forked from caddyserver/caddy
/
setup.go
142 lines (125 loc) · 2.96 KB
/
setup.go
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package log
import (
"io"
"log"
"os"
"github.com/hashicorp/go-syslog"
"github.com/mholt/caddy"
"github.com/mholt/caddy/caddyhttp/httpserver"
)
// setup sets up the logging middleware.
func setup(c *caddy.Controller) error {
rules, err := logParse(c)
if err != nil {
return err
}
// Open the log files for writing when the server starts
c.OnStartup(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", "caddy")
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 {
rules[i].file = file
writer = file
}
}
rules[i].Log = log.New(writer, "", 0)
}
return nil
})
// When server stops, close any open log files
c.OnShutdown(func() error {
for _, rule := range rules {
if rule.file != nil {
rule.file.Close()
}
}
return nil
})
httpserver.GetConfig(c).AddMiddleware(func(next httpserver.Handler) httpserver.Handler {
return Logger{Next: next, Rules: rules, ErrorFunc: httpserver.DefaultErrorFunc}
})
return nil
}
func logParse(c *caddy.Controller) ([]Rule, error) {
var rules []Rule
for c.Next() {
args := c.RemainingArgs()
var logRoller *httpserver.LogRoller
if c.NextBlock() {
if c.Val() == "rotate" {
if c.NextArg() {
if c.Val() == "{" {
var err error
logRoller, err = httpserver.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, Rule{
PathScope: "/",
OutputFile: DefaultLogFilename,
Format: DefaultLogFormat,
Roller: logRoller,
})
} else if len(args) == 1 {
// Only an output file specified
rules = append(rules, Rule{
PathScope: "/",
OutputFile: args[0],
Format: DefaultLogFormat,
Roller: logRoller,
})
} else {
// Path scope, output file, and maybe a format specified
format := DefaultLogFormat
if len(args) > 2 {
switch args[2] {
case "{common}":
format = CommonLogFormat
case "{combined}":
format = CombinedLogFormat
default:
format = args[2]
}
}
rules = append(rules, Rule{
PathScope: args[0],
OutputFile: args[1],
Format: format,
Roller: logRoller,
})
}
}
return rules, nil
}