90 lines
2.7 KiB
Go
90 lines
2.7 KiB
Go
package logger
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import (
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"fmt"
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"io"
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"strings"
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"time"
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"github.com/hashicorp/go-syslog"
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"github.com/hashicorp/logutils"
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"github.com/mitchellh/cli"
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)
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// Config is used to set up logging.
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type Config struct {
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// LogLevel is the minimum level to be logged.
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LogLevel string
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// EnableSyslog controls forwarding to syslog.
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EnableSyslog bool
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// SyslogFacility is the destination for syslog forwarding.
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SyslogFacility string
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}
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// Setup is used to perform setup of several logging objects:
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//
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// * A LevelFilter is used to perform filtering by log level.
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// * A GatedWriter is used to buffer logs until startup UI operations are
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// complete. After this is flushed then logs flow directly to output
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// destinations.
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// * A LogWriter provides a mean to temporarily hook logs, such as for running
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// a command like "consul monitor".
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// * An io.Writer is provided as the sink for all logs to flow to.
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//
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// The provided ui object will get any log messages related to setting up
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// logging itself, and will also be hooked up to the gated logger. The final bool
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// parameter indicates if logging was set up successfully.
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func Setup(config *Config, ui cli.Ui) (*logutils.LevelFilter, *GatedWriter, *LogWriter, io.Writer, bool) {
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// The gated writer buffers logs at startup and holds until it's flushed.
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logGate := &GatedWriter{
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Writer: &cli.UiWriter{Ui: ui},
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}
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// Set up the level filter.
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logFilter := LevelFilter()
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logFilter.MinLevel = logutils.LogLevel(strings.ToUpper(config.LogLevel))
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logFilter.Writer = logGate
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if !ValidateLevelFilter(logFilter.MinLevel, logFilter) {
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ui.Error(fmt.Sprintf(
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"Invalid log level: %s. Valid log levels are: %v",
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logFilter.MinLevel, logFilter.Levels))
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return nil, nil, nil, nil, false
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}
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// Set up syslog if it's enabled.
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var syslog io.Writer
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if config.EnableSyslog {
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retries := 12
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delay := 5 * time.Second
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for i := 0; i <= retries; i++ {
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l, err := gsyslog.NewLogger(gsyslog.LOG_NOTICE, config.SyslogFacility, "consul")
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if err != nil {
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ui.Error(fmt.Sprintf("Syslog setup error: %v", err))
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if i == retries {
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timeout := time.Duration(retries) * delay
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ui.Error(fmt.Sprintf("Syslog setup did not succeed within timeout (%s).", timeout.String()))
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return nil, nil, nil, nil, false
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} else {
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ui.Error(fmt.Sprintf("Retrying syslog setup in %s...", delay.String()))
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time.Sleep(delay)
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}
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} else {
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syslog = &SyslogWrapper{l, logFilter}
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break
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}
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}
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}
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// Create a log writer, and wrap a logOutput around it
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logWriter := NewLogWriter(512)
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var logOutput io.Writer
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if syslog != nil {
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logOutput = io.MultiWriter(logFilter, logWriter, syslog)
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} else {
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logOutput = io.MultiWriter(logFilter, logWriter)
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}
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return logFilter, logGate, logWriter, logOutput, true
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}
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