gRPC的proto内import其他proto导致的一次小坑
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1.对于一些proto里面的定义，如果包含了 引入其他proto文件的 proto文件来说，生成的时候要注意。尤其是 引入的是官方框架内的 proto文件，如果自己没有提供的话，生成代码会报错！
具体错误可以通过命令行工具 或者 vs的包控制台查看，这些错误可能 导致一系列的报错，未定义之类的错误，其实核心问题就是 缺少对应的 官方proto，比如：
2.我的做法暂时是把 相关的文件一起找到，然后放到对应的目录下。这样就能根据元数据 proto正常生出 cs的代码文件了。
附：两个比较难找的 google官方的proto文件。
google/protobuf/descriptor.proto
// Protocol Buffers - Google‘s data interchange format // Copyright 2008 Google Inc. All rights reserved. // https://developers.google.com/protocol-buffers/ // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. // Author: [email protected] (Kenton Varda) // Based on original Protocol Buffers design by // Sanjay Ghemawat, Jeff Dean, and others. // // The messages in this file describe the definitions found in .proto files. // A valid .proto file can be translated directly to a FileDescriptorProto // without any other information (e.g. without reading its imports). syntax = "proto2"; package google.protobuf; option go_package = "github.com/golang/protobuf/protoc-gen-go/descriptor;descriptor"; option java_package = "com.google.protobuf"; option java_outer_classname = "DescriptorProtos"; option csharp_namespace = "Google.Protobuf.Reflection"; option objc_class_prefix = "GPB"; option cc_enable_arenas = true; // descriptor.proto must be optimized for speed because reflection-based // algorithms don‘t work during bootstrapping. option optimize_for = SPEED; // The protocol compiler can output a FileDescriptorSet containing the .proto // files it parses. message FileDescriptorSet { repeated FileDescriptorProto file = 1; } // Describes a complete .proto file. message FileDescriptorProto { optional string name = 1; // file name, relative to root of source tree optional string package = 2; // e.g. "foo", "foo.bar", etc. // Names of files imported by this file. repeated string dependency = 3; // Indexes of the public imported files in the dependency list above. repeated int32 public_dependency = 10; // Indexes of the weak imported files in the dependency list. // For Google-internal migration only. Do not use. repeated int32 weak_dependency = 11; // All top-level definitions in this file. repeated DescriptorProto message_type = 4; repeated EnumDescriptorProto enum_type = 5; repeated ServiceDescriptorProto service = 6; repeated FieldDescriptorProto extension = 7; optional FileOptions options = 8; // This field contains optional information about the original source code. // You may safely remove this entire field without harming runtime // functionality of the descriptors -- the information is needed only by // development tools. optional SourceCodeInfo source_code_info = 9; // The syntax of the proto file. // The supported values are "proto2" and "proto3". optional string syntax = 12; } // Describes a message type. message DescriptorProto { optional string name = 1; repeated FieldDescriptorProto field = 2; repeated FieldDescriptorProto extension = 6; repeated DescriptorProto nested_type = 3; repeated EnumDescriptorProto enum_type = 4; message ExtensionRange { optional int32 start = 1; optional int32 end = 2; optional ExtensionRangeOptions options = 3; } repeated ExtensionRange extension_range = 5; repeated OneofDescriptorProto oneof_decl = 8; optional MessageOptions options = 7; // Range of reserved tag numbers. Reserved tag numbers may not be used by // fields or extension ranges in the same message. Reserved ranges may // not overlap. message ReservedRange { optional int32 start = 1; // Inclusive. optional int32 end = 2; // Exclusive. } repeated ReservedRange reserved_range = 9; // Reserved field names, which may not be used by fields in the same message. // A given name may only be reserved once. repeated string reserved_name = 10; } message ExtensionRangeOptions { // The parser stores options it doesn‘t recognize here. See above. repeated UninterpretedOption uninterpreted_option = 999; // Clients can define custom options in extensions of this message. See above. extensions 1000 to max; } // Describes a field within a message. message FieldDescriptorProto { enum Type { // 0 is reserved for errors. // Order is weird for historical reasons. TYPE_DOUBLE = 1; TYPE_FLOAT = 2; // Not ZigZag encoded. Negative numbers take 10 bytes. Use TYPE_SINT64 if // negative values are likely. TYPE_INT64 = 3; TYPE_UINT64 = 4; // Not ZigZag encoded. Negative numbers take 10 bytes. Use TYPE_SINT32 if // negative values are likely. TYPE_INT32 = 5; TYPE_FIXED64 = 6; TYPE_FIXED32 = 7; TYPE_BOOL = 8; TYPE_STRING = 9; // Tag-delimited aggregate. // Group type is deprecated and not supported in proto3. However, Proto3 // implementations should still be able to parse the group wire format and // treat group fields as unknown fields. TYPE_GROUP = 10; TYPE_MESSAGE = 11; // Length-delimited aggregate. // New in version 2. TYPE_BYTES = 12; TYPE_UINT32 = 13; TYPE_ENUM = 14; TYPE_SFIXED32 = 15; TYPE_SFIXED64 = 16; TYPE_SINT32 = 17; // Uses ZigZag encoding. TYPE_SINT64 = 18; // Uses ZigZag encoding. }; enum Label { // 0 is reserved for errors LABEL_OPTIONAL = 1; LABEL_REQUIRED = 2; LABEL_REPEATED = 3; }; optional string name = 1; optional int32 number = 3; optional Label label = 4; // If type_name is set, this need not be set. If both this and type_name // are set, this must be one of TYPE_ENUM, TYPE_MESSAGE or TYPE_GROUP. optional Type type = 5; // For message and enum types, this is the name of the type. If the name // starts with a ‘.