tailscale

Commit Graph

Author	SHA1	Message	Date
Joe Tsai	1a78f240b5	tstime: add DefaultClock (#9691 ) In almost every single use of Clock, there is a default behavior we want to use when the interface is nil, which is to use the the standard time package. The Clock interface exists only for testing, and so tests that care about mocking time can adequately plumb the the Clock down the stack and through various data structures. However, the problem with Clock is that there are many situations where we really don't care about mocking time (e.g., measuring execution time for a log message), where making sure that Clock is non-nil is not worth the burden. In fact, in a recent refactoring, the biggest pain point was dealing with nil-interface panics when calling tstime.Clock methods where mocking time wasn't even needed for the relevant tests. This required wasted time carefully reviewing the code to make sure that tstime.Clock was always populated, and even then we're not statically guaranteed to avoid a nil panic. Ideally, what we want are default methods on Go interfaces, but such a language construct does not exist. However, we can emulate that behavior by declaring a concrete type that embeds the interface. If the underlying interface value is nil, it provides some default behavior (i.e., use StdClock). This provides us a nice balance of two goals: * We can plumb tstime.DefaultClock in all relevant places for use with mocking time in the tests that care. * For all other logic that don't care about, we never need to worry about whether tstime.DefaultClock is nil or not. This is especially relevant in production code where we don't want to panic. Longer-term, we may want to perform a large-scale change where we rename Clock to ClockInterface and rename DefaultClock to just Clock. Updates #cleanup Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 year ago
Claire Wang	0573f6e953	tstime: add Since method (#8622 ) Updates #8463 Signed-off-by: Claire Wang <claire@tailscale.com>	1 year ago
Adrian Dewhurst	92fb80d55f	tstest, tstime: mockable timers and tickers This change introduces tstime.Clock which is the start of a mockable interface for use with testing other upcoming code changes. Fixes #8463 Change-Id: I59eabc797828809194575736615535d918242ec4 Signed-off-by: Adrian Dewhurst <adrian@tailscale.com>	1 year ago
Joe Tsai	7e6c5a2db4	tstime: rely on stdlib parse functionality (#7482 ) The time.Parse function has been optimized to the point where it is faster than our custom implementation. See upstream changes in: * https://go.dev/cl/429862 * https://go.dev/cl/425197 * https://go.dev/cl/425116 Performance: BenchmarkGoParse3339/Z 38.75 ns/op 0 B/op 0 allocs/op BenchmarkGoParse3339/TZ 54.02 ns/op 0 B/op 0 allocs/op BenchmarkParse3339/Z 40.17 ns/op 0 B/op 0 allocs/op BenchmarkParse3339/TZ 87.06 ns/op 0 B/op 0 allocs/op We can see that the stdlib implementation is now faster. Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Joe Tsai	9112e78925	tstime: add Sleep (#7480 ) Sleep is an interruptible sleep variation. Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
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	ec1e67b1ab	tstime: fix ParseDuration for '6' digit (#6363 ) The cutset provided to strings.TrimRight was missing the digit '6', making it such that we couldn't parse something like "365d". Signed-off-by: Joe Tsai <joetsai@digital-static.net>	2 years ago
Mihai Parparita	9214b293e3	tstime: add ParseDuration helper function More expressive than time.ParseDuration, also accepting d (days) and w (weeks) literals. Signed-off-by: Mihai Parparita <mihai@tailscale.com>	2 years ago
