lightningd/crypto_sync: trace all messages, especually failures.

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

lightningd/crypto_sync.c

@@ -1,6 +1,10 @@
 #include <ccan/read_write_all/read_write_all.h>
+#include <errno.h>
+#include <inttypes.h>
 #include <lightningd/crypto_sync.h>
 #include <lightningd/cryptomsg.h>
+#include <status.h>
+#include <utils.h>
 #include <wire/wire_sync.h>
 
 bool sync_crypto_write(struct crypto_state *cs, int fd, const void *msg)
@@ -8,6 +12,8 @@ bool sync_crypto_write(struct crypto_state *cs, int fd, const void *msg)
 	u8 *enc = cryptomsg_encrypt_msg(msg, cs, msg);
 	bool ret;
 
+	status_trace("Writing crypto with sn=%"PRIu64" msg=%s",
+		     cs->sn-2, tal_hex(trc, msg));
 	ret = write_all(fd, enc, tal_len(enc));
 	tal_free(enc);
 	return ret;
@@ -18,17 +24,27 @@ u8 *sync_crypto_read(const tal_t *ctx, struct crypto_state *cs, int fd)
 	u8 hdr[18], *enc, *dec;
 	u16 len;
 
-	if (!read_all(fd, hdr, sizeof(hdr)))
+	if (!read_all(fd, hdr, sizeof(hdr))) {
+		status_trace("Failed reading header: %s", strerror(errno));
 		return NULL;
+	}
 
-	if (!cryptomsg_decrypt_header(cs, hdr, &len))
+	if (!cryptomsg_decrypt_header(cs, hdr, &len)) {
+		status_trace("Failed hdr decrypt with rn=%"PRIu64, cs->rn-1);
 		return NULL;
+	}
 
 	enc = tal_arr(ctx, u8, len + 16);
-	if (!read_all(fd, enc, tal_len(enc)))
+	if (!read_all(fd, enc, tal_len(enc))) {
+		status_trace("Failed reading body: %s", strerror(errno));
 		return tal_free(enc);
+	}
 
 	dec = cryptomsg_decrypt_body(ctx, cs, enc);
 	tal_free(enc);
+	if (!dec)
+		status_trace("Failed body decrypt with rn=%"PRIu64, cs->rn-2);
+	else
+		status_trace("Read decrypt %s", tal_hex(trc, dec));
 	return dec;
 }