‘, it is fully-qualified. Otherwise, C++-like scoping // rules are used to find the type (i.e. first the nested types within this // message are searched, then within the parent, on up to the root // namespace). optional string type_name = 6; // For extensions, this is the name of the type being extended. It is // resolved in the same manner as type_name. optional string extendee = 2; // For numeric types, contains the original text representation of the value. // For booleans, "true" or "false". // For strings, contains the default text contents (not escaped in any way). // For bytes, contains the C escaped value. All bytes >= 128 are escaped. // TODO(kenton): Base-64 encode? optional string default_value = 7; // If set, gives the index of a oneof in the containing type‘s oneof_decl // list. This field is a member of that oneof. optional int32 oneof_index = 9; // JSON name of this field. The value is set by protocol compiler. If the // user has set a "json_name" option on this field, that option‘s value // will be used. Otherwise, it‘s deduced from the field‘s name by converting // it to camelCase. optional string json_name = 10; optional FieldOptions options = 8; } // Describes a oneof. message OneofDescriptorProto { optional string name = 1; optional OneofOptions options = 2; } // Describes an enum type. message EnumDescriptorProto { optional string name = 1; repeated EnumValueDescriptorProto value = 2; optional EnumOptions options = 3; // Range of reserved numeric values. Reserved values may not be used by // entries in the same enum. Reserved ranges may not overlap. // // Note that this is distinct from DescriptorProto.ReservedRange in that it // is inclusive such that it can appropriately represent the entire int32 // domain. message EnumReservedRange { optional int32 start = 1; // Inclusive. optional int32 end = 2; // Inclusive. } // Range of reserved numeric values. Reserved numeric values may not be used // by enum values in the same enum declaration. Reserved ranges may not // overlap. repeated EnumReservedRange reserved_range = 4; // Reserved enum value names, which may not be reused. A given name may only // be reserved once. repeated string reserved_name = 5; } // Describes a value within an enum. message EnumValueDescriptorProto { optional string name = 1; optional int32 number = 2; optional EnumValueOptions options = 3; } // Describes a service. message ServiceDescriptorProto { optional string name = 1; repeated MethodDescriptorProto method = 2; optional ServiceOptions options = 3; } // Describes a method of a service. message MethodDescriptorProto { optional string name = 1; // Input and output type names. These are resolved in the same way as // FieldDescriptorProto.type_name, but must refer to a message type. optional string input_type = 2; optional string output_type = 3; optional MethodOptions options = 4; // Identifies if client streams multiple client messages optional bool client_streaming = 5 [default=false]; // Identifies if server streams multiple server messages optional bool server_streaming = 6 [default=false]; } // =================================================================== // Options // Each of the definitions above may have "options" attached. These are // just annotations which may cause code to be generated slightly differently // or may contain hints for code that manipulates protocol messages. // // Clients may define custom options as extensions of the *Options messages. // These extensions may not yet be known at parsing time, so the parser cannot // store the values in them. Instead it stores them in a field in the *Options // message called uninterpreted_option. This field must have the same name // across all *Options messages. We then use this field to populate the // extensions when we build a descriptor, at which point all protos have been // parsed and so all extensions are known. // // Extension numbers for custom options may be chosen as follows: // * For options which will only be used within a single application or // organization, or for experimental options, use field numbers 50000 // through 