1 files changed, 126 insertions, 0 deletions
diff --git a/vendor/github.com/googleapis/gax-go/v2/proto_json_stream.go b/vendor/github.com/googleapis/gax-go/v2/proto_json_stream.go
new file mode 100644
index 0000000..cc4486e
--- /dev/null
+++ b/vendor/github.com/googleapis/gax-go/v2/proto_json_stream.go
@@ -0,0 +1,126 @@
+// Copyright 2022, Google Inc.
+// All rights reserved.
+//
+// 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.
+
+package gax
+
+import (
+	"encoding/json"
+	"errors"
+	"io"
+
+	"google.golang.org/protobuf/encoding/protojson"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/reflect/protoreflect"
+)
+
+var (
+	arrayOpen     = json.Delim('[')
+	arrayClose    = json.Delim(']')
+	errBadOpening = errors.New("unexpected opening token, expected '['")
+)
+
+// ProtoJSONStream represents a wrapper for consuming a stream of protobuf
+// messages encoded using protobuf-JSON format. More information on this format
+// can be found at https://developers.google.com/protocol-buffers/docs/proto3#json.
+// The stream must appear as a comma-delimited, JSON array of obbjects with
+// opening and closing square braces.
+//
+// This is for internal use only.
+type ProtoJSONStream struct {
+	first, closed bool
+	reader        io.ReadCloser
+	stream        *json.Decoder
+	typ           protoreflect.MessageType
+}
+
+// NewProtoJSONStreamReader accepts a stream of bytes via an io.ReadCloser that are
+// protobuf-JSON encoded protobuf messages of the given type. The ProtoJSONStream
+// must be closed when done.
+//
+// This is for internal use only.
+func NewProtoJSONStreamReader(rc io.ReadCloser, typ protoreflect.MessageType) *ProtoJSONStream {
+	return &ProtoJSONStream{
+		first:  true,
+		reader: rc,
+		stream: json.NewDecoder(rc),
+		typ:    typ,
+	}
+}
+
+// Recv decodes the next protobuf message in the stream or returns io.EOF if
+// the stream is done. It is not safe to call Recv on the same stream from
+// different goroutines, just like it is not safe to do so with a single gRPC
+// stream. Type-cast the protobuf message returned to the type provided at
+// ProtoJSONStream creation.
+// Calls to Recv after calling Close will produce io.EOF.
+func (s *ProtoJSONStream) Recv() (proto.Message, error) {
+	if s.closed {
+		return nil, io.EOF
+	}
+	if s.first {
+		s.first = false
+
+		// Consume the opening '[' so Decode gets one object at a time.
+		if t, err := s.stream.Token(); err != nil {
+			return nil, err
+		} else if t != arrayOpen {
+			return nil, errBadOpening
+		}
+	}
+
+	// Capture the next block of data for the item (a JSON object) in the stream.
+	var raw json.RawMessage
+	if err := s.stream.Decode(&raw); err != nil {
+		e := err
+		// To avoid checking the first token of each stream, just attempt to
+		// Decode the next blob and if that fails, double check if it is just
+		// the closing token ']'. If it is the closing, return io.EOF. If it
+		// isn't, return the original error.
+		if t, _ := s.stream.Token(); t == arrayClose {
+			e = io.EOF
+		}
+		return nil, e
+	}
+
+	// Initialize a new instance of the protobuf message to unmarshal the
+	// raw data into.
+	m := s.typ.New().Interface()
+	err := protojson.Unmarshal(raw, m)
+
+	return m, err
+}
+
+// Close closes the stream so that resources are cleaned up.
+func (s *ProtoJSONStream) Close() error {
+	// Dereference the *json.Decoder so that the memory is gc'd.
+	s.stream = nil
+	s.closed = true
+
+	return s.reader.Close()
+}