Initial upload of cronet for Android.

net/cronet/android/org_chromium_net_UrlRequest.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "net/cronet/android/org_chromium_net_UrlRequest.h"

[szym, 2014/02/28 00:50:40]

After reading some more on the
https://code.google.com/p/chromium/codesearch#chromium/src/base/android/jni_g...
, I think you should use it to generate the bindings between UrlRequest.java and
the native implementation.

The native UrlRequest.h would be:

class UrlRequest {
 public:
  void Init(JNIEnv* env, jobject, jobject request_context, jstring url, jint
priority);
  void AddHeader(JNIEnv* env, jobject, jstring name, jstring value);
  ...
  jint GetErrorCode(JNIEnv* env, jobject obj);
  ...
 private:
  scoped_ptr<net::URLRequest> request_;
};

And in UrlRequest.java you would have

native void nativeInit(long nativeUrlRequest, Object request_context, String
url, int priority);
native void nativeAddHeader(long nativeUrlRequest, String name, String value);
...
native int nativeGetErrorCode(long nativeUrlRequest);


This should reduce a lot of error-prone boiler plate code. That said, it's
non-trivial amount of work, so probably ok to punt until subsequent CL. I'd
leave a TODO+crbug though.

[mef, 2014/03/03 19:15:13]

Sounds good. Added TODO for now.

+
+#include <stdio.h>
+
+#include "net/base/net_errors.h"
+#include "net/base/request_priority.h"
+#include "net/cronet/android/org_chromium_net_UrlRequestContext.h"
+#include "net/cronet/android/url_request_context_peer.h"
+#include "net/cronet/android/url_request_peer.h"
+
+#define LOG_TAG "ChromiumNetwork"

[mmenke, 2014/02/27 23:06:02]

this isn't used in this file

[mef, 2014/03/03 19:15:13]

Done.

+
+static jclass g_class;
+static jmethodID g_method_finish;
+static jmethodID g_method_onAppendChunkCompleted;
+static jmethodID g_method_onResponseStarted;
+static jmethodID g_method_onReadBytes;
+static jclass g_class_OutputStream;
+static jmethodID g_method_write;
+static jfieldID g_request_field;

[mmenke, 2014/02/27 23:06:02]

Suggest just putting all these in an anonymous namespace.

[mmenke, 2014/02/27 23:06:02]

Most of these names violate the Google C++ style guide.  Suggest just renaming
them something like g_on_blah_[id | method | method_id].

Be great if we could make them no longer globals, but I don't think we should
worry about that for now.

[mef, 2014/03/03 19:15:13]

Done.

[mef, 2014/03/03 19:15:13]

I'll address this as part of migration to generated jni headers.

+
+// Find Java classes and retain them.
+bool UrlRequestRegisterJni(JNIEnv* env) {
+  g_class = (jclass) env->NewGlobalRef(
+      env->FindClass("org/chromium/net/UrlRequest"));
+  g_method_finish = env->GetMethodID(g_class, "finish", "()V");
+  g_method_onAppendChunkCompleted =
+      env->GetMethodID(g_class, "onAppendChunkCompleted", "()V");
+  g_method_onResponseStarted =
+      env->GetMethodID(g_class, "onResponseStarted", "()V");
+  g_method_onReadBytes = env->GetMethodID(g_class, "onBytesRead",
+                                          "(Ljava/nio/ByteBuffer;)V");
+  g_request_field = env->GetFieldID(g_class, "mRequest", "J");
+
+  g_class_OutputStream = (jclass) env->NewGlobalRef(
+      env->FindClass("java/io/OutputStream"));
+  g_method_write = env->GetMethodID(g_class_OutputStream, "write", "([BII)V");
+
+  if (!g_class
+      || !g_method_finish
+      || !g_method_onAppendChunkCompleted
+      || !g_method_onResponseStarted
+      || !g_method_onReadBytes
+      || !g_request_field
+      || !g_class_OutputStream
+      || !g_method_write) {

[mmenke, 2014/02/27 23:06:02]

While this is the right style for Java, and allowed in C++, the "||" are pretty
much always put on the previous line in Chrome.

[mef, 2014/03/03 19:15:13]

Done.

+    return false;
+  }
+  return true;
+}
+
+static net::RequestPriority ConvertRequestPriority(jint request_priority) {

[mmenke, 2014/02/27 23:06:02]

static is not used very often before functions in chrome, suggest an anonymous
namespace instead (And putting it above UrlRequestRegisterJni).

[mef, 2014/03/03 19:15:13]

Done.

