{"action":"created","comment":{"url":"https://api.github.com/repos/hyperledger/iroha/pulls/comments/209911965","pull_request_review_id":145949808,"id":209911965,"node_id":"MDI0OlB1bGxSZXF1ZXN0UmV2aWV3Q29tbWVudDIwOTkxMTk2NQ==","diff_hunk":"@@ -56,20 +57,23 @@ using Validator =\n \n rxcpp::observable<std::shared_ptr<Block>> BlockLoaderImpl::retrieveBlocks(\n     const PublicKey &peer_pubkey) {\n-  return rxcpp::observable<>::create<\n-      std::shared_ptr<Block>>([this, peer_pubkey](auto subscriber) {\n-    std::shared_ptr<Block> top_block;\n-    block_query_->getTopBlock().match(\n-        [&top_block](\n-            expected::Value<std::shared_ptr<shared_model::interface::Block>>\n-                block) { top_block = block.value; },\n-        [this](expected::Error<std::string> error) {\n-          log_->error(kTopBlockRetrieveFail + std::string{\": \"} + error.error);\n-        });\n-    if (not top_block) {\n-      subscriber.on_completed();\n-      return;\n-    }\n+  return rxcpp::observable<>::create<std::shared_ptr<Block>>(\n+      [this, peer_pubkey](auto subscriber) {\n+        std::shared_ptr<Block> top_block;\n+        block_query_factory_->createBlockQuery() |\n+        [this, &top_block](const auto &block_query) {\n+          block_query->getTopBlock().match(\n+            [&top_block](\n+                expected::Value<std::shared_ptr<shared_model::interface::Block>>\n+                    block) { top_block = block.value;\n+            },[this](expected::Error<std::string> error) {","path":"irohad/network/impl/block_loader_impl.cpp","position":45,"original_position":45,"commit_id":"d4460cd72d3fd5b1f0b0ae8254e5e506ae598ec9","original_commit_id":"d4460cd72d3fd5b1f0b0ae8254e5e506ae598ec9","user":{"login":"lebdron","id":14347159,"node_id":"MDQ6VXNlcjE0MzQ3MTU5","avatar_url":"https://avatars1.githubusercontent.com/u/14347159?v=4","gravatar_id":"","url":"https://api.github.com/users/lebdron","html_url":"https://github.com/lebdron","followers_url":"https://api.github.com/users/lebdron/followers","following_url":"https://api.github.com/users/lebdron/following{/other_user}","gists_url":"https://api.github.com/users/lebdron/gists{/gist_id}","starred_url":"https://api.github.com/users/lebdron/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/lebdron/subscriptions","organizations_url":"https://api.github.com/users/lebdron/orgs","repos_url":"https://api.github.com/users/lebdron/repos","events_url":"https://api.github.com/users/lebdron/events{/privacy}","received_events_url":"https://api.github.com/users/lebdron/received_events","type":"User","site_admin":false},"body":"Is this formatted? 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Just remove them or write None -->\r\n\r\n<!-- ### Requirements -->\r\n<!-- * Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion. -->\r\n<!-- * All new code must have code coverage above 70% (https://docs.codecov.io/docs/about-code-coverage). -->\r\n<!-- * CircleCI builds must be passed. -->\r\n<!-- * Critical and blocker issues reported by Sorabot must be fixed. -->\r\n<!-- * Branch must be rebased onto base branch (https://soramitsu.atlassian.net/wiki/spaces/IS/pages/11173889/Rebase+and+merge+guide). -->\r\n\r\n\r\n### Description of the Change\r\nPreviously, peer query and block query were passed to irohad components by value. Therefore they occupied connection for the whole lifetime of irohad. \r\nNow fabrics passed instead. It allows not to keep db connection and not to force postgres to kill connections.\r\n<!-- We must be able to understand the design of your change from this description. 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