[Offline Prefetech] Send GetOperationReqest to the server

components/offline_pages/core/prefetch/get_operation_request.cc

+// Copyright 2017 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 "components/offline_pages/core/prefetch/get_operation_request.h"
+
+#include "base/bind.h"
+#include "base/location.h"
+#include "base/logging.h"
+#include "components/offline_pages/core/prefetch/prefetch_proto_utils.h"
+#include "components/offline_pages/core/prefetch/prefetch_request_fetcher.h"
+#include "net/url_request/url_request_context_getter.h"
+#include "url/gurl.h"
+
+namespace offline_pages {
+
+namespace {
+const char kGetOperationURLPath[] = "v1/operations/";
+}  // namespace
+
+GetOperationRequest::GetOperationRequest(
+    const std::string& name,
+    net::URLRequestContextGetter* request_context_getter,
+    const PrefetchRequestFinishedCallback& callback)
+    : callback_(callback) {
+  std::string path(kGetOperationURLPath);
+  path += name;
+  fetcher_ = PrefetchRequestFetcher::CreateForGet(
+      path, request_context_getter,
+      base::Bind(&GetOperationRequest::OnCompleted,
+                 // Fetcher is owned by this instance.
+                 base::Unretained(this)));
+}
+
+GetOperationRequest::~GetOperationRequest() {}
+
+void GetOperationRequest::OnCompleted(PrefetchRequestStatus status,
+                                      const std::string& data) {
+  if (status != PrefetchRequestStatus::SUCCESS) {
+    callback_.Run(status, std::vector<RenderPageInfo>());
+    return;
+  }
+
+  std::vector<RenderPageInfo> pages;
+  if (!ParseOperationResponse(data, &pages)) {
+    callback_.Run(PrefetchRequestStatus::SHOULD_RETRY_WITH_BACKOFF,
+                  std::vector<RenderPageInfo>());
+    return;
+  }
+
+  callback_.Run(PrefetchRequestStatus::SUCCESS, pages);
+}
+
+}  // offline_pages