【gRPC使用问题1】gRPC的proto内import其他proto导致的一次小坑

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: kenton@google.com (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 = ;
}

// Describes a complete .proto file.
message FileDescriptorProto {
  optional string name = ;       // file name, relative to root of source tree
  optional string package = ;    // e.g. "foo", "foo.bar", etc.

  // Names of files imported by this file.
  repeated string dependency = ;
  // Indexes of the public imported files in the dependency list above.
  repeated int32 public_dependency = ;
  // Indexes of the weak imported files in the dependency list.
  // For Google-internal migration only. Do not use.
  repeated int32 weak_dependency = ;

  // All top-level definitions in this file.
  repeated DescriptorProto message_type = ;
  repeated EnumDescriptorProto enum_type = ;
  repeated ServiceDescriptorProto service = ;
  repeated FieldDescriptorProto extension = ;

  optional FileOptions options = ;

  // 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 = ;

  // The syntax of the proto file.
  // The supported values are "proto2" and "proto3".
  optional string syntax = ;
}

// Describes a message type.
message DescriptorProto {
  optional string name = ;

  repeated FieldDescriptorProto field = ;
  repeated FieldDescriptorProto extension = ;

  repeated DescriptorProto nested_type = ;
  repeated EnumDescriptorProto enum_type = ;

  message ExtensionRange {
    optional int32 start = ;
    optional int32 end = ;

    optional ExtensionRangeOptions options = ;
  }
  repeated ExtensionRange extension_range = ;

  repeated OneofDescriptorProto oneof_decl = ;

  optional MessageOptions options = ;

  // 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 = ; // Inclusive.
    optional int32 end = ;   // Exclusive.
  }
  repeated ReservedRange reserved_range = ;
  // 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 = ;
}

message ExtensionRangeOptions {
  // The parser stores options it doesn't recognize here. See above.
  repeated UninterpretedOption uninterpreted_option = ;

  // Clients can define custom options in extensions of this message. See above.
  extensions  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         = ;
    TYPE_FLOAT          = ;
    // Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT64 if
    // negative values are likely.
    TYPE_INT64          = ;
    TYPE_UINT64         = ;
    // Not ZigZag encoded.  Negative numbers take 10 bytes.  Use TYPE_SINT32 if
    // negative values are likely.
    TYPE_INT32          = ;
    TYPE_FIXED64        = ;
    TYPE_FIXED32        = ;
    TYPE_BOOL           = ;
    TYPE_STRING         = ;
    // 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          = ;
    TYPE_MESSAGE        = ;  // Length-delimited aggregate.

    // New in version 2.
    TYPE_BYTES          = ;
    TYPE_UINT32         = ;
    TYPE_ENUM           = ;
    TYPE_SFIXED32       = ;
    TYPE_SFIXED64       = ;
    TYPE_SINT32         = ;  // Uses ZigZag encoding.
    TYPE_SINT64         = ;  // Uses ZigZag encoding.
  };

  enum Label {
    // 0 is reserved for errors
    LABEL_OPTIONAL      = ;
    LABEL_REQUIRED      = ;
    LABEL_REPEATED      = ;
  };

  optional string name = ;
  optional int32 number = ;
  optional Label label = ;

  // 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 = ;

  // 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 = ;

  // For extensions, this is the name of the type being extended.  It is
  // resolved in the same manner as type_name.
  optional string extendee = ;

  // 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 = ;

  // 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 = ;

  // 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 = ;

  optional FieldOptions options = ;
}

// Describes a oneof.
message OneofDescriptorProto {
  optional string name = ;
  optional OneofOptions options = ;
}

// Describes an enum type.
message EnumDescriptorProto {
  optional string name = ;

  repeated EnumValueDescriptorProto value = ;

  optional EnumOptions options = ;

  // 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 = ; // Inclusive.
    optional int32 end = ;   // 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 = ;

  // Reserved enum value names, which may not be reused. A given name may only
  // be reserved once.
  repeated string reserved_name = ;
}

// Describes a value within an enum.
message EnumValueDescriptorProto {
  optional string name = ;
  optional int32 number = ;

  optional EnumValueOptions options = ;
}

// Describes a service.
message ServiceDescriptorProto {
  optional string name = ;
  repeated MethodDescriptorProto method = ;

  optional ServiceOptions options = ;
}

// Describes a method of a service.
message MethodDescriptorProto {
  optional string name = ;

  // 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 = ;
  optional string output_type = ;

  optional MethodOptions options = ;

  // Identifies if client streams multiple client messages
  optional bool client_streaming =  [default=false];
  // Identifies if server streams multiple server messages
  optional bool server_streaming =  [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 protobuf-global-extension-registry@google.com
//   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 = ;

  // 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 = ;

  // 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 =  [default=false];

  // This option does nothing.
  optional bool java_generate_equals_and_hash =  [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 =  [default=false];

