Retrieved Hostlist information from Directory service.

remoting/test/chromoting_host_list_fetcher.cc

+// Copyright 2015 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 "remoting/test/chromoting_host_list_fetcher.h"
+
+#include "base/bind.h"
+#include "base/callback_helpers.h"
+#include "base/json/json_reader.h"
+#include "base/logging.h"
+#include "base/thread_task_runner_handle.h"
+#include "base/values.h"
+#include "net/http/http_status_code.h"
+#include "net/url_request/url_fetcher.h"
+#include "remoting/base/url_request_context_getter.h"
+
+namespace remoting {
+namespace test {
+
+ChromotingHostListFetcher::ChromotingHostListFetcher() {
+}
+
+ChromotingHostListFetcher::~ChromotingHostListFetcher() {
+}
+
+void ChromotingHostListFetcher::RetrieveHostlist(
+    const std::string& access_token,
+    const HostlistCallback& callback) {
+
+  DVLOG(2) << "ChromotingHostListFetcher::RetrieveHostlist() called";
+
+  DCHECK(!access_token.empty());
+  DCHECK(!callback.is_null());
+  DCHECK(hostlist_callback_.is_null());
+
+  hostlist_callback_ = callback;
+
+  request_context_getter_ = new remoting::URLRequestContextGetter(
+      base::ThreadTaskRunnerHandle::Get(),   // network_runner
+      base::ThreadTaskRunnerHandle::Get());  // file_runner
+
+  request_ = net::URLFetcher::Create(
+      GURL(kChromotingHostListProdRequestUrl), net::URLFetcher::GET, this);
+  request_->SetRequestContext(request_context_getter_.get());
+  request_->AddExtraRequestHeader("Authorization: OAuth " + access_token);
+  request_->Start();
+}
+
+bool ChromotingHostListFetcher::ProcessResponse(
+    std::vector<ChromotingHostInfo>* hostlist) {
+  int response_code = request_->GetResponseCode();
+  if (response_code != net::HTTP_OK) {
+    LOG(ERROR) << "Hostlist request failed with error code: " << response_code;
+    return false;
+  }
+
+  std::string response_string;
+  if (!request_->GetResponseAsString(&response_string)) {
+    LOG(ERROR) << "Failed to retrieve Hostlist response data";
+    return false;
+  }
+
+  scoped_ptr<base::Value> response_value(
+      base::JSONReader::Read(response_string));
+  if (!response_value ||
+      !response_value->IsType(base::Value::TYPE_DICTIONARY)) {
+    LOG(ERROR) << "Failed to parse response string to JSON";
+    return false;
+  }
+
+  const base::DictionaryValue* response;
+  if (!response_value->GetAsDictionary(&response)) {
+    LOG(ERROR) << "Failed to convert parsed JSON to a dictionary object";
+    return false;
+  }
+
+  const base::DictionaryValue* data = nullptr;
+  if (!response->GetDictionary("data", &data)) {
+    LOG(ERROR) << "Hostlist response data is empty";
+    return false;
+  }
+
+  const base::ListValue* hosts = nullptr;
+  if (!data->GetList("items", &hosts)) {
+    LOG(ERROR) << "Failed to find hosts in Hostlist response data";
+    return false;
+  }
+
+  // TODO(TonyChun): host_info that does not have all information (host_name,
+  // host_id, jabber_id, host_offline_reason, host_status, public key) will not
+  // be added to the hostlist.

[joedow, 2015/07/08 17:19:07]

Why is this a TODO?  It seems like documentation vs. a comment about changes
that need to be made in the future.

[tonychun, 2015/07/08 22:38:15]

That was a mistake. Changed it.

+  for (base::Value* host_info : *hosts) {
+    ChromotingHostInfo chromoting_host_info;
+    if (chromoting_host_info.ParseHostInfo(
+        *reinterpret_cast<base::DictionaryValue*>(host_info))) {

[joedow, 2015/07/08 17:19:07]

Instead of using a reinterpret cast here, can you use
host_info->GetAsDictionary(&host_dict) here?

[tonychun, 2015/07/08 22:38:15]

Done.

+      hostlist->push_back(chromoting_host_info);
+    }
+  }
+  return true;
+}
+
+void ChromotingHostListFetcher::OnURLFetchComplete(
+    const net::URLFetcher* source) {
+  DCHECK(source);
+  DVLOG(2) << "URL Fetch Completed for: " << source->GetOriginalURL();
+
+  std::vector<ChromotingHostInfo> hostlist;
+
+  // Any malformed data from the Directory will notify the callback that
+  // processing the response failed.
+  if (!ProcessResponse(&hostlist)) {
+    hostlist.clear();
+    base::ResetAndReturn(&hostlist_callback_).Run(hostlist, false);
+    return;

[joedow, 2015/07/08 17:19:07]

nit: I think it is better to have a single return statement (if possible).  Why
not just set a response_processed bool if processing failed (and clear the
hostlist) then have a single ResetAndReturn call at the bottom here?

[tonychun, 2015/07/08 22:38:15]

Good thinking.

+  }
+  base::ResetAndReturn(&hostlist_callback_).Run(hostlist, true);
+}
+
+}  // namespace test
+}  // namespace remoting