status: add multiple levels of logging.

status_trace maps to status_debug.

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

common/status_levels.h

@@ -0,0 +1,52 @@
+#ifndef LIGHTNING_COMMON_STATUS_LEVELS_H
+#define LIGHTNING_COMMON_STATUS_LEVELS_H
+#include "config.h"
+
+enum log_level {
+	/* Logging all IO. */
+	LOG_IO,
+	/* Gory details which are mainly good for debugging. */
+	LOG_DBG,
+	/* Information about what's going in. */
+	LOG_INFORM,
+	/* That's strange... */
+	LOG_UNUSUAL,
+	/* That's really bad, we're broken. */
+	LOG_BROKEN
+};
+
+/* Special status code for tracing messages (subtract log_level). */
+#define STATUS_LOG_MIN (STATUS_LOG_MAX - LOG_BROKEN)
+#define STATUS_LOG_MAX (0x7FFF)
+
+/* Failure codes always have high bit set. */
+#define STATUS_FAIL 0x8000
+
+/* These are always followed by an ASCII string. */
+enum status_fail {
+	/*
+	 * These errors shouldn't happen:
+	 */
+	/* Master daemon sent unknown/malformed command, or fd failed */
+	STATUS_FAIL_MASTER_IO = STATUS_FAIL,
+
+	/* Hsmd sent unknown/malformed command, or fd failed */
+	STATUS_FAIL_HSM_IO,
+
+	/* Gossipd sent unknown/malformed command, or fd failed */
+	STATUS_FAIL_GOSSIP_IO,
+
+	/* Other internal error. */
+	STATUS_FAIL_INTERNAL_ERROR,
+
+	/*
+	 * These errors happen when the other peer misbehaves:
+	 */
+	/* I/O failure (probably they closed the socket) */
+	STATUS_FAIL_PEER_IO,
+
+	/* Peer did something else wrong */
+	STATUS_FAIL_PEER_BAD
+};
+
+#endif /* LIGHTNING_COMMON_STATUS_LEVELS_H */