formalize class selection to facilitate highest cascade when running limit actions (#606)

controller/limits/agent.go

@@ -64,7 +64,7 @@ func (a *Agent) CanCreateEnvironment(acctId int, trx *sqlx.Tx) (bool, error) {
 		maxEnvironments := a.cfg.Environments
 		var lcId *int
 		for _, alc := range alcs {
-			if alc.ShareMode == "" && alc.BackendMode == "" && alc.Environments > maxEnvironments {
+			if alc.ShareMode == nil && alc.BackendMode == nil && alc.Environments > maxEnvironments {
 				maxEnvironments = alc.Environments
 				lcId = &alc.Id
 			}
@@ -570,9 +570,6 @@ func (a *Agent) bandwidthClassPoints(bwc store.BandwidthClass) int {
 	if bwc.GetLimitAction() == store.LimitLimitAction {
 		points += 2
 	}
-	if bwc.GetShareMode() != "" {
-		points += 5
-	}
 	if bwc.GetBackendMode() != "" {
 		points += 10
 	}

controller/limits/model.go

@@ -3,8 +3,15 @@ package limits
 import (
 	"github.com/jmoiron/sqlx"
 	"github.com/openziti/zrok/controller/store"
+	"github.com/openziti/zrok/sdk/golang/sdk"
 )
 
+type UserLimits struct {
+	resource  store.ResourceCountClass
+	bandwidth store.BandwidthClass
+	scopes    map[sdk.BackendMode]store.BandwidthClass
+}
+
 type AccountAction interface {
 	HandleAccount(a *store.Account, rxBytes, txBytes int64, limit store.BandwidthClass, trx *sqlx.Tx) error
 }

controller/store/limitClass.go

@@ -7,10 +7,19 @@ import (
 	"github.com/pkg/errors"
 )
 
+type ResourceCountClass interface {
+	IsGlobal() bool
+	GetLimitClassId() int
+	GetEnvironments() int
+	GetShares() int
+	GetReservedShares() int
+	GetUniqueNames() int
+	String()
+}
+
 type BandwidthClass interface {
 	IsGlobal() bool
 	GetLimitClassId() int
-	GetShareMode() sdk.ShareMode
 	GetBackendMode() sdk.BackendMode
 	GetPeriodMinutes() int
 	GetRxBytes() int64
@@ -22,8 +31,8 @@ type BandwidthClass interface {
 
 type LimitClass struct {
 	Model
-	ShareMode      sdk.ShareMode
-	BackendMode    sdk.BackendMode
+	ShareMode      *sdk.ShareMode
+	BackendMode    *sdk.BackendMode
 	Environments   int
 	Shares         int
 	ReservedShares int
@@ -44,11 +53,17 @@ func (lc LimitClass) GetLimitClassId() int {
 }
 
 func (lc LimitClass) GetShareMode() sdk.ShareMode {
-	return lc.ShareMode
+	if lc.ShareMode == nil {
+		return ""
+	}
+	return *lc.ShareMode
 }
 
 func (lc LimitClass) GetBackendMode() sdk.BackendMode {
-	return lc.BackendMode
+	if lc.BackendMode == nil {
+		return ""
+	}
+	return *lc.BackendMode
 }
 
 func (lc LimitClass) GetPeriodMinutes() int {