Now that we're using rand.Shuffle in a few locations, create a generic
shuffle function and use it instead. While we're at it, move the
interleaveSlices function to the same package for use.
Signed-off-by: Andrew Dunham <andrew@du.nham.ca>
Change-Id: I0b00920e5b3eea846b6cedc30bd34d978a049fd3
This is to address a possible DNS failure on startup. Before this
change IPv6 addresses would be listed first, and the client dialer would
fail for hosts without IPv6 connectivity.
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>
The commit b9c92b90db earlier today
caused a regression of serving an empty map always, as it was
JSON marshalling an atomic.Value instead of the DNS entries map
it just built.
Change-Id: I9da3eeca132c6324462dedeaa7d002908557384b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
Didn't help enough. We are setting another header anyway. Restore it.
This reverts commit 60abeb027b.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
No one really cares. Its cost outweighs its usefulness.
name old time/op new time/op delta
HandleBootstrapDNS-10 105ns ± 4% 65ns ± 2% -37.68% (p=0.000 n=15+14)
name old alloc/op new alloc/op delta
HandleBootstrapDNS-10 416B ± 0% 0B -100.00% (p=0.000 n=15+15)
name old allocs/op new allocs/op delta
HandleBootstrapDNS-10 3.00 ± 0% 0.00 -100.00% (p=0.000 n=15+15)
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
Do json formatting once, rather than on every request.
Use an atomic.Value.
name old time/op new time/op delta
HandleBootstrapDNS-10 6.35µs ± 0% 0.10µs ± 4% -98.35% (p=0.000 n=14+15)
name old alloc/op new alloc/op delta
HandleBootstrapDNS-10 3.20kB ± 0% 0.42kB ± 0% -86.99% (p=0.000 n=12+15)
name old allocs/op new allocs/op delta
HandleBootstrapDNS-10 41.0 ± 0% 3.0 ± 0% -92.68% (p=0.000 n=15+15)
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
For option (d) of #1405.
For an HTTPS request of /bootstrap-dns, this returns e.g.:
{
"log.tailscale.io": [
"2600:1f14:436:d603:342:4c0d:2df9:191b",
"34.210.105.16"
],
"login.tailscale.com": [
"2a05:d014:386:203:f8b4:1d5a:f163:e187",
"3.121.18.47"
]
}
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
