151 lines
4.3 KiB
Go
151 lines
4.3 KiB
Go
// Copyright (c) 2015 Uber Technologies, Inc.
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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package tchannel
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import (
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"bufio"
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"encoding/json"
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"io"
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"io/ioutil"
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"github.com/uber/tchannel-go/internal/argreader"
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)
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// ArgReader is the interface for the arg2 and arg3 streams on an
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// OutboundCallResponse and an InboundCall
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type ArgReader io.ReadCloser
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// ArgWriter is the interface for the arg2 and arg3 streams on an OutboundCall
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// and an InboundCallResponse
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type ArgWriter interface {
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io.WriteCloser
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// Flush flushes the currently written bytes without waiting for the frame
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// to be filled.
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Flush() error
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}
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// ArgWritable is an interface for providing arg2 and arg3 writer streams;
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// implemented by reqResWriter e.g. OutboundCall and InboundCallResponse
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type ArgWritable interface {
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Arg2Writer() (ArgWriter, error)
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Arg3Writer() (ArgWriter, error)
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}
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// ArgReadable is an interface for providing arg2 and arg3 reader streams;
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// implemented by reqResReader e.g. InboundCall and OutboundCallResponse.
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type ArgReadable interface {
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Arg2Reader() (ArgReader, error)
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Arg3Reader() (ArgReader, error)
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}
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// ArgReadHelper providers a simpler interface to reading arguments.
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type ArgReadHelper struct {
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reader ArgReader
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err error
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}
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// NewArgReader wraps the result of calling ArgXReader to provide a simpler
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// interface for reading arguments.
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func NewArgReader(reader ArgReader, err error) ArgReadHelper {
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return ArgReadHelper{reader, err}
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}
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func (r ArgReadHelper) read(f func() error) error {
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if r.err != nil {
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return r.err
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}
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if err := f(); err != nil {
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return err
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}
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if err := argreader.EnsureEmpty(r.reader, "read arg"); err != nil {
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return err
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}
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return r.reader.Close()
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}
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// Read reads from the reader into the byte slice.
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func (r ArgReadHelper) Read(bs *[]byte) error {
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return r.read(func() error {
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var err error
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*bs, err = ioutil.ReadAll(r.reader)
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return err
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})
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}
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// ReadJSON deserializes JSON from the underlying reader into data.
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func (r ArgReadHelper) ReadJSON(data interface{}) error {
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return r.read(func() error {
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// TChannel allows for 0 length values (not valid JSON), so we use a bufio.Reader
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// to check whether data is of 0 length.
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reader := bufio.NewReader(r.reader)
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if _, err := reader.Peek(1); err == io.EOF {
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// If the data is 0 length, then we don't try to read anything.
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return nil
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} else if err != nil {
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return err
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}
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d := json.NewDecoder(reader)
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return d.Decode(data)
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})
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}
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// ArgWriteHelper providers a simpler interface to writing arguments.
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type ArgWriteHelper struct {
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writer io.WriteCloser
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err error
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}
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// NewArgWriter wraps the result of calling ArgXWriter to provider a simpler
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// interface for writing arguments.
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func NewArgWriter(writer io.WriteCloser, err error) ArgWriteHelper {
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return ArgWriteHelper{writer, err}
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}
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func (w ArgWriteHelper) write(f func() error) error {
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if w.err != nil {
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return w.err
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}
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if err := f(); err != nil {
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return err
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}
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return w.writer.Close()
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}
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// Write writes the given bytes to the underlying writer.
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func (w ArgWriteHelper) Write(bs []byte) error {
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return w.write(func() error {
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_, err := w.writer.Write(bs)
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return err
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})
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}
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// WriteJSON writes the given object as JSON.
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func (w ArgWriteHelper) WriteJSON(data interface{}) error {
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return w.write(func() error {
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e := json.NewEncoder(w.writer)
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return e.Encode(data)
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})
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}
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