;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;; ;;; ;;; Free Software published under an MIT-like license. See LICENSE ;;; ;;; ;;; ;;; Copyright (c) 2012 Google, Inc. All rights reserved. ;;; ;;; ;;; ;;; Original author: Scott McKay ;;; ;;; ;;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; (in-package "PROTO-IMPL") ;;; Protocol buffer defining macros ;; Define a schema named 'type', corresponding to a .proto file of that name (defmacro define-schema (type (&key name syntax package lisp-package import optimize options documentation) &body messages &environment env) "Define a schema named 'type', corresponding to a .proto file of that name. 'name' can be used to override the defaultly generated Protobufs name. 'syntax' and 'package' are as they would be in a .proto file. 'lisp-package' can be used to specify a Lisp package if it is different from the Protobufs package given by 'package'. 'import' is a list of pathname strings to be imported. 'optimize' can be either :space (the default) or :speed; if it is :speed, the serialization code will be much faster, but much less compact. 'options' is a property list, i.e., (\"key1\" \"val1\" \"key2\" \"val2\" ...). The body consists of 'define-enum', 'define-message' or 'define-service' forms." (let* ((name (or name (class-name->proto type))) (package (and package (if (stringp package) package (string-downcase (string package))))) (lisp-pkg (and lisp-package (if (stringp lisp-package) lisp-package (string lisp-package)))) (options (remove-options (loop for (key val) on options by #'cddr collect (make-instance 'protobuf-option :name (if (symbolp key) (slot-name->proto key) key) :value val)) "optimize_for" "lisp_package")) (imports (if (listp import) import (list import))) (schema (make-instance 'protobuf-schema :class type :name name :syntax (or syntax "proto2") :package package :lisp-package (or lisp-pkg (substitute #\- #\_ package)) :imports imports :options (if optimize (append options (list (make-instance 'protobuf-option :name "optimize_for" :value (if (eq optimize :speed) "SPEED" "CODE_SIZE") :type 'symbol))) options) :documentation documentation)) (*protobuf* schema) (*protobuf-package* (or (find-proto-package lisp-pkg) *package*))) (process-imports schema imports) (with-collectors ((forms collect-form)) (dolist (msg messages) (assert (and (listp msg) (member (car msg) '(define-enum define-message define-extend define-service define-type-alias))) () "The body of ~S must be one of ~{~S~^ or ~}" 'define-schema '(define-enum define-message define-extend define-service define-type-alias)) ;; The macro-expander will return a form that consists ;; of 'progn' followed by a symbol naming what we've expanded ;; (define-enum, define-message, define-extend, define-service), ;; followed by the Lisp model object created by the defining form, ;; followed by other defining forms (e.g., deftype, defclass) (destructuring-bind (&optional progn model-type model definers) (macroexpand-1 msg env) (assert (eq progn 'progn) () "The macroexpansion for ~S failed" msg) (map () #'collect-form definers) (ecase model-type ((define-enum) (setf (proto-enums schema) (nconc (proto-enums schema) (list model)))) ((define-type-alias) (setf (proto-type-aliases schema) (nconc (proto-type-aliases schema) (list model)))) ((define-message define-extend) (setf (proto-parent model) schema) (setf (proto-messages schema) (nconc (proto-messages schema) (list model))) (when (eq (proto-message-type model) :extends) (setf (proto-extenders schema) (nconc (proto-extenders schema) (list model))))) ((define-service) (setf (proto-services schema) (nconc (proto-services schema) (list model))))))) (let ((var (intern (format nil "*~A*" type) *protobuf-package*))) `(progn ,@forms (defvar ,var nil) (let* ((old-schema ,var) (new-schema ,schema)) (when old-schema (multiple-value-bind (upgradable warnings) (schema-upgradable old-schema new-schema) (unless upgradable (protobufs-warn "The old schema for ~S (~A) can't be safely upgraded; proceeding anyway" ',type ',name) (map () #'protobufs-warn warnings)))) (setq ,var new-schema) (record-protobuf ,var) ,@(with-collectors ((messages collect-message)) (labels ((collect-messages (message) (collect-message message) (map () #'collect-messages (proto-messages message)))) (map () #'collect-messages (proto-messages schema))) (append (mapcar #'(lambda (m) `(record-protobuf ,m)) messages) (when (eq optimize :speed) (append (mapcar #'generate-object-size messages) (mapcar #'generate-serializer messages) (mapcar #'generate-deserializer messages))))) ,var)))))) (defmacro with-proto-source-location ((type name definition-type &optional pathname start-pos end-pos) &body body) "Establish a context which causes the generated Lisp code to have source location information that points to the .proto file. 