/
reader.go
121 lines (103 loc) · 2.57 KB
/
reader.go
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// Copyright(C) 2022 github.com/fsgo All Rights Reserved.
// Author: hidu <duv123@gmail.com>
// Date: 2022/7/16
package brpc
import (
"bytes"
"errors"
"fmt"
"io"
"sync"
"google.golang.org/protobuf/proto"
)
type Reader struct {
// MaxBodySize 可选,最大 Body 大小,为 0 是会使用 全局变量 MaxBodySize
MaxBodySize uint32
}
// MaxBodySize 默认的最大 body 大小
var MaxBodySize = uint32(10 << 20)
var ErrBodyTooLarge = errors.New("body size is too large")
func (r *Reader) GetMaxBodySize() uint32 {
if r.MaxBodySize == 0 {
return MaxBodySize
}
return r.MaxBodySize
}
func (r *Reader) ReadHeader(rd io.Reader) (Header, error) {
hd, err := ReadHeader(rd)
if err != nil {
return hd, err
}
if n := r.GetMaxBodySize(); hd.BodySize > n {
return hd, fmt.Errorf("%w, got is %d, max allow is %d", ErrBodyTooLarge, hd.BodySize, n)
}
return hd, hd.IsValid()
}
var metaBP = sync.Pool{
New: func() any {
return &bytes.Buffer{}
},
}
func (r *Reader) ReadMeta(rd io.Reader, metaSize uint32) (*Meta, error) {
bf := metaBP.Get().(*bytes.Buffer)
bf.Reset()
bf.Grow(int(metaSize))
defer metaBP.Put(bf)
if _, err := io.CopyN(bf, rd, int64(metaSize)); err != nil {
return nil, err
}
var meta *Meta
if err := proto.Unmarshal(bf.Bytes(), meta); err != nil {
return nil, err
}
return meta, IsMetaInvalid(meta)
}
func (r *Reader) ReadPackage(rd io.Reader) (Header, *Message, error) {
h, err := r.ReadHeader(rd)
if err != nil {
return h, nil, err
}
msg, err := r.ReadMessage(rd, h)
return h, msg, err
}
func (r *Reader) ReadMessage(rd io.Reader, h Header) (*Message, error) {
return r.readRR(rd, h)
}
var attachmentNop = io.NopCloser(&bytes.Buffer{})
func (r *Reader) readRR(rd io.Reader, h Header) (*Message, error) {
meta, err := r.ReadMeta(rd, h.MetaSize)
if err != nil {
return nil, err
}
if meta.GetRequest() == nil {
return nil, fmt.Errorf("%w, RequestMeta is nil", ErrInvalidMeta)
}
amSize := meta.GetAttachmentSize()
body := make([]byte, h.PayloadSize()-uint32(amSize))
if _, err = io.ReadFull(rd, body); err != nil {
return nil, fmt.Errorf("read payload failed: %w", err)
}
ct := meta.GetCompressType()
if ct > 0 {
body, err = deCompress(meta.GetCompressType(), body)
if err != nil {
return nil, err
}
}
var attachment io.Reader
if amSize == 0 {
attachment = attachmentNop
} else {
bf := &bytes.Buffer{}
bf.Grow(int(amSize))
if _, err = io.CopyN(bf, rd, int64(amSize)); err != nil {
return nil, err
}
attachment = bf
}
return &Message{
Meta: meta,
body: body,
Attachment: attachment,
}, nil
}