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server.go
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server.go
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// Copyright (c) 2017 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 servers
import (
"io"
)
// Server is the interface for servers that receive inbound span submissions from client.
type Server interface {
Serve()
IsServing() bool
Stop()
DataChan() chan *ReadBuf
DataRecd(*ReadBuf) // must be called by consumer after reading data from the ReadBuf
}
// ReadBuf is a structure that holds the bytes to read into as well as the number of bytes
// that was read. The slice is typically pre-allocated to the max packet size and the buffers
// themselves are polled to avoid memory allocations for every new inbound message.
type ReadBuf struct {
bytes []byte
n int
}
// GetBytes returns the contents of the ReadBuf as bytes
func (r *ReadBuf) GetBytes() []byte {
return r.bytes[:r.n]
}
func (r *ReadBuf) Read(p []byte) (int, error) {
if r.n == 0 {
return 0, io.EOF
}
n := r.n
copied := copy(p, r.bytes[:n])
r.n -= copied
return n, nil
}