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buffer.go
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buffer.go
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package buffer
import (
"fmt"
"github.com/D3rus/go-library/buffer/file"
memoryBuffer "github.com/D3rus/go-library/buffer/memory"
"github.com/D3rus/go-library/configurator"
"github.com/D3rus/go-library/container"
"github.com/D3rus/go-library/logger"
"github.com/D3rus/go-library/memory"
"io"
"strings"
"sync"
"time"
)
//go:generate mockgen -package=buffer -destination=mock_configurator_test.go github.com/D3rus/go-library/configurator Configurator
const (
readFromMemory uint8 = iota
readFromFile
writeToMemory
writeToFile
)
type Buffer io.ReadWriteCloser
type buffer struct {
memory memoryBuffer.Buffer
file file.Buffer
memoryStater memory.Stater
readFrom uint8
writeTo uint8
mutex *sync.Mutex
informer logger.Informer
config *Config
}
func NewWithConfigurator(config *Config, configurator configurator.Configurator, informer logger.Informer, container container.Container) (*Process, error) {
config = Configuration(config, configurator)
var buffer Buffer
var err error
switch config.Strategy {
case MemoryBufferStrategy:
err = container.Invoke(func(memoryBuffer memoryBuffer.Buffer) {
buffer = memoryBuffer
})
case FileBufferStrategy:
err = container.Invoke(func(fileBuffer file.Buffer) {
buffer = fileBuffer
})
case CombinationBufferStrategy:
err = container.Invoke(func(fileBuffer file.Buffer, memoryBuffer memoryBuffer.Buffer, memoryStater memory.Stater) {
buffer = NewBuffer(config, memoryBuffer, fileBuffer, memoryStater, informer)
})
default:
return nil, fmt.Errorf("buffer: strategy '%s' unknown", config.Strategy)
}
informer.Infof("buffer: strategy '%s'", config.Strategy)
if err != nil {
return nil, err
}
return NewProcess(buffer, config, informer), nil
}
func Configuration(config *Config, configurator configurator.Configurator) *Config {
if config.Strategy == "" || config.Strategy == StrategyDefault {
configurator.SetDefault(StrategyFieldName, StrategyDefault)
config.Strategy = strings.ToLower(configurator.GetString(StrategyFieldName))
}
return config
}
func NewBuffer(config *Config, memory memoryBuffer.Buffer, file file.Buffer, memoryStater memory.Stater, informer logger.Informer) Buffer {
return &buffer{
memory: memory,
file: file,
memoryStater: memoryStater,
readFrom: readFromMemory,
writeTo: writeToMemory,
mutex: &sync.Mutex{},
informer: informer,
config: config,
}
}
func (buffer *buffer) Read(p []byte) (int, error) {
if buffer.readFrom == readFromMemory {
length, err := buffer.memory.Read(p)
if err != nil && err != io.EOF {
return 0, err
}
if length > 0 {
return length, nil
}
buffer.readFrom = readFromFile
}
length, err := buffer.file.Read(p)
if err == io.EOF {
buffer.readFrom = readFromMemory
}
return length, err
}
func (buffer *buffer) Write(p []byte) (int, error) {
buffer.mutex.Lock()
defer buffer.mutex.Unlock()
if buffer.memoryStater.State() != memory.Normal || buffer.writeTo == writeToFile {
return buffer.file.Write(p)
}
return buffer.memory.Write(p)
}
func (buffer *buffer) Close() error {
buffer.mutex.Lock()
defer buffer.mutex.Unlock()
buffer.writeTo = writeToFile
if buffer.config.Name != "" {
buffer.informer.Infof("buffer: name '%s', flushing memory data to a file", buffer.config.Name)
} else {
buffer.informer.Info("buffer: flushing memory data to a file")
}
startTime := time.Now()
bytes, err := io.ReadAll(buffer.memory)
if err != nil {
return err
}
if len(bytes) > 0 {
if _, err := buffer.file.Write(bytes); err != nil {
return err
}
if buffer.config.Name != "" {
buffer.informer.Infof("buffer: saved in %s, name '%s'", time.Now().Sub(startTime).String(), buffer.config.Name)
} else {
buffer.informer.Infof("buffer: saved in %s", time.Now().Sub(startTime).String())
}
} else {
buffer.informer.Info("buffer: memory buffer is empty")
}
if err := buffer.memory.Close(); err != nil {
return err
}
return buffer.file.Close()
}