'type' is the name of the Lisp definition (a symbol). 'name' is the name of the Protobufs definition (a string). 'definition-type' is the kind of definition, e.g., 'protobuf-enum'. 'pathname', 'start-pos' and 'end-pos' give the location of the definition in the .proto file." `(progn (record-proto-source-location ',type ,name ',definition-type ,pathname ,start-pos ,end-pos) ,@body)) #+ccl (defun record-proto-source-location (type name definition-type &optional pathname start-pos end-pos) (declare (ignore name)) (when (and ccl::*record-source-file* (typep pathname '(or string pathname))) (let ((ccl::*loading-toplevel-location* (ccl::make-source-note :filename pathname :start-pos start-pos :end-pos end-pos))) (ccl:record-source-file type definition-type)))) #-(or ccl) (defun record-proto-source-location (type name definition-type &optional pathname start-pos end-pos) (declare (ignorable name type definition-type pathname start-pos end-pos))) ;; Define an enum type named 'type' and a Lisp 'deftype' (defmacro define-enum (type (&key name conc-name alias-for options documentation source-location) &body values) "Define a Protobufs enum type and a Lisp 'deftype' named 'type'. 'name' can be used to override the defaultly generated Protobufs enum name. 'conc-name' will be used as the prefix to the Lisp enum names, if it's supplied. If 'alias-for' is given, no Lisp 'deftype' will be defined. Instead, the enum will be used as an alias for an enum type that already exists in Lisp. 'options' is a set of keyword/value pairs, both of which are strings. The body consists of the enum values in the form 'name' or (name index)." (let* ((name (or name (class-name->proto type))) (options (loop for (key val) on options by #'cddr collect (make-instance 'protobuf-option :name (if (symbolp key) (slot-name->proto key) key) :value val))) (conc-name (conc-name-for-type type conc-name)) (index -1) (enum (make-instance 'protobuf-enum :class type :name name :qualified-name (make-qualified-name *protobuf* name) :parent *protobuf* :alias-for alias-for :options options :documentation documentation :source-location source-location))) (with-collectors ((vals collect-val) (forms collect-form)) (dolist (val values) ;; Allow old (name index) and new (name :index index) (let* ((idx (if (listp val) (if (eq (second val) :index) (third val) (second val)) (incf index))) (name (if (listp val) (first val) val)) (val-name (kintern (if conc-name (format nil "~A~A" conc-name name) (symbol-name name)))) (enum-name (if conc-name (format nil "~A~A" conc-name name) (symbol-name name))) (vname (enum-name->proto enum-name)) (enum-val (make-instance 'protobuf-enum-value :name vname :qualified-name (make-qualified-name enum vname) :index idx :value val-name :parent enum))) (collect-val val-name) (setf (proto-values enum) (nconc (proto-values enum) (list enum-val))))) (if alias-for ;; If we've got an alias, define a a type that is the subtype of ;; the Lisp enum so that typep and subtypep work (unless (eq type alias-for) (collect-form `(deftype ,type () ',alias-for))) ;; If no alias, define the Lisp enum type now (collect-form `(deftype ,type () '(member ,@vals)))) `(progn define-enum ,enum ((with-proto-source-location (,type ,name protobuf-enum ,@source-location) ,@forms)))))) ;; Define a message named 'name' and a Lisp 'defclass' (defmacro define-message (type (&key name conc-name alias-for options documentation source-location) &body fields &environment env) "Define a message named 'type' and a Lisp 'defclass'. 'name' can be used to override the defaultly generated Protobufs message name. The body consists of fields, or 'define-enum' or 'define-message' forms. 'conc-name' will be used as the prefix to the Lisp slot accessors, if it's supplied. If 'alias-for' is given, no Lisp class is defined. Instead, the message will be used as an alias for a class that already exists in Lisp. This feature is intended to be used to define messages that will be serialized from existing Lisp classes; unless you get the slot names or readers exactly right for each field, it will be the case that trying to (de)serialize into a Lisp object won't work. 'options' is a set of keyword/value pairs, both of which are strings. Fields take the form (slot &key type name default reader) 'slot' can be either a symbol giving the field name, or a list whose first element is the slot name and whose second element is the index. 'type' is the type of the slot. 'name' can be used to override the defaultly generated Protobufs field name. 'default' is the default value for the slot. 'reader' is a Lisp slot reader function to use to get the value, instead of using 'slot-value'; this is often used when aliasing an existing class. 