blob: bf1ae86c336695578db083fe789456fe00554d15 [file] [log] [blame]
// Copyright 2019 The LUCI Authors.
//
// 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 bbinput
import (
"bytes"
"compress/zlib"
"encoding/base64"
"io/ioutil"
"github.com/golang/protobuf/proto"
bbpb "go.chromium.org/luci/buildbucket/proto"
"go.chromium.org/luci/common/errors"
)
// Parse returns proto.Unmarshal(zlibDec(base64Dec(encodedData))).
func Parse(encodedData string) (*bbpb.BBAgentArgs, error) {
if encodedData == "" {
return nil, errors.New("inputs required")
}
compressed, err := base64.RawStdEncoding.DecodeString(encodedData)
if err != nil {
return nil, errors.Annotate(err, "decoding base64").Err()
}
decompressing, err := zlib.NewReader(bytes.NewReader(compressed))
if err != nil {
return nil, errors.Annotate(err, "opening zlib reader").Err()
}
decompressed, err := ioutil.ReadAll(decompressing)
if err != nil {
return nil, errors.Annotate(err, "decompressing zlib").Err()
}
ret := &bbpb.BBAgentArgs{}
return ret, errors.Annotate(proto.Unmarshal(decompressed, ret), "parsing proto").Err()
}
// Encode returns base64(zlib(proto.Marshal(args))).
func Encode(args *bbpb.BBAgentArgs) string {
pbuf := proto.NewBuffer(nil)
pbuf.SetDeterministic(true)
err := pbuf.Marshal(args)
if err != nil {
// can only happen if there are unmarshalable extensions in args, which
// isn't possible.
panic("impossible: " + err.Error())
}
var buf bytes.Buffer
zw, err := zlib.NewWriterLevel(&buf, zlib.BestCompression)
if err != nil {
// can only happen if zlib.BestCompression is an invalid value.
panic("impossible: " + err.Error())
}
if _, err = zw.Write(pbuf.Bytes()); err != nil {
// can only happen if buf.Write returns an error
panic("impossible: " + err.Error())
}
if err = zw.Close(); err != nil {
// can only happen if buf.Close returns an error
panic("impossible: " + err.Error())
}
return base64.RawStdEncoding.EncodeToString(buf.Bytes())
}