+  switch (request_priority) {
+    case REQUEST_PRIORITY_IDLE: return net::IDLE;
+    case REQUEST_PRIORITY_LOWEST: return net::LOWEST;
+    case REQUEST_PRIORITY_LOW: return net::LOW;
+    case REQUEST_PRIORITY_MEDIUM: return net::MEDIUM;
+    case REQUEST_PRIORITY_HIGHEST: return net::HIGHEST;
+    default: return net::LOWEST;

[mmenke, 2014/02/27 23:06:02]

Put all the returns on the next lines.

[mef, 2014/03/03 19:15:13]

Done.

+  }
+}
+
+/*
+ * A delegate of URLRequestPeer that delivers callbacks to the Java layer.
+ */

[mmenke, 2014/02/27 23:06:02]

Use C++-style comments.  (Goes for entire file)

[mef, 2014/03/03 19:15:13]

Done.

+class JniURLRequestPeerDelegate :
+    public URLRequestPeer::URLRequestPeerDelegate {
+  jobject owner_;
+  JavaVM* vm_;

[mmenke, 2014/02/27 23:06:02]

These should go in a private section at the bottom of the class.

[mef, 2014/03/03 19:15:13]

Done.

+
+ public:
+  JniURLRequestPeerDelegate(JNIEnv* env, jobject owner) {
+    owner_ = env->NewGlobalRef(owner);
+    env->GetJavaVM(&vm_);
+  }
+
+  virtual void OnAppendChunkCompleted(URLRequestPeer* request) OVERRIDE {
+    JNIEnv* env = GetEnv(vm_);
+    env->CallVoidMethod(owner_, g_method_onAppendChunkCompleted);
+    if (env->ExceptionOccurred()) {
+      env->ExceptionDescribe();
+      env->ExceptionClear();
+    }
+  }
+
+  virtual void OnResponseStarted(URLRequestPeer* request) OVERRIDE {
+    JNIEnv* env = GetEnv(vm_);
+    env->CallVoidMethod(owner_, g_method_onResponseStarted);
+    if (env->ExceptionOccurred()) {
+      env->ExceptionDescribe();
+      env->ExceptionClear();
+    }
+  }
+
+  virtual void OnBytesRead(URLRequestPeer* request) OVERRIDE {
+    int bytes_read = request->BytesRead();
+    if (bytes_read != 0) {
+      JNIEnv* env = GetEnv(vm_);
+      jobject bytebuf = env->NewDirectByteBuffer(request->Data(), bytes_read);
+      env->CallVoidMethod(owner_, g_method_onReadBytes, bytebuf);
+      env->DeleteLocalRef(bytebuf);
+      if (env->ExceptionOccurred()) {
+        env->ExceptionDescribe();
+        env->ExceptionClear();
+      }
+    }
+  }
+
+  virtual void OnRequestFinished(URLRequestPeer* request) OVERRIDE {
+    JNIEnv* env = GetEnv(vm_);
+    env->CallVoidMethod(owner_, g_method_finish);
+    if (env->ExceptionOccurred()) {
+      env->ExceptionDescribe();
+      env->ExceptionClear();
+    }
+  }
+
+ protected:
+  virtual ~JniURLRequestPeerDelegate() {
+    GetEnv(vm_)->DeleteGlobalRef(owner_);
+  }
+};
+
+/*
+ * Stores a reference to the request in a java field.

[mmenke, 2014/02/27 23:06:02]

Should Java be capitalized in comments?

[mef, 2014/03/03 19:15:13]

Done.

+ */
+static void SetNativeObject(JNIEnv *env, jobject object,

[mmenke, 2014/02/27 23:06:02]

Static methods should be moved to the anonymous namespace up top (And can get
rid of the static)

[mef, 2014/03/03 19:15:13]

Done.

+                            URLRequestPeer* request) {
+  env->SetLongField(object, g_request_field,
+                    reinterpret_cast<jlong>(request));
+}
+
+/*
+ * Returns a reference to the request, which is stored in a field of
+ * the java object.
+ */
+static URLRequestPeer* GetNativeObject(JNIEnv* env, jobject object) {
+  return reinterpret_cast<URLRequestPeer *>(
+      env->GetLongField(object, g_request_field));
+}
+
+JNIEXPORT void JNICALL
+Java_org_chromium_net_UrlRequest_nativeInit(

[mmenke, 2014/02/27 23:06:02]

Maybe be able to move all these up a line.  

[mef, 2014/03/03 19:15:13]

Done.

