3x faster default path-parameter decoding

modules/reitit-core/src/reitit/impl.cljc

@@ -19,15 +19,16 @@
               (java.util HashMap Map)
               (java.net URLEncoder URLDecoder))))
 
-(defn map-kv
+(defn maybe-map-values
-  "Applies a function to every value of a map.
+  "Applies a function to every value of a map, updates the value if not nil.
-
   Also works on vectors. Maintains key for maps, order for vectors."
   [f coll]
   (reduce-kv
-    (fn [m k v]
+    (fn [coll k v]
-      (assoc m k (f v)))
+      (if-let [v' (f v)]
-    (empty coll)
+        (assoc coll k v')
+        coll))
+    coll
     coll))
 
 (defn wild? [s]
@@ -191,17 +192,19 @@
     #?(:clj  (str/replace s #"[^A-Za-z0-9\!'\(\)\*_~.-]+" percent-encode)
        :cljs (js/encodeURIComponent s))))
 
-(defn url-decode [s]
+(defn maybe-url-decode [s]
   (if s
     #?(:clj  (if (.contains ^String s "%")
                (URLDecoder/decode
                  (if (.contains ^String s "+")
                    (.replace ^String s "+" "%2B")
                    s)
-                 "UTF-8")
+                 "UTF-8"))
-               s)
        :cljs (js/decodeURIComponent s))))
 
+(defn url-decode [s]
+  (or (maybe-url-decode s) s))
+
 (defn form-encode [s]
   (if s
     #?(:clj  (URLEncoder/encode ^String s "UTF-8")
@@ -217,7 +220,7 @@
 (defn url-decode-coll
   "URL-decodes maps and vectors"
   [coll]
-  (map-kv url-decode coll))
+  (maybe-map-values maybe-url-decode coll))
 
 (defprotocol IntoString
   (into-string [_]))
@@ -251,7 +254,7 @@
 (defn path-params
   "Convert parameters' values into URL-encoded strings, suitable for URL paths"
   [params]
-  (map-kv #(url-encode (into-string %)) params))
+  (maybe-map-values #(url-encode (into-string %)) params))
 
 (defn query-string
   "shallow transform of query parameters into query string"

modules/reitit-core/src/reitit/segment.cljc

@@ -15,16 +15,16 @@
   (-lookup [_ _ _]))
 
 (defn- -catch-all [children catch-all path-params p ps]
-  (if catch-all
   (-lookup
     (impl/fast-get children catch-all)
     nil
-      (assoc path-params catch-all (str/join "/" (cons p ps))))))
+    (assoc path-params catch-all (str/join "/" (cons p ps)))))
 
 (defn- segment
   ([] (segment {} #{} nil nil))
   ([children wilds catch-all match]
-   (let [children' (impl/fast-map children)]
+   (let [children' (impl/fast-map children)
+         wilds? (seq wilds)]
      ^{:type ::segment}
      (reify
        Segment
@@ -40,8 +40,8 @@
          (if (nil? p)
            (when match (assoc match :path-params path-params))
            (or (-lookup (impl/fast-get children' p) ps path-params)
-               (some #(-lookup (impl/fast-get children' %) ps (assoc path-params % p)) wilds)
+               (if wilds? (some #(-lookup (impl/fast-get children' %) ps (assoc path-params % p)) wilds))
-               (-catch-all children' catch-all path-params p ps))))))))
+               (if catch-all (-catch-all children' catch-all path-params p ps)))))))))
 
 (defn insert [root path data]
   (-insert (or root (segment)) (impl/segments path) (map->Match {:data data})))

perf-test/clj/reitit/go_perf_test.clj

@@ -2,8 +2,7 @@
   (:require [criterium.core :as cc]
             [reitit.perf-utils :refer :all]
             [reitit.ring :as ring]
-            [clojure.string :as str]
+            [clojure.string :as str]))
-            [reitit.core :as r]))
 
 ;;
 ;; start repl with `lein perf repl`
@@ -313,6 +312,7 @@
 
   ;;  40ns (httprouter)
   ;; 140ns
+  ;; 120ns (faster decode params)
   (let [req (map->Req {:request-method :get, :uri "/user/repos"})]
     (title "static")
     (assert (= {:status 200, :body "/user/repos"} (app req)))
@@ -320,6 +320,7 @@
 
   ;; 160ns (httprouter)
   ;; 990ns
+  ;; 830ns (faster decode params)
   (let [req (map->Req {:request-method :get, :uri "/repos/julienschmidt/httprouter/stargazers"})]
     (title "param")
     (assert (= {:status 200, :body "/repos/:owner/:repo/stargazers"} (app req)))
@@ -327,6 +328,7 @@
 
   ;;  30µs (httprouter)
   ;; 190µs
+  ;; 160µs (faster decode params)
   (let [requests (mapv route->req routes)]
     (title "all")
     (cc/quick-bench

perf-test/clj/reitit/impl_perf_test.clj

@@ -2,7 +2,8 @@
   (:require [criterium.core :as cc]
             [reitit.perf-utils :refer :all]
             [ring.util.codec]
-            [reitit.impl])
+            [reitit.impl]
+            [reitit.impl :as impl])
   (:import (java.net URLDecoder URLEncoder)))
 
 ;;
@@ -163,8 +164,30 @@
                "1"]]
       (test! f s))))
 
+(defn url-encode-coll! []
+
+  (suite "url-encode-coll")
+
+  ;; 740ns
+  (test "something to decode")
+  (test! impl/url-decode-coll
+         {:a "aja%20hiljaa+sillalla"
+          :b "aja_hiljaa_sillalla"
+          :c "1+1"
+          :d "1"})
+
+  ;; 124ns
+  ;;  50ns (maybe-map-values)
+  (test "nothing to decode")
+  (test! impl/url-decode-coll
+         {:a "aja+20hiljaa+sillalla"
+          :b "aja_hiljaa_sillalla"
+          :c "1+1"
+          :d "1"}))
+
 (comment
   (url-decode!)
   (url-encode!)
   (form-decode!)
-  (form-encode!))
+  (form-encode!)
+  (url-encode-coll!))