'writer' is a Lisp slot writer function to use to set the value." (let* ((name (or name (class-name->proto type))) (options (loop for (key val) on options by #'cddr collect (make-instance 'protobuf-option :name (if (symbolp key) (slot-name->proto key) key) :value val))) (conc-name (conc-name-for-type type conc-name)) (message (make-instance 'protobuf-message :class type :name name :qualified-name (make-qualified-name *protobuf* name) :parent *protobuf* :alias-for alias-for :conc-name conc-name :options (remove-options options "default" "packed") :documentation documentation :source-location source-location)) (index 0) ;; Only now can we bind *protobuf* to the new message (*protobuf* message)) (with-collectors ((slots collect-slot) (forms collect-form)) (dolist (field fields) (case (car field) ((define-enum define-message define-extend define-extension define-group define-type-alias) (destructuring-bind (&optional progn model-type model definers extra-field extra-slot) (macroexpand-1 field env) (assert (eq progn 'progn) () "The macroexpansion for ~S failed" field) (map () #'collect-form definers) (ecase model-type ((define-enum) (setf (proto-enums message) (nconc (proto-enums message) (list model)))) ((define-type-alias) (setf (proto-type-aliases message) (nconc (proto-type-aliases message) (list model)))) ((define-message define-extend) (setf (proto-parent model) message) (setf (proto-messages message) (nconc (proto-messages message) (list model))) (when (eq (proto-message-type model) :extends) (setf (proto-extenders message) (nconc (proto-extenders message) (list model))))) ((define-group) (setf (proto-parent model) message) (setf (proto-messages message) (nconc (proto-messages message) (list model))) (when extra-slot (collect-slot extra-slot)) (setf (proto-fields message) (nconc (proto-fields message) (list extra-field)))) ((define-extension) (setf (proto-extensions message) (nconc (proto-extensions message) (list model))))))) (otherwise (multiple-value-bind (field slot idx) (process-field field index :conc-name conc-name :alias-for alias-for) (assert (not (find-field message (proto-index field))) () "The field ~S overlaps with another field in ~S" (proto-value field) (proto-class message)) (setq index idx) (when slot (collect-slot slot)) (setf (proto-fields message) (nconc (proto-fields message) (list field))))))) (if alias-for ;; If we've got an alias, define a a type that is the subtype of ;; the Lisp class that typep and subtypep work (unless (or (eq type alias-for) (find-class type nil)) (collect-form `(deftype ,type () ',alias-for))) ;; If no alias, define the class now (collect-form `(defclass ,type () (,@slots) ,@(and documentation `((:documentation ,documentation)))))) `(progn define-message ,message ((with-proto-source-location (,type ,name protobuf-message ,@source-location) ,@forms)))))) (defun conc-name-for-type (type conc-name) (and conc-name (typecase conc-name ((member t) (format nil "~:@(~A~)-" type)) ((or string symbol) (string-upcase (string conc-name))) (t nil)))) (defmacro define-extension (from to) "Define an extension range within a message. The \"body\" is the start and end of the range, both inclusive." (let ((to (etypecase to (integer to) (symbol (if (string-equal to "MAX") #.(1- (ash 1 29)) to))))) `(progn define-extension ,(make-instance 'protobuf-extension :from from :to (if (eq to 'max) #.(1- (ash 1 29)) to)) ()))) (defmacro define-extend (type (&key name conc-name options documentation) &body fields &environment env) "Define an extension to the message named 'type'. 'name' can be used to override the defaultly generated Protobufs message name. The body consists only of fields. 'options' is a set of keyword/value pairs, both of which are strings. Fields take the form (slot &key type name default reader) 'slot' can be either a symbol giving the field name, or a list whose first element is the slot name and whose second element is the index. 'type' is the type of the slot. 'name' can be used to override the defaultly generated Protobufs field name. 'default' is the default value for the slot. 'reader' is a Lisp slot reader function to use to get the value, instead of using 'slot-value'; this is often used when aliasing an existing class. 