Close memory holes, adjust tests

types.go

@@ -3,6 +3,7 @@ package main
 import (
 	"net"
 	"sync"
+	"time"
 
 	"github.com/racingmars/go3270"
 )
@@ -108,12 +109,14 @@ type TargetSystem struct {
 }
 
 type ServerConfig struct {
-	BindAddress string `toml:"bind_address"`
-	Codepage    string `toml:"codepage"`
-	TLS         bool   `toml:"tls"`
-	CertFile    string `toml:"cert_file"`
-	KeyFile     string `toml:"key_file"`
-	Public      bool   `toml:"public"`
+	BindAddress          string `toml:"bind_address"`
+	Codepage             string `toml:"codepage"`
+	TLS                  bool   `toml:"tls"`
+	CertFile             string `toml:"cert_file"`
+	KeyFile              string `toml:"key_file"`
+	Public               bool   `toml:"public"`
+	AutoHoldDiscardLimit int    `toml:"auto_hold_discard_limit"`
+	AutoHoldBurstLimit   int    `toml:"auto_hold_burst_limit"`
 }
 
 type LoginConfig struct {
@@ -146,17 +149,39 @@ type Config struct {
 	Users   []UserConfig   `toml:"users"`
 }
 
+const (
+	defaultAutoHoldDiscardLimit = 5
+	autoHoldDiscardWindow       = 5 * time.Second
+	defaultAutoHoldBurstLimit   = 20
+	autoHoldBurstWindow         = 1 * time.Second
+)
+
 type SessionSlot struct {
-	System        TargetSystem
-	Upstream      net.Conn
-	LastScreen    []byte
-	ScreenChanged bool
-	IsTN3270E     bool
-	IsBound       bool
-	SeqNumber     uint16
-	IsHeld        bool
-	MaxBufferSize int
-	Mu            sync.Mutex
+	System               TargetSystem
+	Upstream             net.Conn
+	LastScreen           []byte
+	ScreenChanged        bool
+	IsTN3270E            bool
+	IsBound              bool
+	SeqNumber            uint16
+	IsHeld               bool
+	MaxBufferSize        int
+	DiscardCount         int
+	DiscardWindow        time.Time
+	WriteBurstCount      int
+	WriteBurstWindow     time.Time
+	AutoHoldDiscardLimit int
+	AutoHoldBurstLimit   int
+	Mu                   sync.Mutex
+}
+
+func (s *SessionSlot) resetHoldAndLoopCountersLocked() {
+	s.IsHeld = false
+	s.ScreenChanged = false
+	s.DiscardCount = 0
+	s.DiscardWindow = time.Time{}
+	s.WriteBurstCount = 0
+	s.WriteBurstWindow = time.Time{}
 }
 
 type slotRenderInfo struct {