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image.go
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image.go
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// Copyright 2021-2023 EMQ Technologies Co., Ltd.
//
// 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 image
import (
"bytes"
"context"
"fmt"
"image/jpeg"
"image/png"
"os"
"path/filepath"
"strings"
"time"
"github.com/lf-edge/ekuiper/pkg/api"
)
type imageSink struct {
path string
format string
maxAge int
maxCount int
cancel context.CancelFunc
}
func (m *imageSink) Configure(props map[string]interface{}) error {
if i, ok := props["imageFormat"]; ok {
if i, ok := i.(string); ok {
if "png" != i && "jpeg" != i {
return fmt.Errorf("%s image type is not currently supported", i)
}
m.format = i
}
} else {
return fmt.Errorf("Field not found format.")
}
if i, ok := props["path"]; ok {
if ii, ok := i.(string); ok {
m.path = ii
} else {
return fmt.Errorf("%v image type is not supported", i)
}
} else {
return fmt.Errorf("Field not found path.")
}
m.maxAge = 72
if i, ok := props["maxAge"]; ok {
if i, ok := i.(int); ok {
m.maxAge = i
}
}
m.maxCount = 1000
if i, ok := props["maxCount"]; ok {
if i, ok := i.(int); ok {
m.maxCount = i
}
}
return nil
}
func (m *imageSink) Open(ctx api.StreamContext) error {
logger := ctx.GetLogger()
logger.Debug("Opening image sink")
if _, err := os.Stat(m.path); os.IsNotExist(err) {
if err := os.MkdirAll(m.path, os.ModePerm); nil != err {
return fmt.Errorf("fail to open image sink for %v", err)
}
}
t := time.NewTicker(time.Duration(3) * time.Minute)
exeCtx, cancel := ctx.WithCancel()
m.cancel = cancel
go func() {
defer t.Stop()
for {
select {
case <-t.C:
m.delFile(logger)
case <-exeCtx.Done():
logger.Info("image sink done")
return
}
}
}()
return nil
}
func (m *imageSink) delFile(logger api.Logger) error {
dirEntries, err := os.ReadDir(m.path)
if nil != err || 0 == len(dirEntries) {
return err
}
files := make([]os.FileInfo, 0, len(dirEntries))
for _, entry := range dirEntries {
info, err := entry.Info()
if err != nil {
continue
}
files = append(files, info)
}
pos := m.maxCount
delTime := time.Now().Add(time.Duration(0-m.maxAge) * time.Hour)
for i := 0; i < len(files); i++ {
for j := i + 1; j < len(files); j++ {
if files[i].ModTime().Before(files[j].ModTime()) {
files[i], files[j] = files[j], files[i]
}
}
if files[i].ModTime().Before(delTime) && i < pos {
pos = i
break
}
}
for i := pos; i < len(files); i++ {
fname := files[i].Name()
if strings.HasSuffix(fname, m.format) {
fpath := filepath.Join(m.path, fname)
os.Remove(fpath)
}
}
return nil
}
func (m *imageSink) getSuffix() string {
now := time.Now()
year, month, day := now.Date()
hour, minute, second := now.Clock()
nsecond := now.Nanosecond()
return fmt.Sprintf(`%d-%d-%d_%d-%d-%d-%d`, year, month, day, hour, minute, second, nsecond)
}
func (m *imageSink) saveFile(b []byte, fpath string) error {
reader := bytes.NewReader(b)
fp, err := os.Create(fpath)
if nil != err {
return err
}
defer fp.Close()
if "png" == m.format {
if img, err := png.Decode(reader); nil != err {
return err
} else if err = png.Encode(fp, img); nil != err {
return err
}
} else if "jpeg" == m.format {
if img, err := jpeg.Decode(reader); nil != err {
return err
} else if err = jpeg.Encode(fp, img, nil); nil != err {
return err
}
}
return nil
}
func (m *imageSink) saveFiles(images map[string]interface{}) error {
for k, v := range images {
image, ok := v.([]byte)
if !ok {
return fmt.Errorf("found none bytes data %v for path %s", image, k)
}
suffix := m.getSuffix()
fname := fmt.Sprintf(`%s%s.%s`, k, suffix, m.format)
fpath := filepath.Join(m.path, fname)
m.saveFile(image, fpath)
}
return nil
}
func (m *imageSink) Collect(ctx api.StreamContext, item interface{}) error {
logger := ctx.GetLogger()
switch v := item.(type) {
case []map[string]interface{}:
var outer error
for _, vm := range v {
err := m.saveFiles(vm)
if err != nil {
outer = err
logger.Error(err)
}
}
return outer
case map[string]interface{}:
return m.saveFiles(v)
default:
return fmt.Errorf("image sink receive invalid data %v", item)
}
}
func (m *imageSink) Close(ctx api.StreamContext) error {
if m.cancel != nil {
m.cancel()
}
return m.delFile(ctx.GetLogger())
}
func GetSink() api.Sink {
return &imageSink{}
}