Blimp: Add BlobChannelSender implementation

blimp/net/blob_channel/blob_channel_sender.cc

+// Copyright 2016 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 "blimp/net/blob_channel/blob_channel_sender.h"
+
+#include "base/strings/string_number_conversions.h"
+#include "blimp/common/blob_cache/blob_cache.h"
+
+namespace blimp {
+
+BlobChannelSender::BlobChannelSender(BlobCache* cache,
+                                     Delegate* delegate)
+    : cache_(cache), delegate_(delegate) {
+  DCHECK(cache_);
+  DCHECK(delegate_);
+}
+
+BlobChannelSender::~BlobChannelSender() {}
+
+void BlobChannelSender::Put(const BlobId& id, BlobData data) {
+  DCHECK(data.get());

[Wez, 2016/04/19 00:01:57]

nit: Just DCHECK(data)

Do you also want to DCHECK that |id| is non-empty?

[Kevin M, 2016/04/19 23:39:23]

Done.

+
+  if (cache_->Contains(id)) {
+    return;
+  }
+
+  VLOG(2) << "Put blob: " << base::HexEncode(id.data(), id.size());
+  cache_->Put(id, data);
+}
+
+void BlobChannelSender::Deliver(const BlobId& id) {
+  if (!cache_->Contains(id)) {
+    DLOG(FATAL) << "Attempted to push invalid blob ID: "
+                << base::HexEncode(id.data(), id.size());
+    return;
+  }
+  if (receiver_cache_contents_.find(id) != receiver_cache_contents_.end()) {
+    DVLOG(3) << "Suppressed redundant push: "
+             << base::HexEncode(id.data(), id.size());
+    return;
+  }
+
+  VLOG(2) << "Deliver blob: " << base::HexEncode(id.data(), id.size());
+  delegate_->Deliver(id, cache_->Get(id));
+  receiver_cache_contents_.insert(id);
+}
+
+}  // namespace blimp