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#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h> // unlink()
#include <errno.h>
#include <zsv/utils/cache.h>
#include <zsv/utils/jq.h>
#ifndef APPNAME
#define APPNAME "cache"
#endif
#include <zsv/utils/os.h>
#include <zsv/utils/err.h>
#include <zsv/utils/dirs.h>
#include <zsv/utils/file.h>
static const char *zsv_cache_type_name(enum zsv_cache_type t) {
switch (t) {
case zsv_cache_type_property:
return ZSV_CACHE_PROPERTIES_NAME ".json";
case zsv_cache_type_tag:
return "tag.json";
case zsv_cache_type_overwrite:
return "overwrite.sqlite3";
default:
return NULL;
}
}
unsigned char *zsv_cache_filepath(const unsigned char *data_filepath, enum zsv_cache_type type, char create_dir,
char temp_file) {
if (!data_filepath || !*data_filepath)
return NULL;
const char *cache_filename_base = zsv_cache_type_name(type);
if (!cache_filename_base) {
zsv_printerr(ENOMEM, "Out of memory!");
return NULL;
}
unsigned char *cache_filename;
asprintf((char **)&cache_filename, "%s%s", cache_filename_base, temp_file ? ZSV_TEMPFILE_SUFFIX : "");
unsigned char *s = cache_filename ? zsv_cache_path(data_filepath, cache_filename, 0) : NULL;
if (s && create_dir) {
char *last_slash_s = (char *)strrchr((void *)s, FILESLASH);
int err = 0;
// temporarily truncate the string so as to only leave its parent folder
*last_slash_s = '\0';
// ensure the parent dir exists
if (!zsv_dir_exists((char *)s))
err = zsv_mkdirs((char *)s, 0);
if (err) {
fprintf(stderr, "Unable to create cache directory %s\n", s);
free(s);
s = NULL;
} else
*last_slash_s = FILESLASH;
}
free(cache_filename);
return s;
}
/*
* print cache file to stdout
*/
int zsv_cache_print(const unsigned char *filepath, enum zsv_cache_type ctype, const unsigned char *default_value) {
int err = 0;
// to do: parse the json rather than just blindly regurgitating the file
unsigned char *cache_fn = zsv_cache_filepath(filepath, ctype, 0, 0);
if (cache_fn) {
FILE *f;
if (zsv_file_readable((char *)cache_fn, &err, &f)) {
char buff[1024];
size_t bytes;
while ((bytes = fread(buff, 1, sizeof(buff), f)))
fwrite(buff, 1, bytes, stdout);
fclose(f);
} else if (err == ENOENT) {
if (default_value)
printf("%s\n", default_value);
} else {
perror((const char *)cache_fn);
if (!err)
err = 1;
}
}
free(cache_fn);
return err;
}
/*
* remove a cache file
*/
int zsv_cache_remove(const unsigned char *filepath, enum zsv_cache_type ctype) {
int err = 0;
unsigned char *fn = zsv_cache_filepath(filepath, ctype, 0, 0);
if (!fn)
err = ENOMEM;
else if (zsv_file_readable((const char *)fn, &err, NULL)) {
err = unlink((const char *)fn);
if (err)
perror((const char *)fn);
} else if (err == ENOENT)
err = 0; // file d.n. exist, nothing to do
else
perror((const char *)fn);
free(fn);
return err;
}
/*
* modify a JSON cache file, write to tmp file, then replace the cache file
*/
int zsv_modify_cache_file(const unsigned char *filepath, enum zsv_cache_type ctype, const unsigned char *json_value1,
const unsigned char *json_value2, const unsigned char *filter) {
unsigned char *cache_fn = zsv_cache_filepath((const unsigned char *)filepath, ctype, 0, 0);
unsigned char *cache_tmp_fn = zsv_cache_filepath((const unsigned char *)filepath, ctype, 1, 1);
