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github.com/solo-io/solo-kit/api/external/google/protobuf/descriptor.proto

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DescriptorProto

Describes a message type.

Field Type Label Description
name string optional
field []FieldDescriptorProto repeated
extension []FieldDescriptorProto repeated
nested_type []DescriptorProto repeated
enum_type []EnumDescriptorProto repeated
extension_range []DescriptorProto.ExtensionRange repeated
oneof_decl []OneofDescriptorProto repeated
options MessageOptions optional
reserved_range []DescriptorProto.ReservedRange repeated
reserved_name []string repeated Reserved field names, which may not be used by fields in the same message.
A given name may only be reserved once.

DescriptorProto.ExtensionRange

Field Type Label Description
start int32 optional
end int32 optional

DescriptorProto.ReservedRange

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.

Field Type Label Description
start int32 optional Inclusive.
end int32 optional Exclusive.

EnumDescriptorProto

Describes an enum type.

Field Type Label Description
name string optional
value []EnumValueDescriptorProto repeated
options EnumOptions optional

EnumOptions

Field Type Label Description
allow_alias bool optional Set this option to true to allow mapping different tag names to the same
value.
deprecated bool optional 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. Default: false
uninterpreted_option []UninterpretedOption repeated The parser stores options it doesn't recognize here. See above.

EnumValueDescriptorProto

Describes a value within an enum.

Field Type Label Description
name string optional
number int32 optional
options EnumValueOptions optional

EnumValueOptions

Field Type Label Description
deprecated bool optional 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. Default: false
uninterpreted_option []UninterpretedOption repeated The parser stores options it doesn't recognize here. See above.

FieldDescriptorProto

Describes a field within a message.

Field Type Label Description
name string optional
number int32 optional
label FieldDescriptorProto.Label optional
type FieldDescriptorProto.Type optional 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.
type_name string optional 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).
extendee string optional For extensions, this is the name of the type being extended. It is
resolved in the same manner as type_name.
default_value string optional 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?
oneof_index int32 optional If set, gives the index of a oneof in the containing type's oneof_decl
list. This field is a member of that oneof.
json_name string optional 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.
options FieldOptions optional

FieldOptions

Field Type Label Description
ctype FieldOptions.CType optional 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! Default: STRING
packed bool optional 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.
jstype FieldOptions.JSType optional 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). By default these types are
represented as JavaScript strings. This avoids loss of precision that can
happen when a large value is converted to a floating point JavaScript
numbers. Specifying JS_NUMBER for the jstype causes the generated
JavaScript code to use the JavaScript "number" type instead of strings.
This option is an enum to permit additional types to be added,
e.g. goog.math.Integer. Default: JS_NORMAL
lazy bool optional 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. Default: false | | deprecated | bool | optional | 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. Default: false | | weak | bool | optional | For Google-internal migration only. Do not use. Default: false | | uninterpreted_option | []UninterpretedOption | repeated | The parser stores options it doesn't recognize here. See above. |

FileDescriptorProto

Describes a complete .proto file.

Field Type Label Description
name string optional file name, relative to root of source tree
package string optional e.g. "foo", "foo.bar", etc.
dependency []string repeated Names of files imported by this file.
public_dependency []int32 repeated Indexes of the public imported files in the dependency list above.
weak_dependency []int32 repeated Indexes of the weak imported files in the dependency list.
For Google-internal migration only. Do not use.
message_type []DescriptorProto repeated All top-level definitions in this file.
enum_type []EnumDescriptorProto repeated
service []ServiceDescriptorProto repeated
extension []FieldDescriptorProto repeated
options FileOptions optional
source_code_info SourceCodeInfo optional 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.
syntax string optional The syntax of the proto file.
The supported values are "proto2" and "proto3".

FileDescriptorSet

The protocol compiler can output a FileDescriptorSet containing the .proto files it parses.

Field Type Label Description
file []FileDescriptorProto repeated

FileOptions

Field Type Label Description
java_package string optional 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.
java_outer_classname string optional 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).
java_multiple_files bool optional 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. Default: false
java_generate_equals_and_hash bool optional This option does nothing.
java_string_check_utf8 bool optional 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. Default: false
optimize_for FileOptions.OptimizeMode optional Default: SPEED
go_package string optional Sets the Go package where structs generated from this .proto will be
placed. If omitted, the Go package will be derived from the following:

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. Default: false | | java_generic_services | bool | optional | Default: false | | py_generic_services | bool | optional | Default: false | | deprecated | bool | optional | 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. Default: false | | cc_enable_arenas | bool | optional | Enables the use of arenas for the proto messages in this file. This applies only to generated classes for C++. Default: false | | objc_class_prefix | string | optional | Sets the objective c class prefix which is prepended to all objective c generated classes from this .proto. There is no default. | | csharp_namespace | string | optional | Namespace for generated classes; defaults to the package. | | swift_prefix | string | optional | 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. | | php_class_prefix | string | optional | Sets the php class prefix which is prepended to all php generated classes from this .proto. Default is empty. | | uninterpreted_option | []UninterpretedOption | repeated | The parser stores options it doesn't recognize here. See above. |

GeneratedCodeInfo

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.

