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>
