mpv/common/msg.c

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/*
* This file is part of MPlayer.
*
* MPlayer is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* MPlayer is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with MPlayer; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <assert.h>
#include <pthread.h>
#include "talloc.h"
#include "bstr/bstr.h"
#include "compat/atomics.h"
#include "common/common.h"
#include "common/global.h"
#include "options/options.h"
#include "osdep/terminal.h"
#include "osdep/io.h"
#include "common/msg.h"
/* maximum message length of mp_msg */
#define MSGSIZE_MAX 6144
struct mp_log_root {
struct mpv_global *global;
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// --- protected by mp_msg_lock
char *msglevels;
bool smode; // slave mode compatibility glue
bool module;
// --- semi-atomic access
bool color;
int verbose;
bool force_stderr;
bool mute;
// --- must be accessed atomically
/* This is incremented every time the msglevels must be reloaded.
* (This is perhaps better than maintaining a globally accessible and
* synchronized mp_log tree.) */
int64_t reload_counter;
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int header; // indicate if last line printed ended with \n or \r
int statusline; // indicates if last line printed was a status line
};
struct mp_log {
struct mp_log_root *root;
const char *prefix;
const char *verbose_prefix;
int level;
int64_t reload_counter;
};
// Protects some (not all) state in mp_log_root
static pthread_mutex_t mp_msg_lock = PTHREAD_MUTEX_INITIALIZER;
static const struct mp_log null_log = {0};
struct mp_log *const mp_null_log = (struct mp_log *)&null_log;
static bool match_mod(const char *name, bstr mod)
{
if (bstr_equals0(mod, "all"))
return true;
// Path prefix matches
bstr b = bstr0(name);
return bstr_eatstart(&b, mod) && (bstr_eatstart0(&b, "/") || !b.len);
}
static void update_loglevel(struct mp_log *log)
{
pthread_mutex_lock(&mp_msg_lock);
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log->level = MSGL_STATUS + log->root->verbose; // default log level
// Stupid exception for the remains of -identify
if (match_mod(log->verbose_prefix, bstr0("identify")))
log->level = -1;
bstr s = bstr0(log->root->msglevels);
bstr mod;
int level;
while (mp_msg_split_msglevel(&s, &mod, &level) > 0) {
if (match_mod(log->verbose_prefix, mod))
log->level = level;
}
log->reload_counter = log->root->reload_counter;
pthread_mutex_unlock(&mp_msg_lock);
}
// Return whether the message at this verbosity level would be actually printed.
// Thread-safety: see mp_msg().
bool mp_msg_test(struct mp_log *log, int lev)
{
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mp_memory_barrier();
if (!log->root || log->root->mute)
return false;
if (lev == MSGL_STATUS) {
// skip status line output if stderr is a tty but in background
if (terminal_in_background())
return false;
}
if (log->reload_counter != log->root->reload_counter)
update_loglevel(log);
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return lev <= log->level || (log->root->smode && lev == MSGL_SMODE);
}
static void set_msg_color(FILE* stream, int lev)
{
static const int v_colors[] = {9, 1, 3, -1, -1, 2, 8, 8, -1};
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terminal_set_foreground_color(stream, v_colors[lev]);
}
void mp_msg_va(struct mp_log *log, int lev, const char *format, va_list va)
{
if (!mp_msg_test(log, lev))
return; // do not display
pthread_mutex_lock(&mp_msg_lock);
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struct mp_log_root *root = log->root;
FILE *stream = (root->force_stderr || lev == MSGL_STATUS) ? stderr : stdout;
char tmp[MSGSIZE_MAX];
if (vsnprintf(tmp, MSGSIZE_MAX, format, va) < 0)
snprintf(tmp, MSGSIZE_MAX, "[fprintf error]\n");
tmp[MSGSIZE_MAX - 2] = '\n';
tmp[MSGSIZE_MAX - 1] = 0;
/* A status line is normally intended to be overwritten by the next
* status line, and does not end with a '\n'. If we're printing a normal
* line instead after the status one print '\n' to change line. */
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if (root->statusline && lev != MSGL_STATUS)
fprintf(stderr, "\n");
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root->statusline = lev == MSGL_STATUS;
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if (root->color)
set_msg_color(stream, lev);
if (root->header) {
if ((lev >= MSGL_V && lev != MSGL_SMODE) || root->verbose || root->module) {
fprintf(stream, "[%s] ", log->verbose_prefix);
} else if (log->prefix) {
fprintf(stream, "[%s] ", log->prefix);
}
}
size_t len = strlen(tmp);
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root->header = len && (tmp[len - 1] == '\n' || tmp[len - 1] == '\r');
fprintf(stream, "%s", tmp);
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if (root->color)
terminal_set_foreground_color(stream, -1);
fflush(stream);
pthread_mutex_unlock(&mp_msg_lock);
}
// Create a new log context, which uses talloc_ctx as talloc parent, and parent
// as logical parent.
