For use in tsweb debug handlers, so that we can easily inspect cache
and limiter state when troubleshooting.
Updates tailscale/corp#3601
Signed-off-by: David Anderson <danderson@tailscale.com>
pre-generics container/list is quite unpleasant to use, and the pointer
manipulation operations for an LRU are simple enough to implement directly
now that we have generic types.
With this change, the LRU uses a ring (aka circularly linked list) rather
than a simple doubly-linked list as its internals, because the ring makes
list manipulation edge cases more regular: the only remaining edge case is
the transition between 0 and 1 elements, rather than also having to deal
specially with manipulating the first and last members of the list.
While the primary purpose was improved readability of the code, as it
turns out removing the indirection through an interface box also speeds
up the LRU:
│ before.txt │ after.txt │
│ sec/op │ sec/op vs base │
LRU-32 67.05n ± 2% 59.73n ± 2% -10.90% (p=0.000 n=20)
│ before.txt │ after.txt │
│ B/op │ B/op vs base │
LRU-32 21.00 ± 0% 10.00 ± 0% -52.38% (p=0.000 n=20)
│ before.txt │ after.txt │
│ allocs/op │ allocs/op vs base │
LRU-32 0.000 ± 0% 0.000 ± 0% ~ (p=1.000 n=20) ¹
Updates #cleanup
Signed-off-by: David Anderson <danderson@tailscale.com>
The benchmark simulates an LRU being queries with uniformly random
inputs, in a set that's too large for the LRU, which should stress
the eviction codepath.
Signed-off-by: David Anderson <danderson@tailscale.com>
This makes wsconn.Conns somewhat present reasonably when they are
the client of an http.Request, rather than just put a placeholder
in that field.
Updates tailscale/corp#13777
Signed-off-by: David Anderson <danderson@tailscale.com>
The previous change just switched the Go version used in the dev
environment (for use with e.g. direnv), not the version used for
the distribution build. Oops.
Updates #cleanup
Signed-off-by: David Anderson <danderson@tailscale.com>
Fly apps all set X-Forwarded-For, which breaks debug access even
with a preshared key otherwise.
Updates tailscale/corp#3601
Signed-off-by: David Anderson <danderson@tailscale.com>
Values are still turned into pointers internally to maintain the
invariants of strideTable, but from the user's perspective it's
now possible to tbl.Insert(pfx, true) rather than
tbl.Insert(pfx, ptr.To(true)).
Updates #7781
Signed-off-by: David Anderson <danderson@tailscale.com>
In preparation for a different refactor, but incidentally also saves
10-25% memory on overall table size in benchmarks.
Updates #7781
Signed-off-by: David Anderson <danderson@tailscale.com>
Every time I use WhoIsResponse I end up writing mildly irritating nil-checking
for both Node and UserProfile, but it turns out our code guarantees that both
are non-nil in successful whois responses.
Updates #cleanup
Signed-off-by: David Anderson <danderson@tailscale.com>
One is a straight "I forgot how to Go" bug, the others are semantic
mismatches with the main implementation around masking the prefixes
passed to insert/delete.
Updates #7781
Signed-off-by: David Anderson <danderson@tailscale.com>
This is a prerequisite for path compression, so that insert/delete
can determine when compression occurred.
Updates #7781
Signed-off-by: David Anderson <danderson@tailscale.com>
Also switch the wrapper script to use bash not posix shell. We now
depend on bash elsewhere for saner behavior in esoteric areas, so
might as well use it everywhere for consistency.
Fixes#8425
Signed-off-by: David Anderson <danderson@tailscale.com>
As far as I can tell from the DSM documentation and known undocumented
fields, there is no 'version' field in this config file that DSM cares
about.
Updates #8232
Signed-off-by: David Anderson <danderson@tailscale.com>
This platform is technically an armv7, but has no hardware floating
point unit. armv5 is the only target Go understands to lack floating
point, so use that.
