Add support for log-handler

This handler is based off of version handler with major differences in
handler_builder

Tested:
created the blackbox blob successfully using this lib.
Read the data from the blob using a host side tool

Signed-off-by: Gaurav Gandhi <gauravgandhi@google.com>
Change-Id: I9ef775af752156a1647453ff3831ef4c0449d546
diff --git a/bmc/log-handler/test/log_read_unittest.cpp b/bmc/log-handler/test/log_read_unittest.cpp
new file mode 100644
index 0000000..ab952e6
--- /dev/null
+++ b/bmc/log-handler/test/log_read_unittest.cpp
@@ -0,0 +1,153 @@
+// Copyright 2021 Google Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "log_handler.hpp"
+#include "log_mock.hpp"
+
+#include <memory>
+#include <string>
+#include <string_view>
+#include <vector>
+
+#include <gtest/gtest.h>
+
+using ::testing::_;
+using ::testing::DoAll;
+using ::testing::ElementsAreArray;
+using ::testing::Ge;
+using ::testing::IsEmpty;
+using ::testing::Return;
+
+namespace ipmi_flash
+{
+
+class LogReadBlobTest : public ::testing::Test
+{
+  protected:
+    void SetUp() override
+    {
+        h = std::make_unique<LogBlobHandler>(
+            createMockLogConfigs(blobNames, &im, &tm));
+    }
+    std::unique_ptr<blobs::GenericBlobInterface> h;
+    std::vector<std::string> blobNames{"blob0", "blob1", "blob2", "blob3"};
+    std::unordered_map<std::string, TriggerMock*> tm;
+    std::unordered_map<std::string, ImageHandlerMock*> im;
+    const std::uint16_t defaultSessionNumber{200};
+    std::vector<uint8_t> vector1{0xDE, 0xAD, 0xBE, 0xEF,
+                                 0xBA, 0xDF, 0xEE, 0x0D};
+    std::vector<uint8_t> vector2{0xCE, 0xAD, 0xDE, 0xFF};
+};
+
+TEST_F(LogReadBlobTest, VerifyValidRead)
+{
+    testing::InSequence seq;
+    EXPECT_CALL(*tm.at("blob0"), trigger())
+        .WillOnce(DoAll([&]() { tm.at("blob0")->cb(*tm.at("blob0")); },
+                        Return(true)));
+    EXPECT_CALL(*tm.at("blob0"), status())
+        .WillOnce(Return(ActionStatus::success));
+    EXPECT_CALL(*im.at("blob0"), open(_, std::ios::in)).WillOnce(Return(true));
+    EXPECT_CALL(*im.at("blob0"), read(0, Ge(vector1.size())))
+        .WillOnce(Return(vector1));
+    EXPECT_CALL(*im.at("blob0"), close()).Times(1);
+    EXPECT_TRUE(h->open(defaultSessionNumber, blobs::read, "blob0"));
+
+    std::basic_string_view<uint8_t> vectorS(vector1.data(), vector1.size());
+    EXPECT_THAT(h->read(defaultSessionNumber, 0, 7),
+                ElementsAreArray(vectorS.substr(0, 7)));
+    EXPECT_THAT(h->read(defaultSessionNumber, 2, 10),
+                ElementsAreArray(vectorS.substr(2, 6)));
+    EXPECT_THAT(h->read(defaultSessionNumber, 10, 0), IsEmpty());
+}
+
+TEST_F(LogReadBlobTest, VerifyMultipleSession)
+{
+    testing::InSequence seq;
+    EXPECT_CALL(*tm.at("blob0"), trigger()).WillOnce(Return(true));
+    EXPECT_TRUE(h->open(0, blobs::read, "blob0"));
+    EXPECT_TRUE(h->open(1, blobs::read, "blob0"));
+
+    EXPECT_CALL(*tm.at("blob0"), status())
