update urllib3

lib/urllib3/contrib/emscripten/emscripten_fetch_worker.js

@@ -0,0 +1,110 @@
+let Status = {
+  SUCCESS_HEADER: -1,
+  SUCCESS_EOF: -2,
+  ERROR_TIMEOUT: -3,
+  ERROR_EXCEPTION: -4,
+};
+
+let connections = {};
+let nextConnectionID = 1;
+const encoder = new TextEncoder();
+
+self.addEventListener("message", async function (event) {
+  if (event.data.close) {
+    let connectionID = event.data.close;
+    delete connections[connectionID];
+    return;
+  } else if (event.data.getMore) {
+    let connectionID = event.data.getMore;
+    let { curOffset, value, reader, intBuffer, byteBuffer } =
+      connections[connectionID];
+    // if we still have some in buffer, then just send it back straight away
+    if (!value || curOffset >= value.length) {
+      // read another buffer if required
+      try {
+        let readResponse = await reader.read();
+
+        if (readResponse.done) {
+          // read everything - clear connection and return
+          delete connections[connectionID];
+          Atomics.store(intBuffer, 0, Status.SUCCESS_EOF);
+          Atomics.notify(intBuffer, 0);
+          // finished reading successfully
+          // return from event handler
+          return;
+        }
+        curOffset = 0;
+        connections[connectionID].value = readResponse.value;
+        value = readResponse.value;
+      } catch (error) {
+        console.log("Request exception:", error);
+        let errorBytes = encoder.encode(error.message);
+        let written = errorBytes.length;
+        byteBuffer.set(errorBytes);
+        intBuffer[1] = written;
+        Atomics.store(intBuffer, 0, Status.ERROR_EXCEPTION);
+        Atomics.notify(intBuffer, 0);
+      }
+    }
+
+    // send as much buffer as we can
+    let curLen = value.length - curOffset;
+    if (curLen > byteBuffer.length) {
+      curLen = byteBuffer.length;
+    }
+    byteBuffer.set(value.subarray(curOffset, curOffset + curLen), 0);
+
+    Atomics.store(intBuffer, 0, curLen); // store current length in bytes
+    Atomics.notify(intBuffer, 0);
+    curOffset += curLen;
+    connections[connectionID].curOffset = curOffset;
+
+    return;
+  } else {
+    // start fetch
+    let connectionID = nextConnectionID;
+    nextConnectionID += 1;
+    const intBuffer = new Int32Array(event.data.buffer);
+    const byteBuffer = new Uint8Array(event.data.buffer, 8);
+    try {
+      const response = await fetch(event.data.url, event.data.fetchParams);
+      // return the headers first via textencoder
+      var headers = [];
+      for (const pair of response.headers.entries()) {
+        headers.push([pair[0], pair[1]]);
+      }
+      let headerObj = {
+        headers: headers,
+        status: response.status,
+        connectionID,
+      };
+      const headerText = JSON.stringify(headerObj);
+      let headerBytes = encoder.encode(headerText);
+      let written = headerBytes.length;
+      byteBuffer.set(headerBytes);
+      intBuffer[1] = written;
+      // make a connection
+      connections[connectionID] = {
+        reader: response.body.getReader(),
+        intBuffer: intBuffer,
+        byteBuffer: byteBuffer,
+        value: undefined,
+        curOffset: 0,
+      };
+      // set header ready
+      Atomics.store(intBuffer, 0, Status.SUCCESS_HEADER);
+      Atomics.notify(intBuffer, 0);
+      // all fetching after this goes through a new postmessage call with getMore
+      // this allows for parallel requests
+    } catch (error) {
+      console.log("Request exception:", error);
+      let errorBytes = encoder.encode(error.message);
+      let written = errorBytes.length;
+      byteBuffer.set(errorBytes);
+      intBuffer[1] = written;
+      Atomics.store(intBuffer, 0, Status.ERROR_EXCEPTION);
+      Atomics.notify(intBuffer, 0);
+    }
+  }
+});
+self.postMessage({ inited: true });