Hide calls to Incredis in the Storage class.

This should allow me to write some decent
simulation tests.

src/tawashi/CMakeLists.txt

@@ -32,6 +32,7 @@ add_library(${PROJECT_NAME} STATIC
 	quick_submit_paste_response.cpp
 	ip_utils.cpp
 	mime_split.cpp
+	storage.cpp
 )
 
 target_include_directories(${PROJECT_NAME}

src/tawashi/pastie_response.cpp

@@ -16,7 +16,7 @@
  */
 
 #include "pastie_response.hpp"
-#include "incredis/incredis.hpp"
+#include "storage.hpp"
 #include "settings_bag.hpp"
 #include "escapist.hpp"
 #include "cgi_env.hpp"
@@ -75,13 +75,8 @@ namespace tawashi {
 	}
 
 	void PastieResponse::on_mustache_prepare (mstch::map& parContext) {
-		using opt_string = redis::IncRedis::opt_string;
-		using opt_string_list = redis::IncRedis::opt_string_list;
-
 		boost::string_ref token = cgi_env().request_uri_relative();
-		auto& redis = this->redis();
-		opt_string_list pastie_reply = redis.hmget(token, "pastie");
-		opt_string pastie = (pastie_reply and not pastie_reply->empty() ? (*pastie_reply)[0] : opt_string());
+		boost::optional<std::string> pastie = this->storage().retrieve_pastie(token);
 
 		if (not pastie) {
 			m_pastie_not_found = true;

src/tawashi/response.cpp

@@ -16,7 +16,6 @@
  */
 
 #include "response.hpp"
-#include "incredis/incredis.hpp"
 #include "settings_bag.hpp"
 #include "tawashi_config.h"
 #include "duckhandy/stringize.h"
@@ -62,23 +61,6 @@ namespace tawashi {
 			}
 		}
 
-		redis::IncRedis make_incredis (const tawashi::SettingsBag& parSettings) {
-			using redis::IncRedis;
-
-			if (parSettings["redis_mode"] == "inet") {
-				return IncRedis(
-					parSettings.as<std::string>("redis_server"),
-					parSettings.as<uint16_t>("redis_port")
-				);
-			}
-			else if (parSettings["redis_mode"] == "sock") {
-				return IncRedis(parSettings.as<std::string>("redis_sock"));
-			}
-			else {
-				throw std::runtime_error("Unknown setting for \"redis_mode\", valid settings are \"inet\" or \"sock\"");
-			}
-		}
-
 		boost::optional<std::string> load_whole_file (const std::string& parWebsiteRoot, const char* parSuffix, const boost::string_ref& parName, bool parThrow) {
 			std::ostringstream oss;
 			oss << parWebsiteRoot << parName << parSuffix;
@@ -152,6 +134,7 @@ namespace tawashi {
 		const Kakoune::SafePtr<cgi::Env>& parCgiEnv,
 		bool parWantRedis
 	) :
+		m_storage(parSettings),
 		//m_page_basename(fetch_page_basename(m_cgi_env)),
 		m_cgi_env(parCgiEnv),
 		m_settings(parSettings),
@@ -163,8 +146,7 @@ namespace tawashi {
 		assert(m_stream_out);
 
 		if (parWantRedis) {
-			m_redis = std::make_unique<redis::IncRedis>(make_incredis(*parSettings));
-			m_redis->connect();
+			m_storage.connect_async();
 		}
 
 		mstch::config::escape = &disable_mstch_escaping;
@@ -200,14 +182,7 @@ namespace tawashi {
 			{"languages", make_mstch_langmap(*m_settings)}
 		};
 
-		if (m_redis) {
-			SPDLOG_TRACE(statuslog, "Finalizing redis connection");
-			m_redis->wait_for_connect();
-			auto batch = m_redis->make_batch();
-			batch.select(m_settings->as<uint32_t>("redis_db"));
-			batch.client_setname("tawashi_v" STRINGIZE(VERSION_MAJOR) "." STRINGIZE(VERSION_MINOR) "." STRINGIZE(VERSION_PATCH));
-			batch.throw_if_failed();
-		}
+		m_storage.finalize_connection();
 
 		SPDLOG_TRACE(statuslog, "Raising event on_process");
 		HttpHeader http_header = this->on_process();
@@ -252,9 +227,9 @@ namespace tawashi {
 		return *content;
 	}
 
