From 8e7ba500330f81d187bb14284ba90144e32195f0 Mon Sep 17 00:00:00 2001
From: Oscar Najera <hi@oscarnajera.com>
Date: Sat, 7 Jun 2025 11:12:16 +0200
Subject: Refactor and export symbols

---
 geoip/ip.lisp | 50 ++++++++++++++++++++++++++++++--------------------
 1 file changed, 30 insertions(+), 20 deletions(-)

(limited to 'geoip/ip.lisp')

diff --git a/geoip/ip.lisp b/geoip/ip.lisp
index d97f5c2..2b69233 100644
--- a/geoip/ip.lisp
+++ b/geoip/ip.lisp
@@ -1,9 +1,16 @@
 ;;;; -*- mode: lisp -*-
 (defpackage :geoip
-  (:use :common-lisp :cffi :split-sequence))
+  (:use :common-lisp :cffi :split-sequence)
+  (:export
+   :get-in :parse-ip :query-ip
+   :make-mmdb :close-mmdb :with-mmdb))
 
 (in-package :geoip)
 
+(defun get-in (data &rest keys)
+  "Get nested value from alist/map structure"
+  (reduce (lambda (acc key) (cdr (assoc key acc :test #'equal))) keys :initial-value data))
+
 (defun parse-ipv4 (ip-address)
   (reduce (lambda (acc n)
             (assert (<= 0 n 255))
@@ -60,20 +67,17 @@
   (description nil :read-only t :type list))
 
 
-(defun get-val (alist key &key (test #'equal))
-  (cdr (assoc key alist :test test)))
-
 (defun make-metadata (data)
   (make-maxmind-database-metadata
-   :binary-format-major-version (get-val data :binary-format-major-version)
-   :binary-format-minor-version (get-val data :binary-format-minor-version)
-   :build-epoch (get-val data :build-epoch)
-   :database-type (get-val data :database-type)
-   :description (get-val data :description)
-   :ip-version (get-val data :ip-version)
-   :languages (get-val data :languages)
-   :node-count (get-val data :node-count)
-   :record-size (get-val data :record-size)))
+   :binary-format-major-version (get-in data :binary-format-major-version)
+   :binary-format-minor-version (get-in data :binary-format-minor-version)
+   :build-epoch (get-in data :build-epoch)
+   :database-type (get-in data :database-type)
+   :description (get-in data :description)
+   :ip-version (get-in data :ip-version)
+   :languages (get-in data :languages)
+   :node-count (get-in data :node-count)
+   :record-size (get-in data :record-size)))
 
 (defun metadata-marker-p (ptr offset)
   (loop for i below #.(length +metadata-marker+)
@@ -207,20 +211,26 @@
           when (> node node-count)
             return node)))
 
-(defun lookup-ip (mmdb ip-bits)
-  (alexandria:when-let ((record (record-value mmdb ip-bits)))
-    (with-slots (ptr data-offset node-count) mmdb
+(defun lookup-ip-bits (mmdb ip-bits)
+  (with-slots (ptr data-offset node-count) mmdb
+    (alexandria:when-let* ((record (record-value mmdb ip-bits))
+                           (offset (+ data-offset (- record node-count 16))))
       (mread-data
-       (make-db-reader
-        :db-ptr (inc-pointer ptr (+ data-offset (- record node-count 16)))
-        :head-ptr ptr
-        :data-offset data-offset)))))
+       (make-db-reader :db-ptr (inc-pointer ptr offset)
+                       :head-ptr ptr :data-offset data-offset)))))
 
 (defun integer-to-bits (n bit-count)
   "Convert integer to list of bits (MSB first)"
   (loop for i from (1- bit-count) downto 0
         collect (if (logbitp i n) 1 0)))
 
+(defun query-ip (mmdb ip-string)
+  (destructuring-bind (ip-v . ip-val) (parse-ip ip-string)
+    (with-slots (ip-version) mmdb
+      (when (and (= ip-version 4) (= ip-v 6))
+        (error "Can't query IPv6 address in IPv4 database"))
+      (lookup-ip-bits mmdb (integer-to-bits ip-val (if (= ip-version 4) 32 128))))))
+
 (defun mmap->mmdb (file ptr fd size)
   (let* ((metadata-start (find-metadata-start ptr size))
          (db-reader (make-db-reader :db-ptr (inc-pointer ptr metadata-start)))
-- 
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