internal/protobuf: add proto definition extraction
Change-Id: Ia356bcb951e30bcc8030b51cbc5d9949391e84dc
Reviewed-on: https://cue-review.googlesource.com/c/cue/+/1980
Reviewed-by: Marcel van Lohuizen <mpvl@google.com>
diff --git a/internal/protobuf/testdata/attributes.proto.out.cue b/internal/protobuf/testdata/attributes.proto.out.cue
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+
+// Copyright 2016 Istio Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+package v1
+
+import "time"
+
+// Attributes represents a set of typed name/value pairs. Many of Mixer's
+// API either consume and/or return attributes.
+//
+// Istio uses attributes to control the runtime behavior of services running in the service mesh.
+// Attributes are named and typed pieces of metadata describing ingress and egress traffic and the
+// environment this traffic occurs in. An Istio attribute carries a specific piece
+// of information such as the error code of an API request, the latency of an API request, or the
+// original IP address of a TCP connection. For example:
+//
+// ```yaml
+// request.path: xyz/abc
+// request.size: 234
+// request.time: 12:34:56.789 04/17/2017
+// source.ip: 192.168.0.1
+// target.service: example
+// ```
+//
+// A given Istio deployment has a fixed vocabulary of attributes that it understands.
+// The specific vocabulary is determined by the set of attribute producers being used
+// in the deployment. The primary attribute producer in Istio is Envoy, although
+// specialized Mixer adapters and services can also generate attributes.
+//
+// The common baseline set of attributes available in most Istio deployments is defined
+// [here](https://istio.io/docs/reference/config/policy-and-telemetry/attribute-vocabulary/).
+//
+// Attributes are strongly typed. The supported attribute types are defined by
+// [ValueType](https://github.com/istio/api/blob/master/policy/v1beta1/value_type.proto).
+// Each type of value is encoded into one of the so-called transport types present
+// in this message.
+//
+// Defines a map of attributes in uncompressed format.
+// Following places may use this message:
+// 1) Configure Istio/Proxy with static per-proxy attributes, such as source.uid.
+// 2) Service IDL definition to extract api attributes for active requests.
+// 3) Forward attributes from client proxy to server proxy for HTTP requests.
+Attributes: {
+ // A map of attribute name to its value.
+ attributes <_>: Attributes_AttributeValue
+}
+
+// Specifies one attribute value with different type.
+Attributes_AttributeValue: {
+}
+// The attribute value.
+Attributes_AttributeValue: {
+ // Used for values of type STRING, DNS_NAME, EMAIL_ADDRESS, and URI
+ stringValue: string @protobuf(2,name=string_value)
+} | {
+ // Used for values of type INT64
+ int64Value: int64 @protobuf(3,name=int64_value)
+} | {
+ // Used for values of type DOUBLE
+ doubleValue: float64 @protobuf(4,type=double,name=double_value)
+} | {
+ // Used for values of type BOOL
+ boolValue: bool @protobuf(5,name=bool_value)
+} | {
+ // Used for values of type BYTES
+ bytesValue: bytes @protobuf(6,name=bytes_value)
+} | {
+ // Used for values of type TIMESTAMP
+ timestampValue: time.Time @protobuf(7,type=google.protobuf.Timestamp,name=timestamp_value)
+} | {
+ // Used for values of type DURATION
+ durationValue: time.Duration @protobuf(8,type=google.protobuf.Duration,name=duration_value)
+} | {
+ // Used for values of type STRING_MAP
+ stringMapValue: Attributes_StringMap @protobuf(9,type=StringMap,name=string_map_value)
+}
+
+// Defines a string map.
+Attributes_StringMap: {
+ // Holds a set of name/value pairs.
+ entries <_>: string
+}
+
+// Defines a list of attributes in compressed format optimized for transport.
+// Within this message, strings are referenced using integer indices into
+// one of two string dictionaries. Positive integers index into the global
+// deployment-wide dictionary, whereas negative integers index into the message-level
+// dictionary instead. The message-level dictionary is carried by the
+// `words` field of this message, the deployment-wide dictionary is determined via
+// configuration.
+CompressedAttributes: {
+ // The message-level dictionary.
+ words?: [...string] @protobuf(1)
+
+ // Holds attributes of type STRING, DNS_NAME, EMAIL_ADDRESS, URI
+ strings <_>: int32
+
+ // Holds attributes of type INT64
+ int64s <_>: int64
+
+ // Holds attributes of type DOUBLE
+ doubles <_>: float64
+
+ // Holds attributes of type BOOL
+ bools <_>: bool
+
+ // Holds attributes of type TIMESTAMP
+ timestamps <_>: time.Time
+
+ // Holds attributes of type DURATION
+ durations <_>: time.Duration
+
+ // Holds attributes of type BYTES
+ bytes <_>: bytes
+
+ // Holds attributes of type STRING_MAP
+ stringMaps <_>: StringMap
+}
+
+// A map of string to string. The keys and values in this map are dictionary
+// indices (see the [Attributes][istio.mixer.v1.CompressedAttributes] message for an explanation)
+StringMap: {
+ // Holds a set of name/value pairs.
+ entries <_>: int32
+}
