syncthing/lib/db/debug.go

// Copyright (C) 2014 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.

package db

import (
	"os"
	"strings"

	"github.com/syncthing/syncthing/lib/logger"
)

var (
	l = logger.DefaultLogger.NewFacility("db", "The database layer")
)

func init() {
	l.SetDebug("db", strings.Contains(os.Getenv("STTRACE"), "db") || os.Getenv("STTRACE") == "all")
}

func shouldDebug() bool {
	return l.ShouldDebug("db")
}
Use more inclusive copyright header 2014-11-16 13:13:20 -07:00			`// Copyright (C) 2014 The Syncthing Authors.`
Relicense to GPL 2014-09-29 12:43:32 -07:00			`//`
MPLv2 2015-03-07 13:36:35 -07:00			`// This Source Code Form is subject to the terms of the Mozilla Public`
			`// License, v. 2.0. If a copy of the MPL was not distributed with this file,`
all: Update license url to https (ref #3976) 2017-02-08 23:52:18 -07:00			`// You can obtain one at https://mozilla.org/MPL/2.0/.`
Add license header 2014-06-01 13:50:14 -07:00
Rename package internal/files to internal/db 2015-01-12 06:50:30 -07:00			`package db`
The Great Rewrite (fixes #36, #61, #94, #101) Rewrite of the file model and pulling mechanism. Needs lots of cleanup and bugfixes, now... 2014-03-28 06:36:57 -07:00
			`import (`
			`"os"`
			`"strings"`
Refactor logging into separate package 2014-05-14 17:08:56 -07:00
Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system. 2015-10-03 08:25:21 -07:00			`"github.com/syncthing/syncthing/lib/logger"`
The Great Rewrite (fixes #36, #61, #94, #101) Rewrite of the file model and pulling mechanism. Needs lots of cleanup and bugfixes, now... 2014-03-28 06:36:57 -07:00			`)`

			`var (`
Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system. 2015-10-03 08:25:21 -07:00			`l = logger.DefaultLogger.NewFacility("db", "The database layer")`
The Great Rewrite (fixes #36, #61, #94, #101) Rewrite of the file model and pulling mechanism. Needs lots of cleanup and bugfixes, now... 2014-03-28 06:36:57 -07:00			`)`
Implement facility based logger, debugging via REST API This implements a new debug/trace infrastructure based on a slightly hacked up logger. Instead of the traditional "if debug { ... }" I've rewritten the logger to have no-op Debugln and Debugf, unless debugging has been enabled for a given "facility". The "facility" is just a string, typically a package name. This will be slightly slower than before; but not that much as it's mostly a function call that returns immediately. For the cases where it matters (the Debugln takes a hex.Dump() of something for example, and it's not in a very occasional "if err != nil" branch) there is an l.ShouldDebug(facility) that is fast enough to be used like the old "if debug". The point of all this is that we can now toggle debugging for the various packages on and off at runtime. There's a new method /rest/system/debug that can be POSTed a set of facilities to enable and disable debug for, or GET from to get a list of facilities with descriptions and their current debug status. Similarly a /rest/system/log?since=... can grab the latest log entries, up to 250 of them (hardcoded constant in main.go) plus the initial few. Not implemented in this commit (but planned) is a simple debug GUI available on /debug that shows the current log in an easily pasteable format and has checkboxes to enable the various debug facilities. The debug instructions to a user then becomes "visit this URL, check these boxes, reproduce your problem, copy and paste the log". The actual log viewer on the hypothetical /debug URL can poll regularly for new log entries and this bypass the 250 line limit. The existing STTRACE=foo variable is still obeyed and just sets the start state of the system. 2015-10-03 08:25:21 -07:00
			`func init() {`
			`l.SetDebug("db", strings.Contains(os.Getenv("STTRACE"), "db") \|\| os.Getenv("STTRACE") == "all")`
			`}`
lib/db: Fix inconsistency in sequence index (fixes #5149) (#5158) The problem here is that we would update the sequence index before updating the FileInfos, which would result in a high sequence number pointing to a low-sequence FileInfo. The index sender would pick up the high sequence number, send the old file, and think everything was good. On the receiving side the old file is a no-op and ignored. The file remains out of sync until another update for it happens. This fixes that by correcting the order of operations in the database update: first we remove old sequence index entries, then we update the FileInfos (which now don't have anything pointing to them) and then we add the sequence indexes (which the index sender can see). The other option is to add "proper" transactions where required at the database layer. I actually have a branch for that, but it's literally thousands of lines of diff and I'm putting that off for another day as this solves the problem... 2018-09-02 11:58:32 -07:00
			`func shouldDebug() bool {`
			`return l.ShouldDebug("db")`
			`}`