99999. It is up to you to ensure that you do not use the // same number for multiple options. // * For options which will be published and used publicly by multiple // independent entities, e-mail [email protected] // to reserve extension numbers. Simply provide your project name (e.g. // Objective-C plugin) and your project website (if available) -- there‘s no // need to explain how you intend to use them. Usually you only need one // extension number. You can declare multiple options with only one extension // number by putting them in a sub-message. See the Custom Options section of // the docs for examples: // https://developers.google.com/protocol-buffers/docs/proto#options // If this turns out to be popular, a web service will be set up // to automatically assign option numbers. message FileOptions { // Sets the Java package where classes generated from this .proto will be // placed. By default, the proto package is used, but this is often // inappropriate because proto packages do not normally start with backwards // domain names. optional string java_package = 1; // If set, all the classes from the .proto file are wrapped in a single // outer class with the given name. This applies to both Proto1 // (equivalent to the old "--one_java_file" option) and Proto2 (where // a .proto always translates to a single class, but you may want to // explicitly choose the class name). optional string java_outer_classname = 8; // If set true, then the Java code generator will generate a separate .java // file for each top-level message, enum, and service defined in the .proto // file. Thus, these types will *not* be nested inside the outer class // named by java_outer_classname. However, the outer class will still be // generated to contain the file‘s getDescriptor() method as well as any // top-level extensions defined in the file. optional bool java_multiple_files = 10 [default=false]; // This option does nothing. optional bool java_generate_equals_and_hash = 20 [deprecated=true]; // If set true, then the Java2 code generator will generate code that // throws an exception whenever an attempt is made to assign a non-UTF-8 // byte sequence to a string field. // Message reflection will do the same. // However, an extension field still accepts non-UTF-8 byte sequences. // This option has no effect on when used with the lite runtime. optional bool java_string_check_utf8 = 27 [default=false]; // Generated classes can be optimized for speed or code size. enum OptimizeMode { SPEED = 1; // Generate complete code for parsing, serialization, // etc. CODE_SIZE = 2; // Use ReflectionOps to implement these methods. LITE_RUNTIME = 3; // Generate code using MessageLite and the lite runtime. } optional OptimizeMode optimize_for = 9 [default=SPEED]; // Sets the Go package where structs generated from this .proto will be // placed. If omitted, the Go package will be derived from the following: // - The basename of the package import path, if provided. // - Otherwise, the package statement in the .proto file, if present. // - Otherwise, the basename of the .proto file, without extension. optional string go_package = 11; // Should generic services be generated in each language? "Generic" services // are not specific to any particular RPC system. They are generated by the // main code generators in each language (without additional plugins). // Generic services were the only kind of service generation supported by // early versions of google.protobuf. // // Generic services are now considered deprecated in favor of using plugins // that generate code specific to your particular RPC system. Therefore, // these default to false. Old code which depends on generic services should // explicitly set them to true. optional bool cc_generic_services = 16 [default=false]; optional bool java_generic_services = 17 [default=false]; optional bool py_generic_services = 18 [default=false]; optional bool php_generic_services = 42 [default=false]; // Is this file deprecated? // Depending on the target platform, this can emit Deprecated annotations // for everything in the file, or it will be completely ignored; in the very // least, this is a formalization for deprecating files. optional bool deprecated = 23 [default=false]; // Enables the use of arenas for the proto messages in this file. This applies // only to generated classes for C++. optional bool cc_enable_arenas = 31 [default=false]; // Sets the objective c class prefix which is prepended to all objective c // generated classes from this .proto. There is no default. optional string objc_class_prefix = 36; // Namespace for generated classes; defaults to the package. optional string csharp_namespace = 37; // By default Swift generators will take the proto package and CamelCase it // replacing ‘.