Field Type Label Description
annotation []GeneratedCodeInfo.Annotation repeated An Annotation connects some span of text in generated code to an element
of its generating .proto file.

GeneratedCodeInfo.Annotation

Field Type Label Description
path []int32 repeated Identifies the element in the original source .proto file. This field
is formatted the same as SourceCodeInfo.Location.path.
source_file string optional Identifies the filesystem path to the original source .proto.
begin int32 optional Identifies the starting offset in bytes in the generated code
that relates to the identified object.
end int32 optional 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).

MessageOptions

Field Type Label Description
message_set_wire_format bool optional 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. Default: false | | no_standard_descriptor_accessor | bool | optional | 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". Default: false | | deprecated | bool | optional | 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. Default: false | | map_entry | bool | optional | 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. | | uninterpreted_option | []UninterpretedOption | repeated | The parser stores options it doesn't recognize here. See above. |

MethodDescriptorProto

Describes a method of a service.

Field Type Label Description
name string optional
input_type string optional Input and output type names. These are resolved in the same way as
FieldDescriptorProto.type_name, but must refer to a message type.
output_type string optional
options MethodOptions optional
client_streaming bool optional Identifies if client streams multiple client messages Default: false
server_streaming bool optional Identifies if server streams multiple server messages Default: false

MethodOptions

Field Type Label Description
deprecated bool optional 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. Default: false
idempotency_level MethodOptions.IdempotencyLevel optional Default: IDEMPOTENCY_UNKNOWN
uninterpreted_option []UninterpretedOption repeated The parser stores options it doesn't recognize here. See above.

OneofDescriptorProto

Describes a oneof.

Field Type Label Description
name string optional
options OneofOptions optional

OneofOptions

Field Type Label Description
uninterpreted_option []UninterpretedOption repeated The parser stores options it doesn't recognize here. See above.

ServiceDescriptorProto

Describes a service.

Field Type Label Description
name string optional
method []MethodDescriptorProto repeated
options ServiceOptions optional

ServiceOptions

Field Type Label Description
deprecated bool optional 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. Default: false
uninterpreted_option []UninterpretedOption repeated The parser stores options it doesn't recognize here. See above.

SourceCodeInfo

Encapsulates information about the original source file from which a FileDescriptorProto was generated.

Field Type Label Description
location []SourceCodeInfo.Location repeated 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:

SourceCodeInfo.Location

Field Type Label Description
path []int32 repeated 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). | | span | []int32 | repeated | 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. | | leading_comments | string | optional | 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

// ignored detached comments. | | trailing_comments | string | optional | | | leading_detached_comments | []string | repeated | |

UninterpretedOption

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.

Field Type Label Description
name []UninterpretedOption.NamePart repeated
identifier_value string optional The value of the uninterpreted option, in whatever type the tokenizer
identified it as during parsing. Exactly one of these should be set.
positive_int_value uint64 optional
negative_int_value int64 optional
double_value double optional
string_value bytes optional
aggregate_value string optional

UninterpretedOption.NamePart

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".

Field Type Label Description
name_part string required
is_extension bool required

FieldDescriptorProto.Label

Name Number Description
LABEL_OPTIONAL 1 0 is reserved for errors
LABEL_REQUIRED 2
LABEL_REPEATED 3

FieldDescriptorProto.Type

Name Number Description
TYPE_DOUBLE 1 0 is reserved for errors.
Order is weird for historical reasons.
TYPE_FLOAT 2
TYPE_INT64 3 Not ZigZag encoded. Negative numbers take 10 bytes. Use TYPE_SINT64 if
negative values are likely.
TYPE_UINT64 4
TYPE_INT32 5 Not ZigZag encoded. Negative numbers take 10 bytes. Use TYPE_SINT32 if
negative values are likely.
TYPE_FIXED64 6
TYPE_FIXED32 7
TYPE_BOOL 8
TYPE_STRING 9
TYPE_GROUP 10 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_MESSAGE 11 Length-delimited aggregate.
TYPE_BYTES 12 New in version 2.
TYPE_UINT32 13
TYPE_ENUM 14
TYPE_SFIXED32 15
TYPE_SFIXED64 16
TYPE_SINT32 17 Uses ZigZag encoding.
TYPE_SINT64 18 Uses ZigZag encoding.

FieldOptions.CType

Name Number Description
STRING 0 Default mode.
CORD 1
STRING_PIECE 2

FieldOptions.JSType

Name Number Description
JS_NORMAL 0 Use the default type.
JS_STRING 1 Use JavaScript strings.
JS_NUMBER 2 Use JavaScript numbers.

FileOptions.OptimizeMode

Generated classes can be optimized for speed or code size.

Name Number Description
SPEED 1 Generate complete code for parsing, serialization,
CODE_SIZE 2 etc.

Use ReflectionOps to implement these methods. | | LITE_RUNTIME | 3 | Generate code using MessageLite and the lite runtime. |

MethodOptions.IdempotencyLevel

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.

Name Number Description
IDEMPOTENCY_UNKNOWN 0
NO_SIDE_EFFECTS 1 implies idempotent
IDEMPOTENT 2 idempotent, but may have side effects