generate-wire.py: generalize, move to tools.

We're going to want to use this for inter-daemon comms, so generalize it.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

Makefile

@@ -180,6 +180,8 @@ GEN_HEADERS := 	gen_version.h			\
 
 CDUMP_OBJS := ccan-cdump.o ccan-strmap.o
 
+WIRE_GEN := tools/generate-wire.py
+
 MANPAGES := doc/lightning-cli.1 \
 	doc/lightning-delinvoice.7 \
 	doc/lightning-getroute.7 \

daemon/p2p_announce.h

@@ -2,7 +2,7 @@
 #define LIGHTNING_DAEMON_P2P_ANNOUNCE_H
 #include "config.h"
 #include "lightningd.h"
-#include "wire/gen_wire.h"
+#include "wire/gen_peer_wire.h"
 
 void setup_p2p_announce(struct lightningd_state *dstate);
 

daemon/peer.h

@@ -14,7 +14,7 @@
 #include "netaddr.h"
 #include "protobuf_convert.h"
 #include "state.h"
-#include "wire/gen_wire.h"
+#include "wire/gen_peer_wire.h"
 #include <ccan/crypto/sha256/sha256.h>
 #include <ccan/crypto/shachain/shachain.h>
 #include <ccan/list/list.h>

tools/generate-wire.py

@@ -128,6 +128,9 @@ class Message(object):
         self.fields.append(field)
 
     def print_structure(self):
+        if not self.fields:
+            return
+
         print('struct msg_{} {{'.format(self.name));
 
         for f in self.fields:
@@ -142,6 +145,9 @@ class Message(object):
         print('};')
 
     def print_fromwire(self,is_header):
+        if not self.fields:
+            return
+
         print('struct msg_{0} *fromwire_{0}(const tal_t *ctx, const void *p, size_t *len)'.format(self.name), end='')
 
         if is_header:
@@ -185,6 +191,9 @@ class Message(object):
               '}\n')
    
     def print_towire(self,is_header):
+        if not self.fields:
+            return
+
         print('u8 *towire_{0}(const tal_t *ctx, const struct msg_{0} *out)'.format(self.name), end='')
 
         if is_header:
@@ -221,27 +230,31 @@ class Message(object):
 parser = OptionParser()
 parser.add_option("--header",
                   action="store_true", dest="output_header", default=False,
-                  help="Create gen_wire.h")
+                  help="Create wire header")
 
 (options, args) = parser.parse_args()
 
+if len(args) != 2:
+    parser.error("Expect headerfilename and enumname")
+
 if options.output_header:
-    print('#ifndef LIGHTNING_WIRE_GEN_WIRE_H\n'
-          '#define LIGHTNING_WIRE_GEN_WIRE_H\n'
+    idem = re.sub(r'[^A-Z]+', '_', args[0].upper())
+    print('#ifndef LIGHTNING_{0}\n'
+          '#define LIGHTNING_{0}\n'
           '#include <ccan/tal/tal.h>\n'
           '#include <wire/wire.h>\n'
           '\n'
           'typedef u8 pad;\n'
-          '')
+          ''.format(idem))
 else:
-    print('#include "gen_wire.h"\n'
-          '')
+    print('#include <{}>\n'
+          ''.format(args[0]))
 
 # Maps message names to messages
 messages = { }
 
 # Read csv lines.  Single comma is the message values, more is offset/len.
-for line in fileinput.input(args):
+for line in fileinput.input(args[2:]):
     parts = line.rstrip().split(',')
 
     if len(parts) == 2:
@@ -249,12 +262,14 @@ for line in fileinput.input(args):
         messages[parts[0]] = Message(parts[0],Enumtype("WIRE_" + parts[0].upper(), int(parts[1])))
     else:
         # eg commit_sig,0,channel-id,8
+        if not parts[0] in messages:
+            messages[parts[0]] = Message(parts[0],None)
         messages[parts[0]].addField(Field(parts[0], parts[2], parts[3]))
 
 if options.output_header:
     # Dump out enum, sorted by value order.
-    print('enum wire_type {')
-    for m in sorted(messages.values(),key=lambda x:x.enum.value):
+    print('enum {} {{'.format(args[1]))
+    for m in sorted([x for x in messages.values() if x.enum is not None],key=lambda x:x.enum.value):
         print('\t{} = {},'.format(m.enum.name, m.enum.value))
     print('};')
 