// The name is the prefix put before the output. It's usually prefixed by the
// parent's name. If the name starts with "/", the parent's name is not
// prefixed (except in verbose mode), and if it starts with "!", the name is
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// not printed at all (except in verbose mode).
// Thread-safety: fully thread-safe, but keep in mind that talloc is not (so
// talloc_ctx must be owned by the current thread).
struct mp_log *mp_log_new(void *talloc_ctx, struct mp_log *parent,
const char *name)
{
assert(parent);
assert(name);
struct mp_log *log = talloc_zero(talloc_ctx, struct mp_log);
if (!parent->root)
return log; // same as null_log
log->root = parent->root;
if (name[0] == '!') {
name = &name[1];
} else if (name[0] == '/') {
name = &name[1];
log->prefix = talloc_strdup(log, name);
} else {
log->prefix = parent->prefix
? talloc_asprintf(log, "%s/%s", parent->prefix, name)
: talloc_strdup(log, name);
}
log->verbose_prefix = parent->prefix
? talloc_asprintf(log, "%s/%s", parent->prefix, name)
: talloc_strdup(log, name);
if (log->prefix && !log->prefix[0])
log->prefix = NULL;
if (!log->verbose_prefix[0])
log->verbose_prefix = "global";
return log;
}
void mp_msg_init(struct mpv_global *global)
{
assert(!global->log);
struct mp_log_root *root = talloc_zero(NULL, struct mp_log_root);
root->global = global;
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root->header = 1;
root->reload_counter = 1;
struct mp_log dummy = { .root = root };
struct mp_log *log = mp_log_new(root, &dummy, "");
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global->log = log;
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mp_msg_update_msglevels(global);
}
void mp_msg_update_msglevels(struct mpv_global *global)
{
struct mp_log_root *root = global->log->root;
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struct MPOpts *opts = global->opts;
if (!opts)
return;
pthread_mutex_lock(&mp_msg_lock);
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root->verbose = opts->verbose;
root->module = opts->msg_module;
root->smode = opts->msg_identify;
root->color = opts->msg_color && isatty(fileno(stdout));
talloc_free(root->msglevels);
root->msglevels = talloc_strdup(root, global->opts->msglevels);
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mp_atomic_add_and_fetch(&root->reload_counter, 1);
mp_memory_barrier();
pthread_mutex_unlock(&mp_msg_lock);
}
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void mp_msg_mute(struct mpv_global *global, bool mute)
{
struct mp_log_root *root = global->log->root;
root->mute = mute;
}
void mp_msg_force_stderr(struct mpv_global *global, bool force_stderr)
{
struct mp_log_root *root = global->log->root;
root->force_stderr = force_stderr;
}
void mp_msg_uninit(struct mpv_global *global)
{
talloc_free(global->log->root);
global->log = NULL;
}
// Thread-safety: fully thread-safe, but keep in mind that the lifetime of
// log must be guaranteed during the call.
// Never call this from signal handlers.
void mp_msg(struct mp_log *log, int lev, const char *format, ...)
{
va_list va;
va_start(va, format);
mp_msg_va(log, lev, format, va);
va_end(va);
}
static const char *level_names[] = {
[MSGL_FATAL] = "fatal",
[MSGL_ERR] = "error",
[MSGL_WARN] = "warn",
[MSGL_INFO] = "info",
[MSGL_STATUS] = "status",
[MSGL_V] = "v",
[MSGL_DEBUG] = "debug",
[MSGL_TRACE] = "trace",
};
int mp_msg_split_msglevel(struct bstr *s, struct bstr *out_mod, int *out_level)
{
if (s->len == 0)
return 0;
bstr elem, rest;
bstr_split_tok(*s, ":", &elem, &rest);
bstr mod, level;
if (!bstr_split_tok(elem, "=", &mod, &level) || mod.len == 0)
return -1;
int ilevel = -1;
for (int n = 0; n < MP_ARRAY_SIZE(level_names); n++) {
if (level_names[n] && bstr_equals0(level, level_names[n])) {
ilevel = n;
break;
}
}
if (ilevel < 0 && !bstr_equals0(level, "no"))
return -1;
*s = rest;
*out_mod = mod;
*out_level = ilevel;
return 1;
}