'writer' is a Lisp slot writer function to use to set the value." (let* ((name (or name (class-name->proto type))) (options (loop for (key val) on options by #'cddr collect (make-instance 'protobuf-option :name (if (symbolp key) (slot-name->proto key) key) :value val))) (message (find-message *protobuf* name)) (conc-name (or (conc-name-for-type type conc-name) (and message (proto-conc-name message)))) (alias-for (and message (proto-alias-for message))) (extends (and message (make-instance 'protobuf-message :class (proto-class message) :name (proto-name message) :qualified-name (proto-qualified-name message) :parent (proto-parent message) :alias-for alias-for :conc-name conc-name :enums (copy-list (proto-enums message)) :messages (copy-list (proto-messages message)) :fields (copy-list (proto-fields message)) :extensions (copy-list (proto-extensions message)) :options (remove-options (or options (copy-list (proto-options message))) "default" "packed") :message-type :extends ;this message is an extension :documentation documentation :type-aliases (copy-list (proto-type-aliases message))))) ;; Only now can we bind *protobuf* to the new extended message (*protobuf* extends) (index 0)) (assert message () "There is no message named ~A to extend" name) (assert (eq type (proto-class message)) () "The type ~S doesn't match the type of the message being extended ~S" type message) (with-collectors ((forms collect-form)) (dolist (field fields) (assert (not (member (car field) '(define-enum define-message define-extend define-extension define-type-alias))) () "The body of ~S can only contain field and group definitions" 'define-extend) (case (car field) ((define-group) (destructuring-bind (&optional progn model-type model definers extra-field extra-slot) (macroexpand-1 field env) (assert (eq progn 'progn) () "The macroexpansion for ~S failed" field) (map () #'collect-form definers) (ecase model-type ((define-group) (setf (proto-parent model) extends) (setf (proto-messages extends) (nconc (proto-messages extends) (list model))) (when extra-slot ;;--- Refactor to get rid of all this duplicated code! (let* ((inits (cdr extra-slot)) (sname (car extra-slot)) (stable (fintern "~A-VALUES" sname)) (stype (getf inits :type)) (reader (or (getf inits :accessor) (getf inits :reader) (intern (if conc-name (format nil "~A~A" conc-name sname) (symbol-name sname)) *protobuf-package*))) (writer (or (getf inits :writer) (intern (format nil "~A-~A" 'set reader) *protobuf-package*))) (default (getf inits :initform))) (collect-form `(without-redefinition-warnings () (let ((,stable #+ccl (make-hash-table :test #'eq :weak t) #+sbcl (make-hash-table :test #'eq :weakness :value))) ,@(and reader `((defmethod ,reader ((object ,type)) (gethash object ,stable ,default)))) ,@(and writer `((defmethod ,writer ((object ,type) value) (declare (type ,stype value)) (setf (gethash object ,stable) value)))) ;; For Python compatibility (defmethod get-extension ((object ,type) (slot (eql ',sname))) (values (gethash object ,stable ,default))) (defmethod set-extension ((object ,type) (slot (eql ',sname)) value) (setf (gethash object ,stable) value)) (defmethod has-extension ((object ,type) (slot (eql ',sname))) (multiple-value-bind (value foundp) (gethash object ,stable) (declare (ignore value)) foundp)) (defmethod clear-extension ((object ,type) (slot (eql ',sname))) (remhash object ,stable))) ,@(and writer ;; 'defsetf' needs to be visible at compile time `((eval-when (:compile-toplevel :load-toplevel :execute) (defsetf ,reader ,writer)))))))) (setf (proto-message-type extra-field) :extends) ;this field is an extension (setf (proto-fields extends) (nconc (proto-fields extends) (list extra-field))) (setf (proto-extended-fields extends) (nconc (proto-extended-fields extends) (list extra-field))))))) (otherwise (multiple-value-bind (field slot idx) (process-field field index :conc-name conc-name :alias-for alias-for) (assert (not (find-field extends (proto-index field))) () "The field ~S overlaps with another field in ~S" (proto-value field) (proto-class extends)) (assert (index-within-extensions-p idx message) () "The index ~D is not in range for extending ~S" idx (proto-class message)) (setq index idx) (when slot (let* ((inits (cdr slot)) (sname (car slot)) (stable (fintern "~A-VALUES" sname)) (stype (getf inits :type)) (reader (or (getf inits :accessor) (getf inits :reader) (intern (if conc-name (format nil "~A~A" conc-name sname) (symbol-name sname)) *protobuf-package*))) (writer (or (getf inits :writer) (intern (format nil "~A-~A" 'set reader) *protobuf-package*))) (default (getf inits :initform))) ;; For the extended slots, each slot gets its own table ;; keyed by the object, which lets us avoid having a slot in each ;; instance that holds a table keyed by the slot name ;; Multiple 'define-extends' on the same class in the same image ;; will result in harmless redefinitions, so squelch the warnings ;;--- Maybe these methods need to be defined in 'define-message'? (collect-form `(without-redefinition-warnings () (let ((,stable #+ccl (make-hash-table :test #'eq :weak t) #+sbcl (make-hash-table :test #'eq :weakness :value))) ,@(and reader `((defmethod ,reader ((object ,type)) (gethash object ,stable ,default)))) ,@(and writer `((defmethod ,writer ((object ,type) value) (declare (type ,stype value)) (setf (gethash object ,stable) value)))) (defmethod get-extension ((object ,type) (slot (eql ',sname))) (values (gethash object ,stable ,default))) (defmethod set-extension ((object ,type) (slot (eql ',sname)) value) (setf (gethash object ,stable) value)) (defmethod has-extension ((object ,type) (slot (eql ',sname))) (multiple-value-bind (value foundp) (gethash object ,stable) (declare (ignore value)) foundp)) (defmethod clear-extension ((object ,type) (slot (eql ',sname))) (remhash object ,stable))) ,@(and writer `((eval-when (:compile-toplevel :load-toplevel :execute) (defsetf ,reader ,writer)))))) ;; This so that (de)serialization works (setf (proto-reader field) reader (proto-writer field) writer))) (setf (proto-message-type field) :extends) ;this field is an extension (setf (proto-fields extends) (nconc (proto-fields extends) (list field))) (setf (proto-extended-fields extends) (nconc (proto-extended-fields extends) (list field))))))) `(progn define-extend ,extends ,forms)))) (defun index-within-extensions-p (index message) (let ((extensions (proto-extensions message))) (some #'(lambda (ext) (and (i>= index (proto-extension-from ext)) (i<= index (proto-extension-to ext)))) extensions))) (defmacro define-group (type (&key index arity name conc-name alias-for reader options documentation source-location) &body fields &environment env) "Define a message named 'type' and a Lisp 'defclass', *and* a field named type. This is deprecated in Protobufs, but if you have to use it, you must give 'index' as the field index and 'arity' of :required, :optional or :repeated. 'name' can be used to override the defaultly generated Protobufs message name. The body consists of fields, or 'define-enum' or 'define-message' forms. 'conc-name' will be used as the prefix to the Lisp slot accessors, if it's supplied. If 'alias-for' is given, no Lisp class is defined. Instead, the message will be used as an alias for a class that already exists in Lisp. This feature is intended to be used to define messages that will be serialized from existing Lisp classes; unless you get the slot names or readers exactly right for each field, it will be the case that trying to (de)serialize into a Lisp object won't work. 'options' is a set of keyword/value pairs, both of which are strings. Fields take the form (slot &key type name default reader) 'slot' can be either a symbol giving the field name, or a list whose first element is the slot name and whose second element is the index. 'type' is the type of the slot. 'name' can be used to override the defaultly generated Protobufs field name. 'default' is the default value for the slot. 'reader' is a Lisp slot reader function to use to get the value, instead of using 'slot-value'; this is often used when aliasing an existing class. 'writer' is a Lisp slot writer function to use to set the value." (check-type index integer) (check-type arity (member :required :optional :repeated)) (let* ((slot (or type (and name (proto->slot-name name *protobuf-package*)))) (name (or name (class-name->proto type))) (options (loop for (key val) on options by #'cddr collect (make-instance 'protobuf-option :name (if (symbolp key) (slot-name->proto key) key) :value val))) (conc-name (conc-name-for-type type conc-name)) (reader (or reader (let ((msg-conc (proto-conc-name *protobuf*))) (and msg-conc (intern (format nil "~A~A" msg-conc slot) *protobuf-package*))))) (mslot (unless alias-for `(,slot ,@(case arity (:required `(:type ,type)) (:optional `(:type (or ,type null) :initform nil)) (:repeated `(:type (list-of ,type) :initform ()))) ,@(and reader `(:accessor ,reader)) :initarg ,(kintern (symbol-name slot))))) (mfield (make-instance 'protobuf-field :name (slot-name->proto slot) :type name :class type :qualified-name (make-qualified-name *protobuf* (slot-name->proto slot)) :parent *protobuf* :required arity :index index :value slot :reader reader :message-type :group)) (message (make-instance 'protobuf-message :class type :name name :qualified-name (make-qualified-name *protobuf* name) :parent *protobuf* :alias-for alias-for :conc-name conc-name :options (remove-options options "default" "packed") :message-type :group ;this message is a group :documentation documentation :source-location source-location)) (index 0) ;; Only now can we bind *protobuf* to the (group) message (*protobuf* message)) (with-collectors ((slots collect-slot) (forms collect-form)) (dolist (field fields) (case (car field) ((define-enum define-message define-extend define-extension define-group define-type-alias) (destructuring-bind (&optional