Progress with web version

1 files changed, 32 insertions, 3 deletions

diff --git a/web/storage.cpp b/web/storage.cpp
index 4d0959f..cbf9e9c 100644
--- a/web/storage.cpp
+++ b/web/storage.cpp
@@ -13,13 +13,12 @@ std::string getprefix() {
 }
 
 EM_ASYNC_JS(int, loadfs, (), {
-        const dir = '/tables';
         const inBrowser = typeof window !== 'undefined';
         const inWorker = typeof WorkerGlobalScope !== 'undefined' &&
             self instanceof WorkerGlobalScope;
+        console.assert(inBrowser || inWorker, "Non-browsers not supported");
 
-        if (!(inBrowser || inWorker))
-                return;
+        const dir = '/tables';
 
         if (!FS.analyzePath(dir).exists)
                 FS.mkdir(dir);
@@ -38,6 +37,30 @@ EM_ASYNC_JS(int, loadfs, (), {
         }
 });
 
+EM_ASYNC_JS(int, download_and_store, (const char *key, const char *url), {
+        const inBrowser = typeof window !== 'undefined';
+        const inWorker = typeof WorkerGlobalScope !== 'undefined' &&
+            self instanceof WorkerGlobalScope;
+        console.assert(inBrowser || inWorker, "Non-browsers not supported");
+
+        url = UTF8ToString(url);
+        key = UTF8ToString(key);
+        let response = await fetch(url);
+        if (!response.ok) {
+                console.log("Error downloading data for " + key);
+                console.log("" + response.status + ": " + response.statusText);
+                return 0;
+        }
+
+        console.log("Data for " + key + " downloaded, writing to storage...");
+        let data = await response.bytes();
+        var stream = FS.open("/tables/" + key, "w+");
+        FS.write(stream, data, 0, data.length, 0);
+        FS.close(stream);
+        console.log("Data for " + key + " stored (" + data.length + " bytes)");
+        return 1;
+});
+
 bool storage::read(std::string key, size_t data_size, char *data)
 {
         loadfs();
@@ -65,3 +88,9 @@ bool storage::write(std::string key, size_t data_size, const char *data)
 
         return !ofs.fail();
 }
+
+int storage::download(std::string key, std::string url)
+{
+        loadfs();
+        return download_and_store(key.c_str(), url.c_str());
+}