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deserialize.go
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deserialize.go
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// Copyright (c) 2019 The Jaeger Authors.
// Copyright (c) 2018 Uber Technologies, Inc.
//
// 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 zipkin
import (
"context"
"github.com/apache/thrift/lib/go/thrift"
"github.com/jaegertracing/jaeger/thrift-gen/zipkincore"
)
// SerializeThrift is only used in tests.
func SerializeThrift(spans []*zipkincore.Span) []byte {
ctx := context.Background()
t := thrift.NewTMemoryBuffer()
p := thrift.NewTBinaryProtocolConf(t, &thrift.TConfiguration{})
p.WriteListBegin(ctx, thrift.STRUCT, len(spans))
for _, s := range spans {
s.Write(ctx, p)
}
p.WriteListEnd(ctx)
return t.Buffer.Bytes()
}
// DeserializeThrift decodes Thrift bytes to a list of spans.
func DeserializeThrift(b []byte) ([]*zipkincore.Span, error) {
ctx := context.Background()
buffer := thrift.NewTMemoryBuffer()
buffer.Write(b)
transport := thrift.NewTBinaryProtocolConf(buffer, &thrift.TConfiguration{})
_, size, err := transport.ReadListBegin(ctx) // Ignore the returned element type
if err != nil {
return nil, err
}
// We don't depend on the size returned by ReadListBegin to preallocate the array because it
// sometimes returns a nil error on bad input and provides an unreasonably large int for size
var spans []*zipkincore.Span
for i := 0; i < size; i++ {
zs := &zipkincore.Span{}
if err = zs.Read(ctx, transport); err != nil {
return nil, err
}
spans = append(spans, zs)
}
return spans, nil
}