67 lines
1.4 KiB
Go
67 lines
1.4 KiB
Go
package main
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import (
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"io"
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"log"
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"os"
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"strings"
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"github.com/hashicorp/logutils"
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)
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// These are the environmental variables that determine if we log, and if
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// we log whether or not the log should go to a file.
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const (
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EnvLog = "TF_LOG" // Set to True
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EnvLogFile = "TF_LOG_PATH" // Set to a file
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)
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var validLevels = []logutils.LogLevel{"TRACE", "DEBUG", "INFO", "WARN", "ERROR"}
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// logOutput determines where we should send logs (if anywhere) and the log level.
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func logOutput() (logOutput io.Writer, err error) {
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logOutput = nil
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envLevel := os.Getenv(EnvLog)
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if envLevel == "" {
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return
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}
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logOutput = os.Stderr
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if logPath := os.Getenv(EnvLogFile); logPath != "" {
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var err error
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logOutput, err = os.Create(logPath)
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if err != nil {
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return nil, err
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}
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}
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// This was the default since the beginning
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logLevel := logutils.LogLevel("TRACE")
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if isValidLogLevel(envLevel) {
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// allow following for better ux: info, Info or INFO
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logLevel = logutils.LogLevel(strings.ToUpper(envLevel))
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} else {
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log.Printf("[WARN] Invalid log level: %q. Defaulting to level: TRACE. Valid levels are: %+v",
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envLevel, validLevels)
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}
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logOutput = &logutils.LevelFilter{
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Levels: validLevels,
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MinLevel: logLevel,
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Writer: logOutput,
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}
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return
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}
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func isValidLogLevel(level string) bool {
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for _, l := range validLevels {
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if strings.ToUpper(level) == string(l) {
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return true
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}
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}
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return false
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}
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