progn model-type model definers extra-field extra-slot) (macroexpand-1 field env) (assert (eq progn 'progn) () "The macroexpansion for ~S failed" field) (map () #'collect-form definers) (ecase model-type ((define-enum) (setf (proto-enums message) (nconc (proto-enums message) (list model)))) ((define-type-alias) (setf (proto-type-aliases message) (nconc (proto-type-aliases message) (list model)))) ((define-message define-extend) (setf (proto-parent model) message) (setf (proto-messages message) (nconc (proto-messages message) (list model))) (when (eq (proto-message-type model) :extends) (setf (proto-extenders message) (nconc (proto-extenders message) (list model))))) ((define-group) (setf (proto-parent model) message) (setf (proto-messages message) (nconc (proto-messages message) (list model))) (when extra-slot (collect-slot extra-slot)) (setf (proto-fields message) (nconc (proto-fields message) (list extra-field)))) ((define-extension) (setf (proto-extensions message) (nconc (proto-extensions message) (list model))))))) (otherwise (multiple-value-bind (field slot idx) (process-field field index :conc-name conc-name :alias-for alias-for) (assert (not (find-field message (proto-index field))) () "The field ~S overlaps with another field in ~S" (proto-value field) (proto-class message)) (setq index idx) (when slot (collect-slot slot)) (setf (proto-fields message) (nconc (proto-fields message) (list field))))))) (if alias-for ;; If we've got an alias, define a a type that is the subtype of ;; the Lisp class that typep and subtypep work (unless (or (eq type alias-for) (find-class type nil)) (collect-form `(deftype ,type () ',alias-for))) ;; If no alias, define the class now (collect-form `(defclass ,type () (,@slots) ,@(and documentation `((:documentation ,documentation)))))) `(progn define-group ,message ((with-proto-source-location (,type ,name protobuf-message ,@source-location) ,@forms)) ,mfield ,mslot)))) (defun process-field (field index &key conc-name alias-for) "Process one field descriptor within 'define-message' or 'define-extend'. Returns a 'proto-field' object, a CLOS slot form and the incremented field index." (when (i= index 18999) ;skip over the restricted range (setq index 19999)) (destructuring-bind (slot &rest other-options &key type reader writer name (default nil default-p) packed ((:index idx)) options documentation &allow-other-keys) field ;; Allow old ((slot index) ...) or new (slot :index ...), ;; but only allow one of those two to be used simultaneously (assert (if idx (not (listp slot)) t) () "Use either ((slot index) ...) or (slot :index index ...), but not both") (let* ((idx (or idx (if (listp slot) (second slot) (iincf index)))) (slot (if (listp slot) (first slot) slot)) (reader (or reader (and conc-name (intern (format nil "~A~A" conc-name slot) *protobuf-package*)))) (options (append (loop for (key val) on other-options by #'cddr unless (member key '(:type :reader :writer :name :default :packed :documentation)) collect (make-instance 'protobuf-option :name (slot-name->proto key) :value val)) (loop for (key val) on options by #'cddr collect (make-instance 'protobuf-option :name (if (symbolp key) (slot-name->proto key) key) :value val))))) (multiple-value-bind (ptype pclass) (clos-type-to-protobuf-type type) (multiple-value-bind (reqd vectorp) (clos-type-to-protobuf-required type) (let* ((default (if (eq reqd :repeated) (if vectorp $empty-vector $empty-list) ;to distinguish between list-of and vector-of (if default-p default $empty-default))) (cslot (unless alias-for `(,slot :type ,type ,@(and reader (if writer `(:reader ,reader) `(:accessor ,reader))) ,@(and writer `(:writer ,writer)) :initarg ,(kintern (symbol-name slot)) ,@(cond ((eq reqd :repeated) ;; Repeated fields get a container for their elements (if vectorp `(:initform (make-array 5 :fill-pointer 0 :adjustable t)) `(:initform ()))) ((and (not default-p) (eq reqd :optional) ;; Use unbound for booleans only (not (eq pclass :bool))) `(:initform nil)) (default-p `(:initform ,(protobuf-default-to-clos-init default type))))))) (field (make-instance 'protobuf-field :name (or name (slot-name->proto slot)) :type ptype :class pclass :qualified-name (make-qualified-name *protobuf* (or name (slot-name->proto slot))) :parent *protobuf* ;; One of :required, :optional or :repeated :required reqd :index idx :value slot :reader reader :writer writer :default default ;; Pack the field only if requested and it actually makes sense :packed (and (eq reqd :repeated) packed t) :options options :documentation documentation))) (values field cslot idx))))))) (defparameter *rpc-package* nil "The Lisp package that implements RPC. This should be set when an RPC package that uses CL-Protobufs gets loaded.") (defparameter *rpc-call-function* nil "The Lisp function that implements RPC client-side calls. This should be set when an RPC package that uses CL-Protobufs gets loaded.") ;; Define a service named 'type' with generic functions declared for ;; each of the methods within the service (defmacro define-service (type (&key name options documentation source-location) &body method-specs) "Define a service named 'type' and Lisp 'defgeneric' for all its methods. 