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bh=0fzVBihPpVNV5cVfGMBl+fBxOh7yT7S6KuXegwY+jes=; b=V0ZCdyDnMqVA6UMC6c+9YBvZA9LdRFf4dj8upTCSlOrihzhtjHTNK37wwolPaVTSpuvzQp LKkKXLH7QVIpZCkiwWFCXSw2+5ZkTaBEebTptg45n87q8sW2eF8V+G2sB5Y+gMuBrNT4lo Db3qwZRAWF8DAubOd05AlzPibyhcBwc= X-MC-Unique: 4WOMpWIRMjue2PCn6pjKxg-1 From: Victor Toso To: qemu-devel@nongnu.org Cc: Markus Armbruster , John Snow , =?UTF-8?q?Daniel=20P=20=2E=20Berrang=C3=A9?= Subject: [PATCH v1 8/9] qapi: golang: Add CommandResult type to Go Date: Wed, 27 Sep 2023 13:25:43 +0200 Message-ID: <20230927112544.85011-9-victortoso@redhat.com> In-Reply-To: <20230927112544.85011-1-victortoso@redhat.com> References: <20230927112544.85011-1-victortoso@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=victortoso@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1695814060887100001 Content-Type: text/plain; charset="utf-8" This patch adds a struct type in Go that will handle return values for QAPI's command types. The return value of a Command is, encouraged to be, QAPI's complex types or an Array of those. Every Command has a underlying CommandResult. The EmptyCommandReturn is for those that don't expect any data e.g: `{ "return": {} }`. All CommandReturn types implement the CommandResult interface. Example: qapi: | { 'command': 'query-sev', 'returns': 'SevInfo', | 'if': 'TARGET_I386' } go: | type QuerySevCommandReturn struct { | CommandId string `json:"id,omitempty"` | Result *SevInfo `json:"return"` | Error *QapiError `json:"error,omitempty"` | } usage: | // One can use QuerySevCommandReturn directly or | // command's interface GetReturnType() instead. | | input :=3D `{ "return": { "enabled": true, "api-major" : 0,` + | `"api-minor" : 0, "build-id" : 0,` + | `"policy" : 0, "state" : "running",` + | `"handle" : 1 } } ` | | ret :=3D QuerySevCommandReturn{} | err :=3D json.Unmarshal([]byte(input), &ret) | if ret.Error !=3D nil { | // Handle command failure {"error": { ...}} | } else if ret.Result !=3D nil { | // ret.Result.Enable =3D=3D true | } Signed-off-by: Victor Toso --- scripts/qapi/golang.py | 72 ++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 70 insertions(+), 2 deletions(-) diff --git a/scripts/qapi/golang.py b/scripts/qapi/golang.py index 52a9124641..48ca0deab0 100644 --- a/scripts/qapi/golang.py +++ b/scripts/qapi/golang.py @@ -40,6 +40,15 @@ ''' =20 TEMPLATE_HELPER =3D ''' +type QapiError struct { + Class string `json:"class"` + Description string `json:"desc"` +} + +func (err *QapiError) Error() string { + return fmt.Sprintf("%s: %s", err.Class, err.Description) +} + // Creates a decoder that errors on unknown Fields // Returns nil if successfully decoded @from payload to @into type // Returns error if failed to decode @from payload to @into type @@ -254,12 +263,17 @@ func (s *{type_name}) GetId() string {{ return s.MessageId }} + +func (s *{type_name}) GetReturnType() CommandReturn {{ + return &{cmd_ret_name}{{}} +}} ''' =20 TEMPLATE_COMMAND =3D ''' type Command interface {{ GetId() string GetName() string + GetReturnType() CommandReturn }} =20 func MarshalCommand(c Command) ([]byte, error) {{ @@ -292,6 +306,45 @@ }} ''' =20 +TEMPLATE_COMMAND_RETURN =3D ''' +type CommandReturn interface { + GetId() string + GetCommandName() string + GetError() error +} +''' + +TEMPLATE_COMMAND_RETURN_METHODS =3D ''' +type {cmd_ret_name} struct {{ + MessageId string `json:"id,omitempty"` + Error *QapiError `json:"error,omitempty"` +{result} +}} + +func (r *{cmd_ret_name}) GetCommandName() string {{ + return "{name}" +}} + +func (r *{cmd_ret_name}) GetId() string {{ + return r.MessageId +}} + +func (r *{cmd_ret_name}) GetError() error {{ + return r.Error +}} + +{marshal_empty} +''' + +TEMPLATE_COMMAND_RETURN_MARSHAL_EMPTY =3D ''' +func (r {cmd_ret_name}) MarshalJSON() ([]byte, error) {{ + if r.Error !=3D nil {{ + type Alias {cmd_ret_name} + return json.Marshal(Alias(r)) + }} + return []byte(`{{"return":{{}}}}`), nil +}}''' + def gen_golang(schema: QAPISchema, output_dir: str, prefix: str) -> None: @@ -327,7 +380,7 @@ def qapi_to_go_type_name(name: str, =20 name +=3D ''.join(word.title() for word in words[1:]) =20 - types =3D ["event", "command"] + types =3D ["event", "command", "command return"] if meta in types: name =3D name[:-3] if name.endswith("Arg") else name name +=3D meta.title().replace(" ", "") @@ -783,6 +836,7 @@ def generate_template_command(commands: dict[str, str])= -> str: return &command.Args, nil ''' content =3D TEMPLATE_COMMAND.format(cases=3Dcases) + content +=3D TEMPLATE_COMMAND_RETURN return content =20 =20 @@ -926,6 +980,15 @@ def visit_command(self, type_name =3D qapi_to_go_type_name(name, info.defn_meta) self.commands[name] =3D type_name =20 + cmd_ret_name =3D qapi_to_go_type_name(name, "command return") + marshal_empty =3D TEMPLATE_COMMAND_RETURN_MARSHAL_EMPTY.format(cmd= _ret_name=3Dcmd_ret_name) + result =3D "" + if ret_type: + marshal_empty =3D "" + ret_type_name =3D qapi_schema_type_to_go_type(ret_type.name) + isptr =3D "*" if ret_type_name[0] not in "*[" else "" + result =3D f'''Result {isptr}{ret_type_name} `json:"return"= `''' + content =3D "" if boxed or not arg_type or not qapi_name_is_object(arg_type.name): args =3D "" if not arg_type else "\n" + arg_type.name @@ -943,7 +1006,12 @@ def visit_command(self, arg_type.variants) =20 content +=3D TEMPLATE_COMMAND_METHODS.format(name=3Dname, - type_name=3Dtype_name) + type_name=3Dtype_name, + cmd_ret_name=3Dcmd_ret_= name) + content +=3D TEMPLATE_COMMAND_RETURN_METHODS.format(name=3Dname, + cmd_ret_name=3Dc= md_ret_name, + result=3Dresult, + marshal_empty=3D= marshal_empty) self.target["command"] +=3D content =20 def visit_event(self, name, info, ifcond, features, arg_type, boxed): --=20 2.41.0