1 // Copyright (c) 2018 Cisco and/or its affiliates.
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at:
7 // http://www.apache.org/licenses/LICENSE-2.0
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
23 "github.com/bennyscetbun/jsongo"
24 "github.com/sirupsen/logrus"
30 objMessages = "messages"
33 objServices = "services"
34 objAliases = "aliases"
35 vlAPIVersion = "vl_api_version"
36 objOptions = "options"
39 // various object fields
42 msgIdField = "_vl_msg_id"
44 clientIndexField = "client_index"
45 contextField = "context"
47 aliasLengthField = "length"
48 aliasTypeField = "type"
51 streamField = "stream"
52 eventsField = "events"
57 serviceEventPrefix = "want_"
58 serviceDumpSuffix = "_dump"
59 serviceDetailsSuffix = "_details"
60 serviceReplySuffix = "_reply"
61 serviceNoReply = "null"
66 fieldMetaLimit = "limit"
71 versionOption = "version"
74 // parsePackage parses provided JSON data into objects prepared for code generation
75 func parsePackage(ctx *context, jsonRoot *jsongo.JSONNode) (*Package, error) {
77 Name: ctx.packageName,
78 RefMap: make(map[string]string),
81 // parse CRC for API version
82 if crc := jsonRoot.At(vlAPIVersion); crc.GetType() == jsongo.TypeValue {
83 pkg.CRC = crc.Get().(string)
86 // parse version string
87 if opt := jsonRoot.Map(objOptions); opt.GetType() == jsongo.TypeMap {
88 if ver := opt.Map(versionOption); ver.GetType() == jsongo.TypeValue {
89 pkg.Version = ver.Get().(string)
93 logf("parsing package %s (version: %s, CRC: %s)", pkg.Name, pkg.Version, pkg.CRC)
95 for _, key := range jsonRoot.GetKeys() {
96 logf(" - %d %s", jsonRoot.At(key).Len(), key)
100 enums := jsonRoot.Map(objEnums)
101 pkg.Enums = make([]Enum, enums.Len())
102 for i := 0; i < enums.Len(); i++ {
103 enumNode := enums.At(i)
105 enum, err := parseEnum(ctx, enumNode)
110 pkg.RefMap[toApiType(enum.Name)] = enum.Name
113 sort.SliceStable(pkg.Enums, func(i, j int) bool {
114 return pkg.Enums[i].Name < pkg.Enums[j].Name
118 aliases := jsonRoot.Map(objAliases)
119 if aliases.GetType() == jsongo.TypeMap {
120 pkg.Aliases = make([]Alias, aliases.Len())
121 for i, key := range aliases.GetKeys() {
122 aliasNode := aliases.At(key)
124 alias, err := parseAlias(ctx, key.(string), aliasNode)
128 pkg.Aliases[i] = *alias
129 pkg.RefMap[toApiType(alias.Name)] = alias.Name
132 // sort aliases to ensure consistent order
133 sort.Slice(pkg.Aliases, func(i, j int) bool {
134 return pkg.Aliases[i].Name < pkg.Aliases[j].Name
138 types := jsonRoot.Map(objTypes)
139 pkg.Types = make([]Type, types.Len())
140 for i := 0; i < types.Len(); i++ {
141 typNode := types.At(i)
143 typ, err := parseType(ctx, typNode)
148 pkg.RefMap[toApiType(typ.Name)] = typ.Name
151 sort.SliceStable(pkg.Types, func(i, j int) bool {
152 return pkg.Types[i].Name < pkg.Types[j].Name
156 unions := jsonRoot.Map(objUnions)
157 pkg.Unions = make([]Union, unions.Len())
158 for i := 0; i < unions.Len(); i++ {
159 unionNode := unions.At(i)
161 union, err := parseUnion(ctx, unionNode)
165 pkg.Unions[i] = *union
166 pkg.RefMap[toApiType(union.Name)] = union.Name
169 sort.SliceStable(pkg.Unions, func(i, j int) bool {
170 return pkg.Unions[i].Name < pkg.Unions[j].Name
174 messages := jsonRoot.Map(objMessages)
175 pkg.Messages = make([]Message, messages.Len())
176 for i := 0; i < messages.Len(); i++ {
177 msgNode := messages.At(i)
179 msg, err := parseMessage(ctx, msgNode)
183 pkg.Messages[i] = *msg
186 sort.SliceStable(pkg.Messages, func(i, j int) bool {
187 return pkg.Messages[i].Name < pkg.Messages[j].Name
191 services := jsonRoot.Map(objServices)
192 if services.GetType() == jsongo.TypeMap {
193 pkg.Services = make([]Service, services.Len())
194 for i, key := range services.GetKeys() {
195 svcNode := services.At(key)
197 svc, err := parseService(ctx, key.(string), svcNode)
201 pkg.Services[i] = *svc
205 sort.Slice(pkg.Services, func(i, j int) bool {
207 if pkg.Services[i].Stream != pkg.Services[j].Stream {
208 return pkg.Services[i].Stream