+    JNIEnv* env, jobject object, jobject request_context, jstring url_string,
+    jint priority) {
+  URLRequestContextPeer* context =
+      GetURLRequestContextPeer(env, request_context);
+  CHECK(context != NULL);

[mmenke, 2014/02/27 23:06:02]

DCHECK?

[mef, 2014/03/03 19:15:13]

Done.

+
+  const char *url_utf8 = env->GetStringUTFChars(url_string, NULL);

[mmenke, 2014/02/27 23:06:02]

Should be char* url_utf8.

[mef, 2014/03/03 19:15:13]

Done.

+
+  DVLOG(context->logging_level())
+      << "New chromium network request. URL:" << url_utf8;
+
+  GURL url(url_utf8);
+
+  env->ReleaseStringUTFChars(url_string, url_utf8);
+
+  URLRequestPeer* request =
+      new URLRequestPeer(context, new JniURLRequestPeerDelegate(env, object),
+                          url, ConvertRequestPriority(priority));
+
+  SetNativeObject(env, object, request);
+}
+
+/* synchronized */
+JNIEXPORT void JNICALL
+Java_org_chromium_net_UrlRequest_nativeAddHeader(
+    JNIEnv* env, jobject object, jstring name, jstring value) {
+  URLRequestPeer* request = GetNativeObject(env, object);
+  CHECK(request != NULL);

[mmenke, 2014/02/27 23:06:02]

DCHECK?

[mef, 2014/03/03 19:15:13]

Done.

+
+  const char *name_utf8 = env->GetStringUTFChars(name, NULL);
+  std::string name_string(name_utf8);
+  env->ReleaseStringUTFChars(name, name_utf8);
+
+  const char *value_utf8 = env->GetStringUTFChars(value, NULL);
+  std::string value_string(value_utf8);
+  env->ReleaseStringUTFChars(value, value_utf8);
+
+  request->AddHeader(name_string, value_string);
+}
+
+static void SetPostContentType(JNIEnv *env, URLRequestPeer* request,
+                               jstring content_type) {

[mmenke, 2014/02/27 23:06:02]

Statics up top, -static

[mef, 2014/03/03 19:15:13]

Done.

+  CHECK(request != NULL);

[mmenke, 2014/02/27 23:06:02]

DCHECK?

[mef, 2014/03/03 19:15:13]

Done.

+
+  std::string method_post("POST");
+  request->SetMethod(method_post);
+
+  std::string content_type_header("Content-Type");
+
+  const char *content_type_utf8 = env->GetStringUTFChars(content_type, NULL);

[mmenke, 2014/02/27 23:06:02]

char* content_...

[mef, 2014/03/03 19:15:13]

Done.

+  std::string content_type_string(content_type_utf8);
+  env->ReleaseStringUTFChars(content_type, content_type_utf8);
+
+  request->AddHeader(content_type_header, content_type_string);
+}
+
+JNIEXPORT void JNICALL
+Java_org_chromium_net_UrlRequest_nativeSetPostData(
+    JNIEnv* env, jobject object, jstring content_type, jbyteArray content) {
+  URLRequestPeer* request = GetNativeObject(env, object);
+  SetPostContentType(env, request, content_type);
+
+  if (content != NULL) {
+    jsize size = env->GetArrayLength(content);
+    if (size > 0) {
+      jbyte* content_bytes = env->GetByteArrayElements(content, NULL);
+      request->SetPostContent(reinterpret_cast<const char*>(content_bytes),
+                              size);
+      env->ReleaseByteArrayElements(content, content_bytes, 0);
+    }
+  }
+}
+
+JNIEXPORT void JNICALL
+Java_org_chromium_net_UrlRequest_nativeBeginChunkedUpload(
+    JNIEnv* env, jobject object, jstring content_type) {
+  URLRequestPeer* request = GetNativeObject(env, object);
+  SetPostContentType(env, request, content_type);
+
+  request->EnableStreamingUpload();
+}
+
+JNIEXPORT void JNICALL
+Java_org_chromium_net_UrlRequest_nativeAppendChunk(
+    JNIEnv* env, jobject object, jobject chunk_byte_buffer, jint chunk_size,
+    jboolean is_last_chunk) {
+  URLRequestPeer* request = GetNativeObject(env, object);
+  CHECK(request != NULL);
+
+  if (chunk_byte_buffer != NULL) {
+    void* chunk = env->GetDirectBufferAddress(chunk_byte_buffer);
+    request->AppendChunk(reinterpret_cast<const char*>(chunk),
+                         chunk_size, is_last_chunk);
+  }
+}
+
+/* synchronized */
+JNIEXPORT void JNICALL
+Java_org_chromium_net_UrlRequest_nativeStart(
+    JNIEnv* env, jobject object) {
+  URLRequestPeer* request = GetNativeObject(env, object);
+  if (request != NULL) {
+    request->Start();
+  }
+}
+
+/* synchronized */
+JNIEXPORT void JNICALL
+Java_org_chromium_net_UrlRequest_nativeRecycle(
+    JNIEnv* env, jobject object) {
+  URLRequestPeer* request = GetNativeObject(env, object);
+  if (request != NULL) {
+    request->Destroy();
+  }
+
+  SetNativeObject(env, object, NULL);
+}
+
+/* synchronized */
+JNIEXPORT void JNICALL
+Java_org_chromium_net_UrlRequest_nativeCancel(
+    JNIEnv* env, jobject object) {
+  URLRequestPeer* request = GetNativeObject(env, object);
+  if (request != NULL) {
+    request->Cancel();
+  }
+}
+
+JNIEXPORT jint JNICALL
+Java_org_chromium_net_UrlRequest_nativeGetErrorCode(
+    JNIEnv* env, jobject object) {
+  URLRequestPeer* request = GetNativeObject(env, object);
+  int error_code = request->error_code();
+  switch (error_code) {
+    case 0:

