11 Commits (dependabot/github_actions/github/codeql-action-4.31.9)

Author	SHA1	Message	Date
Joe Tsai	9613b4eecc	logtail: add metrics (#18184) ... Add metrics about logtail uploading and underlying buffer. Add metrics to the in-memory buffer implementation. Updates tailscale/corp#21363 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 month ago
Joe Tsai	6428ba01ef	logtail/filch: rewrite the package (#18143) ... The filch implementation is fairly broken: * When Filch.cur exceeds MaxFileSize, it calls moveContents to copy the entirety of cur into alt (while holding the write lock). By nature, this is the movement of a lot of data in a hot path, meaning that all log calls will be globally blocked! It also means that log uploads will be blocked during the move. * The implementation of moveContents is buggy in that it copies data from cur into the start of alt, but fails to truncate alt to the number of bytes copied. Consequently, there are unrelated lines near the end, leading to out-of-order lines when being read back. * Data filched via stderr do not directly respect MaxFileSize, which is only checked every 100 Filch.Write calls. This means that it is possible that the file grows far beyond the specified max file size before moveContents is called. * If both log files have data when New is called, it also copies the entirety of cur into alt. This can block the startup of a process copying lots of data before the process can do any useful work. * TryReadLine is implemented using bufio.Scanner. Unfortunately, it will choke on any lines longer than bufio.MaxScanTokenSize, rather than gracefully skip over them. The re-implementation avoids a lot of these problems by fundamentally eliminating the need for moveContent. We enforce MaxFileSize by simply rotating the log files whenever the current file exceeds MaxFileSize/2. This is a constant-time operation regardless of file size. To more gracefully handle lines longer than bufio.MaxScanTokenSize, we skip over these lines (without growing the read buffer) and report an error. This allows subsequent lines to be read. In order to improve debugging, we add a lot of metrics. Note that the the mechanism of dup2 with stderr is inherently racy with a the two file approach. The order of operations during a rotation is carefully chosen to reduce the race window to be as short as possible. Thus, this is slightly less racy than before. Updates tailscale/corp#21363 Signed-off-by: Joe Tsai <joetsai@digital-static.net>	1 month 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>	3 years ago
Maisem Ali	05e55f4a0b	logtail/filch: limit buffer file size to 50MB ... Signed-off-by: Maisem Ali <maisem@tailscale.com>	4 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>	4 years ago
David Crawshaw	297b3d6fa4	staticcheck.conf: turn off noisy lint errors ... Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	5 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>	5 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>	5 years ago
David Crawshaw	51a12d1307	filch: a few minor comments ... Signed-off-by: David Crawshaw <crawshaw@tailscale.com>	6 years ago
David Anderson	80ecb8342f	logtail/filch: use io's seek constants. ... Signed-off-by: David Anderson <dave@natulte.net>	6 years ago
Earl Lee	a8d8b8719a	Move Linux client & common packages into a public repo.	6 years ago