-	redis::IncRedis& Response::redis() const {
-		assert(m_redis);
-		return *m_redis;
+	const Storage& Response::storage() const {
+		assert(m_storage.is_connected());
+		return m_storage;
 	}
 
 	const SettingsBag& Response::settings() const {

src/tawashi/response.hpp

@@ -21,15 +21,12 @@
 #include "kakoune/safe_ptr.hh"
 #include "http_header.hpp"
 #include "error_reasons.hpp"
+#include "storage.hpp"
 #include <string>
 #include <iostream>
 #include <boost/utility/string_ref.hpp>
 #include <memory>
 
-namespace redis {
-	class IncRedis;
-} //namespace redis
-
 namespace tawashi {
 	class SettingsBag;
 
@@ -54,7 +51,7 @@ namespace tawashi {
 		const cgi::Env& cgi_env() const;
 		const std::string& base_uri() const;
 		virtual boost::string_ref page_basename() const = 0;
-		redis::IncRedis& redis() const;
+		const Storage& storage() const;
 		const SettingsBag& settings() const;
 		virtual std::string load_mustache() const;
 		HttpHeader make_redirect (HttpStatusCodes parCode, const std::string& parLocation);
@@ -65,11 +62,11 @@ namespace tawashi {
 		virtual void on_mustache_prepare (mstch::map& parContext);
 		virtual std::string on_mustache_retrieve();
 
+		Storage m_storage;
 		Kakoune::SafePtr<cgi::Env> m_cgi_env;
 		Kakoune::SafePtr<SettingsBag> m_settings;
 		std::string m_website_root;
 		std::string m_base_uri;
-		std::unique_ptr<redis::IncRedis> m_redis;
 		std::ostream* m_stream_out;
 	};
 } //namespace tawashi

src/tawashi/storage.cpp

@@ -0,0 +1,131 @@
+/* Copyright 2017, Michele Santullo
+ * This file is part of "tawashi".
+ *
+ * "tawashi" is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * "tawashi" is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with "tawashi".  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "storage.hpp"
+#include "settings_bag.hpp"
+#include "incredis/incredis.hpp"
+#include "num_to_token.hpp"
+#include "tawashi_config.h"
+#include "duckhandy/stringize.h"
+#include <cassert>
+#include <ciso646>
+#include <string>
+#include <spdlog/spdlog.h>
+#include <utility>
+
+namespace tawashi {
+	namespace {
+		redis::IncRedis make_incredis (const SettingsBag& parSettings) {
+			using redis::IncRedis;
+
+			if (parSettings["redis_mode"] == "inet") {
+				return IncRedis(
+					parSettings.as<std::string>("redis_server"),
+					parSettings.as<uint16_t>("redis_port")
+				);
+			}
+			else if (parSettings["redis_mode"] == "sock") {
+				return IncRedis(parSettings.as<std::string>("redis_sock"));
+			}
+			else {
+				throw std::runtime_error("Unknown setting for \"redis_mode\", valid settings are \"inet\" or \"sock\"");
+			}
+		}
+
+		Storage::SubmissionResult make_submission_result (std::string&& parToken) {
+			return Storage::SubmissionResult { std::move(parToken), boost::optional<ErrorReasons>() };
+		}
+
+		Storage::SubmissionResult make_submission_result (ErrorReasons parError) {
+			return Storage::SubmissionResult { std::string(), boost::make_optional(parError) };
+		}
+	} //unnamed namespace
+
+	Storage::Storage (const Kakoune::SafePtr<SettingsBag>& parSettings) :
+		m_redis(nullptr),
+		m_settings(parSettings)
+	{
+	}
+
+	Storage::~Storage() = default;
+
+	void Storage::connect_async() {
+		using redis::IncRedis;
+
+		assert(not m_redis);
+		m_redis = std::make_unique<redis::IncRedis>(make_incredis(*m_settings));
+		m_redis->connect();
+	}
+
+	bool Storage::is_connected() const {
+		return m_redis and m_redis->is_connected();
+	}
+
+	void Storage::finalize_connection() {
+		if (m_redis) {
+			SPDLOG_TRACE(spdlog::get("statuslog"), "Finalizing redis connection");
+			m_redis->wait_for_connect();
+			auto batch = m_redis->make_batch();
+			batch.select(m_settings->as<uint32_t>("redis_db"));
+			batch.client_setname("tawashi_v" STRINGIZE(VERSION_MAJOR) "." STRINGIZE(VERSION_MINOR) "." STRINGIZE(VERSION_PATCH));
+			batch.throw_if_failed();
+		}
+	}
+
+	Storage::SubmissionResult Storage::submit_pastie (
+		const boost::string_ref& parText,
+		uint32_t parExpiry,
+		const boost::string_ref& parLang,
+		const std::string& parRemoteIP
+	) const {
+		if (not is_connected())
+			return make_submission_result(ErrorReasons::RedisDisconnected);
+
+		assert(m_redis);
+		auto& redis = *m_redis;
+		if (redis.get(parRemoteIP)) {
+			//please wait and submit again
+			return make_submission_result(ErrorReasons::UserFlooding);
+		}
+
+		const auto next_id = redis.incr("paste_counter");
+		std::string token = num_to_token(next_id);
+		assert(not token.empty());
+		if (redis.hmset(token,
+			"pastie", parText,
+			"max_ttl", dhandy::lexical_cast<std::string>(parExpiry),
+			"lang", parLang)
+		) {
+			redis.set(parRemoteIP, "");
+			redis.expire(parRemoteIP, m_settings->as<uint32_t>("resubmit_wait"));
+			if (redis.expire(token, parExpiry))
+				return make_submission_result(std::move(token));
+		}
+
+		return make_submission_result(ErrorReasons::PastieNotSaved);
+	}
+
+	boost::optional<std::string> Storage::retrieve_pastie (const boost::string_ref& parToken) const {
+		using opt_string = redis::IncRedis::opt_string;
+		using opt_string_list = redis::IncRedis::opt_string_list;
+
+		opt_string_list pastie_reply = m_redis->hmget(parToken, "pastie");
+		opt_string pastie = (pastie_reply and not pastie_reply->empty() ? (*pastie_reply)[0] : opt_string());
+
+		return pastie;
+	}
+} //namespace tawashi

