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4c76865d0e
Add JSON over TCP support. Add support for multiple loggers. Make logging configurable. Signed-off-by: Alexey Palazhchenko <alexey.palazhchenko@talos-systems.com>
88 lines
2.3 KiB
Go
88 lines
2.3 KiB
Go
// This Source Code Form is subject to the terms of the Mozilla Public
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// License, v. 2.0. If a copy of the MPL was not distributed with this
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// file, You can obtain one at http://mozilla.org/MPL/2.0/.
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package runtime
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import (
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"context"
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"fmt"
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"io"
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"time"
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"go.uber.org/zap/zapcore"
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)
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// LoggingManager provides unified interface to publish and consume logs.
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type LoggingManager interface {
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// ServiceLog privides a log handler for a given service (that may not exist).
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ServiceLog(service string) LogHandler
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// SetSenders sets log senders for all derived log handlers
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// and returns the previous ones for closing.
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//
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// SetSenders should be thread-safe.
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SetSenders(senders []LogSender) []LogSender
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}
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// LogOptions for LogHandler.Reader.
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type LogOptions struct {
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Follow bool
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TailLines *int
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}
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// LogOption provides functional options for LogHandler.Reader.
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type LogOption func(*LogOptions) error
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// WithFollow enables follow mode for the logs.
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func WithFollow() LogOption {
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return func(o *LogOptions) error {
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o.Follow = true
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return nil
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}
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}
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// WithTailLines starts log reading from lines from the tail of the log.
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func WithTailLines(lines int) LogOption {
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return func(o *LogOptions) error {
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o.TailLines = &lines
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return nil
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}
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}
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// LogHandler provides interface to access particular log source.
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type LogHandler interface {
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Writer() (io.WriteCloser, error)
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Reader(opt ...LogOption) (io.ReadCloser, error)
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}
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// LogEvent represents a log message to be send.
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type LogEvent struct {
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Msg string
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Time time.Time
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Level zapcore.Level
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Fields map[string]interface{}
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}
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// ErrDontRetry indicates that log event should not be resent.
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var ErrDontRetry = fmt.Errorf("don't retry")
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// LogSender provides common interface for log senders.
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type LogSender interface {
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// Send tries to send the log event once, exiting on success, error, or context cancelation.
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//
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// Returned error is nil on success, non-nil otherwise.
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// As a special case, Send can return (possibly wrapped) ErrDontRetry if the log event should not be resent
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// (if it is invalid, if it was sent partially, etc).
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//
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// Send should be thread-safe.
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Send(ctx context.Context, e *LogEvent) error
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// Close stops the sender gracefully if possible, or forcefully on context cancelation.
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//
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// Close should be thread-safe.
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Close(ctx context.Context) error
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}
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