[mmenke, 2014/02/27 23:06:02]

case net::OK:

[mmenke, 2014/02/27 23:06:02]

Please add a TODO about investigating returning success on positive values, too,
as they technically indicate success.

[mef, 2014/03/03 19:15:13]

Done.

[mef, 2014/03/03 19:15:13]

Done.

+      return ERROR_SUCCESS;
+
+    // Comment from src/content/browser/download/download_resource_handler.cc:
+    // ERR_CONTENT_LENGTH_MISMATCH and ERR_INCOMPLETE_CHUNKED_ENCODING are
+    // allowed since a number of servers in the wild close the connection too
+    // early by mistake. Other browsers - IE9, Firefox 11.0, and Safari 5.1.4 -
+    // treat downloads as complete in both cases, so we follow their lead.

[mmenke, 2014/02/27 23:06:02]

Add a TODO about investigating this.  The fact is that Chrome does not do this,
and this library is not just being used for downloads.

[mef, 2014/03/03 19:15:13]

Done.

+    case net::ERR_CONTENT_LENGTH_MISMATCH:
+    case net::ERR_INCOMPLETE_CHUNKED_ENCODING:
+      return ERROR_SUCCESS;
+
+    case net::ERR_INVALID_URL:
+    case net::ERR_DISALLOWED_URL_SCHEME:
+    case net::ERR_UNKNOWN_URL_SCHEME:
+      return ERROR_MALFORMED_URL;
+
+    case net::ERR_CONNECTION_TIMED_OUT:
+      return ERROR_CONNECTION_TIMED_OUT;
+
+    case net::ERR_NAME_NOT_RESOLVED:
+      return ERROR_UNKNOWN_HOST;
+  }
+  return ERROR_UNKNOWN;
+}
+
+JNIEXPORT jstring JNICALL
+Java_org_chromium_net_UrlRequest_nativeGetErrorString(
+    JNIEnv* env, jobject object) {
+  int error_code = GetNativeObject(env, object)->error_code();
+  char buffer[200];
+  snprintf(buffer, sizeof(buffer), "System error: %s(%d)",
+           net::ErrorToString(error_code), error_code);
+  return env->NewStringUTF(buffer);
+}
+
+JNIEXPORT jint JNICALL
+Java_org_chromium_net_UrlRequest_getHttpStatusCode(
+    JNIEnv* env, jobject object) {
+  return GetNativeObject(env, object)->http_status_code();
+}
+
+JNIEXPORT jstring JNICALL
+Java_org_chromium_net_UrlRequest_nativeGetContentType(
+    JNIEnv* env, jobject object) {
+  URLRequestPeer* request = GetNativeObject(env, object);
+  if (request == NULL) {
+    return NULL;
+  }
+  std::string type = request->content_type();
+  if (!type.empty()) {
+    return env->NewStringUTF(type.c_str());
+  } else {
+    return NULL;
+  }
+}
+
+JNIEXPORT jlong JNICALL
+Java_org_chromium_net_UrlRequest_nativeGetContentLength(
+    JNIEnv* env, jobject object) {
+  URLRequestPeer* request = GetNativeObject(env, object);
+  if (request == NULL) {
+    return 0;
+  }
+  return request->content_length();
+}