  // Generated classes can be optimized for speed or code size.
  enum OptimizeMode {
    SPEED = ;        // Generate complete code for parsing, serialization,
                      // etc.
    CODE_SIZE = ;    // Use ReflectionOps to implement these methods.
    LITE_RUNTIME = ; // Generate code using MessageLite and the lite runtime.
  }
  optional OptimizeMode optimize_for =  [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 = ;

  // 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 =  [default=false];
  optional bool java_generic_services =  [default=false];
  optional bool py_generic_services =  [default=false];
  optional bool php_generic_services =  [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 =  [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 =  [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 = ;

  // Namespace for generated classes; defaults to the package.
  optional string csharp_namespace = ;

  // 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 = ;

  // Sets the php class prefix which is prepended to all php generated classes
  // from this .proto. Default is empty.
  optional string php_class_prefix = ;

  // 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 = ;

  // 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 = ;

  // 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 = ;

  // The parser stores options it doesn't recognize here.
  // See the documentation for the "Options" section above.
  repeated UninterpretedOption uninterpreted_option = ;

  // Clients can define custom options in extensions of this message.
  // See the documentation for the "Options" section above.
  extensions  to max;

  reserved ;
}

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 =  [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 =  [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 =  [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 = ;

  reserved ;  // javalite_serializable
  reserved ;  // javanano_as_lite

  // The parser stores options it doesn't recognize here. See above.
  repeated UninterpretedOption uninterpreted_option = ;

  // Clients can define custom options in extensions of this message. See above.
  extensions  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 =  [default = STRING];
  enum CType {
    // Default mode.
    STRING = ;

    CORD = ;

    STRING_PIECE = ;
  }
  // 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 = ;

  // 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 =  [default = JS_NORMAL];
  enum JSType {
    // Use the default type.
    JS_NORMAL = ;

    // Use JavaScript strings.
    JS_STRING = ;

    // Use JavaScript numbers.
    JS_NUMBER = ;
  }

  // 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 =  [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 =  [default=false];

  // For Google-internal migration only. Do not use.
  optional bool weak =  [default=false];

  // The parser stores options it doesn't recognize here. See above.
  repeated UninterpretedOption uninterpreted_option = ;

  // Clients can define custom options in extensions of this message. See above.
  extensions  to max;

  reserved ;  // removed jtype
}

message OneofOptions {
  // The parser stores options it doesn't recognize here. See above.
  repeated UninterpretedOption uninterpreted_option = ;

  // Clients can define custom options in extensions of this message. See above.
  extensions  to max;
}

message EnumOptions {

  // Set this option to true to allow mapping different tag names to the same
  // value.
  optional bool allow_alias = ;

  // 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 =  [default=false];

  reserved ;  // javanano_as_lite

  // The parser stores options it doesn't recognize here. See above.
  repeated UninterpretedOption uninterpreted_option = ;

  // Clients can define custom options in extensions of this message. See above.
  extensions  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 =  [default=false];

  // The parser stores options it doesn't recognize here. See above.
  repeated UninterpretedOption uninterpreted_option = ;

  // Clients can define custom options in extensions of this message. See above.
  extensions  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 =  [default=false];

  // The parser stores options it doesn't recognize here. See above.
  repeated UninterpretedOption uninterpreted_option = ;

  // Clients can define custom options in extensions of this message. See above.
  extensions  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 =  [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 = ;
    NO_SIDE_EFFECTS     = ; // implies idempotent
    IDEMPOTENT          = ; // idempotent, but may have side effects
  }
  optional IdempotencyLevel idempotency_level =
       [default=IDEMPOTENCY_UNKNOWN];

  // The parser stores options it doesn't recognize here. See above.
  repeated UninterpretedOption uninterpreted_option = ;

  // Clients can define custom options in extensions of this message. See above.
  extensions  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 = ;
    required bool is_extension = ;
  }
  repeated NamePart name = ;

  // 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 = ;
  optional uint64 positive_int_value = ;
  optional int64 negative_int_value = ;
  optional double double_value = ;
  optional bytes string_value = ;
  optional string aggregate_value = ;
}

// ===================================================================
// 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 = ;
  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 =  [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 =  [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 = ;
    optional string trailing_comments = ;
    repeated string leading_detached_comments = ;
  }
}

// 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 = ;
  message Annotation {
    // Identifies the element in the original source .proto file. This field
    // is formatted the same as SourceCodeInfo.Location.path.
    repeated int32 path =  [packed=true];

    // Identifies the filesystem path to the original source .proto.
    optional string source_file = ;

    // Identifies the starting offset in bytes in the generated code
    // that relates to the identified object.
    optional int32 begin = ;

    // 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 = ;
  }
}

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 = ;

  // Must be a valid serialized protocol buffer of the above specified type.
  bytes value = ;
}

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