‘ with underscore and use that to prefix the types/symbols // defined. When this options is provided, they will use this value instead // to prefix the types/symbols defined. optional string swift_prefix = 39; // Sets the php class prefix which is prepended to all php generated classes // from this .proto. Default is empty. optional string php_class_prefix = 40; // Use this option to change the namespace of php generated classes. Default // is empty. When this option is empty, the package name will be used for // determining the namespace. optional string php_namespace = 41; // Use this option to change the namespace of php generated metadata classes. // Default is empty. When this option is empty, the proto file name will be used // for determining the namespace. optional string php_metadata_namespace = 44; // Use this option to change the package of ruby generated classes. Default // is empty. When this option is not set, the package name will be used for // determining the ruby package. optional string ruby_package = 45; // The parser stores options it doesn‘t recognize here. // See the documentation for the "Options" section above. repeated UninterpretedOption uninterpreted_option = 999; // Clients can define custom options in extensions of this message. // See the documentation for the "Options" section above. extensions 1000 to max; reserved 38; } message MessageOptions { // Set true to use the old proto1 MessageSet wire format for extensions. // This is provided for backwards-compatibility with the MessageSet wire // format. You should not use this for any other reason: It‘s less // efficient, has fewer features, and is more complicated. // // The message must be defined exactly as follows: // message Foo { // option message_set_wire_format = true; // extensions 4 to max; // } // Note that the message cannot have any defined fields; MessageSets only // have extensions. // // All extensions of your type must be singular messages; e.g. they cannot // be int32s, enums, or repeated messages. // // Because this is an option, the above two restrictions are not enforced by // the protocol compiler. optional bool message_set_wire_format = 1 [default=false]; // Disables the generation of the standard "descriptor()" accessor, which can // conflict with a field of the same name. This is meant to make migration // from proto1 easier; new code should avoid fields named "descriptor". optional bool no_standard_descriptor_accessor = 2 [default=false]; // Is this message deprecated? // Depending on the target platform, this can emit Deprecated annotations // for the message, or it will be completely ignored; in the very least, // this is a formalization for deprecating messages. optional bool deprecated = 3 [default=false]; // Whether the message is an automatically generated map entry type for the // maps field. // // For maps fields: // map<KeyType, ValueType> map_field = 1; // The parsed descriptor looks like: // message MapFieldEntry { // option map_entry = true; // optional KeyType key = 1; // optional ValueType value = 2; // } // repeated MapFieldEntry map_field = 1; // // Implementations may choose not to generate the map_entry=true message, but // use a native map in the target language to hold the keys and values. // The reflection APIs in such implementions still need to work as // if the field is a repeated message field. // // NOTE: Do not set the option in .proto files. Always use the maps syntax // instead. The option should only be implicitly set by the proto compiler // parser. optional bool map_entry = 7; reserved 8; // javalite_serializable reserved 9; // javanano_as_lite // The parser stores options it doesn‘t recognize here. See above. repeated UninterpretedOption uninterpreted_option = 999; // Clients can define custom options in extensions of this message. See above. extensions 1000 to max; } message FieldOptions { // The ctype option instructs the C++ code generator to use a different // representation of the field than it normally would. See the specific // options below. This option is not yet implemented in the open source // release -- sorry, we‘ll try to include it in a future version! optional CType ctype = 1 [default = STRING]; enum CType { // Default mode. STRING = 0; CORD = 1; STRING_PIECE = 2; } // The packed option can be enabled for repeated primitive fields to enable // a more efficient representation on the wire. Rather than repeatedly // writing the tag and type for each element, the entire array is encoded as // a single length-delimited blob. In proto3, only explicit setting it to // false will avoid using packed encoding. optional bool packed = 2; // The jstype option determines the javascript type used for values of the // field. The option is permitted only for 64 bit integral and fixed