on each kind of channel (HTTP, TCP socket,
672 ;; IPC, etc). Unlike C++/Java/Python, we don't need a client-side subclass,
673 ;; because we can just use multi-methods.
674 ;; The CL-Stubby macros take care of serializing the input, transmitting the
675 ;; request over the wire, waiting for input (or not if it's asynchronous),
676 ;; filling in the output, and calling the callback (if it's asynchronous).
677 ;; It's not very Lispy to side-effect an output object, but it makes
678 ;; asynchronous calls simpler.
679 (collect-form `(defgeneric ,client-fn (,vchannel ,vinput ,voutput &key ,vcallback)
680 ,@(and documentation `((:documentation ,documentation)))
681 #-sbcl (declare (values ,output-type))))
682 ;; The server side stub, e.g., 'do-read-air-reservation'.
683 ;; The expectation is that the server-side program will implement
684 ;; a method with the business logic for this on each kind of channel
685 ;; (HTTP, TCP socket, IPC, etc), possibly on a server-side subclass
686 ;; of the input class
687 ;; The business logic is expected to perform the correct operations on
688 ;; the input object, which arrived via Protobufs, and produce an output
689 ;; of the given type, which will be serialized as a result.
690 ;; The channel objects hold client identity information, deadline info,
691 ;; etc, and can be side-effected to indicate success or failure
692 ;; CL-Stubby provides the channel classes and does (de)serialization, etc
693 (collect-form `(defgeneric ,server-fn (,vchannel ,vinput ,voutput)
694 ,@(and documentation `((:documentation ,documentation)))
695 #-sbcl (declare (values ,output-type))))))))
702 ;;; Ensure everything in a Protobufs schema is defined
704 (defvar *undefined-messages*)
706 ;; A very useful tool during development...
707 (defun ensure-all-schemas ()
710 (loop for p being the hash-values of *all-schemas*
712 #'string< :key #'proto-name)))
713 (mapcan #'ensure-schema protos)))
715 (defgeneric ensure-schema (schema)
717 "Ensure that all of the types are defined in the Protobufs schema 'schema'.
718 This returns two values:
719 - A list whose elements are (<undefined-type> \"message:field\" ...)
720 - The accumulated warnings table that has the same information as objects.")
721 (:method ((schema protobuf-schema))
722 (let ((*undefined-messages* (make-hash-table))
723 (trace (list schema)))
724 (map () (curry #'ensure-message trace) (proto-messages schema))
725 (map () (curry #'ensure-service trace) (proto-services schema))
726 (loop for type being the hash-keys of *undefined-messages*
727 using (hash-value things)
729 (mapcar #'(lambda (thing)
730 (format nil "~A:~A" (proto-name (car thing)) (proto-name (cdr thing))))
731 things)) into warnings
732 finally (return (values warnings *undefined-messages*))))))
734 (defgeneric ensure-message (trace message)
735 (:method (trace (message protobuf-message))
736 (let ((trace (cons message trace)))
737 (map () (curry #'ensure-message trace) (proto-messages message))
738 (map () (curry #'ensure-field trace message) (proto-fields message)))))
740 (defgeneric ensure-field (trace message field)
741 (:method (trace message (field protobuf-field))
742 (ensure-type trace message field (proto-class field))))
744 (defgeneric ensure-service (trace service)
745 (:method (trace (service protobuf-service))
746 (map () (curry #'ensure-method trace service) (proto-methods service))))
748 (defgeneric ensure-method (trace service method)
749 (:method (trace service (method protobuf-method))
750 (ensure-type trace service method (proto-input-type method))
751 (ensure-type trace service method (proto-output-type method))))
753 ;; 'message' and 'field' can be a message and a field or a service and a method
754 (defun ensure-type (trace message field type)
755 (unless (keywordp type)
756 (let ((msg (loop for p in trace
757 thereis (or (find-message p type)
758 (find-enum p type)))))
760 (push (cons message field) (gethash type *undefined-messages*))))))