[BlobAsync] Disk support for blob storage

content/browser/blob_storage/blob_dispatcher_host.cc

Index: content/browser/blob_storage/blob_dispatcher_host.cc
diff --git a/content/browser/blob_storage/blob_dispatcher_host.cc b/content/browser/blob_storage/blob_dispatcher_host.cc
index 2c43055a5ecf3c7b9ff45cb2269bbfb5910aed77..6c24a15425f9a2943bacd42b12f93b051987b3e1 100644
--- a/content/browser/blob_storage/blob_dispatcher_host.cc
+++ b/content/browser/blob_storage/blob_dispatcher_host.cc
@@ -12,8 +12,8 @@
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
 #include "content/common/fileapi/webblob_messages.h"
 #include "ipc/ipc_platform_file.h"
+#include "storage/browser/blob/blob_data_handle.h"
 #include "storage/browser/blob/blob_storage_context.h"
-#include "storage/browser/blob/blob_transport_result.h"
 #include "storage/common/blob_storage/blob_item_bytes_request.h"
 #include "storage/common/blob_storage/blob_item_bytes_response.h"
 #include "storage/common/data_element.h"
@@ -21,8 +21,7 @@
 
 using storage::BlobStorageContext;
 using storage::BlobStorageRegistry;
-using storage::BlobTransportResult;
-using storage::IPCBlobCreationCancelCode;
+using storage::BlobStatus;
 
 namespace content {
 namespace {
@@ -54,10 +53,9 @@ void BlobDispatcherHost::OnChannelClosing() {
 bool BlobDispatcherHost::OnMessageReceived(const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(BlobDispatcherHost, message)
-    IPC_MESSAGE_HANDLER(BlobStorageMsg_RegisterBlobUUID, OnRegisterBlobUUID)
-    IPC_MESSAGE_HANDLER(BlobStorageMsg_StartBuildingBlob, OnStartBuildingBlob)
+    IPC_MESSAGE_HANDLER(BlobStorageMsg_RegisterBlob, OnRegisterBlob)
     IPC_MESSAGE_HANDLER(BlobStorageMsg_MemoryItemResponse, OnMemoryItemResponse)
-    IPC_MESSAGE_HANDLER(BlobStorageMsg_CancelBuildingBlob, OnCancelBuildingBlob)
+    IPC_MESSAGE_HANDLER(BlobStorageMsg_SendBlobStatus, OnCancelBuildingBob)
     IPC_MESSAGE_HANDLER(BlobHostMsg_IncrementRefCount, OnIncrementBlobRefCount)
     IPC_MESSAGE_HANDLER(BlobHostMsg_DecrementRefCount, OnDecrementBlobRefCount)
     IPC_MESSAGE_HANDLER(BlobHostMsg_RegisterPublicURL, OnRegisterPublicBlobURL)
@@ -67,11 +65,11 @@ bool BlobDispatcherHost::OnMessageReceived(const IPC::Message& message) {
   return handled;
 }
 