types // (int64, uint64, sint64, fixed64, sfixed64). A field with jstype JS_STRING // is represented as JavaScript string, which avoids loss of precision that // can happen when a large value is converted to a floating point JavaScript. // Specifying JS_NUMBER for the jstype causes the generated JavaScript code to // use the JavaScript "number" type. The behavior of the default option // JS_NORMAL is implementation dependent. // // This option is an enum to permit additional types to be added, e.g. // goog.math.Integer. optional JSType jstype = 6 [default = JS_NORMAL]; enum JSType { // Use the default type. JS_NORMAL = 0; // Use JavaScript strings. JS_STRING = 1; // Use JavaScript numbers. JS_NUMBER = 2; } // Should this field be parsed lazily? Lazy applies only to message-type // fields. It means that when the outer message is initially parsed, the // inner message‘s contents will not be parsed but instead stored in encoded // form. The inner message will actually be parsed when it is first accessed. // // This is only a hint. Implementations are free to choose whether to use // eager or lazy parsing regardless of the value of this option. However, // setting this option true suggests that the protocol author believes that // using lazy parsing on this field is worth the additional bookkeeping // overhead typically needed to implement it. // // This option does not affect the public interface of any generated code; // all method signatures remain the same. Furthermore, thread-safety of the // interface is not affected by this option; const methods remain safe to // call from multiple threads concurrently, while non-const methods continue // to require exclusive access. // // // Note that implementations may choose not to check required fields within // a lazy sub-message. That is, calling IsInitialized() on the outer message // may return true even if the inner message has missing required fields. // This is necessary because otherwise the inner message would have to be // parsed in order to perform the check, defeating the purpose of lazy // parsing. An implementation which chooses not to check required fields // must be consistent about it. That is, for any particular sub-message, the // implementation must either *always* check its required fields, or *never* // check its required fields, regardless of whether or not the message has // been parsed. optional bool lazy = 5 [default=false]; // Is this field deprecated? // Depending on the target platform, this can emit Deprecated annotations // for accessors, or it will be completely ignored; in the very least, this // is a formalization for deprecating fields. optional bool deprecated = 3 [default=false]; // For Google-internal migration only. Do not use. optional bool weak = 10 [default=false]; // The parser stores options it doesn‘t recognize here. See above. repeated UninterpretedOption uninterpreted_option = 999; // Clients can define custom options in extensions of this message. See above. extensions 1000 to max; reserved 4; // removed jtype } message OneofOptions { // The parser stores options it doesn‘t recognize here. See above. repeated UninterpretedOption uninterpreted_option = 999; // Clients can define custom options in extensions of this message. See above. extensions 1000 to max; } message EnumOptions { // Set this option to true to allow mapping different tag names to the same // value. optional bool allow_alias = 2; // Is this enum deprecated? // Depending on the target platform, this can emit Deprecated annotations // for the enum, or it will be completely ignored; in the very least, this // is a formalization for deprecating enums. optional bool deprecated = 3 [default=false]; reserved 5; // javanano_as_lite // The parser stores options it doesn‘t recognize here. See above. repeated UninterpretedOption uninterpreted_option = 999; // Clients can define custom options in extensions of this message. See above. extensions 1000 to max; } message EnumValueOptions { // Is this enum value deprecated? // Depending on the target platform, this can emit Deprecated annotations // for the enum value, or it will be completely ignored; in the very least, // this is a formalization for deprecating enum values. optional bool deprecated = 1 [default=false]; // The parser stores options it doesn‘t recognize here. See above. repeated UninterpretedOption uninterpreted_option = 999; // Clients can define custom options in extensions of this message. See above. extensions 1000 to max; } message ServiceOptions { // Note: Field numbers 1 through 32 are reserved for Google‘s internal RPC // framework. We apologize for hoarding these numbers to ourselves, but // we were already using them long before we decided to release Protocol // Buffers. // Is this service