@@ -269,4 +284,4 @@ for m in messages.values():
     m.print_towire(options.output_header)
     
 if options.output_header:
-    print('#endif /* LIGHTNING_WIRE_GEN_WIRE_H */\n')
+    print('#endif /* LIGHTNING_{} */\n'.format(idem))

wire/Makefile

@@ -5,8 +5,8 @@ wire-wrongdir:
 	$(MAKE) -C .. wire-all
 
 WIRE_HEADERS := wire/wire.h
-WIRE_GEN_HEADERS := wire/gen_wire.h
-WIRE_GEN_SRC := wire/gen_wire.c
+WIRE_GEN_HEADERS := wire/gen_peer_wire.h
+WIRE_GEN_SRC := wire/gen_peer_wire.c
 WIRE_SRC := wire/fromwire.c	\
 		wire/towire.c
 
@@ -14,16 +14,16 @@ WIRE_OBJS := $(WIRE_SRC:.c=.o) $(WIRE_GEN_SRC:.c=.o)
 
 # They may not have the bolts.
 BOLT_EXTRACT=$(BOLTDIR)/tools/extract-formats.py
-wire/gen_wire_csv: FORCE
+wire/gen_peer_wire_csv: FORCE
 	@set -e; if [ -f $(BOLT_EXTRACT) ]; then for f in $(BOLTDIR)/*.md $(BOLT_EXTRACT); do if [ $$f -nt $@ -o ! -f $@ ]; then $(BOLT_EXTRACT) --message-fields --message-types --check-alignment $(BOLTDIR)/*.md > $@; break; fi; done; fi
 
-wire/gen_wire.h: wire/tools/generate-wire.py wire/gen_wire_csv
-	wire/tools/generate-wire.py --header < wire/gen_wire_csv > $@
+wire/gen_peer_wire.h: $(WIRE_GEN) wire/gen_peer_wire_csv
+	$(WIRE_GEN) --header $@ wire_type < wire/gen_peer_wire_csv > $@
 
-wire/gen_wire.c: wire/tools/generate-wire.py wire/gen_wire_csv
-	wire/tools/generate-wire.py < wire/gen_wire_csv > $@
+wire/gen_peer_wire.c: $(WIRE_GEN) wire/gen_peer_wire_csv
+	$(WIRE_GEN) ${@:.c=.h} wire_type < wire/gen_peer_wire_csv > $@
 
-wire/gen_wire.o: wire/gen_wire.h
+wire/gen_peer_wire.o: wire/gen_peer_wire.h
 
 check-source: $(WIRE_SRC:%=check-src-include-order/%) $(WIRE_HEADERS:%=check-hdr-include-order/%)
 
@@ -33,7 +33,7 @@ check-whitespace: $(WIRE_SRC:%=check-whitespace/%) $(WIRE_HEADERS:%=check-whites
 
 clean: wire-clean
 
-wire-all: wire/gen_wire.o wire/fromwire.o wire/towire.o
+wire-all: wire/gen_peer_wire.o wire/fromwire.o wire/towire.o
 
 wire-clean:
 	$(RM) $(WIRE_OBJS) $(WIRE_GEN_SRC) $(WIRE_GEN_HEADERS) towire.c fromwire.c

wire/test/run-peer-wire.c

@@ -1,4 +1,4 @@
-#include "../gen_wire.c"
+#include "../gen_peer_wire.c"
 
 void towire_pad_array_orig(u8 **pptr, const u8 *arr, size_t num);
 #define towire_pad_array towire_pad_array_orig