'name' can be used to override the defaultly generated Protobufs service name. 'options' is a set of keyword/value pairs, both of which are strings. The body is a set of method specs of the form (name (input-type [=>] output-type) &key options). 'input-type' and 'output-type' may also be of the form (type &key name)." (let* ((name (or name (class-name->proto type))) (options (loop for (key val) on options by #'cddr collect (make-instance 'protobuf-option :name (if (symbolp key) (slot-name->proto key) key) :value val))) (service (make-instance 'protobuf-service :class type :name name :qualified-name (make-qualified-name *protobuf* name) :parent *protobuf* :options options :documentation documentation :source-location source-location)) (index 0)) (with-collectors ((forms collect-form)) (dolist (method method-specs) (destructuring-bind (function (&rest types) &key name options documentation source-location) method (let* ((input-type (first types)) (output-type (if (string= (string (second types)) "=>") (third types) (second types))) (streams-type (if (string= (string (second types)) "=>") (getf (cdddr types) :streams) (getf (cddr types) :streams))) (input-name (and (listp input-type) (getf (cdr input-type) :name))) (input-type (if (listp input-type) (car input-type) input-type)) (output-name (and (listp output-type) (getf (cdr output-type) :name))) (output-type (if (listp output-type) (car output-type) output-type)) (streams-name (and (listp streams-type) (getf (cdr streams-type) :name))) (streams-type (if (listp streams-type) (car streams-type) streams-type)) (options (loop for (key val) on options by #'cddr collect (make-instance 'protobuf-option :name (if (symbolp key) (slot-name->proto key) key) :value val))) (package *protobuf-package*) (client-fn function) (server-fn (intern (format nil "~A-~A" 'do function) package)) (method (make-instance 'protobuf-method :class function :name (or name (class-name->proto function)) :qualified-name (make-qualified-name *protobuf* (or name (class-name->proto function))) :parent service :client-stub client-fn :server-stub server-fn :input-type input-type :input-name (or input-name (class-name->proto input-type)) :output-type output-type :output-name (or output-name (class-name->proto output-type)) :streams-type streams-type :streams-name (and streams-type (or streams-name (class-name->proto streams-type))) :index (iincf index) :options options :documentation documentation :source-location source-location))) (setf (proto-methods service) (nconc (proto-methods service) (list method))) ;; The following are the hooks to an RPC implementation (let* ((vrequest (intern (symbol-name 'request) package)) (vchannel (intern (symbol-name 'channel) package)) (vcallback (intern (symbol-name 'callback) package))) ;; The client side stub, e.g., 'read-air-reservation'. ;; The expectation is that the RPC implementation will provide code to make it ;; easy to implement a method for this on each kind of channel (HTTP, TCP socket, ;; IPC, etc). Unlike C++/Java/Python, we don't need a client-side subclass, ;; because we can just use multi-methods. ;; The 'do-XXX' method calls the RPC code with the channel, the method ;; (i.e., a 'protobuf-method' object), the request and the callback function. ;; The RPC code should take care of serializing the input, transmitting the ;; request over the wire, waiting for input (or not if it's asynchronous), ;; filling in the output, and either returning the response (if synchronous) ;; or calling the callback with the response as an argument (if asynchronous). ;; It will also deserialize the response so that the client code sees the ;; response as an application object. (collect-form `(defgeneric ,client-fn (,vchannel ,vrequest &key ,vcallback) ,@(and documentation `((:documentation ,documentation))) #-sbcl (declare (values ,output-type)) (:method (,vchannel (,vrequest ,input-type) &key ,vcallback) (declare (ignorable ,vchannel ,vcallback)) (let ((call (and *rpc-package* *rpc-call-function*))) (assert call () "There is no RPC package loaded!") (funcall call ,vchannel ',method ,vrequest :callback ,vcallback))))) ;; The server side stub, e.g., 'do-read-air-reservation'. ;; The expectation is that the server-side program will implement ;; a method with the