deprecated? // Depending on the target platform, this can emit Deprecated annotations // for the service, or it will be completely ignored; in the very least, // this is a formalization for deprecating services. optional bool deprecated = 33 [default=false]; // The parser stores options it doesn‘t recognize here. See above. repeated UninterpretedOption uninterpreted_option = 999; // Clients can define custom options in extensions of this message. See above. extensions 1000 to max; } message MethodOptions { // Note: Field numbers 1 through 32 are reserved for Google‘s internal RPC // framework. We apologize for hoarding these numbers to ourselves, but // we were already using them long before we decided to release Protocol // Buffers. // Is this method deprecated? // Depending on the target platform, this can emit Deprecated annotations // for the method, or it will be completely ignored; in the very least, // this is a formalization for deprecating methods. optional bool deprecated = 33 [default=false]; // Is this method side-effect-free (or safe in HTTP parlance), or idempotent, // or neither? HTTP based RPC implementation may choose GET verb for safe // methods, and PUT verb for idempotent methods instead of the default POST. enum IdempotencyLevel { IDEMPOTENCY_UNKNOWN = 0; NO_SIDE_EFFECTS = 1; // implies idempotent IDEMPOTENT = 2; // idempotent, but may have side effects } optional IdempotencyLevel idempotency_level = 34 [default=IDEMPOTENCY_UNKNOWN]; // The parser stores options it doesn‘t recognize here. See above. repeated UninterpretedOption uninterpreted_option = 999; // Clients can define custom options in extensions of this message. See above. extensions 1000 to max; } // A message representing a option the parser does not recognize. This only // appears in options protos created by the compiler::Parser class. // DescriptorPool resolves these when building Descriptor objects. Therefore, // options protos in descriptor objects (e.g. returned by Descriptor::options(), // or produced by Descriptor::CopyTo()) will never have UninterpretedOptions // in them. message UninterpretedOption { // The name of the uninterpreted option. Each string represents a segment in // a dot-separated name. is_extension is true iff a segment represents an // extension (denoted with parentheses in options specs in .proto files). // E.g.,{ ["foo", false], ["bar.baz", true], ["qux", false] } represents // "foo.(bar.baz).qux". message NamePart { required string name_part = 1; required bool is_extension = 2; } repeated NamePart name = 2; // The value of the uninterpreted option, in whatever type the tokenizer // identified it as during parsing. Exactly one of these should be set. optional string identifier_value = 3; optional uint64 positive_int_value = 4; optional int64 negative_int_value = 5; optional double double_value = 6; optional bytes string_value = 7; optional string aggregate_value = 8; } // =================================================================== // Optional source code info // Encapsulates information about the original source file from which a // FileDescriptorProto was generated. message SourceCodeInfo { // A Location identifies a piece of source code in a .proto file which // corresponds to a particular definition. This information is intended // to be useful to IDEs, code indexers, documentation generators, and similar // tools. // // For example, say we have a file like: // message Foo { // optional string foo = 1; // } // Let‘s look at just the field definition: // optional string foo = 1; // ^ ^^ ^^ ^ ^^^ // a bc de f ghi // We have the following locations: // span path represents // [a,i) [ 4, 0, 2, 0 ] The whole field definition. // [a,b) [ 4, 0, 2, 0, 4 ] The label (optional). // [c,d) [ 4, 0, 2, 0, 5 ] The type (string). // [e,f) [ 4, 0, 2, 0, 1 ] The name (foo). // [g,h) [ 4, 0, 2, 0, 3 ] The number (1). // // Notes: // - A location may refer to a repeated field itself (i.e. not to any // particular index within it). This is used whenever a set of elements are // logically enclosed in a single code segment. For example, an entire // extend block (possibly containing multiple extension definitions) will // have an outer location whose path refers to the "extensions" repeated // field without an index. // - Multiple locations may have the same path. This happens when a single // logical declaration is spread out across multiple places. The most // obvious example is the "extend" block again -- there may be multiple // extend blocks in the same scope, each of which will have the same path. // - A location‘s span is not always a subset of its parent‘s span. For // example, the "extendee" of an extension declaration appears at the // beginning of the "extend" block and is shared by all extensions within // the