tailscale

Commit Graph

Author	SHA1	Message	Date
Josh Bleecher Snyder	0c038b477f	logtail: add a re-usable buffer for uploads This avoids a per-upload alloc (which in practice often means per-log-line), up to 4k. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Josh Bleecher Snyder	278e7de9c9	logtail: always send a json array The code goes to some effort to send a single JSON object when there's only a single line and a JSON array when there are multiple lines. It makes the code more complex and more expensive; when we add a second line, we have to use a second buffer to duplicate the first one after adding a leading square brackets. The savings come to two bytes. Instead, always send an array. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Josh Bleecher Snyder	93284209bc	logtail/filch: preallocate a scanner buffer Scanning log lines is a frequent source of allocations. Pre-allocate a re-usable buffer. This still doesn't help when there are giant log lines. Those will still be problematic from an iOS memory perspective. For more on that, see https://github.com/tailscale/corp/issues/2423. (For those who cannot follow that link, it is a discussion of particular problematic types of log lines for particular categories of customers. The "categories of customers" part is the reason that it is a private issue.) There is also a latent bug here. If we ever encounter a log line longer than bufio.MaxScanTokenSize, then bufio.Scan will return an error, and we'll truncate the file and discard the rest of the log. That's not good, but bufio.MaxScanTokenSize is really big, so it probably doesn't matter much in practice now. Unfortunately, it does prevent us from easily capping the potential memory usage here, on pain of losing log entries. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Josh Bleecher Snyder	a5da4ed981	all: gofmt with Go 1.17 This adds "//go:build" lines and tidies up existing "// +build" lines. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
Josh Bleecher Snyder	0373ba36f3	logtail: fix typo in comment Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	3 years ago
David Crawshaw	1606ef5219	logtail: print panics from previous runs on stderr Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	3 years ago
David Crawshaw	297b3d6fa4	staticcheck.conf: turn off noisy lint errors Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	3 years ago
Josh Bleecher Snyder	bb8ce48a6b	logtail: allow changing log level concurrently When tailscaled starts up, these lines run: func run() error { // ... pol := logpolicy.New("tailnode.log.tailscale.io") pol.SetVerbosityLevel(args.verbose) // ... } If there are old log entries present, they immediate start getting uploaded. This races with the call to pol.SetVerbosityLevel. This manifested itself as a test failure in tailscale.com/tstest/integration when run with -race: WARNING: DATA RACE Read at 0x00c0001bc970 by goroutine 24: tailscale.com/logtail.(Logger).Write() /Users/josh/t/corp/oss/logtail/logtail.go:517 +0x27c log.(Logger).Output() /Users/josh/go/ts/src/log/log.go:184 +0x2b8 log.Printf() /Users/josh/go/ts/src/log/log.go:323 +0x94 tailscale.com/logpolicy.newLogtailTransport.func1() /Users/josh/t/corp/oss/logpolicy/logpolicy.go:509 +0x36c net/http.(Transport).dial() /Users/josh/go/ts/src/net/http/transport.go:1168 +0x238 net/http.(Transport).dialConn() /Users/josh/go/ts/src/net/http/transport.go:1606 +0x21d0 net/http.(Transport).dialConnFor() /Users/josh/go/ts/src/net/http/transport.go:1448 +0xe4 Previous write at 0x00c0001bc970 by main goroutine: tailscale.com/logtail.(Logger).SetVerbosityLevel() /Users/josh/t/corp/oss/logtail/logtail.go:131 +0x98 tailscale.com/logpolicy.(Policy).SetVerbosityLevel() /Users/josh/t/corp/oss/logpolicy/logpolicy.go:463 +0x60 main.run() /Users/josh/t/corp/oss/cmd/tailscaled/tailscaled.go:178 +0x50 main.main() /Users/josh/t/corp/oss/cmd/tailscaled/tailscaled.go:163 +0x71c Goroutine 24 (running) created at: net/http.(Transport).queueForDial() /Users/josh/go/ts/src/net/http/transport.go:1417 +0x4d8 net/http.(Transport).getConn() /Users/josh/go/ts/src/net/http/transport.go:1371 +0x5b8 net/http.(Transport).roundTrip() /Users/josh/go/ts/src/net/http/transport.go:585 +0x7f4 net/http.(Transport).RoundTrip() /Users/josh/go/ts/src/net/http/roundtrip.go:17 +0x30 net/http.send() /Users/josh/go/ts/src/net/http/client.go:251 +0x4f0 net/http.(Client).send() /Users/josh/go/ts/src/net/http/client.go:175 +0x148 net/http.(Client).do() /Users/josh/go/ts/src/net/http/client.go:717 +0x1d0 net/http.(Client).Do() /Users/josh/go/ts/src/net/http/client.go:585 +0x358 tailscale.com/logtail.(Logger).upload() /Users/josh/t/corp/oss/logtail/logtail.go:367 +0x334 tailscale.com/logtail.(Logger).uploading() /Users/josh/t/corp/oss/logtail/logtail.go:289 +0xec Rather than complicate the logpolicy API, allow the verbosity to be adjusted concurrently. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	61e411344f	logtail/filch: add staticcheck annotation To work around a staticcheck bug when running with GOOS=windows. Signed-off-by: Josh Bleecher Snyder <josharian@gmail.com>	4 years ago