-void BlobDispatcherHost::OnRegisterBlobUUID(
+void BlobDispatcherHost::OnRegisterBlob(
     const std::string& uuid,
     const std::string& content_type,
     const std::string& content_disposition,
-    const std::set<std::string>& referenced_blob_uuids) {
+    const std::vector<storage::DataElement>& descriptions) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   BlobStorageContext* context = this->context();
   if (uuid.empty() || context->registry().HasEntry(uuid) ||
@@ -80,68 +78,13 @@ void BlobDispatcherHost::OnRegisterBlobUUID(
     return;
   }
   blobs_inuse_map_[uuid] = 1;
-  BlobTransportResult result = async_builder_.RegisterBlobUUID(
-      uuid, content_type, content_disposition, referenced_blob_uuids, context);
-  switch (result) {
-    case BlobTransportResult::BAD_IPC:
-      blobs_inuse_map_.erase(uuid);
-      bad_message::ReceivedBadMessage(this,
-                                      bad_message::BDH_CONSTRUCTION_FAILED);
-      break;
-    case BlobTransportResult::CANCEL_REFERENCED_BLOB_BROKEN:
-      // The async builder builds the blob as broken, and we just need to send
-      // the cancel message back to the renderer.
-      Send(new BlobStorageMsg_CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::REFERENCED_BLOB_BROKEN));
-      break;
-    case BlobTransportResult::DONE:
-      break;
-    case BlobTransportResult::CANCEL_MEMORY_FULL:
-    case BlobTransportResult::CANCEL_FILE_ERROR:
-    case BlobTransportResult::CANCEL_UNKNOWN:
-    case BlobTransportResult::PENDING_RESPONSES:
-      NOTREACHED();
-      break;
-  }
-}
-
-void BlobDispatcherHost::OnStartBuildingBlob(
-    const std::string& uuid,
-    const std::vector<storage::DataElement>& descriptions) {
-  DCHECK_CURRENTLY_ON(BrowserThread::IO);
-  if (uuid.empty()) {
-    SendIPCResponse(uuid, BlobTransportResult::BAD_IPC);
-    return;
-  }
-  BlobStorageContext* context = this->context();
-  const BlobStorageRegistry::Entry* entry = context->registry().GetEntry(uuid);
-  if (!entry || entry->state == BlobStorageRegistry::BlobState::BROKEN) {
-    // We ignore messages for blobs that don't exist to handle the case where
-    // the renderer de-refs a blob that we're still constructing, and there are
-    // no references to that blob. We ignore broken as well, in the case where
-    // we decided to break a blob after RegisterBlobUUID is called.
-    // Second, if the last dereference of the blob happened on a different host,
-    // then we still haven't gotten rid of the 'building' state in the original
-    // host. So we call cancel, and send the message just in case that happens.
-    if (async_builder_.IsBeingBuilt(uuid)) {
-      async_builder_.CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::BLOB_DEREFERENCED_WHILE_BUILDING,
-          context);
-      Send(new BlobStorageMsg_CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::BLOB_DEREFERENCED_WHILE_BUILDING));
-    }
-    return;
-  }
-  if (!async_builder_.IsBeingBuilt(uuid)) {
-    SendIPCResponse(uuid, BlobTransportResult::BAD_IPC);
-    return;
-  }
-  // |this| owns async_builder_ so using base::Unretained(this) is safe.
-  BlobTransportResult result = async_builder_.StartBuildingBlob(
-      uuid, descriptions, context->memory_available(), context,
+  BlobStatus result = async_builder_.RegisterBlob(
+      uuid, content_type, content_disposition, descriptions, context,
       base::Bind(&BlobDispatcherHost::SendMemoryRequest, base::Unretained(this),
-                 uuid));
-  SendIPCResponse(uuid, result);
+                 uuid),
+      base::Bind(&BlobDispatcherHost::MaybeSendFinalBlobStatus,
+                 base::Unretained(this), uuid));
+  MaybeSendFinalBlobStatus(uuid, result);
 }
 
 void BlobDispatcherHost::OnMemoryItemResponse(
@@ -149,12 +92,12 @@ void BlobDispatcherHost::OnMemoryItemResponse(
     const std::vector<storage::BlobItemBytesResponse>& responses) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   if (uuid.empty()) {
-    SendIPCResponse(uuid, BlobTransportResult::BAD_IPC);
+    bad_message::ReceivedBadMessage(this, bad_message::BDH_CONSTRUCTION_FAILED);
     return;
   }
   BlobStorageContext* context = this->context();
   const BlobStorageRegistry::Entry* entry = context->registry().GetEntry(uuid);
-  if (!entry || entry->state == BlobStorageRegistry::BlobState::BROKEN) {
+  if (!entry || BlobStatusIsError(entry->status)) {
     // We ignore messages for blobs that don't exist to handle the case where
     // the renderer de-refs a blob that we're still constructing, and there are
     // no references to that blob. We ignore broken as well, in the case where
@@ -165,33 +108,31 @@ void BlobDispatcherHost::OnMemoryItemResponse(
     // host. So we call cancel, and send the message just in case that happens.
     if (async_builder_.IsBeingBuilt(uuid)) {
       async_builder_.CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::BLOB_DEREFERENCED_WHILE_BUILDING,
-          context);
-      Send(new BlobStorageMsg_CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::BLOB_DEREFERENCED_WHILE_BUILDING));
+          uuid, BlobStatus::BLOB_DEREFERENCED_WHILE_BUILDING, context);
+      MaybeSendFinalBlobStatus(uuid,
+                               BlobStatus::BLOB_DEREFERENCED_WHILE_BUILDING);
     }
     return;
   }
   if (!async_builder_.IsBeingBuilt(uuid)) {
-    SendIPCResponse(uuid, BlobTransportResult::BAD_IPC);
+    bad_message::ReceivedBadMessage(this, bad_message::BDH_CONSTRUCTION_FAILED);
     return;
   }
-  BlobTransportResult result =
+  BlobStatus result =
       async_builder_.OnMemoryResponses(uuid, responses, context);
-  SendIPCResponse(uuid, result);
+  MaybeSendFinalBlobStatus(uuid, result);
 }
 
