github.com/sijibomii/docker@v0.0.0-20231230191044-5cf6ca554647/daemon/logger/loggerutils/log_tag.go (about)

     1  package loggerutils
     2  
     3  import (
     4  	"bytes"
     5  	"fmt"
     6  
     7  	"github.com/Sirupsen/logrus"
     8  	"github.com/docker/docker/daemon/logger"
     9  	"github.com/docker/docker/utils/templates"
    10  )
    11  
    12  // ParseLogTag generates a context aware tag for consistency across different
    13  // log drivers based on the context of the running container.
    14  func ParseLogTag(ctx logger.Context, defaultTemplate string) (string, error) {
    15  	tagTemplate := lookupTagTemplate(ctx, defaultTemplate)
    16  
    17  	tmpl, err := templates.NewParse("log-tag", tagTemplate)
    18  	if err != nil {
    19  		return "", err
    20  	}
    21  	buf := new(bytes.Buffer)
    22  	if err := tmpl.Execute(buf, &ctx); err != nil {
    23  		return "", err
    24  	}
    25  
    26  	return buf.String(), nil
    27  }
    28  
    29  func lookupTagTemplate(ctx logger.Context, defaultTemplate string) string {
    30  	tagTemplate := ctx.Config["tag"]
    31  
    32  	deprecatedConfigs := []string{"syslog-tag", "gelf-tag", "fluentd-tag"}
    33  	for i := 0; tagTemplate == "" && i < len(deprecatedConfigs); i++ {
    34  		cfg := deprecatedConfigs[i]
    35  		if ctx.Config[cfg] != "" {
    36  			tagTemplate = ctx.Config[cfg]
    37  			logrus.Warn(fmt.Sprintf("Using log tag from deprecated log-opt '%s'. Please use: --log-opt tag=\"%s\"", cfg, tagTemplate))
    38  		}
    39  	}
    40  
    41  	if tagTemplate == "" {
    42  		tagTemplate = defaultTemplate
    43  	}
    44  
    45  	return tagTemplate
    46  }