Updates #6860
Signed-off-by: David Anderson <danderson@tailscale.com>
Some builders return absolute paths to build products already. When that
happens, the manifest writing logic shouldn't tack on another absolute
prefix.
Signed-off-by: David Anderson <danderson@tailscale.com>
The subshell in which gocross gets built cd's to the corp checkout dir
near the top, so all future references to corp repository files should
be simple relative paths, and not reference $repo_root. When $repo_root
is an absolute path, it doesn't matter and everything works out, but on
some OSes and shells and invocations, $repo_root is a completely relative
path that is invalidated by the "cd".
Fixestailscale/corp#11183
Signed-off-by: David Anderson <danderson@tailscale.com>
At the current unoptimized memory utilization of the various data structures,
100k IPv6 routes consumes in the ballpark of 3-4GiB, which risks OOMing our
386 test machine.
Until we have the optimizations to (drastically) reduce that consumption,
skip the test that bloats too much for 32-bit machines.
Signed-off-by: David Anderson <danderson@tailscale.com>
Previously, the build ended up embedding an empty string, which made
the shell wrapper rebuild gocross on every invocation. This is still
reasonably fast, but fixing the bypass shaves 80% off gocross's overhead
when no rebuild is needed.
Signed-off-by: David Anderson <danderson@tailscale.com>
A bunch of us invoke tool/go from outside the repo that hosts gocross,
as a way of accessing our version-controlled toolchain. This removes
assumptions from gocross that it's being invoked within the repository
that contains its source code and toolchain configuration.
Fixestailscale/corp#9627
Signed-off-by: David Anderson <danderson@tailscale.com>
This used to make sense, but after a refactor somewhere along the line
this results in trying to download from a malformed URL and generally
confusing failures.
Signed-off-by: David Anderson <danderson@tailscale.com>
Xcode changed how/what data it exports to build steps at some point
recently, so our old way of figuring out the minimum support version
for clang stopped working.
Updates tailscale/corp#4095
Signed-off-by: David Anderson <danderson@tailscale.com>
Sometimes, our cached toolchain ends up being an older version of
Go, older than our go.mod allows. In that scenario, gocross-wrapper.sh
would find a usable toolchain, but then fail to compile gocross.
This change makes the wrapper script check that the cached toolchain's
minor version is good enough to build tailscale.com, and re-bootstraps
in shell if not.
Signed-off-by: David Anderson <danderson@tailscale.com>
I thought our versioning scheme would make go.mod include a commit hash
even on stable builds. I was wrong. Fortunately, the rest of this code
wants anything that 'git rev-parse' understands (to convert it into a full
git hash), and tags qualify.
Signed-off-by: David Anderson <danderson@tailscale.com>
By default, cmd/dist only prints the output of failed commands.
With this, you can turn all the noisy output back on.
Updates tailscale/corp#9045
Signed-off-by: David Anderson <danderson@tailscale.com>
The helper suppresses output if the command runs successfully. If the
command fails, it dumps the buffered output to stdout before returning
the error. This means the happy path isn't swamped by debug noise or
xcode being intensely verbose about what kind of day it's having,
but you still get debug output when something goes wrong.
Updates tailscale/corp#9045
Signed-off-by: David Anderson <danderson@tailscale.com>
Github requires explicitly listing every single job within a workflow
that is required for status checks, instead of letting you list entire
workflows. This is ludicrous, and apparently this nonsense is the
workaround.
Signed-off-by: David Anderson <danderson@tailscale.com>
This makes gocross and its bootstrap script understand an absolute
path in go.toolchain.rev to mean "use the given toolchain directly".
Signed-off-by: David Anderson <danderson@tailscale.com>
We need to build gocross from multiple repos, but Go's innate
git hash embedding only works when you build gocross from this repo,
not when you build it from elsewhere via 'go build
tailscale.com/tool/gocross'. Instead, explicitly embed the version
found with 'git rev-parse HEAD', which will work from any git repo.
Signed-off-by: David Anderson <danderson@tailscale.com>
This avoids accidentally overwriting variables from the input
environment, which might non-deterministically change the behavior
of gocross.
