src/lib-dict/dict.c

	dict.c revision fd1a8db8fa61f9c38f063f62753d1bfef0261e19
/* Copyright (c) 2005-2008 Dovecot authors, see the included COPYING file */

#include "lib.h"
#include "array.h"
#include "dict-sql.h"
#include "dict-private.h"

static ARRAY_DEFINE(dict_drivers, struct dict *);

static struct dict *dict_driver_lookup(const char *name)
{
    struct dict *const *dicts;
    unsigned int i, count;

    dicts = array_get(&dict_drivers, &count);
    for (i = 0; i < count; i++) {
        if (strcmp(dicts[i]->name, name) == 0)
            return dicts[i];
    }
    return NULL;
}

void dict_driver_register(struct dict *driver)
{
    if (!array_is_created(&dict_drivers))
        i_array_init(&dict_drivers, 8);

    if (dict_driver_lookup(driver->name) != NULL) {
        i_fatal("dict_driver_register(%s): Already registered",
            driver->name);
    }
    array_append(&dict_drivers, &driver, 1);
}

void dict_driver_unregister(struct dict *driver)
{
    struct dict *const *dicts;
    unsigned int i, count;

    dicts = array_get(&dict_drivers, &count);
    for (i = 0; i < count; i++) {
        if (dicts[i] == driver) {
            array_delete(&dict_drivers, i, 1);
            break;
        }
    }

    i_assert(i < count);

    if (array_count(&dict_drivers) == 0)
        array_free(&dict_drivers);
}

struct dict *dict_init(const char *uri, enum dict_data_type value_type,
               const char *username)
{
    struct dict *dict;
    const char *p, *name;

    i_assert(username != NULL);

    p = strchr(uri, ':');
    if (p == NULL) {
        i_error("Dictionary URI is missing ':': %s", uri);
        return NULL;
    }

    T_BEGIN {
        name = t_strdup_until(uri, p);
        dict = dict_driver_lookup(name);
        if (dict == NULL)
            i_error("Unknown dict module: %s", name);
    } T_END;

    return dict == NULL ? NULL :
        dict->v.init(dict, p+1, value_type, username);
}

void dict_deinit(struct dict **_dict)
{
    struct dict *dict = *_dict;

    *_dict = NULL;
    dict->v.deinit(dict);
}

static bool dict_key_prefix_is_valid(const char *key)
{
    return strncmp(key, DICT_PATH_SHARED, strlen(DICT_PATH_SHARED)) == 0 ||
        strncmp(key, DICT_PATH_PRIVATE, strlen(DICT_PATH_PRIVATE)) == 0;
}

int dict_lookup(struct dict *dict, pool_t pool, const char *key,
        const char **value_r)
{
    i_assert(dict_key_prefix_is_valid(key));
    return dict->v.lookup(dict, pool, key, value_r);
}

struct dict_iterate_context *
dict_iterate_init(struct dict *dict, const char *path,
          enum dict_iterate_flags flags)
{
    i_assert(dict_key_prefix_is_valid(path));
    return dict->v.iterate_init(dict, path, flags);
}

int dict_iterate(struct dict_iterate_context *ctx,
         const char **key_r, const char **value_r)
{
    return ctx->dict->v.iterate(ctx, key_r, value_r);
}

void dict_iterate_deinit(struct dict_iterate_context **_ctx)
{
    struct dict_iterate_context *ctx = *_ctx;

    *_ctx = NULL;
    ctx->dict->v.iterate_deinit(ctx);
}

struct dict_transaction_context *dict_transaction_begin(struct dict *dict)
{
    return dict->v.transaction_init(dict);
}

int dict_transaction_commit(struct dict_transaction_context **_ctx)
{
    struct dict_transaction_context *ctx = *_ctx;

    *_ctx = NULL;
    return ctx->dict->v.transaction_commit(ctx);
}

void dict_transaction_rollback(struct dict_transaction_context **_ctx)
{
    struct dict_transaction_context *ctx = *_ctx;

    *_ctx = NULL;
    ctx->dict->v.transaction_rollback(ctx);
}

void dict_set(struct dict_transaction_context *ctx,
          const char *key, const char *value)
{
    i_assert(dict_key_prefix_is_valid(key));

    ctx->dict->v.set(ctx, key, value);
    ctx->changed = TRUE;
}

void dict_unset(struct dict_transaction_context *ctx,
        const char *key)
{
    i_assert(dict_key_prefix_is_valid(key));

    ctx->dict->v.unset(ctx, key);
    ctx->changed = TRUE;
}

void dict_atomic_inc(struct dict_transaction_context *ctx,
             const char *key, long long diff)
{
    i_assert(dict_key_prefix_is_valid(key));

    if (diff != 0) {
        ctx->dict->v.atomic_inc(ctx, key, diff);
        ctx->changed = TRUE;
    }
}