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package setup
import (
"io"
"log"
"os"
"github.com/hashicorp/go-syslog"
"github.com/miekg/coredns/middleware"
corednslog "github.com/miekg/coredns/middleware/log"
"github.com/miekg/coredns/server"
"github.com/miekg/dns"
)
// Log sets up the logging middleware.
func Log(c *Controller) (middleware.Middleware, error) {
rules, err := logParse(c)
if err != nil {
return nil, err
}
// Open the log files for writing when the server starts
c.Startup = append(c.Startup, func() error {
for i := 0; i < len(rules); i++ {
var err error
var writer io.Writer
if rules[i].OutputFile == "stdout" {
writer = os.Stdout
} else if rules[i].OutputFile == "stderr" {
writer = os.Stderr
} else if rules[i].OutputFile == "syslog" {
writer, err = gsyslog.NewLogger(gsyslog.LOG_INFO, "LOCAL0", "coredns")
if err != nil {
return err
}
} else {
var file *os.File
file, err = os.OpenFile(rules[i].OutputFile, os.O_RDWR|os.O_CREATE|os.O_APPEND, 0644)
if err != nil {
return err
}
if rules[i].Roller != nil {
file.Close()
rules[i].Roller.Filename = rules[i].OutputFile
writer = rules[i].Roller.GetLogWriter()
} else {
writer = file
}
}
rules[i].Log = log.New(writer, "", 0)
}
return nil
})
return func(next middleware.Handler) middleware.Handler {
return corednslog.Logger{Next: next, Rules: rules, ErrorFunc: server.DefaultErrorFunc}
}, nil
}
func logParse(c *Controller) ([]corednslog.Rule, error) {
var rules []corednslog.Rule
for c.Next() {
args := c.RemainingArgs()
var logRoller *middleware.LogRoller
if c.NextBlock() {
if c.Val() == "rotate" {
if c.NextArg() {
if c.Val() == "{" {
var err error
logRoller, err = parseRoller(c)
if err != nil {
return nil, err
}
// This part doesn't allow having something after the rotate block
if c.Next() {
if c.Val() != "}" {
return nil, c.ArgErr()
}
}
}
}
}
}
if len(args) == 0 {
// Nothing specified; use defaults
rules = append(rules, corednslog.Rule{
NameScope: ".",
OutputFile: corednslog.DefaultLogFilename,
Format: corednslog.DefaultLogFormat,
Roller: logRoller,
})
} else if len(args) == 1 {
// Only an output file specified
rules = append(rules, corednslog.Rule{
NameScope: ".",
OutputFile: args[0],
Format: corednslog.DefaultLogFormat,
Roller: logRoller,
})
} else {
// Name scope, output file, and maybe a format specified
format := corednslog.DefaultLogFormat
if len(args) > 2 {
switch args[2] {
case "{common}":
format = corednslog.CommonLogFormat
case "{combined}":
format = corednslog.CombinedLogFormat
default:
format = args[2]
}
}
rules = append(rules, corednslog.Rule{
NameScope: dns.Fqdn(args[0]),
OutputFile: args[1],
Format: format,
Roller: logRoller,
})
}
}
return rules, nil
}
|
