propagate errors from datastore ops

p2p/net/conngater/conngater.go

@@ -40,7 +40,7 @@ const (
 // NewBasicConnectionGater creates a new connection gater.
 // The ds argument is an (optional, can be nil) datastore to persist the connection gater
 // filters
-func NewBasicConnectionGater(ds datastore.Datastore) *BasicConnectionGater {
+func NewBasicConnectionGater(ds datastore.Datastore) (*BasicConnectionGater, error) {
 	cg := &BasicConnectionGater{
 		blockedPeers:   make(map[peer.ID]struct{}),
 		blockedAddrs:   make(map[string]struct{}),
@@ -49,24 +49,27 @@ func NewBasicConnectionGater(ds datastore.Datastore) *BasicConnectionGater {
 
 	if ds != nil {
 		cg.ds = namespace.Wrap(ds, datastore.NewKey(ns))
-		cg.loadRules()
+		err := cg.loadRules()
+		if err != nil {
+			return nil, err
+		}
 	}
 
-	return cg
+	return cg, nil
 }
 
-func (cg *BasicConnectionGater) loadRules() {
+func (cg *BasicConnectionGater) loadRules() error {
 	// load blocked peers
 	res, err := cg.ds.Query(query.Query{Prefix: keyPeer})
 	if err != nil {
 		log.Errorf("error querying datastore for blocked peers: %s", err)
-		return
+		return err
 	}
 
 	for r := range res.Next() {
 		if r.Error != nil {
 			log.Errorf("query result error: %s", r.Error)
-			return
+			return err
 		}
 
 		p := peer.ID(r.Entry.Value)
@@ -77,13 +80,13 @@ func (cg *BasicConnectionGater) loadRules() {
 	res, err = cg.ds.Query(query.Query{Prefix: keyAddr})
 	if err != nil {
 		log.Errorf("error querying datastore for blocked addrs: %s", err)
-		return
+		return err
 	}
 
 	for r := range res.Next() {
 		if r.Error != nil {
 			log.Errorf("query result error: %s", r.Error)
-			return
+			return err
 		}
 
 		ip := net.IP(r.Entry.Value)
@@ -94,53 +97,60 @@ func (cg *BasicConnectionGater) loadRules() {
 	res, err = cg.ds.Query(query.Query{Prefix: keySubnet})
 	if err != nil {
 		log.Errorf("error querying datastore for blocked subnets: %s", err)
-		return
+		return err
 	}
 
 	for r := range res.Next() {
 		if r.Error != nil {
 			log.Errorf("query result error: %s", r.Error)
-			return
+			return err
 		}
 
 		ipnetStr := string(r.Entry.Value)
 		_, ipnet, err := net.ParseCIDR(ipnetStr)
 		if err != nil {
 			log.Errorf("error parsing CIDR subnet: %s", err)
-			return
+			return err
 		}
 		cg.blockedSubnets[ipnetStr] = ipnet
 	}
+
+	return nil
 }
 
 // BlockPeer adds a peer to the set of blocked peers
-func (cg *BasicConnectionGater) BlockPeer(p peer.ID) {
-	cg.Lock()
-	defer cg.Unlock()
-
-	cg.blockedPeers[p] = struct{}{}
-
+func (cg *BasicConnectionGater) BlockPeer(p peer.ID) error {
 	if cg.ds != nil {
 		err := cg.ds.Put(datastore.NewKey(keyPeer+p.String()), []byte(p))
 		if err != nil {
 			log.Errorf("error writing blocked peer to datastore: %s", err)
+			return err
 		}
 	}
+
+	cg.Lock()
+	defer cg.Unlock()
+	cg.blockedPeers[p] = struct{}{}
+
+	return nil
 }
 
 // UnblockPeer removes a peer from the set of blocked peers
-func (cg *BasicConnectionGater) UnblockPeer(p peer.ID) {
+func (cg *BasicConnectionGater) UnblockPeer(p peer.ID) error {
+	if cg.ds != nil {
+		err := cg.ds.Delete(datastore.NewKey(keyPeer + p.String()))
+		if err != nil {
+			log.Errorf("error deleting blocked peer from datastore: %s", err)
+			return err
+		}
+	}
+
 	cg.Lock()
 	defer cg.Unlock()
 
 	delete(cg.blockedPeers, p)
 