Brad Fitzpatrick	b34fbb24e8	logtail: reduce PublicID.UnmarshalText from 2 allocs to 0 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	b4cf837d8a	logtail: use link monitor to determine when to retry after upload failure Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	c0cdca6d06	cmd/tailscaled, logtail: share link monitor from wgengine to logtail Part of overall effort to clean up, unify, use link monitoring more, and make Tailscale quieter when all networks are down. This is especially bad on macOS where we can get killed for not being polite it seems. (But we should be polite in any case) Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Denton Gentry	013da6660e	logtail: add tests + add a test for parseAndRemoveLogLevel() + add a test for drainPendingMessages() + test JSON log encoding including several special cases Other tests frequently send logs but a) don't check the result and b) do so by happenstance, such that the code in encode() was not consistently being exercised and leading to spurious changes in code coverage. These tests attempt to more systematically test the logging function. This is the second attempt to add these tests, the first attempt (in https://github.com/tailscale/tailscale/pull/1114) had two issues: 1. httptest.NewServer creates multiple goroutine handlers, and logtail uses goroutines to upload, but the first version had no locking in the server to guard this. Moved data handling into channels to get synchronization. 2. The channel to notify the test of the arrival of data had a depth of 1, in cases where the Logger sent multiple uploads it would block the server. This resulted in the first iteration of these tests being flaky, and we reverted it. This new version of the tests has passed with go test -race -count=10000 and seems solid. Signed-off-by: Denton Gentry <dgentry@tailscale.com>	4 years ago
Denton Gentry	ce058c8280	Revert "Add logtail tests (#1114 )" (#1116 ) This reverts commit `e4f53e9b6f`. At least two of these tests are flakey, reverting until they can be made more robust. Signed-off-by: Denton Gentry <dgentry@tailscale.com>	4 years ago
Denton Gentry	e4f53e9b6f	Add logtail tests (#1114 ) * logtail: test parseAndRemoveLogLevel() Signed-off-by: Denton Gentry <dgentry@tailscale.com> * logtail: test JSON log encoding. Expand TestUploadMessages to also exercise the encoding functions in logtail, like JSON logging and timestamps. Other tests frequently send logs but a) don't check the result and b) do so by happenstance, such that the lines in encode() were not consistently being exercised and leading to spurious changes in code coverage. Signed-off-by: Denton Gentry <dgentry@tailscale.com> * logtail: add a test for drainPendingMessages Make the client buffer some messages before the upload server becomes available. Signed-off-by: Denton Gentry <dgentry@tailscale.com> * logtail: use %q, raw strings, and io.WriteString %q escapes binary characters for us. raw strings avoid so much backslash escaping Signed-off-by: Denton Gentry <dgentry@tailscale.com>	4 years ago
Denton Gentry	b771a1363b	logtail: start a local server for TestFastShutdown Right now TestFastShutdown tries to upload logs to localhost:1234, which will most likely respond with an error. However if one has an actual service running on port 1234, it would receive a connection attempting to POST every time the unit test runs. Start a local server and direct the upload there instead. Signed-off-by: Denton Gentry <dgentry@tailscale.com>	4 years ago
Denton Gentry	2c328da094	logtail: add a test to upload logs to local server Start an HTTP server to accept POST requests, and upload some logs to it. Check that uploaded logs were received. Code in logtail:drainPending was not being reliably exercised by other tests. This shows up in code coverage reports, as lines of code in drainPending are alternately added and subtracted from code coverage. This test will reliably exercise and verify this code. Signed-off-by: Denton Gentry <dgentry@tailscale.com>	4 years ago
Brad Fitzpatrick	d6e9fb1df0	all: adjust Unix permissions for those without umasks Fixes tailscale/corp#1165 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	57dd247376	cmd/tailscaled, logpolicy, logtail: support log levels Log levels can now be specified with "[v1] " or "[v2] " substrings that are then stripped and filtered at the final logger. This follows our existing "[unexpected]" etc convention and doesn't require a wholesale reworking of our logging at the moment. cmd/tailscaled then gets a new --verbose=N flag to take a log level that controls what gets logged to stderr (and thus systemd, syslog, etc). Logtail is unaffected by --verbose. This commit doesn't add annotations to any existing log prints. That is in the next commit. Updates #924 Updates #282 Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Brad Fitzpatrick	d97ee12179	logtail, logpolicy: remove an unidiomatic use of an interface	4 years ago
Josh Bleecher Snyder	3a7402aa2d	logtail: help the server be more efficient Add content length hints to headers. The server can use these hints to more efficiently select buffers. Stop attempting to compress tiny requests. The bandwidth savings are negligible (and sometimes negative!), and it makes extra work for the server. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Josh Bleecher Snyder	883a11f2a8	logtail: fix typo in comment Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Brad Fitzpatrick	7a2a3955d3	logtail/filch: skip a broken test on Windows Add a TODO with some notes about why it's skipped for now. Updates #50	4 years ago