Signed-off-by: David Anderson <danderson@tailscale.com>
Turns out directing the printed script into the bootstrap location leads
to irritating "text file busy" problems and then having to muck about with
tempfiles and chmod and all that. Instead, have gocross write everything
with the right values.
Signed-off-by: David Anderson <danderson@tailscale.com>
So that when importing and using gocross from other repos, there's
an easy way to get at the right wrapper script that's in sync with
the gocross binary.
Signed-off-by: David Anderson <danderson@tailscale.com>
trimmed builds don't have absolute path information in executable
metadata, which leads the runtime.Caller approach failing
mysteriously in yarn with complaints about relative package paths.
So, instead of using embedded package metadata to find paths,
expect that we're being invoked within the tailscale repo, and
locate the tsconnect directory that way.
Signed-off-by: David Anderson <danderson@tailscale.com>
CI status doesn't collapse into "everything OK" if a job gets
skipped. Instead, always run the job, but skip its only step in PRs.
Signed-off-by: David Anderson <danderson@tailscale.com>
Replaces the former shell goop, which was a shell reimplementation
of a subset of version/mkversion.
Signed-off-by: David Anderson <danderson@tailscale.com>
With this change, you can collect version info from either a git
checkout of the tailscale.com Go module (this repo), or a git
checkout of a repo that imports the tailscale.com Go module.
Signed-off-by: David Anderson <danderson@tailscale.com>
So that I just get a quick PR to approve and merge instead of
periodically discovering that the SRI hash has bitrotted.
Signed-off-by: David Anderson <danderson@tailscale.com>
OSS-Fuzz doesn't update their version of Go as quickly as we do, so
we sometimes end up with OSS-Fuzz being unable to build our code for
a few weeks. We don't want CI to be red for that entire time, but
we also don't want to forget to reenable fuzzing when OSS-Fuzz does
start working again.
This change makes two configurations worthy of a CI pass:
- Fuzzing works, and we expected it to work. This is a normal
happy state.
- Fuzzing didn't compile, and we expected it to not compile. This
is the "OSS-Fuzz temporarily broken" state.
If fuzzing is unexpectedly broken, or unexpectedly not broken, that's
a CI failure because we need to either address a fuzz finding, or
update TS_FUZZ_CURRENTLY_BROKEN to reflect the state of OSS-Fuzz.
Signed-off-by: David Anderson <danderson@tailscale.com>
Github's matrix runner formats the race variant as '(amd64, true)' if we
use race=true. So, change the way the variable is defined so that it says
'(amd64, race)' even if that makes the if statements a bit more complex.
Signed-off-by: David Anderson <danderson@tailscale.com>
Instead of having a dozen files that contribute CI steps with
inconsistent configs, this one file lists out everything that,
for us, constitutes "a CI run". It also enables the slack
notification webhook to notify us exactly once on a mass breakage,
rather than once for every sub-job that fails.
Signed-off-by: David Anderson <danderson@tailscale.com>
The use of GOOS to mean "the compiler's host architecture" ends up
overriding whatever GOOS the user passed in, resulting in befuddling
errors like "unsupported GOOS/GOARCH pair linux/wasm" when the caller
requests js/wasm.
Signed-off-by: David Anderson <danderson@tailscale.com>
We've never used the "[ci skip]" magic commit header in our history,
across all our repos. This seems to be boilerplate we imported years
ago and have since been copying around our CI configs.
Signed-off-by: David Anderson <danderson@tailscale.com>
In the switch to static toolchains, we removed a legacy oddity from the
toolchain URL structure, but forgot to update printdep.
Signed-off-by: David Anderson <danderson@tailscale.com>
Before (note attempted use of absent date and commit hash):
"short": "1.37.0-dev",
"long": "1.37.0-dev-t",
After:
"short": "1.37.0-ERR-BuildInfo",
"long": "1.37.0-ERR-BuildInfo",
Signed-off-by: David Anderson <danderson@tailscale.com>