-	if cg.ds != nil {
-		err := cg.ds.Delete(datastore.NewKey(keyPeer + p.String()))
-		if err != nil {
-			log.Errorf("error deleting blocked peer from datastore: %s", err)
-		}
-	}
+	return nil
 }
 
 // ListBlockedPeers return a list of blocked peers
@@ -157,33 +167,39 @@ func (cg *BasicConnectionGater) ListBlockedPeers() []peer.ID {
 }
 
 // BlockAddr adds an IP address to the set of blocked addresses
-func (cg *BasicConnectionGater) BlockAddr(ip net.IP) {
+func (cg *BasicConnectionGater) BlockAddr(ip net.IP) error {
+	if cg.ds != nil {
+		err := cg.ds.Put(datastore.NewKey(keyAddr+ip.String()), []byte(ip))
+		if err != nil {
+			log.Errorf("error writing blocked addr to datastore: %s", err)
+			return err
+		}
+	}
+
 	cg.Lock()
 	defer cg.Unlock()
 
 	cg.blockedAddrs[ip.String()] = struct{}{}
 
-	if cg.ds != nil {
-		err := cg.ds.Put(datastore.NewKey(keyAddr+ip.String()), []byte(ip))
-		if err != nil {
-			log.Errorf("error writing blocked addr to datastore: %s", err)
-		}
-	}
+	return nil
 }
 
 // UnblockAddr removes an IP address from the set of blocked addresses
-func (cg *BasicConnectionGater) UnblockAddr(ip net.IP) {
+func (cg *BasicConnectionGater) UnblockAddr(ip net.IP) error {
+	if cg.ds != nil {
+		err := cg.ds.Delete(datastore.NewKey(keyAddr + ip.String()))
+		if err != nil {
+			log.Errorf("error deleting blocked addr from datastore: %s", err)
+			return err
+		}
+	}
+
 	cg.Lock()
 	defer cg.Unlock()
 
 	delete(cg.blockedAddrs, ip.String())
 
-	if cg.ds != nil {
-		err := cg.ds.Delete(datastore.NewKey(keyAddr + ip.String()))
-		if err != nil {
-			log.Errorf("error deleting blocked addr from datastore: %s", err)
-		}
-	}
+	return nil
 }
 
 // ListBlockedAddrs return a list of blocked IP addresses
@@ -201,33 +217,39 @@ func (cg *BasicConnectionGater) ListBlockedAddrs() []net.IP {
 }
 
 // BlockSubnet adds an IP subnet to the set of blocked addresses
-func (cg *BasicConnectionGater) BlockSubnet(ipnet *net.IPNet) {
+func (cg *BasicConnectionGater) BlockSubnet(ipnet *net.IPNet) error {
+	if cg.ds != nil {
+		err := cg.ds.Put(datastore.NewKey(keySubnet+ipnet.String()), []byte(ipnet.String()))
+		if err != nil {
+			log.Errorf("error writing blocked addr to datastore: %s", err)
+			return err
+		}
+	}
+
 	cg.Lock()
 	defer cg.Unlock()
 
 	cg.blockedSubnets[ipnet.String()] = ipnet
 
-	if cg.ds != nil {
-		err := cg.ds.Put(datastore.NewKey(keySubnet+ipnet.String()), []byte(ipnet.String()))
-		if err != nil {
-			log.Errorf("error writing blocked addr to datastore: %s", err)
-		}
-	}
+	return nil
 }
 
 // UnblockSubnet removes an IP address from the set of blocked addresses
-func (cg *BasicConnectionGater) UnblockSubnet(ipnet *net.IPNet) {
+func (cg *BasicConnectionGater) UnblockSubnet(ipnet *net.IPNet) error {
+	if cg.ds != nil {
+		err := cg.ds.Delete(datastore.NewKey(keySubnet + ipnet.String()))
+		if err != nil {
+			log.Errorf("error deleting blocked subnet from datastore: %s", err)
+			return err
+		}
+	}
+
 	cg.Lock()
 	defer cg.Unlock()
 
 	delete(cg.blockedSubnets, ipnet.String())
 
-	if cg.ds != nil {
-		err := cg.ds.Delete(datastore.NewKey(keySubnet + ipnet.String()))
-		if err != nil {
-			log.Errorf("error deleting blocked subnet from datastore: %s", err)
-		}
-	}
+	return nil
 }
 
 // ListBlockedSubnets return a list of blocked IP subnets