4 Commits (4451a7c3643bc7375b26f6f00952131f5fb64446)

Author	SHA1	Message	Date
Will Norris	71029cea2d	all: update copyright and license headers ... This updates all source files to use a new standard header for copyright and license declaration. Notably, copyright no longer includes a date, and we now use the standard SPDX-License-Identifier header. This commit was done almost entirely mechanically with perl, and then some minimal manual fixes. Updates #6865 Signed-off-by: Will Norris <will@tailscale.com>	2 years ago
Joe Tsai	350aab05e5	util/multierr: optimize New for nil cases (#6750) ... Consider the following pattern: err1 := foo() err2 := bar() err3 := baz() return multierr.New(err1, err2, err3) If err1, err2, and err3 are all nil, then multierr.New should not allocate. Thus, modify the logic of New to count the number of distinct error values and allocate the exactly needed slice. This also speeds up non-empty error situation since repeatedly growing with append is slow. Performance: name old time/op new time/op delta Empty-24 41.8ns ± 2% 6.4ns ± 1% -84.73% (p=0.000 n=10+10) NonEmpty-24 120ns ± 3% 69ns ± 1% -42.01% (p=0.000 n=9+10) name old alloc/op new alloc/op delta Empty-24 64.0B ± 0% 0.0B -100.00% (p=0.000 n=10+10) NonEmpty-24 168B ± 0% 88B ± 0% -47.62% (p=0.000 n=10+10) name old allocs/op new allocs/op delta Empty-24 1.00 ± 0% 0.00 -100.00% (p=0.000 n=10+10) NonEmpty-24 3.00 ± 0% 2.00 ± 0% -33.33% (p=0.000 n=10+10) Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Joe Tsai	c47578b528	util/multierr: add Range (#6643) ... Errors in Go are no longer viewed as a linear chain, but a tree. See golang/go#53435. Add a Range function that iterates through an error in a pre-order, depth-first order. This matches the iteration order of errors.As in Go 1.20. This adds the logic (but currently commented out) for having Error implement the multi-error version of Unwrap in Go 1.20. It is commented out currently since it causes "go vet" to complain about having the "wrong" signature. Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Josh Bleecher Snyder	3fd5f4380f	util/multierr: new package ... github.com/go-multierror/multierror served us well. But we need a few feature from it (implement Is), and it's not worth maintaining a fork of such a small module. Instead, I did a clean room implementation inspired by its API. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago