1 files changed, 34 insertions, 0 deletions
diff --git a/src/fetch-cache.js b/src/fetch-cache.js
new file mode 100644
index 0000000..3fb6830
--- /dev/null
+++ b/src/fetch-cache.js
@@ -0,0 +1,34 @@
+const cache = caches.default
+
+export async function fetchCache(opts) {
+  const { event, cacheKey, fetch: fetchResponse } = opts
+
+  let response
+
+  if (cacheKey) {
+    console.log('cacheKey', cacheKey.url)
+    response = await cache.match(cacheKey)
+  }
+
+  if (!response) {
+    response = await fetchResponse()
+    response = new Response(response.body, response)
+
+    if (cacheKey) {
+      if (response.headers.has('Cache-Control')) {
+        // cache will respect response headers
+        event.waitUntil(
+          cache.put(cacheKey, response.clone()).catch((err) => {
+            console.warn('cache put error', cacheKey, err)
+          })
+        )
+      }
+
+      response.headers.set('cf-cache-status', 'MISS')
+    } else {
+      response.headers.set('cf-cache-status', 'BYPASS')
+    }
+  }
+
+  return response
+}