146 lines
3.5 KiB
Go
146 lines
3.5 KiB
Go
package logger
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import (
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"fmt"
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"os"
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"path/filepath"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/hashicorp/logutils"
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)
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var (
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now = time.Now
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)
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//LogFile is used to setup a file based logger that also performs log rotation
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type LogFile struct {
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// Log level Filter to filter out logs that do not matcch LogLevel criteria
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logFilter *logutils.LevelFilter
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//Name of the log file
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fileName string
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//Path to the log file
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logPath string
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//Duration between each file rotation operation
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duration time.Duration
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//LastCreated represents the creation time of the latest log
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LastCreated time.Time
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//FileInfo is the pointer to the current file being written to
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FileInfo *os.File
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//MaxBytes is the maximum number of desired bytes for a log file
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MaxBytes int
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//BytesWritten is the number of bytes written in the current log file
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BytesWritten int64
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// Max rotated files to keep before removing them.
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MaxFiles int
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//acquire is the mutex utilized to ensure we have no concurrency issues
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acquire sync.Mutex
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}
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func (l *LogFile) fileNamePattern() string {
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// Extract the file extension
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fileExt := filepath.Ext(l.fileName)
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// If we have no file extension we append .log
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if fileExt == "" {
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fileExt = ".log"
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}
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// Remove the file extension from the filename
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return strings.TrimSuffix(l.fileName, fileExt) + "-%s" + fileExt
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}
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func (l *LogFile) openNew() error {
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fileNamePattern := l.fileNamePattern()
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createTime := now()
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newfileName := fmt.Sprintf(fileNamePattern, strconv.FormatInt(createTime.UnixNano(), 10))
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newfilePath := filepath.Join(l.logPath, newfileName)
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// Try creating a file. We truncate the file because we are the only authority to write the logs
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filePointer, err := os.OpenFile(newfilePath, os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0640)
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if err != nil {
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return err
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}
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l.FileInfo = filePointer
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// New file, new bytes tracker, new creation time :)
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l.LastCreated = createTime
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l.BytesWritten = 0
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return nil
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}
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func (l *LogFile) rotate() error {
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// Get the time from the last point of contact
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timeElapsed := time.Since(l.LastCreated)
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// Rotate if we hit the byte file limit or the time limit
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if (l.BytesWritten >= int64(l.MaxBytes) && (l.MaxBytes > 0)) || timeElapsed >= l.duration {
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l.FileInfo.Close()
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if err := l.pruneFiles(); err != nil {
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return err
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}
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return l.openNew()
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}
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return nil
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}
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func (l *LogFile) pruneFiles() error {
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if l.MaxFiles == 0 {
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return nil
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}
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pattern := l.fileNamePattern()
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//get all the files that match the log file pattern
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globExpression := filepath.Join(l.logPath, fmt.Sprintf(pattern, "*"))
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matches, err := filepath.Glob(globExpression)
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if err != nil {
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return err
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}
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var stale int
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if l.MaxFiles <= -1 {
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// Prune everything
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stale = len(matches)
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} else {
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// Prune if there are more files stored than the configured max
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stale = len(matches) - l.MaxFiles
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}
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for i := 0; i < stale; i++ {
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if err := os.Remove(matches[i]); err != nil {
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return err
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}
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}
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return nil
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}
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// Write is used to implement io.Writer
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func (l *LogFile) Write(b []byte) (n int, err error) {
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// Filter out log entries that do not match log level criteria
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if !l.logFilter.Check(b) {
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return 0, nil
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}
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l.acquire.Lock()
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defer l.acquire.Unlock()
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// Create a new file if we have no file to write to
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if l.FileInfo == nil {
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if err := l.openNew(); err != nil {
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return 0, err
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}
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}
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// Check for the last contact and rotate if necessary
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if err := l.rotate(); err != nil {
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return 0, err
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}
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l.BytesWritten += int64(len(b))
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return l.FileInfo.Write(b)
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}
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