Add FakeBackingStore::co_getBlobAuxData

Summary: Add coroutine (now_task) version of getBlobAuxData for `getBlake3` migration.

Reviewed By: SBones

Differential Revision: D102858780

fbshipit-source-id: 3e9177da8dd515d26f1e1121931b7dd0b1446547

Author: janezhang10

eden/fs/testharness/FakeBackingStore.cpp

@@ -248,6 +248,33 @@ FakeBackingStore::getBlobAuxData(
       .semi();
 }
 
+folly::coro::now_task<BackingStore::GetBlobAuxResult>
+FakeBackingStore::co_getBlobAuxData(
+    const ObjectId& id,
+    const ObjectFetchContextPtr& context) {
+  {
+    auto data = data_.wlock();
+    data->auxDataLookups.push_back(id);
+  }
+
+  if (serverState_) {
+    co_await serverState_->getFaultInjector().co_checkAsync(
+        "getBlobAuxData", id);
+  }
+
+  auto blobResult = co_await co_getBlob(id, context);
+  co_return BackingStore::GetBlobAuxResult{
+      std::make_shared<BlobAuxDataPtr::element_type>(
+          Hash20::sha1(blobResult.blob->getContents()),
+          blake3Key_ ? Hash32::keyedBlake3(
+                           folly::ByteRange{folly::StringPiece{
+                               blake3Key_->data(), blake3Key_->size()}},
+                           blobResult.blob->getContents())
+                     : Hash32::blake3(blobResult.blob->getContents()),
+          blobResult.blob->getSize()),
+      blobResult.origin};
+}
+
 ImmediateFuture<BackingStore::GetGlobFilesResult>
 FakeBackingStore::getGlobFiles(
     const RootId& id,

eden/fs/testharness/FakeBackingStore.h

@@ -251,6 +251,9 @@ class FakeBackingStore final : public BackingStore {
   folly::SemiFuture<GetBlobAuxResult> getBlobAuxData(
       const ObjectId& id,
       const ObjectFetchContextPtr& context) override;
+  folly::coro::now_task<GetBlobAuxResult> co_getBlobAuxData(
+      const ObjectId& id,
+      const ObjectFetchContextPtr& context);
   ImmediateFuture<GetGlobFilesResult> getGlobFiles(
       const RootId& id,
       const std::vector<std::string>& globs,