Bump go.etcd.io/bbolt from 1.3.5 to 1.3.6

Bumps [go.etcd.io/bbolt](https://github.com/etcd-io/bbolt) from 1.3.5 to 1.3.6.
- [Release notes](https://github.com/etcd-io/bbolt/releases)
- [Commits](https://github.com/etcd-io/bbolt/compare/v1.3.5...v1.3.6)

---
updated-dependencies:
- dependency-name: go.etcd.io/bbolt
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

13 files changed, 242 insertions, 29 deletions

diff --git a/vendor/go.etcd.io/bbolt/.gitignore b/vendor/go.etcd.io/bbolt/.gitignore
index 3bcd8cbaf..18312f004 100644
--- a/vendor/go.etcd.io/bbolt/.gitignore
+++ b/vendor/go.etcd.io/bbolt/.gitignore
@@ -3,3 +3,5 @@
 *.swp
 /bin/
 cover.out
+/.idea
+*.iml
diff --git a/vendor/go.etcd.io/bbolt/.travis.yml b/vendor/go.etcd.io/bbolt/.travis.yml
index 257dfdfee..452601e49 100644
--- a/vendor/go.etcd.io/bbolt/.travis.yml
+++ b/vendor/go.etcd.io/bbolt/.travis.yml
@@ -4,9 +4,10 @@ go_import_path: go.etcd.io/bbolt
 sudo: false
 
 go:
-- 1.12
+- 1.15
 
 before_install:
+- go get -v golang.org/x/sys/unix
 - go get -v honnef.co/go/tools/...
 - go get -v github.com/kisielk/errcheck
 
diff --git a/vendor/go.etcd.io/bbolt/Makefile b/vendor/go.etcd.io/bbolt/Makefile
index 2968aaa61..21ecf48f6 100644
--- a/vendor/go.etcd.io/bbolt/Makefile
+++ b/vendor/go.etcd.io/bbolt/Makefile
@@ -2,8 +2,6 @@ BRANCH=`git rev-parse --abbrev-ref HEAD`
 COMMIT=`git rev-parse --short HEAD`
 GOLDFLAGS="-X main.branch $(BRANCH) -X main.commit $(COMMIT)"
 
-default: build
-
 race:
 	@TEST_FREELIST_TYPE=hashmap go test -v -race -test.run="TestSimulate_(100op|1000op)"
 	@echo "array freelist test"
diff --git a/vendor/go.etcd.io/bbolt/README.md b/vendor/go.etcd.io/bbolt/README.md
index c9e64b1a6..f1b4a7b2b 100644
--- a/vendor/go.etcd.io/bbolt/README.md
+++ b/vendor/go.etcd.io/bbolt/README.md
@@ -908,12 +908,14 @@ Below is a list of public, open source projects that use Bolt:
 * [BoltStore](https://github.com/yosssi/boltstore) - Session store using Bolt.
 * [Boltdb Boilerplate](https://github.com/bobintornado/boltdb-boilerplate) - Boilerplate wrapper around bolt aiming to make simple calls one-liners.
 * [BoltDbWeb](https://github.com/evnix/boltdbweb) - A web based GUI for BoltDB files.
+* [BoltDB Viewer](https://github.com/zc310/rich_boltdb) - A BoltDB Viewer Can run on Windows、Linux、Android system.
 * [bleve](http://www.blevesearch.com/) - A pure Go search engine similar to ElasticSearch that uses Bolt as the default storage backend.
 * [btcwallet](https://github.com/btcsuite/btcwallet) - A bitcoin wallet.
 * [buckets](https://github.com/joyrexus/buckets) - a bolt wrapper streamlining
   simple tx and key scans.
 * [cayley](https://github.com/google/cayley) - Cayley is an open-source graph database using Bolt as optional backend.
 * [ChainStore](https://github.com/pressly/chainstore) - Simple key-value interface to a variety of storage engines organized as a chain of operations.
+* [🌰 Chestnut](https://github.com/jrapoport/chestnut) - Chestnut is encrypted storage for Go.
 * [Consul](https://github.com/hashicorp/consul) - Consul is service discovery and configuration made easy. Distributed, highly available, and datacenter-aware.
 * [DVID](https://github.com/janelia-flyem/dvid) - Added Bolt as optional storage engine and testing it against Basho-tuned leveldb.
 * [dcrwallet](https://github.com/decred/dcrwallet) - A wallet for the Decred cryptocurrency.
@@ -938,9 +940,8 @@ Below is a list of public, open source projects that use Bolt:
 * [MetricBase](https://github.com/msiebuhr/MetricBase) - Single-binary version of Graphite.
 * [MuLiFS](https://github.com/dankomiocevic/mulifs) - Music Library Filesystem creates a filesystem to organise your music files.
 * [NATS](https://github.com/nats-io/nats-streaming-server) - NATS Streaming uses bbolt for message and metadata storage.
-* [Operation Go: A Routine Mission](http://gocode.io) - An online programming game for Golang using Bolt for user accounts and a leaderboard.
-* [photosite/session](https://godoc.org/bitbucket.org/kardianos/photosite/session) - Sessions for a photo viewing site.
 * [Prometheus Annotation Server](https://github.com/oliver006/prom_annotation_server) - Annotation server for PromDash & Prometheus service monitoring system.
+* [Rain](https://github.com/cenkalti/rain) - BitTorrent client and library.
 * [reef-pi](https://github.com/reef-pi/reef-pi) - reef-pi is an award winning, modular, DIY reef tank controller using easy to learn electronics based on a Raspberry Pi.
 * [Request Baskets](https://github.com/darklynx/request-baskets) - A web service to collect arbitrary HTTP requests and inspect them via REST API or simple web UI, similar to [RequestBin](http://requestb.in/) service
 * [Seaweed File System](https://github.com/chrislusf/seaweedfs) - Highly scalable distributed key~file system with O(1) disk read.
diff --git a/vendor/go.etcd.io/bbolt/bolt_unix.go b/vendor/go.etcd.io/bbolt/bolt_unix.go
index 2938fed58..4e5f65ccc 100644
--- a/vendor/go.etcd.io/bbolt/bolt_unix.go
+++ b/vendor/go.etcd.io/bbolt/bolt_unix.go
@@ -7,6 +7,8 @@ import (
 	"syscall"
 	"time"
 	"unsafe"
+
+	"golang.org/x/sys/unix"
 )
 