210 return pkg.Services[i].RequestType < pkg.Services[j].RequestType
218 // parseEnum parses VPP binary API enum object from JSON node
219 func parseEnum(ctx *context, enumNode *jsongo.JSONNode) (*Enum, error) {
220 if enumNode.Len() == 0 || enumNode.At(0).GetType() != jsongo.TypeValue {
221 return nil, errors.New("invalid JSON for enum specified")
224 enumName, ok := enumNode.At(0).Get().(string)
226 return nil, fmt.Errorf("enum name is %T, not a string", enumNode.At(0).Get())
228 enumType, ok := enumNode.At(enumNode.Len() - 1).At("enumtype").Get().(string)
230 return nil, fmt.Errorf("enum type invalid or missing")
238 // loop through enum entries, skip first (name) and last (enumtype)
239 for j := 1; j < enumNode.Len()-1; j++ {
240 if enumNode.At(j).GetType() == jsongo.TypeArray {
241 entry := enumNode.At(j)
243 if entry.Len() < 2 || entry.At(0).GetType() != jsongo.TypeValue || entry.At(1).GetType() != jsongo.TypeValue {
244 return nil, errors.New("invalid JSON for enum entry specified")
247 entryName, ok := entry.At(0).Get().(string)
249 return nil, fmt.Errorf("enum entry name is %T, not a string", entry.At(0).Get())
251 entryVal := entry.At(1).Get()
253 enum.Entries = append(enum.Entries, EnumEntry{
263 // parseUnion parses VPP binary API union object from JSON node
264 func parseUnion(ctx *context, unionNode *jsongo.JSONNode) (*Union, error) {
265 if unionNode.Len() == 0 || unionNode.At(0).GetType() != jsongo.TypeValue {
266 return nil, errors.New("invalid JSON for union specified")
269 unionName, ok := unionNode.At(0).Get().(string)
271 return nil, fmt.Errorf("union name is %T, not a string", unionNode.At(0).Get())
274 if unionNode.At(unionNode.Len()-1).GetType() == jsongo.TypeMap {
275 unionCRC = unionNode.At(unionNode.Len() - 1).At(crcField).Get().(string)
283 // loop through union fields, skip first (name)
284 for j := 1; j < unionNode.Len(); j++ {
285 if unionNode.At(j).GetType() == jsongo.TypeArray {
286 fieldNode := unionNode.At(j)
288 field, err := parseField(ctx, fieldNode)
293 union.Fields = append(union.Fields, *field)
300 // parseType parses VPP binary API type object from JSON node
301 func parseType(ctx *context, typeNode *jsongo.JSONNode) (*Type, error) {
302 if typeNode.Len() == 0 || typeNode.At(0).GetType() != jsongo.TypeValue {
303 return nil, errors.New("invalid JSON for type specified")
306 typeName, ok := typeNode.At(0).Get().(string)
308 return nil, fmt.Errorf("type name is %T, not a string", typeNode.At(0).Get())
311 if lastField := typeNode.At(typeNode.Len() - 1); lastField.GetType() == jsongo.TypeMap {
312 typeCRC = lastField.At(crcField).Get().(string)
320 // loop through type fields, skip first (name)
321 for j := 1; j < typeNode.Len(); j++ {
322 if typeNode.At(j).GetType() == jsongo.TypeArray {
323 fieldNode := typeNode.At(j)
325 field, err := parseField(ctx, fieldNode)
330 typ.Fields = append(typ.Fields, *field)
337 // parseAlias parses VPP binary API alias object from JSON node
338 func parseAlias(ctx *context, aliasName string, aliasNode *jsongo.JSONNode) (*Alias, error) {
339 if aliasNode.Len() == 0 || aliasNode.At(aliasTypeField).GetType() != jsongo.TypeValue {
340 return nil, errors.New("invalid JSON for alias specified")
347 if typeNode := aliasNode.At(aliasTypeField); typeNode.GetType() == jsongo.TypeValue {
348 typ, ok := typeNode.Get().(string)
350 return nil, fmt.Errorf("alias type is %T, not a string", typeNode.Get())
357 if lengthNode := aliasNode.At(aliasLengthField); lengthNode.GetType() == jsongo.TypeValue {
358 length, ok := lengthNode.Get().(float64)
360 return nil, fmt.Errorf("alias length is %T, not a float64", lengthNode.Get())
362 alias.Length = int(length)
368 // parseMessage parses VPP binary API message object from JSON node
369 func parseMessage(ctx *context, msgNode *jsongo.JSONNode) (*Message, error) {
370 if msgNode.Len() == 0 || msgNode.At(0).GetType() != jsongo.TypeValue {
371 return nil, errors.New("invalid JSON for message specified")
374 msgName, ok := msgNode.At(0).Get().(string)
