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media-session: store config data as json objects

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So that we can use the json string escaping functions for keys
and use multiline config files.
This commit is contained in:
Wim Taymans 2020-12-01 12:05:08 +01:00
parent 19dc150643
commit e995d3a832
1 changed files with 45 additions and 30 deletions
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75
src/examples/media-session/media-session.c
View file

@ -35,6 +35,7 @@
#include <fcntl.h>
#include <signal.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <sys/types.h>
#if HAVE_PWD_H
#include <pwd.h>
@ -43,6 +44,7 @@
#include <spa/node/node.h>
#include <spa/utils/hook.h>
#include <spa/utils/result.h>
#include <spa/utils/json.h>
#include <spa/param/audio/format-utils.h>
#include <spa/param/props.h>
#include <spa/debug/pod.h>
@ -1833,8 +1835,9 @@ int sm_media_session_load_state(struct sm_media_session *sess,
const char *name, const char *prefix, struct pw_properties *props)
{
int sfd, fd, count = 0;
FILE *f;
char line[1024];
struct stat sbuf;
char *data, key[1024], *val;
struct spa_json it[2];
pw_log_info(NAME" %p: loading state '%s'", sess, name);
if ((sfd = state_dir(sess)) < 0)
@ -1844,27 +1847,38 @@ int sm_media_session_load_state(struct sm_media_session *sess,
pw_log_debug("can't open file %s: %m", name);
return -errno;
}
f = fdopen(fd, "r");
while (fgets(line, sizeof(line)-1, f)) {
char *val, *key, *k, *p;
val = strrchr(line, '\n');
if (val)
*val = '\0';
key = k = p = line;
while (*p) {
if (*p == ' ')
break;
if (*p == '\\')
p++;
*k++ = *p++;
}
*k = '\0';
val = ++p;
if (prefix == NULL || strstr(key, prefix) == key)
count += pw_properties_set(props, key, val);
if (fstat(fd, &sbuf) < 0) {
pw_log_debug("can't stat file %s: %m", name);
return -errno;
}
fclose(f);
if ((data = mmap(NULL, sbuf.st_size, PROT_READ, MAP_PRIVATE, fd, 0)) == MAP_FAILED) {
pw_log_debug("can't mmap file %s: %m", name);
return -errno;
}
spa_json_init(&it[0], data, strlen(data));
if (spa_json_enter_object(&it[0], &it[1]) < 0)
return 0;
while (spa_json_get_string(&it[1], key, sizeof(key)-1)) {
int len;
const char *value;
if ((len = spa_json_next(&it[1], &value)) <= 0)
break;
if (spa_json_is_container(value, len))
len = spa_json_container_len(&it[1], value, len);
if ((val = strndup(value, len)) == NULL)
break;
if (spa_json_is_string(value, len))
spa_json_parse_string(value, len, val);
count += pw_properties_set(props, key, val);
free(val);
}
munmap(data, sbuf.st_size);
return count;
}
@ -1888,17 +1902,18 @@ int sm_media_session_save_state(struct sm_media_session *sess,
}
f = fdopen(fd, "w");
fprintf(f, "{ \n");
spa_dict_for_each(it, &props->dict) {
const char *p = it->key;
if (prefix != NULL && strstr(p, prefix) != p)
char key[1024];
if (prefix != NULL && strstr(it->key, prefix) != it->key)
continue;
while (*p) {
if (*p == ' ' || *p == '\\')
fputc('\\', f);
fprintf(f, "%c", *p++);
}
fprintf(f, " %s\n", it->value);
if (spa_json_encode_string(key, sizeof(key)-1, it->key) >= (int)sizeof(key)-1)
continue;
fprintf(f, " %s: %s\n", key, it->value);
}
fprintf(f, "}\n");
fclose(f);
if (renameat(sfd, tmp_name, sfd, name) < 0) {