Josh Bleecher Snyder	aa9d7f4665	tstime: add Parse3339B, for byte slices Use go4.org/mem for memory safety. A slight performance hit, but a huge performance win for clients who start with a []byte. The perf hit is due largely to the MapHash call, which adds ~25ns. That is necessary to keep the fast path allocation-free. name old time/op new time/op delta GoParse3339/Z-8 281ns ± 1% 283ns ± 2% ~ (p=0.366 n=9+9) GoParse3339/TZ-8 509ns ± 0% 510ns ± 1% ~ (p=0.059 n=9+9) GoParse3339InLocation-8 330ns ± 1% 330ns ± 0% ~ (p=0.802 n=10+6) Parse3339/Z-8 69.3ns ± 1% 74.4ns ± 1% +7.45% (p=0.000 n=9+10) Parse3339/TZ-8 110ns ± 1% 140ns ± 3% +27.42% (p=0.000 n=9+10) ParseInt-8 8.20ns ± 1% 8.17ns ± 1% ~ (p=0.452 n=9+9) name old alloc/op new alloc/op delta GoParse3339/Z-8 0.00B 0.00B ~ (all equal) GoParse3339/TZ-8 160B ± 0% 160B ± 0% ~ (all equal) GoParse3339InLocation-8 0.00B 0.00B ~ (all equal) Parse3339/Z-8 0.00B 0.00B ~ (all equal) Parse3339/TZ-8 0.00B 0.00B ~ (all equal) name old allocs/op new allocs/op delta GoParse3339/Z-8 0.00 0.00 ~ (all equal) GoParse3339/TZ-8 3.00 ± 0% 3.00 ± 0% ~ (all equal) GoParse3339InLocation-8 0.00 0.00 ~ (all equal) Parse3339/Z-8 0.00 0.00 ~ (all equal) Parse3339/TZ-8 0.00 0.00 ~ (all equal) Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
David Anderson	b925e18f70	tstime: hand-implement parseInt for specific needs of rfc3339 parsing. Makes parsing 4.6x faster. name old time/op new time/op delta ParseInt-12 32.1ns ± 1% 6.9ns ± 2% -78.55% (p=0.000 n=10+9) Signed-off-by: David Anderson <danderson@tailscale.com>	5 years ago
Brad Fitzpatrick	febdac0499	tstime: write Parse3339 parse that doesn't use time.Parse It doesn't allocate and it's half the time of time.Parse (which allocates), and 2/3rds the time of time.ParseInLocation (which doesn't). Go with a UTC time: BenchmarkGoParse3339/Z-8 2200995 534 ns/op 0 B/op 0 allocs/op BenchmarkGoParse3339/Z-8 2254816 554 ns/op 0 B/op 0 allocs/op BenchmarkGoParse3339/Z-8 2159504 522 ns/op 0 B/op 0 allocs/op Go allocates with a "-08:00" suffix instead of ending in "Z": BenchmarkGoParse3339/TZ-8 1276491 884 ns/op 144 B/op 3 allocs/op BenchmarkGoParse3339/TZ-8 1355858 942 ns/op 144 B/op 3 allocs/op BenchmarkGoParse3339/TZ-8 1385484 911 ns/op 144 B/op 3 allocs/op Go doesn't allocate if you use time.ParseInLocation, but then you need to parse the string to find the location anyway, so might as well go all the way (below). BenchmarkGoParse3339InLocation-8 1912254 597 ns/op 0 B/op 0 allocs/op BenchmarkGoParse3339InLocation-8 1980043 612 ns/op 0 B/op 0 allocs/op BenchmarkGoParse3339InLocation-8 1891366 612 ns/op 0 B/op 0 allocs/op Parsing RFC3339 ourselves, UTC: BenchmarkParse3339/Z-8 3889220 307 ns/op 0 B/op 0 allocs/op BenchmarkParse3339/Z-8 3718500 309 ns/op 0 B/op 0 allocs/op BenchmarkParse3339/Z-8 3621231 303 ns/op 0 B/op 0 allocs/op Parsing RFC3339 ourselves, with timezone (w/ *time.Location fetched from sync.Map) BenchmarkParse3339/TZ-8 3019612 418 ns/op 0 B/op 0 allocs/op BenchmarkParse3339/TZ-8 2921618 401 ns/op 0 B/op 0 allocs/op BenchmarkParse3339/TZ-8 3031671 408 ns/op 0 B/op 0 allocs/op Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	d503dee6f1	tstime: add new package for time utilities, starting with Parse3339 Go's time.Parse always allocates a FixedZone for time strings not in UTC (ending in "Z"). This avoids that allocation, at the cost of adding a cache. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago

12 Commits (0f3a292ebde93c9508f230e1b0b49f22a80b4c62)