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81 lines
1.6 KiB
81 lines
1.6 KiB
// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package packet
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import (
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"bytes"
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"encoding/json"
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"io"
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"time"
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"github.com/pkg/errors"
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)
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var getId = func() uint64 {
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return uint64(time.Now().UnixNano() / 1000)
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}
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func Marshal(p *Packet) ([]byte, error) {
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b := &bytes.Buffer{}
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enc := NewEncoder(b)
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if err := enc.Encode(p); err != nil {
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return nil, err
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}
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return b.Bytes(), nil
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}
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type Encoder struct {
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w io.Writer
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j *json.Encoder
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}
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func NewEncoder(w io.Writer) *Encoder {
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return &Encoder{
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w: w,
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j: json.NewEncoder(w),
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}
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}
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type auxPacket struct {
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Packet
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Body interface{} `json:"body"`
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}
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func (e *Encoder) Encode(p *Packet) error {
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if p == nil {
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return errors.New("no packet")
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}
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if p.Type == "" {
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return errors.New("packet type not set")
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}
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id := p.Id
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if id == 0 {
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id = getId()
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}
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body := p.auxBody
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// encodes packet and appends a newline character
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err := e.j.Encode(auxPacket{
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Packet: Packet{
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Id: id,
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Type: p.Type,
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},
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Body: body,
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})
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if err != nil {
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return errors.Wrap(err, "failed to encode body")
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}
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return nil
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}
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