Ctx constructs a Context from ctx with fn as its custom log function.

Discard is a Logf that throws away the logs given to it.

Filtered returns a Logf that silently swallows some log lines.

FromContext extracts a log function from ctx.

FuncWriter returns an io.Writer that writes to f.

LogfCloser wraps logf to create a logger that can be closed.

LogOnChange logs a given line only if line != lastLine, or if maxInterval has passed since the last time this identical line was logged.

RateLimitedFn is a wrapper for RateLimitedFnWithClock that includes the current time automatically.

RateLimitedFnWithClock returns a rate-limiting Logf wrapping the given logf.

RusagePrefixLog returns a Logf func wrapping the provided logf func that adds a prefixed log message to each line with the current binary memory usage and max RSS.

StdLogger returns a standard library logger from a Logf.

WithPrefix wraps f, prefixing each format with the provided prefix.

ArgWriter is a fmt.Formatter that can be passed to any Logf func to efficiently write to a %v argument without allocations.

A Context is a context.Context that should contain a custom log function, obtainable from FromContext.

Logf is the basic Tailscale logger type: a printf-like func.