nslcd_proto: BREAKING CHANGE: Rethink the panic strategy

nslcd_proto.Read() and .Write() panic() with any errors that they may
need to emit.  This made composition really simple, I was OK with it
being against the normal Go style.

But, I'm not happy with it anymore; have them return errors now.

This leads us in to nslcd_server.HandleRequest() using those panics
for control flow.  Add a maybePanic(error) function to wrap all of the
proto.Read() and proto.Write() calls to restore the panicing behavior.

1 files changed, 12 insertions, 12 deletions

diff --git a/nslcd_proto/nslcd_h.go b/nslcd_proto/nslcd_h.go
index cb210cd..d8eee9f 100644
--- a/nslcd_proto/nslcd_h.go
+++ b/nslcd_proto/nslcd_h.go
@@ -1,5 +1,5 @@
 // This file is based heavily on nslcd.h from nss-pam-ldapd
-// Copyright (C) 2015 Luke Shumaker
+// Copyright (C) 2015, 2017 Luke Shumaker
 /*
    nslcd.h - file describing client/server protocol
 
@@ -171,19 +171,19 @@ func (data Netgroup_PartList) nslcdWrite(fd io.Writer) {
 			t = NSLCD_NETGROUP_TYPE_TRIPLE
 		}
 		if t < 0 {
-			panic("unrecognized netgroup type")
+			panic(fmt.Sprintf("unrecognized netgroup type: %#08x", t))
 		}
-		Write(fd, t)
-		Write(fd, part)
+		write(fd, t)
+		write(fd, part)
 	}
-	Write(fd, NSLCD_NETGROUP_TYPE_END)
+	write(fd, NSLCD_NETGROUP_TYPE_END)
 }
 func (data *Netgroup_PartList) nslcdRead(fd io.Reader) {
 	*data = make([]interface{}, 0)
 	for {
 		var t int32
 		var v interface{}
-		Read(fd, &t)
+		read(fd, &t)
 		switch t {
 		case NSLCD_NETGROUP_TYPE_NETGROUP:
 			v = Netgroup_Netgroup{}
@@ -192,9 +192,9 @@ func (data *Netgroup_PartList) nslcdRead(fd io.Reader) {
 		case NSLCD_NETGROUP_TYPE_END:
 			return
 		default:
-			panic(NslcdError(fmt.Sprintf("unrecognized netgroup type: %#08x", t)))
+			npanic(NslcdError(fmt.Sprintf("unrecognized netgroup type: %#08x", t)))
 		}
-		Read(fd, &v)
+		read(fd, &v)
 		*data = append(*data, v)
 	}
 }
@@ -384,20 +384,20 @@ type UserMod_Item struct {
 type UserMod_ItemList []UserMod_Item
 func (data UserMod_ItemList) nslcdWrite(fd io.Writer) {
 	for _, item := range data {
-		Write(fd, item)
+		write(fd, item)
 	}
-	Write(fd, NSLCD_USERMOD_END)
+	write(fd, NSLCD_USERMOD_END)
 }
 func (data *UserMod_ItemList) nslcdRead(fd io.Reader) {
 	*data = make([]UserMod_Item, 0)
 	for {
 		var t int32
-		Read(fd, &t)
+		read(fd, &t)
 		if t == NSLCD_USERMOD_END {
 			return
 		}
 		var v UserMod_Item
-		Read(fd, &v)
+		read(fd, &v)
 		*data = append(*data, v)
 	}
 }