core-lightning/lightningd/log.h

#ifndef LIGHTNING_LIGHTNINGD_LOG_H
#define LIGHTNING_LIGHTNINGD_LOG_H
#include "config.h"
#include <ccan/list/list.h>
#include <ccan/tal/tal.h>
#include <ccan/time/time.h>
#include <ccan/typesafe_cb/typesafe_cb.h>
#include <common/status.h>
#include <common/type_to_string.h>
#include <jsmn.h>
#include <stdarg.h>

struct command;
struct json_stream;
struct lightningd;
struct timerel;

struct log_entry {
	struct list_node list;
	struct timeabs time;
	enum log_level level;
	unsigned int skipped;
	const char *prefix;
	char *log;
	/* Iff LOG_IO */
	const u8 *io;
};

struct log_book {
	size_t mem_used;
	size_t max_mem;
	void (*print)(const char *prefix,
		      enum log_level level,
		      bool continued,
		      const struct timeabs *time,
		      const char *str,
		      const u8 *io, size_t io_len,
		      void *arg);
	void *print_arg;
	enum log_level print_level;
	struct timeabs init_time;

	struct list_head log;
};

struct log {
	struct log_book *lr;
	const char *prefix;
};

/* We can have a single log book, with multiple logs in it: it's freed by
 * the last struct log itself. */
struct log_book *new_log_book(size_t max_mem,
			      enum log_level printlevel);

/* With different entry points */
struct log *new_log(const tal_t *ctx, struct log_book *record, const char *fmt, ...) PRINTF_FMT(3,4);

#define log_debug(log, ...) log_((log), LOG_DBG, __VA_ARGS__)
#define log_info(log, ...) log_((log), LOG_INFORM, __VA_ARGS__)
#define log_unusual(log, ...) log_((log), LOG_UNUSUAL, __VA_ARGS__)
#define log_broken(log, ...) log_((log), LOG_BROKEN, __VA_ARGS__)

void log_io(struct log *log, enum log_level dir, const char *comment,
	    const void *data, size_t len);

void log_(struct log *log, enum log_level level, const char *fmt, ...)
	PRINTF_FMT(3,4);
void log_add(struct log *log, const char *fmt, ...) PRINTF_FMT(2,3);
void logv(struct log *log, enum log_level level, const char *fmt, va_list ap);
void logv_add(struct log *log, const char *fmt, va_list ap);

enum log_level get_log_level(struct log_book *lr);
void set_log_level(struct log_book *lr, enum log_level level);
void set_log_prefix(struct log *log, const char *prefix);
const char *log_prefix(const struct log *log);
struct log_book *get_log_book(const struct log *log);

#define set_log_outfn(lr, print, arg)					\
	set_log_outfn_((lr),						\
		       typesafe_cb_preargs(void, void *, (print), (arg),\
					   const char *,		\
					   enum log_level,		\
					   bool,			\
					   const struct timeabs *,	\
					   const char *,		\
					   const u8 *, size_t), (arg))

/* If level == LOG_IO_IN/LOG_IO_OUT, then io contains data */
void set_log_outfn_(struct log_book *lr,
		    void (*print)(const char *prefix,
				  enum log_level level,
				  bool continued,
				  const struct timeabs *time,
				  const char *str,
				  const u8 *io, size_t io_len,
				  void *arg),
		    void *arg);

size_t log_max_mem(const struct log_book *lr);
size_t log_used(const struct log_book *lr);
const struct timeabs *log_init_time(const struct log_book *lr);

#define log_each_line(lr, func, arg)					\
	log_each_line_((lr),						\
		       typesafe_cb_preargs(void, void *, (func), (arg),	\
					   unsigned int,		\
					   struct timerel,		\
					   enum log_level,		\
					   const char *,		\
					   const char *,		\
					   const u8 *), (arg))

void log_each_line_(const struct log_book *lr,
		    void (*func)(unsigned int skipped,
				 struct timerel time,
				 enum log_level level,
				 const char *prefix,
				 const char *log,
				 const u8 *io,
				 void *arg),
		    void *arg);


void opt_register_logging(struct lightningd *ld);

char *arg_log_to_file(const char *arg, struct lightningd *ld);

/* Once this is set, we dump fatal with a backtrace to this log */
extern struct log *crashlog;
void NORETURN PRINTF_FMT(1,2) fatal(const char *fmt, ...);

void log_backtrace_print(const char *fmt, ...);
void log_backtrace_exit(void);

/* Adds an array showing log entries */
void json_add_log(struct json_stream *result,
		  const struct log_book *lr, enum log_level minlevel);

struct command_result *param_loglevel(struct command *cmd,
				      const char *name,
				      const char *buffer,
				      const jsmntok_t *tok,
				      enum log_level **level);

#endif /* LIGHTNING_LIGHTNINGD_LOG_H */