Drop support for go 1.20

[btrtrc.git] / misc.go

diff --git a/misc.go b/misc.go
index 9c618d9ac1c391fd49344ba00798da05596c3750..7d3007ecee74eb92f58eee434dfb9431a86f9098 100644 (file)
--- a/misc.go
+++ b/misc.go
@@ -2,37 +2,38 @@ package torrent
 
 import (
        "errors"
-       "log"
        "net"
 
-       "github.com/anacrolix/missinggo"
+       "github.com/RoaringBitmap/roaring"
+       "github.com/anacrolix/missinggo/v2"
+       "golang.org/x/time/rate"
+
        "github.com/anacrolix/torrent/metainfo"
        pp "github.com/anacrolix/torrent/peer_protocol"
+       "github.com/anacrolix/torrent/types"
+       "github.com/anacrolix/torrent/types/infohash"
 )
 
-type chunkSpec struct {
-       Begin, Length pp.Integer
-}
-
-type request struct {
-       Index pp.Integer
-       chunkSpec
-}
+type (
+       Request       = types.Request
+       ChunkSpec     = types.ChunkSpec
+       piecePriority = types.PiecePriority
+)
 
-func (r request) ToMsg(mt pp.MessageType) pp.Message {
-       return pp.Message{
-               Type:   mt,
-               Index:  r.Index,
-               Begin:  r.Begin,
-               Length: r.Length,
-       }
-}
+const (
+       PiecePriorityNormal    = types.PiecePriorityNormal
+       PiecePriorityNone      = types.PiecePriorityNone
+       PiecePriorityNow       = types.PiecePriorityNow
+       PiecePriorityReadahead = types.PiecePriorityReadahead
+       PiecePriorityNext      = types.PiecePriorityNext
+       PiecePriorityHigh      = types.PiecePriorityHigh
+)
 
-func newRequest(index, begin, length pp.Integer) request {
-       return request{index, chunkSpec{begin, length}}
+func newRequest(index, begin, length pp.Integer) Request {
+       return Request{index, ChunkSpec{begin, length}}
 }
 
-func newRequestFromMessage(msg *pp.Message) request {
+func newRequestFromMessage(msg *pp.Message) Request {
        switch msg.Type {
        case pp.Request, pp.Cancel, pp.Reject:
                return newRequest(msg.Index, msg.Begin, msg.Length)
@@ -44,7 +45,7 @@ func newRequestFromMessage(msg *pp.Message) request {
 }
 
 // The size in bytes of a metadata extension piece.
-func metadataPieceSize(totalSize int, piece int) int {
+func metadataPieceSize(totalSize, piece int) int {
        ret := totalSize - piece*(1<<14)
        if ret > 1<<14 {
                ret = 1 << 14
@@ -53,8 +54,11 @@ func metadataPieceSize(totalSize int, piece int) int {
 }
 
 // Return the request that would include the given offset into the torrent data.
-func torrentOffsetRequest(torrentLength, pieceSize, chunkSize, offset int64) (
-       r request, ok bool) {
+func torrentOffsetRequest(
+       torrentLength, pieceSize, chunkSize, offset int64,
+) (
+       r Request, ok bool,
+) {
        if offset < 0 || offset >= torrentLength {
                return
        }
@@ -73,10 +77,10 @@ func torrentOffsetRequest(torrentLength, pieceSize, chunkSize, offset int64) (
        return
 }
 
-func torrentRequestOffset(torrentLength, pieceSize int64, r request) (off int64) {
+func torrentRequestOffset(torrentLength, pieceSize int64, r Request) (off int64) {
        off = int64(r.Index)*pieceSize + int64(r.Begin)
        if off < 0 || off >= torrentLength {
-               panic("invalid request")
+               panic("invalid Request")
        }
        return
 }
@@ -97,38 +101,94 @@ func validateInfo(info *metainfo.Info) error {
        return nil
 }
 
-func chunkIndexSpec(index int, pieceLength, chunkSize pp.Integer) chunkSpec {
-       ret := chunkSpec{pp.Integer(index) * chunkSize, chunkSize}
+func chunkIndexSpec(index, pieceLength, chunkSize pp.Integer) ChunkSpec {
+       ret := ChunkSpec{pp.Integer(index) * chunkSize, chunkSize}
        if ret.Begin+ret.Length > pieceLength {
                ret.Length = pieceLength - ret.Begin
        }
        return ret
 }
 
-func connLessTrusted(l, r *connection) bool {
-       return l.netGoodPiecesDirtied() < r.netGoodPiecesDirtied()
+func connLessTrusted(l, r *Peer) bool {
+       return l.trust().Less(r.trust())
+}
+
+func connIsIpv6(nc interface {
+       LocalAddr() net.Addr
+},
+) bool {
+       ra := nc.LocalAddr()
+       rip := addrIpOrNil(ra)
+       return rip.To4() == nil && rip.To16() != nil
+}
+
+func clamp(min, value, max int64) int64 {
+       if min > max {
+               panic("harumph")
+       }
+       if value < min {
+               value = min
+       }
+       if value > max {
+               value = max
+       }
+       return value
 }
 
-// Convert a net.Addr to its compact IP representation. Either 4 or 16 bytes
-// per "yourip" field of http://www.bittorrent.org/beps/bep_0010.html.
-func addrCompactIP(addr net.Addr) (string, error) {
-       host, _, err := net.SplitHostPort(addr.String())
-       if err != nil {
-               return "", err
-       }
-       ip := net.ParseIP(host)
-       if v4 := ip.To4(); v4 != nil {
-               if len(v4) != 4 {
-                       panic(v4)
+func max(as ...int64) int64 {
+       ret := as[0]
+       for _, a := range as[1:] {
+               if a > ret {
+                       ret = a
                }
-               return string(v4), nil
        }
-       return string(ip.To16()), nil
+       return ret
 }
 
-func connIsIpv6(nc net.Conn) bool {
-       ra := nc.RemoteAddr()
-       log.Printf("network: %q, string: %q", ra.Network(), ra.String())
-       rip := missinggo.AddrIP(ra)
-       return rip.To4() == nil && rip.To16() != nil
+func maxInt(as ...int) int {
+       ret := as[0]
+       for _, a := range as[1:] {
+               if a > ret {
+                       ret = a
+               }
+       }
+       return ret
+}
+
+func min(as ...int64) int64 {
+       ret := as[0]
+       for _, a := range as[1:] {
+               if a < ret {
+                       ret = a
+               }
+       }
+       return ret
+}
+
+func minInt(as ...int) int {
+       ret := as[0]
+       for _, a := range as[1:] {
+               if a < ret {
+                       ret = a
+               }
+       }
+       return ret
+}
+
+var unlimited = rate.NewLimiter(rate.Inf, 0)
+
+type (
+       pieceIndex = int
+       // Deprecated: Use infohash.T directly to avoid unnecessary imports.
+       InfoHash = infohash.T
+       IpPort   = missinggo.IpPort
+)
+
+func boolSliceToBitmap(slice []bool) (rb roaring.Bitmap) {
+       for i, b := range slice {
+               if b {
+                       rb.AddInt(i)
+               }
+       }
+       return
 }