block. // - Just because a location‘s span is a subset of some other location‘s span // does not mean that it is a descendent. For example, a "group" defines // both a type and a field in a single declaration. Thus, the locations // corresponding to the type and field and their components will overlap. // - Code which tries to interpret locations should probably be designed to // ignore those that it doesn‘t understand, as more types of locations could // be recorded in the future. repeated Location location = 1; message Location { // Identifies which part of the FileDescriptorProto was defined at this // location. // // Each element is a field number or an index. They form a path from // the root FileDescriptorProto to the place where the definition. For // example, this path: // [ 4, 3, 2, 7, 1 ] // refers to: // file.message_type(3) // 4, 3 // .field(7) // 2, 7 // .name() // 1 // This is because FileDescriptorProto.message_type has field number 4: // repeated DescriptorProto message_type = 4; // and DescriptorProto.field has field number 2: // repeated FieldDescriptorProto field = 2; // and FieldDescriptorProto.name has field number 1: // optional string name = 1; // // Thus, the above path gives the location of a field name. If we removed // the last element: // [ 4, 3, 2, 7 ] // this path refers to the whole field declaration (from the beginning // of the label to the terminating semicolon). repeated int32 path = 1 [packed=true]; // Always has exactly three or four elements: start line, start column, // end line (optional, otherwise assumed same as start line), end column. // These are packed into a single field for efficiency. Note that line // and column numbers are zero-based -- typically you will want to add // 1 to each before displaying to a user. repeated int32 span = 2 [packed=true]; // If this SourceCodeInfo represents a complete declaration, these are any // comments appearing before and after the declaration which appear to be // attached to the declaration. // // A series of line comments appearing on consecutive lines, with no other // tokens appearing on those lines, will be treated as a single comment. // // leading_detached_comments will keep paragraphs of comments that appear // before (but not connected to) the current element. Each paragraph, // separated by empty lines, will be one comment element in the repeated // field. // // Only the comment content is provided; comment markers (e.g. //) are // stripped out. For block comments, leading whitespace and an asterisk // will be stripped from the beginning of each line other than the first. // Newlines are included in the output. // // Examples: // // optional int32 foo = 1; // Comment attached to foo. // // Comment attached to bar. // optional int32 bar = 2; // // optional string baz = 3; // // Comment attached to baz. // // Another line attached to baz. // // // Comment attached to qux. // // // // Another line attached to qux. // optional double qux = 4; // // // Detached comment for corge. This is not leading or trailing comments // // to qux or corge because there are blank lines separating it from // // both. // // // Detached comment for corge paragraph 2. // // optional string corge = 5; // /* Block comment attached // * to corge. Leading asterisks // * will be removed. */ // /* Block comment attached to // * grault. */ // optional int32 grault = 6; // // // ignored detached comments. optional string leading_comments = 3; optional string trailing_comments = 4; repeated string leading_detached_comments = 6; } } // Describes the relationship between generated code and its original source // file. A GeneratedCodeInfo message is associated with only one generated // source file, but may contain references to different source .proto files. message GeneratedCodeInfo { // An Annotation connects some span of text in generated code to an element // of its generating .proto file. repeated Annotation annotation = 1; message Annotation { // Identifies the element in the original source .proto file. This field // is formatted the same as SourceCodeInfo.Location.path. repeated int32 path = 1 [packed=true]; // Identifies the filesystem path to the original source .proto. optional string source_file = 2; // Identifies the starting offset in bytes in the generated code // that relates to the identified object. optional int32 begin = 3; // Identifies the ending offset in bytes in the generated code that // relates to the identified offset. The end offset should be one past // the last relevant byte (so the length of the text = end - begin). optional int32 end = 4; } }
google/protobuf/any.proto
