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|
package mint
import (
"fmt"
"log"
"os"
"strings"
)
// We use this environment variable to control logging. It should be a
// comma-separated list of log tags (see below) or "*" to enable all logging.
const logConfigVar = "MINT_LOG"
// Pre-defined log types
const (
logTypeCrypto = "crypto"
logTypeHandshake = "handshake"
logTypeNegotiation = "negotiation"
logTypeIO = "io"
logTypeFrameReader = "frame"
logTypeVerbose = "verbose"
)
var (
logFunction = log.Printf
logAll = false
logSettings = map[string]bool{}
)
func init() {
parseLogEnv(os.Environ())
}
func parseLogEnv(env []string) {
for _, stmt := range env {
if strings.HasPrefix(stmt, logConfigVar+"=") {
val := stmt[len(logConfigVar)+1:]
if val == "*" {
logAll = true
} else {
for _, t := range strings.Split(val, ",") {
logSettings[t] = true
}
}
}
}
}
func logf(tag string, format string, args ...interface{}) {
if logAll || logSettings[tag] {
fullFormat := fmt.Sprintf("[%s] %s", tag, format)
logFunction(fullFormat, args...)
}
}
|