 // flock acquires an advisory lock on a file descriptor.
@@ -49,13 +51,13 @@ func funlock(db *DB) error {
 // mmap memory maps a DB's data file.
 func mmap(db *DB, sz int) error {
 	// Map the data file to memory.
-	b, err := syscall.Mmap(int(db.file.Fd()), 0, sz, syscall.PROT_READ, syscall.MAP_SHARED|db.MmapFlags)
+	b, err := unix.Mmap(int(db.file.Fd()), 0, sz, syscall.PROT_READ, syscall.MAP_SHARED|db.MmapFlags)
 	if err != nil {
 		return err
 	}
 
 	// Advise the kernel that the mmap is accessed randomly.
-	err = madvise(b, syscall.MADV_RANDOM)
+	err = unix.Madvise(b, syscall.MADV_RANDOM)
 	if err != nil && err != syscall.ENOSYS {
 		// Ignore not implemented error in kernel because it still works.
 		return fmt.Errorf("madvise: %s", err)
@@ -76,18 +78,9 @@ func munmap(db *DB) error {
 	}
 
 	// Unmap using the original byte slice.
-	err := syscall.Munmap(db.dataref)
+	err := unix.Munmap(db.dataref)
 	db.dataref = nil
 	db.data = nil
 	db.datasz = 0
 	return err
 }
-
-// NOTE: This function is copied from stdlib because it is not available on darwin.
-func madvise(b []byte, advice int) (err error) {
-	_, _, e1 := syscall.Syscall(syscall.SYS_MADVISE, uintptr(unsafe.Pointer(&b[0])), uintptr(len(b)), uintptr(advice))
-	if e1 != 0 {
-		err = e1
-	}
-	return
-}
diff --git a/vendor/go.etcd.io/bbolt/compact.go b/vendor/go.etcd.io/bbolt/compact.go
new file mode 100644
index 000000000..e4fe91b04
--- /dev/null
+++ b/vendor/go.etcd.io/bbolt/compact.go
@@ -0,0 +1,114 @@
+package bbolt
+
+// Compact will create a copy of the source DB and in the destination DB. This may
+// reclaim space that the source database no longer has use for. txMaxSize can be
+// used to limit the transactions size of this process and may trigger intermittent
+// commits. A value of zero will ignore transaction sizes.
+// TODO: merge with: https://github.com/etcd-io/etcd/blob/b7f0f52a16dbf83f18ca1d803f7892d750366a94/mvcc/backend/backend.go#L349
+func Compact(dst, src *DB, txMaxSize int64) error {
+	// commit regularly, or we'll run out of memory for large datasets if using one transaction.
+	var size int64
+	tx, err := dst.Begin(true)
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+
+	if err := walk(src, func(keys [][]byte, k, v []byte, seq uint64) error {
+		// On each key/value, check if we have exceeded tx size.
+		sz := int64(len(k) + len(v))
+		if size+sz > txMaxSize && txMaxSize != 0 {
+			// Commit previous transaction.
+			if err := tx.Commit(); err != nil {
+				return err
+			}
+
+			// Start new transaction.
+			tx, err = dst.Begin(true)
+			if err != nil {
+				return err
+			}
+			size = 0
+		}
+		size += sz
+
+		// Create bucket on the root transaction if this is the first level.
+		nk := len(keys)
+		if nk == 0 {
+			bkt, err := tx.CreateBucket(k)
+			if err != nil {
+				return err
+			}
+			if err := bkt.SetSequence(seq); err != nil {
+				return err
+			}
+			return nil
+		}
+
+		// Create buckets on subsequent levels, if necessary.