Josh Bleecher Snyder	585a0d8997	all: use testing.T.TempDir Bit of Friday cleanup. Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>	4 years ago
Brad Fitzpatrick	dd97111d06	backoff: update to Go style, document a bit, make 30s explicit Also, bit of behavior change: on non-nil err but expired context, don't reset the consecutive failure count. I don't think the old behavior was intentional. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	4 years ago
Elias Naur	bca9fe35ba	logtail: return correct write size from logger.Write Signed-off-by: Elias Naur <mail@eliasnaur.com>	4 years ago
Avery Pennarun	6f590f5b52	logtail: we missed a case for the backoff timer. We want to run bo.Backoff() after every upload, regardless. If upload==true but err!=nil, we weren't backing off, which caused some very-high-throughput log upload retries in bad network conditions. Updates #282. Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>	5 years ago
Avery Pennarun	5eb09c8f5e	filch_test: clarify the use of os.RemoveAll(). Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>	5 years ago
Avery Pennarun	4f128745d8	magicsock/test: oops, fix a data race in nested-test logf hack. Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>	5 years ago
Avery Pennarun	08acb502e5	Add tstest.PanicOnLog(), and fix various problems detected by this. If a test calls log.Printf, 'go test' horrifyingly rearranges the output to no longer be in chronological order, which makes debugging virtually impossible. Let's stop that from happening by making log.Printf panic if called from any module, no matter how deep, during tests. This required us to change the default error handler in at least one http.Server, as well as plumbing a bunch of logf functions around, especially in magicsock and wgengine, but also in logtail and backoff. To add insult to injury, 'go test' also rearranges the output when a parent test has multiple sub-tests (all the sub-test's t.Logf is always printed after all the parent tests t.Logf), so we need to screw around with a special Logf that can point at the "current" t (current_t.Logf) in some places. Probably our entire way of using subtests is wrong, since 'go test' would probably like to run them all in parallel if you called t.Parallel(), but it definitely can't because the're all manipulating the shared state created by the parent test. They should probably all be separate toplevel tests instead, with common setup/teardown logic. But that's a job for another time. Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>	5 years ago
Avery Pennarun	64db026c8b	backoff: add a LogLongerThan configuration. Some programs use frequent short-duration backoffs even under non-error conditions. They can set this to avoid logging short backoffs when things are operating normally, but still get messages when longer backoffs kick in. Signed-off-by: Avery Pennarun <apenwarr@tailscale.com>	5 years ago
David Crawshaw	2372530964	logtail/backoff: only log backoffs > 2sec Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
Brad Fitzpatrick	5d67365cc9	logtail: add PrivateID.IsZero method	5 years ago
Brad Fitzpatrick	c726c1eec9	logtail: add const DefaultHost with default server name	5 years ago
Brad Fitzpatrick	3464114b88	logtail: add ParsePublicID that doesn't allocate	5 years ago
Brad Fitzpatrick	996bf9cae7	logtail: don't send a User-Agent Just useless bytes on the wire. Especially with HTTP/1. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	bdc55d7091	logtail: add ParsePrivateID	5 years ago
Brad Fitzpatrick	e71a7c7a2c	logtail: read to EOF on chunked response We'll be fixing the server so this won't trigger in practice, but it demos the connection reuse problem. Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
Brad Fitzpatrick	fcb6a34f4b	logtail: reduce allocations encoding text Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>	5 years ago
David Crawshaw	6ddbcab71e	logtail: rename the unused CheckLogs to DrainLogs Its semantics has changed slightly, this will let us use it to drive batched logging in special circumstances. Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
David Crawshaw	51a12d1307	filch: a few minor comments Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 years ago
Brad Fitzpatrick	8f9fa6a842	logtail: minor style/simplification changes	5 years ago
David Anderson	de0239375a	logtail/filch: use x/sys/unix instead of syscall. In particular, the Dup2 syscall is not defined in the syscall package on arm64, but is defined in x/sys/unix. Signed-off-by: David Anderson <dave@natulte.net>	5 years ago
David Anderson	8380d8575a	logtail: remove unused code from old sentinel logic. Signed-off-by: David Anderson <dave@natulte.net>	5 years ago
David Anderson	be6bcd59cd	logtail: don't pass in nil contexts. Signed-off-by: David Anderson <dave@natulte.net>	5 years ago
David Anderson	250dfc9016	logtail: remove unused struct fields. Signed-off-by: David Anderson <dave@natulte.net>	5 years ago
David Anderson	80ecb8342f	logtail/filch: use io's seek constants. Signed-off-by: David Anderson <dave@natulte.net>	5 years ago
Earl Lee	a8d8b8719a	Move Linux client & common packages into a public repo.	5 years ago

48 Commits (2ce5fc7b0a16eaa85d1d1e8d8c807c3330984a3b)