+        .WillOnce(Return(ActionStatus::success));
+    EXPECT_CALL(*im.at("blob0"), open(_, std::ios::in)).WillOnce(Return(true));
+    EXPECT_CALL(*im.at("blob0"), read(0, Ge(vector1.size())))
+        .WillOnce(Return(vector1));
+    EXPECT_CALL(*im.at("blob0"), close()).Times(1);
+    tm.at("blob0")->cb(*tm.at("blob0"));
+
+    EXPECT_CALL(*tm.at("blob0"), trigger()).WillOnce(Return(true));
+    EXPECT_TRUE(h->open(2, blobs::read, "blob0"));
+
+    EXPECT_CALL(*tm.at("blob0"), status())
+        .WillOnce(Return(ActionStatus::success));
+    EXPECT_CALL(*im.at("blob0"), open(_, std::ios::in)).WillOnce(Return(true));
+    EXPECT_CALL(*im.at("blob0"), read(0, Ge(vector2.size())))
+        .WillOnce(Return(vector2));
+    EXPECT_CALL(*im.at("blob0"), close()).Times(1);
+    tm.at("blob0")->cb(*tm.at("blob0"));
+
+    EXPECT_THAT(h->read(0, 0, 10), ElementsAreArray(vector1));
+    EXPECT_THAT(h->read(1, 0, 10), ElementsAreArray(vector1));
+    EXPECT_THAT(h->read(2, 0, 10), ElementsAreArray(vector2));
+}
+
+TEST_F(LogReadBlobTest, VerifyReadEarlyFails)
+{
+    EXPECT_CALL(*tm.at("blob0"), trigger()).WillOnce(Return(true));
+
+    EXPECT_TRUE(h->open(defaultSessionNumber, blobs::read, "blob0"));
+    EXPECT_THROW(h->read(defaultSessionNumber, 0, 10), std::runtime_error);
+}
+
+TEST_F(LogReadBlobTest, VerifyTriggerFailureReadFails)
+{
+    EXPECT_CALL(*tm.at("blob0"), trigger())
+        .WillOnce(DoAll([&]() { tm.at("blob0")->cb(*tm.at("blob0")); },
+                        Return(true)));
+    EXPECT_CALL(*tm.at("blob0"), status())
+        .WillOnce(Return(ActionStatus::failed));
+    EXPECT_TRUE(h->open(defaultSessionNumber, blobs::read, "blob0"));
+    EXPECT_THROW(h->read(defaultSessionNumber, 0, 10), std::runtime_error);
+}
+
+TEST_F(LogReadBlobTest, VerifyReadFailsOnFileOpenFailure)
+{
+    EXPECT_CALL(*tm.at("blob0"), trigger())
+        .WillOnce(DoAll([&]() { tm.at("blob0")->cb(*tm.at("blob0")); },
+                        Return(true)));
+    EXPECT_CALL(*tm.at("blob0"), status())
+        .WillOnce(Return(ActionStatus::success));
+    EXPECT_CALL(*im.at("blob0"), open(_, std::ios::in)).WillOnce(Return(false));
+
+    EXPECT_TRUE(h->open(defaultSessionNumber, blobs::read, "blob0"));
+    EXPECT_THROW(h->read(defaultSessionNumber, 0, 10), std::runtime_error);
+}
+
+TEST_F(LogReadBlobTest, VerifyReadFailsOnFileReadFailure)
+{
+    EXPECT_CALL(*tm.at("blob0"), trigger())
+        .WillOnce(DoAll([&]() { tm.at("blob0")->cb(*tm.at("blob0")); },
+                        Return(true)));
+    EXPECT_CALL(*tm.at("blob0"), status())
+        .WillOnce(Return(ActionStatus::success));
+    EXPECT_CALL(*im.at("blob0"), open(_, std::ios::in)).WillOnce(Return(true));
+    EXPECT_CALL(*im.at("blob0"), read(_, _)).WillOnce(Return(std::nullopt));
+    EXPECT_CALL(*im.at("blob0"), close()).Times(1);
+
+    EXPECT_TRUE(h->open(defaultSessionNumber, blobs::read, "blob0"));
+    EXPECT_THROW(h->read(defaultSessionNumber, 0, 10), std::runtime_error);
+}
+
+} // namespace ipmi_flash