+		b := tx.Bucket(keys[0])
+		if nk > 1 {
+			for _, k := range keys[1:] {
+				b = b.Bucket(k)
+			}
+		}
+
+		// Fill the entire page for best compaction.
+		b.FillPercent = 1.0
+
+		// If there is no value then this is a bucket call.
+		if v == nil {
+			bkt, err := b.CreateBucket(k)
+			if err != nil {
+				return err
+			}
+			if err := bkt.SetSequence(seq); err != nil {
+				return err
+			}
+			return nil
+		}
+
+		// Otherwise treat it as a key/value pair.
+		return b.Put(k, v)
+	}); err != nil {
+		return err
+	}
+
+	return tx.Commit()
+}
+
+// walkFunc is the type of the function called for keys (buckets and "normal"
+// values) discovered by Walk. keys is the list of keys to descend to the bucket
+// owning the discovered key/value pair k/v.
+type walkFunc func(keys [][]byte, k, v []byte, seq uint64) error
+
+// walk walks recursively the bolt database db, calling walkFn for each key it finds.
+func walk(db *DB, walkFn walkFunc) error {
+	return db.View(func(tx *Tx) error {
+		return tx.ForEach(func(name []byte, b *Bucket) error {
+			return walkBucket(b, nil, name, nil, b.Sequence(), walkFn)
+		})
+	})
+}
+
+func walkBucket(b *Bucket, keypath [][]byte, k, v []byte, seq uint64, fn walkFunc) error {
+	// Execute callback.
+	if err := fn(keypath, k, v, seq); err != nil {
+		return err
+	}
+
+	// If this is not a bucket then stop.
+	if v != nil {
+		return nil
+	}
+
+	// Iterate over each child key/value.
+	keypath = append(keypath, k)
+	return b.ForEach(func(k, v []byte) error {
+		if v == nil {
+			bkt := b.Bucket(k)
+			return walkBucket(bkt, keypath, k, nil, bkt.Sequence(), fn)
+		}
+		return walkBucket(b, keypath, k, v, b.Sequence(), fn)
+	})
+}
diff --git a/vendor/go.etcd.io/bbolt/db.go b/vendor/go.etcd.io/bbolt/db.go
index 80b0095cc..a798c390a 100644
--- a/vendor/go.etcd.io/bbolt/db.go
+++ b/vendor/go.etcd.io/bbolt/db.go
@@ -120,6 +120,12 @@ type DB struct {
 	// of truncate() and fsync() when growing the data file.
 	AllocSize int
 
+	// Mlock locks database file in memory when set to true.
+	// It prevents major page faults, however used memory can't be reclaimed.
+	//
+	// Supported only on Unix via mlock/munlock syscalls.
+	Mlock bool
+
 	path     string
 	openFile func(string, int, os.FileMode) (*os.File, error)
 	file     *os.File
@@ -188,6 +194,7 @@ func Open(path string, mode os.FileMode, options *Options) (*DB, error) {
 	db.MmapFlags = options.MmapFlags
 	db.NoFreelistSync = options.NoFreelistSync
 	db.FreelistType = options.FreelistType
+	db.Mlock = options.Mlock
 
 	// Set default values for later DB operations.
 	db.MaxBatchSize = DefaultMaxBatchSize
@@ -337,7 +344,8 @@ func (db *DB) mmap(minsz int) error {
 	}
 
 	// Ensure the size is at least the minimum size.
-	var size = int(info.Size())
+	fileSize := int(info.Size())
+	var size = fileSize
 	if size < minsz {
 		size = minsz
 	}
@@ -346,6 +354,13 @@ func (db *DB) mmap(minsz int) error {
 		return err
 	}
 