FILE *cache_data = NULL;
if (!(cache_fn && cache_tmp_fn))
return zsv_printerr(ENOMEM, "Out of memory!");
cache_data = zsv_fopen((void *)cache_fn, "rb");
int err = 0;
if (!cache_data) {
err = errno;
if (err == ENOENT)
err = 0;
else { // file exists but could not be opened
perror((const char *)cache_fn);
return err;
}
}
if (cache_data) {
// check that we have at least 1 byte of data
fseek(cache_data, 1, SEEK_SET);
if (!ftell(cache_data)) { // empty file; will use default value of "{}"
fclose(cache_data);
cache_data = NULL;
} else
fseek(cache_data, 0, SEEK_SET);
}
// jq filter to apply to [current_properties, id, value]
FILE *tmp = zsv_fopen((const char *)cache_tmp_fn, "wb");
if (!tmp) {
if (!(err = errno))
err = 1;
perror((const char *)cache_tmp_fn);
} else {
struct jv_to_json_ctx ctx = {0};
ctx.write1 = zsv_jq_fwrite1;
ctx.ctx = tmp;
ctx.flags = JV_PRINT_PRETTY | JV_PRINT_SPACE1;
enum zsv_jq_status jqstat;
void *jqh = zsv_jq_new(filter, jv_to_json_func, &ctx, &jqstat);
if (jqstat || !jqh)
err = zsv_printerr(-1, "Unable to initialize jq filter");
else if (!(jqstat = zsv_jq_parse(jqh, "[", 1))) {
if (cache_data)
jqstat = zsv_jq_parse_file(jqh, cache_data);
else
jqstat = zsv_jq_parse(jqh, "{}", 2);
if (!jqstat && !(jqstat = zsv_jq_parse(jqh, ",", 1)) &&
!(jqstat = zsv_jq_parse(jqh, json_value1, strlen((void *)json_value1))) &&
!(jqstat = zsv_jq_parse(jqh, ",", 1)) &&
!(jqstat = zsv_jq_parse(jqh, json_value2, strlen((void *)json_value2))) &&
!(jqstat = zsv_jq_parse(jqh, "]", 1)) && !(jqstat = zsv_jq_finish(jqh))) {
;
}
}
zsv_jq_delete(jqh);
if (cache_data) {
fclose(cache_data);
cache_data = NULL;
}
fclose(tmp);
if (!jqstat && zsv_replace_file(cache_tmp_fn, cache_fn)) {
err = zsv_printerr(-1, "Unable to save %s: ", cache_fn);
zsv_perror(NULL);
}
}
if (cache_data)
fclose(cache_data);
free(cache_fn);
free(cache_tmp_fn);
return err;
}
/**
* Returns the folder or file path to the cache for a given data file
* Caller must free the returned result
*/
unsigned char *zsv_cache_path(const unsigned char *data_filepath, const unsigned char *cache_filename, char temp_file) {
if (!data_filepath)
return NULL;
const unsigned char *last_slash = (void *)strrchr((void *)data_filepath, '/');
const unsigned char *last_backslash = (void *)strrchr((void *)data_filepath, '\\');
const unsigned char *dir_end = (!last_slash && !last_backslash ? NULL
: last_backslash > last_slash ? last_backslash
: last_slash);
char *s = NULL;
char *filename_suffix = NULL;
if (cache_filename)
asprintf(&filename_suffix, "%c%s%s", FILESLASH, cache_filename, temp_file ? ZSV_TEMPFILE_SUFFIX : "");
if (!dir_end) // file is in current dir
asprintf(&s, ZSV_CACHE_DIR "%c%s%s", FILESLASH, data_filepath, filename_suffix ? filename_suffix : "");
else if (dir_end[1]) {
asprintf(&s, "%.*s%c" ZSV_CACHE_DIR "%c%s%s", (int)(dir_end - data_filepath), data_filepath, FILESLASH, FILESLASH,
dir_end + 1, filename_suffix ? filename_suffix : "");
for (int i = 0; s && s[i]; i++)
if (s[i] != FILESLASH && (s[i] == '/' || s[i] == '\\'))
s[i] = FILESLASH;
}
free(filename_suffix);
return (unsigned char *)s;
}
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