business logic for this on each kind of channel ;; (HTTP, TCP socket, IPC, etc), possibly on a server-side subclass ;; of the input class. ;; The business logic is expected to perform the correct operations on ;; the input object, which arrived via Protobufs, and produce an output ;; of the given type, which will be serialized and sent back over the wire. ;; The channel objects hold client identity information, deadline info, ;; etc, and can be side-effected to indicate success or failure. ;; The RPC code provides the channel classes and does (de)serialization, etc (collect-form `(defgeneric ,server-fn (,vchannel ,vrequest) ,@(and documentation `((:documentation ,documentation))) #-sbcl (declare (values ,output-type)))))))) `(progn define-service ,service ((with-proto-source-location (,type ,name protobuf-service ,@source-location) ,@forms)))))) ;; Lisp-only type aliases (defmacro define-type-alias (type (&key name alias-for documentation source-location) &key lisp-type proto-type serializer deserializer) "Define a Protobufs type alias Lisp 'deftype' named 'type'. 'lisp-type' is the name of the Lisp type. 'proto-type' is the name of a primitive Protobufs type, e.g., 'int32' or 'string'. 'serializer' is a function that takes a Lisp object and generates a Protobufs object. 'deserializer' is a function that takes a Protobufs object and generates a Lisp object. If 'alias-for' is given, no Lisp 'deftype' will be defined." (let* ((name (or name (class-name->proto type))) (proto (multiple-value-bind (typ cl) (lisp-type-to-protobuf-type proto-type) (declare (ignore typ)) (assert (keywordp cl) () "The alias ~S must resolve to a Protobufs primitive type" type) cl)) (alias (make-instance 'protobuf-type-alias :class type :name name :lisp-type lisp-type :proto-type proto :serializer serializer :deserializer deserializer :qualified-name (make-qualified-name *protobuf* name) :parent *protobuf* :documentation documentation :source-location source-location))) (with-collectors ((forms collect-form)) (if alias-for ;; If we've got an alias, define a a type that is the subtype of ;; the Lisp enum so that typep and subtypep work (unless (eq type alias-for) (collect-form `(deftype ,type () ',alias-for))) ;; If no alias, define the Lisp enum type now (collect-form `(deftype ,type () ',lisp-type))) `(progn define-type-alias ,alias ((with-proto-source-location (,type ,name protobuf-type-alias ,@source-location) ,@forms)))))) ;;; Ensure everything in a Protobufs schema is defined (defvar *undefined-messages*) ;; A very useful tool during development... (defun ensure-all-schemas () (let ((protos (sort (delete-duplicates (loop for p being the hash-values of *all-schemas* collect p)) #'string< :key #'proto-name))) (mapcan #'ensure-schema protos))) (defgeneric ensure-schema (schema) (:documentation "Ensure that all of the types are defined in the Protobufs schema 'schema'. This returns two values: - A list whose elements are ( \"message:field\" ...) - The accumulated warnings table that has the same information as objects.") (:method ((schema protobuf-schema)) (let ((*undefined-messages* (make-hash-table)) (trace (list schema))) (map () (curry #'ensure-message trace) (proto-messages schema)) (map () (curry #'ensure-service trace) (proto-services schema)) (loop for type being the hash-keys of *undefined-messages* using (hash-value things) collect (list* type (mapcar #'(lambda (thing) (format nil "~A:~A" (proto-name (car thing)) (proto-name (cdr thing)))) things)) into warnings finally (return (values warnings *undefined-messages*)))))) (defgeneric ensure-message (trace message) (:method (trace (message protobuf-message)) (let ((trace (cons message trace))) (map () (curry #'ensure-message trace) (proto-messages message)) (map () (curry #'ensure-field trace message) (proto-fields message))))) (defgeneric ensure-field (trace message field) (:method (trace message (field protobuf-field)) (ensure-type trace message field (proto-class field)))) (defgeneric ensure-service (trace service) (:method (trace (service protobuf-service)) (map () (curry #'ensure-method trace service) (proto-methods service)))) (defgeneric ensure-method (trace service method) (:method (trace service (method protobuf-method)) (ensure-type trace service method (proto-input-type method)) (ensure-type trace service method (proto-output-type method)) (ensure-type trace service method (proto-streams-type method)))) ;; 'message' and 'field' can be a message and a field or a service and a method (defun ensure-type (trace message field type) (unless (keywordp type) (let ((msg (loop for p in trace thereis (or (find-message p type) (find-enum p type))))) (unless msg (push (cons message field) (gethash type *undefined-messages*))))))