+	if db.Mlock {
+		// Unlock db memory
+		if err := db.munlock(fileSize); err != nil {
+			return err
+		}
+	}
+
 	// Dereference all mmap references before unmapping.
 	if db.rwtx != nil {
 		db.rwtx.root.dereference()
@@ -361,6 +376,13 @@ func (db *DB) mmap(minsz int) error {
 		return err
 	}
 
+	if db.Mlock {
+		// Don't allow swapping of data file
+		if err := db.mlock(fileSize); err != nil {
+			return err
+		}
+	}
+
 	// Save references to the meta pages.
 	db.meta0 = db.page(0).meta()
 	db.meta1 = db.page(1).meta()
@@ -422,12 +444,36 @@ func (db *DB) mmapSize(size int) (int, error) {
 	return int(sz), nil
 }
 
+func (db *DB) munlock(fileSize int) error {
+	if err := munlock(db, fileSize); err != nil {
+		return fmt.Errorf("munlock error: " + err.Error())
+	}
+	return nil
+}
+
+func (db *DB) mlock(fileSize int) error {
+	if err := mlock(db, fileSize); err != nil {
+		return fmt.Errorf("mlock error: " + err.Error())
+	}
+	return nil
+}
+
+func (db *DB) mrelock(fileSizeFrom, fileSizeTo int) error {
+	if err := db.munlock(fileSizeFrom); err != nil {
+		return err
+	}
+	if err := db.mlock(fileSizeTo); err != nil {
+		return err
+	}
+	return nil
+}
+
 // init creates a new database file and initializes its meta pages.
 func (db *DB) init() error {
 	// Create two meta pages on a buffer.
 	buf := make([]byte, db.pageSize*4)
 	for i := 0; i < 2; i++ {
-		p := db.pageInBuffer(buf[:], pgid(i))
+		p := db.pageInBuffer(buf, pgid(i))
 		p.id = pgid(i)
 		p.flags = metaPageFlag
 
@@ -444,13 +490,13 @@ func (db *DB) init() error {
 	}
 
 	// Write an empty freelist at page 3.
-	p := db.pageInBuffer(buf[:], pgid(2))
+	p := db.pageInBuffer(buf, pgid(2))
 	p.id = pgid(2)
 	p.flags = freelistPageFlag
 	p.count = 0
 
 	// Write an empty leaf page at page 4.
-	p = db.pageInBuffer(buf[:], pgid(3))
+	p = db.pageInBuffer(buf, pgid(3))
 	p.id = pgid(3)
 	p.flags = leafPageFlag
 	p.count = 0
@@ -462,6 +508,7 @@ func (db *DB) init() error {
 	if err := fdatasync(db); err != nil {
 		return err
 	}
+	db.filesz = len(buf)
 
 	return nil
 }
@@ -973,6 +1020,12 @@ func (db *DB) grow(sz int) error {
 		if err := db.file.Sync(); err != nil {
 			return fmt.Errorf("file sync error: %s", err)
 		}
+		if db.Mlock {
+			// unlock old file and lock new one
+			if err := db.mrelock(db.filesz, sz); err != nil {
+				return fmt.Errorf("mlock/munlock error: %s", err)
+			}
+		}
 	}
 
 	db.filesz = sz
@@ -1064,6 +1117,11 @@ type Options struct {
 	// OpenFile is used to open files. It defaults to os.OpenFile. This option
 	// is useful for writing hermetic tests.
 	OpenFile func(string, int, os.FileMode) (*os.File, error)
+
+	// Mlock locks database file in memory when set to true.
+	// It prevents potential page faults, however
+	// used memory can't be reclaimed. (UNIX only)
+	Mlock bool
 }
 
 // DefaultOptions represent the options used if nil options are passed into Open().
diff --git a/vendor/go.etcd.io/bbolt/freelist_hmap.go b/vendor/go.etcd.io/bbolt/freelist_hmap.go
index 02ef2be04..dbd67a1e7 100644
--- a/vendor/go.etcd.io/bbolt/freelist_hmap.go
+++ b/vendor/go.etcd.io/bbolt/freelist_hmap.go
@@ -4,7 +4,7 @@ import "sort"
 