376 return nil, fmt.Errorf("message name is %T, not a string", msgNode.At(0).Get())
378 msgCRC, ok := msgNode.At(msgNode.Len() - 1).At(crcField).Get().(string)
381 return nil, fmt.Errorf("message crc invalid or missing")
389 // loop through message fields, skip first (name) and last (crc)
390 for j := 1; j < msgNode.Len()-1; j++ {
391 if msgNode.At(j).GetType() == jsongo.TypeArray {
392 fieldNode := msgNode.At(j)
394 field, err := parseField(ctx, fieldNode)
399 msg.Fields = append(msg.Fields, *field)
406 // parseField parses VPP binary API object field from JSON node
407 func parseField(ctx *context, field *jsongo.JSONNode) (*Field, error) {
408 if field.Len() < 2 || field.At(0).GetType() != jsongo.TypeValue || field.At(1).GetType() != jsongo.TypeValue {
409 return nil, errors.New("invalid JSON for field specified")
412 fieldType, ok := field.At(0).Get().(string)
414 return nil, fmt.Errorf("field type is %T, not a string", field.At(0).Get())
416 fieldName, ok := field.At(1).Get().(string)
418 return nil, fmt.Errorf("field name is %T, not a string", field.At(1).Get())
426 if field.Len() >= 3 {
427 if field.At(2).GetType() == jsongo.TypeValue {
428 fieldLength, ok := field.At(2).Get().(float64)
430 return nil, fmt.Errorf("field length is %T, not float64", field.At(2).Get())
432 f.Length = int(fieldLength)
433 } else if field.At(2).GetType() == jsongo.TypeMap {
434 fieldMeta := field.At(2)
436 for _, key := range fieldMeta.GetKeys() {
437 metaNode := fieldMeta.At(key)
439 switch metaName := key.(string); metaName {
441 f.Meta.Limit = int(metaNode.Get().(float64))
443 logrus.Warnf("unknown meta info (%s) for field (%s)", metaName, fieldName)
447 return nil, errors.New("invalid JSON for field specified")
450 if field.Len() >= 4 {
451 fieldLengthFrom, ok := field.At(3).Get().(string)
453 return nil, fmt.Errorf("field length from is %T, not a string", field.At(3).Get())
455 f.SizeFrom = fieldLengthFrom
461 // parseService parses VPP binary API service object from JSON node
462 func parseService(ctx *context, svcName string, svcNode *jsongo.JSONNode) (*Service, error) {
463 if svcNode.Len() == 0 || svcNode.At(replyField).GetType() != jsongo.TypeValue {
464 return nil, errors.New("invalid JSON for service specified")
469 RequestType: svcName,
472 if replyNode := svcNode.At(replyField); replyNode.GetType() == jsongo.TypeValue {
473 reply, ok := replyNode.Get().(string)
475 return nil, fmt.Errorf("service reply is %T, not a string", replyNode.Get())
477 if reply != serviceNoReply {
478 svc.ReplyType = reply
482 // stream service (dumps)
483 if streamNode := svcNode.At(streamField); streamNode.GetType() == jsongo.TypeValue {
485 svc.Stream, ok = streamNode.Get().(bool)
487 return nil, fmt.Errorf("service stream is %T, not a string", streamNode.Get())
491 // events service (event subscription)
492 if eventsNode := svcNode.At(eventsField); eventsNode.GetType() == jsongo.TypeArray {
493 for j := 0; j < eventsNode.Len(); j++ {
494 event := eventsNode.At(j).Get().(string)
495 svc.Events = append(svc.Events, event)
500 if len(svc.Events) > 0 {
502 if !strings.HasPrefix(svc.RequestType, serviceEventPrefix) {
503 logrus.Debugf("unusual EVENTS service: %+v\n"+
504 "- events service %q does not have %q prefix in request.",
505 svc, svc.Name, serviceEventPrefix)
507 } else if svc.Stream {
509 if !strings.HasSuffix(svc.RequestType, serviceDumpSuffix) ||
510 !strings.HasSuffix(svc.ReplyType, serviceDetailsSuffix) {
511 logrus.Debugf("unusual STREAM service: %+v\n"+
512 "- stream service %q does not have %q suffix in request or reply does not have %q suffix.",
513 svc, svc.Name, serviceDumpSuffix, serviceDetailsSuffix)
515 } else if svc.ReplyType != "" && svc.ReplyType != serviceNoReply {
517 // some messages might have `null` reply (for example: memclnt)
518 if !strings.HasSuffix(svc.ReplyType, serviceReplySuffix) {
519 logrus.Debugf("unusual REQUEST service: %+v\n"+
520 "- service %q does not have %q suffix in reply.",
521 svc, svc.Name, serviceReplySuffix)