-void BlobDispatcherHost::OnCancelBuildingBlob(
-    const std::string& uuid,
-    const storage::IPCBlobCreationCancelCode code) {
+void BlobDispatcherHost::OnCancelBuildingBob(const std::string& uuid,
+                                             const storage::BlobStatus code) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   if (uuid.empty()) {
-    SendIPCResponse(uuid, BlobTransportResult::BAD_IPC);
+    bad_message::ReceivedBadMessage(this, bad_message::BDH_CONSTRUCTION_FAILED);
     return;
   }
   BlobStorageContext* context = this->context();
   const BlobStorageRegistry::Entry* entry = context->registry().GetEntry(uuid);
-  if (!entry || entry->state == BlobStorageRegistry::BlobState::BROKEN) {
+  if (!entry || BlobStatusIsError(entry->status)) {
     // We ignore messages for blobs that don't exist to handle the case where
     // the renderer de-refs a blob that we're still constructing, and there are
     // no references to that blob. We ignore broken as well, in the case where
@@ -202,13 +143,13 @@ void BlobDispatcherHost::OnCancelBuildingBlob(
     // host. So we call cancel just in case this happens.
     if (async_builder_.IsBeingBuilt(uuid)) {
       async_builder_.CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::BLOB_DEREFERENCED_WHILE_BUILDING,
-          context);
+          uuid, BlobStatus::BLOB_DEREFERENCED_WHILE_BUILDING, context);
     }
     return;
   }
-  if (!async_builder_.IsBeingBuilt(uuid)) {
-    SendIPCResponse(uuid, BlobTransportResult::BAD_IPC);
+  // We should only get these messages for errors.
+  if (!async_builder_.IsBeingBuilt(uuid) || !storage::BlobStatusIsError(code)) {
+    bad_message::ReceivedBadMessage(this, bad_message::BDH_CONSTRUCTION_FAILED);
     return;
   }
   VLOG(1) << "Blob construction of " << uuid << " cancelled by renderer. "
@@ -256,10 +197,9 @@ void BlobDispatcherHost::OnDecrementBlobRefCount(const std::string& uuid) {
     if (async_builder_.IsBeingBuilt(uuid) &&
         !context->registry().HasEntry(uuid)) {
       async_builder_.CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::BLOB_DEREFERENCED_WHILE_BUILDING,
-          context);
-      Send(new BlobStorageMsg_CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::BLOB_DEREFERENCED_WHILE_BUILDING));
+          uuid, BlobStatus::BLOB_DEREFERENCED_WHILE_BUILDING, context);
+      MaybeSendFinalBlobStatus(uuid,
+                               BlobStatus::BLOB_DEREFERENCED_WHILE_BUILDING);
     }
   }
 }
@@ -309,42 +249,23 @@ void BlobDispatcherHost::SendMemoryRequest(
     std::unique_ptr<std::vector<base::File>> files) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   std::vector<IPC::PlatformFileForTransit> file_handles;
-  // TODO(dmurph): Support file-backed blob transportation.
-  DCHECK(files->empty());
+  for (base::File& file : *files) {
+    file_handles.push_back(IPC::TakePlatformFileForTransit(std::move(file)));
+  }
   Send(new BlobStorageMsg_RequestMemoryItem(uuid, *requests, *memory_handles,
                                             file_handles));
 }
 
-void BlobDispatcherHost::SendIPCResponse(const std::string& uuid,
-                                         storage::BlobTransportResult result) {
-  switch (result) {
-    case BlobTransportResult::BAD_IPC:
-      bad_message::ReceivedBadMessage(this,
-                                      bad_message::BDH_CONSTRUCTION_FAILED);
-      return;
-    case BlobTransportResult::CANCEL_MEMORY_FULL:
-      Send(new BlobStorageMsg_CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::OUT_OF_MEMORY));
-      return;
-    case BlobTransportResult::CANCEL_FILE_ERROR:
-      Send(new BlobStorageMsg_CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::FILE_WRITE_FAILED));
-      return;
-    case BlobTransportResult::CANCEL_REFERENCED_BLOB_BROKEN:
-      Send(new BlobStorageMsg_CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::REFERENCED_BLOB_BROKEN));
-      return;
-    case BlobTransportResult::CANCEL_UNKNOWN:
-      Send(new BlobStorageMsg_CancelBuildingBlob(
-          uuid, IPCBlobCreationCancelCode::UNKNOWN));
-      return;
-    case BlobTransportResult::PENDING_RESPONSES:
-      return;
-    case BlobTransportResult::DONE:
-      Send(new BlobStorageMsg_DoneBuildingBlob(uuid));
-      return;
+void BlobDispatcherHost::MaybeSendFinalBlobStatus(const std::string& uuid,
+                                                  BlobStatus status) {
+  if (storage::BlobStatusIsBadIPC(status)) {
+    blobs_inuse_map_.erase(uuid);
+    bad_message::ReceivedBadMessage(this, bad_message::BDH_CONSTRUCTION_FAILED);
+    return;
   }
-  NOTREACHED();
+  if (BlobStatusIsPending(status))
+    return;
+  Send(new BlobStorageMsg_SendBlobStatus(uuid, status));
 }
 
 bool BlobDispatcherHost::IsInUseInHost(const std::string& uuid) {