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52 lines
2.2 KiB
Go
52 lines
2.2 KiB
Go
package log
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import (
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"github.com/go-kit/log"
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)
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// Logger is the fundamental interface for all log operations. Log creates a
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// log event from keyvals, a variadic sequence of alternating keys and values.
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// Implementations must be safe for concurrent use by multiple goroutines. In
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// particular, any implementation of Logger that appends to keyvals or
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// modifies or retains any of its elements must make a copy first.
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type Logger = log.Logger
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// ErrMissingValue is appended to keyvals slices with odd length to substitute
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// the missing value.
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var ErrMissingValue = log.ErrMissingValue
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// With returns a new contextual logger with keyvals prepended to those passed
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// to calls to Log. If logger is also a contextual logger created by With,
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// WithPrefix, or WithSuffix, keyvals is appended to the existing context.
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//
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// The returned Logger replaces all value elements (odd indexes) containing a
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// Valuer with their generated value for each call to its Log method.
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func With(logger Logger, keyvals ...interface{}) Logger {
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return log.With(logger, keyvals...)
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}
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// WithPrefix returns a new contextual logger with keyvals prepended to those
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// passed to calls to Log. If logger is also a contextual logger created by
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// With, WithPrefix, or WithSuffix, keyvals is prepended to the existing context.
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//
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// The returned Logger replaces all value elements (odd indexes) containing a
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// Valuer with their generated value for each call to its Log method.
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func WithPrefix(logger Logger, keyvals ...interface{}) Logger {
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return log.WithPrefix(logger, keyvals...)
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}
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// WithSuffix returns a new contextual logger with keyvals appended to those
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// passed to calls to Log. If logger is also a contextual logger created by
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// With, WithPrefix, or WithSuffix, keyvals is appended to the existing context.
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//
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// The returned Logger replaces all value elements (odd indexes) containing a
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// Valuer with their generated value for each call to its Log method.
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func WithSuffix(logger Logger, keyvals ...interface{}) Logger {
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return log.WithSuffix(logger, keyvals...)
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}
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// LoggerFunc is an adapter to allow use of ordinary functions as Loggers. If
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// f is a function with the appropriate signature, LoggerFunc(f) is a Logger
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// object that calls f.
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type LoggerFunc = log.LoggerFunc
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