 // hashmapFreeCount returns count of free pages(hashmap version)
 func (f *freelist) hashmapFreeCount() int {
-	// use the forwardmap to get the total count
+	// use the forwardMap to get the total count
 	count := 0
 	for _, size := range f.forwardMap {
 		count += int(size)
@@ -41,7 +41,7 @@ func (f *freelist) hashmapAllocate(txid txid, n int) pgid {
 
 		for pid := range bm {
 			// remove the initial
-			f.delSpan(pid, uint64(size))
+			f.delSpan(pid, size)
 
 			f.allocs[pid] = txid
 
@@ -51,7 +51,7 @@ func (f *freelist) hashmapAllocate(txid txid, n int) pgid {
 			f.addSpan(pid+pgid(n), remain)
 
 			for i := pgid(0); i < pgid(n); i++ {
-				delete(f.cache, pid+pgid(i))
+				delete(f.cache, pid+i)
 			}
 			return pid
 		}
diff --git a/vendor/go.etcd.io/bbolt/go.mod b/vendor/go.etcd.io/bbolt/go.mod
index c2366daef..96355a69b 100644
--- a/vendor/go.etcd.io/bbolt/go.mod
+++ b/vendor/go.etcd.io/bbolt/go.mod
@@ -2,4 +2,4 @@ module go.etcd.io/bbolt
 
 go 1.12
 
-require golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5
+require golang.org/x/sys v0.0.0-20200923182605-d9f96fdee20d
diff --git a/vendor/go.etcd.io/bbolt/go.sum b/vendor/go.etcd.io/bbolt/go.sum
index 4ad15a488..c13f8f470 100644
--- a/vendor/go.etcd.io/bbolt/go.sum
+++ b/vendor/go.etcd.io/bbolt/go.sum
@@ -1,2 +1,2 @@
-golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5 h1:LfCXLvNmTYH9kEmVgqbnsWfruoXZIrh4YBgqVHtDvw0=
-golang.org/x/sys v0.0.0-20200202164722-d101bd2416d5/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200923182605-d9f96fdee20d h1:L/IKR6COd7ubZrs2oTnTi73IhgqJ71c9s80WsQnh0Es=
+golang.org/x/sys v0.0.0-20200923182605-d9f96fdee20d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
diff --git a/vendor/go.etcd.io/bbolt/mlock_unix.go b/vendor/go.etcd.io/bbolt/mlock_unix.go
new file mode 100644
index 000000000..6a6c7b353
--- /dev/null
+++ b/vendor/go.etcd.io/bbolt/mlock_unix.go
@@ -0,0 +1,36 @@
+// +build !windows
+
+package bbolt
+
+import "golang.org/x/sys/unix"
+
+// mlock locks memory of db file
+func mlock(db *DB, fileSize int) error {
+	sizeToLock := fileSize
+	if sizeToLock > db.datasz {
+		// Can't lock more than mmaped slice
+		sizeToLock = db.datasz
+	}
+	if err := unix.Mlock(db.dataref[:sizeToLock]); err != nil {
+		return err
+	}
+	return nil
+}
+
+//munlock unlocks memory of db file
+func munlock(db *DB, fileSize int) error {
+	if db.dataref == nil {
+		return nil
+	}
+
+	sizeToUnlock := fileSize
+	if sizeToUnlock > db.datasz {
+		// Can't unlock more than mmaped slice
+		sizeToUnlock = db.datasz
+	}
+
+	if err := unix.Munlock(db.dataref[:sizeToUnlock]); err != nil {
+		return err
+	}
+	return nil
+}
diff --git a/vendor/go.etcd.io/bbolt/mlock_windows.go b/vendor/go.etcd.io/bbolt/mlock_windows.go
new file mode 100644
index 000000000..b4a36a493
--- /dev/null
+++ b/vendor/go.etcd.io/bbolt/mlock_windows.go
@@ -0,0 +1,11 @@
+package bbolt
+
+// mlock locks memory of db file
+func mlock(_ *DB, _ int) error {
+	panic("mlock is supported only on UNIX systems")
+}
+
+//munlock unlocks memory of db file
+func munlock(_ *DB, _ int) error {
+	panic("munlock is supported only on UNIX systems")
+}
diff --git a/vendor/go.etcd.io/bbolt/tx.go b/vendor/go.etcd.io/bbolt/tx.go
index 4b1a64a8b..869d41200 100644
--- a/vendor/go.etcd.io/bbolt/tx.go
+++ b/vendor/go.etcd.io/bbolt/tx.go
@@ -188,7 +188,6 @@ func (tx *Tx) Commit() error {
 	}
 
 	// If strict mode is enabled then perform a consistency check.
-	// Only the first consistency error is reported in the panic.
 	if tx.db.StrictMode {
 		ch := tx.Check()
 		var errs []string
@@ -393,7 +392,7 @@ func (tx *Tx) CopyFile(path string, mode os.FileMode) error {
 		return err
 	}
 
-	err = tx.Copy(f)
+	_, err = tx.WriteTo(f)
 	if err != nil {
 		_ = f.Close()
 		return err