From b47a41541f9da29186523a5b7367894c304f3050 Mon Sep 17 00:00:00 2001
From: Enno Rehling <enno.rehling@gmail.com>
Date: Fri, 28 Sep 2018 21:43:20 +0200
Subject: [PATCH] write a new (expensive) in-memory db driver for orders.

---
 src/kernel/CMakeLists.txt |  2 +-
 src/kernel/db/critbit.c   | 72 ---------------------------------------
 src/kernel/db/memory.c    | 69 +++++++++++++++++++++++++++++++++++++
 3 files changed, 70 insertions(+), 73 deletions(-)
 delete mode 100644 src/kernel/db/critbit.c
 create mode 100644 src/kernel/db/memory.c

diff --git a/src/kernel/CMakeLists.txt b/src/kernel/CMakeLists.txt
index 562562d8a..756f691cc 100644
--- a/src/kernel/CMakeLists.txt
+++ b/src/kernel/CMakeLists.txt
@@ -1,7 +1,7 @@
 cmake_minimum_required(VERSION 2.6)
 project(kernel C)
 
-SET(_DBFILES db/critbit.c)
+SET(_DBFILES db/memory.c)
 
 IF(SQLITE3_FOUND)
 SET(_DBFILES db/sqlite.c)
diff --git a/src/kernel/db/critbit.c b/src/kernel/db/critbit.c
deleted file mode 100644
index 69bac159e..000000000
--- a/src/kernel/db/critbit.c
+++ /dev/null
@@ -1,72 +0,0 @@
-#include <platform.h>
-#include "driver.h"
-
-#include <kernel/orderdb.h>
-#include <util/log.h>
-
-#include <critbit.h>
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-
-static critbit_tree cb_orders = { 0 };
-static int auto_id = -1;
-
-struct cb_entry {
-    int id;
-    order_data *data;
-};
-
-order_data *db_driver_order_load(int id)
-{
-    void * match;
-
-    assert(id>0);
-    if (cb_find_prefix(&cb_orders, &id, sizeof(id), &match, 1, 0) > 0) {
-        struct cb_entry *ent = (struct cb_entry *)match;
-        order_data * od = ent->data;
-        ++od->_refcount;
-        return od;
-    }
-    return NULL;
-}
-
-int db_driver_order_save(order_data *od)
-{
-    struct cb_entry ent;
-
-    assert(od && od->_str);
-    ++od->_refcount;
-    ent.id = ++auto_id;
-    ent.data = od;
-    cb_insert(&cb_orders, &ent, sizeof(ent));
-    return ent.id;
-}
-
-int db_driver_faction_save(int id, int no, int turn, const char *email, const char *password)
-{
-    return -1;
-}
-
-static int free_data_cb(const void *match, const void *key, size_t keylen,
-    void *udata)
-{
-    struct cb_entry * ent = (struct cb_entry *)match;
-    order_data *od = ent->data;
-    odata_release(od);
-    return 0;
-}
-
-void db_driver_open(void)
-{
-    assert(auto_id == -1);
-    auto_id = 0;
-}
-
-void db_driver_close(void)
-{
-    cb_foreach(&cb_orders, NULL, 0, free_data_cb, NULL);
-    cb_clear(&cb_orders);
-    auto_id = -1;
-}
diff --git a/src/kernel/db/memory.c b/src/kernel/db/memory.c
new file mode 100644
index 000000000..5fbaade4c
--- /dev/null
+++ b/src/kernel/db/memory.c
@@ -0,0 +1,69 @@
+#include <platform.h>
+#include "driver.h"
+
+#include <util/log.h>
+#include <util/strings.h>
+
+#include <selist.h>
+
+#include <assert.h>
+#include <stdlib.h>
+#include <string.h>
+
+static selist * g_orders;
+static int auto_id = -1;
+
+struct order_data *db_driver_order_load(int id)
+{
+    void * match;
+
+    assert(id>0);
+    match = selist_get(g_orders, id - 1);
+    if (match) {
+        char * str = (char *)match;
+        struct order_data * od = NULL;
+        odata_create(&od, strlen(str), str);
+        return od;
+    }
+    return NULL;
+}
+
+int db_driver_order_save(const char * str)
+{
+    assert(str);
+    selist_push(&g_orders, str_strdup(str));
+    return ++auto_id;
+}
+
+int db_driver_faction_save(int id, int no, int turn, const char *email, const char *password)
+{
+    return -1;
+}
+
+static int free_data_cb(const void *match)
+{
+    char *str = (char *)match;
+    free(str);
+    return 0;
+}
+
+int db_driver_open(database_t db, const char *dbname)
+{
+    (void)dbname;
+    if (db == DB_SWAP) {
+        assert(auto_id == -1);
+        auto_id = 0;
+        return 0;
+    }
+    return -1;
+}
+
+void db_driver_close(database_t db)
+{
+    if (db == DB_SWAP) {
+        selist_foreach(g_orders, free_data_cb);
+        selist_free(g_orders);
+        g_orders = NULL;
+        auto_id = -1;
+    }
+}