// Protocol Buffers - Google‘s data interchange format // Copyright 2008 Google Inc. All rights reserved. // https://developers.google.com/protocol-buffers/ // // Redistribution and use in source and binary forms, with or without // modification, are permitted provided that the following conditions are // met: // // * Redistributions of source code must retain the above copyright // notice, this list of conditions and the following disclaimer. // * Redistributions in binary form must reproduce the above // copyright notice, this list of conditions and the following disclaimer // in the documentation and/or other materials provided with the // distribution. // * Neither the name of Google Inc. nor the names of its // contributors may be used to endorse or promote products derived from // this software without specific prior written permission. // // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. syntax = "proto3"; package google.protobuf; option csharp_namespace = "Google.Protobuf.WellKnownTypes"; option go_package = "github.com/golang/protobuf/ptypes/any"; option java_package = "com.google.protobuf"; option java_outer_classname = "AnyProto"; option java_multiple_files = true; option objc_class_prefix = "GPB"; // `Any` contains an arbitrary serialized protocol buffer message along with a // URL that describes the type of the serialized message. // // Protobuf library provides support to pack/unpack Any values in the form // of utility functions or additional generated methods of the Any type. // // Example 1: Pack and unpack a message in C++. // // Foo foo = ...; // Any any; // any.PackFrom(foo); // ... // if (any.UnpackTo(&foo)) { // ... // } // // Example 2: Pack and unpack a message in Java. // // Foo foo = ...; // Any any = Any.pack(foo); // ... // if (any.is(Foo.class)) { // foo = any.unpack(Foo.class); // } // // Example 3: Pack and unpack a message in Python. // // foo = Foo(...) // any = Any() // any.Pack(foo) // ... // if any.Is(Foo.DESCRIPTOR): // any.Unpack(foo) // ... // // Example 4: Pack and unpack a message in Go // // foo := &pb.Foo{...} // any, err := ptypes.MarshalAny(foo) // ... // foo := &pb.Foo{} // if err := ptypes.UnmarshalAny(any, foo); err != nil { // ... // } // // The pack methods provided by protobuf library will by default use // ‘type.googleapis.com/full.type.name‘ as the type URL and the unpack // methods only use the fully qualified type name after the last ‘/‘ // in the type URL, for example "foo.bar.com/x/y.z" will yield type // name "y.z". // // // JSON // ==== // The JSON representation of an `Any` value uses the regular // representation of the deserialized, embedded message, with an // additional field `@type` which contains the type URL. Example: // // package google.profile; // message Person { // string first_name = 1; // string last_name = 2; // } // // { // "@type": "type.googleapis.com/google.profile.Person", // "firstName": <string>, // "lastName": <string> // } // // If the embedded message type is well-known and has a custom JSON // representation, that representation will be embedded adding a field // `value` which holds the custom JSON in addition to the `@type` // field. Example (for message [google.protobuf.Duration][]): // // { // "@type": "type.googleapis.com/google.protobuf.Duration", // "value": "1.212s" // } // message Any { // A URL/resource name that uniquely identifies the type of the serialized // protocol buffer message. The last segment of the URL‘s path must represent // the fully qualified name of the type (as in // `path/google.protobuf.Duration`). The name should be in a canonical form // (e.g., leading "." is not accepted). // // In practice, teams usually precompile into the binary all types that they // expect it to use in the context of Any. However, for URLs which use the // scheme `http`, `https`, or no scheme, one can optionally set up a type // server that maps type URLs to message definitions as follows: // // * If no scheme is provided, `https` is assumed. // * An HTTP GET on the URL must yield a [google.protobuf.Type][] // value in binary format, or produce an error. // * Applications are allowed to cache lookup results based on the // URL, or have them precompiled into a binary to avoid any // lookup. Therefore, binary compatibility needs to be preserved // on changes to types. (Use versioned type names to manage // breaking changes.) // // Note: this functionality is not currently available in the official // protobuf release, and it is not used for type URLs beginning with // type.googleapis.com. // // Schemes other than `http`, `https` (or the empty scheme) might be // used with implementation specific semantics. // string type_url = 1; // Must be a valid serialized protocol buffer of the above specified type. bytes value = 2; }
希望能够帮到一些遇到这个问题的朋友，毕竟网上国内外关于这些gRPC的小问题的资料比较少。
请保留原文链接：https://www.cnblogs.com/x-poior/p/9266087.html
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