src/tawashi/storage.hpp

@@ -0,0 +1,61 @@
+/* Copyright 2017, Michele Santullo
+ * This file is part of "tawashi".
+ *
+ * "tawashi" is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * "tawashi" is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with "tawashi".  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "kakoune/safe_ptr.hh"
+#include "error_reasons.hpp"
+#include <memory>
+#include <cstdint>
+#include <boost/utility/string_ref.hpp>
+#include <boost/optional.hpp>
+#include <string>
+
+namespace redis {
+	class IncRedis;
+} //namespace redis
+
+namespace tawashi {
+	class SettingsBag;
+
+	class Storage {
+	public:
+		struct SubmissionResult {
+			std::string token;
+			boost::optional<ErrorReasons> error;
+		};
+
+		explicit Storage (const Kakoune::SafePtr<SettingsBag>& parSettings);
+		~Storage();
+
+		void connect_async();
+		bool is_connected() const;
+		void finalize_connection();
+		SubmissionResult submit_pastie (
+			const boost::string_ref& parText,
+			uint32_t parExpiry,
+			const boost::string_ref& parLang,
+			const std::string& parRemoteIP
+		) const;
+
+		boost::optional<std::string> retrieve_pastie (const boost::string_ref& parToken) const;
+
+	private:
+		std::unique_ptr<redis::IncRedis> m_redis;
+		Kakoune::SafePtr<SettingsBag> m_settings;
+	};
+} //namespace tawashi

src/tawashi/submit_paste_response.cpp

@@ -16,9 +16,8 @@
  */
 
 #include "submit_paste_response.hpp"
-#include "incredis/incredis.hpp"
+#include "storage.hpp"
 #include "cgi_post.hpp"
-#include "num_to_token.hpp"
 #include "settings_bag.hpp"
 #include "duckhandy/compatibility.h"
 #include "duckhandy/lexical_cast.hpp"
@@ -126,7 +125,7 @@ namespace tawashi {
 		//TODO: replace boost's lexical_cast with mine when I have some checks
 		//over invalid inputs
 		const uint32_t duration_int = std::max(std::min((duration.empty() ? 86400U : boost::lexical_cast<uint32_t>(duration)), 2628000U), 1U);
-		StringOrHeader submit_result = submit_to_redis(pastie, duration_int, lang);
+		StringOrHeader submit_result = submit_to_storage(pastie, duration_int, lang);
 		const auto& token = submit_result.first;
 
 		if (token) {
@@ -144,37 +143,18 @@ namespace tawashi {
 		}
 	}
 
-	auto SubmitPasteResponse::submit_to_redis (
+	auto SubmitPasteResponse::submit_to_storage (
 		const boost::string_ref& parText,
 		uint32_t parExpiry,
 		const boost::string_ref& parLang
 	) -> StringOrHeader {
-		auto& redis = this->redis();
-		if (not redis.is_connected()) {
-			return std::make_pair(boost::optional<std::string>(), make_error_redirect(ErrorReasons::RedisDisconnected));
-		}
-
+		auto& storage = this->storage();
 		std::string remote_ip = guess_real_remote_ip(cgi_env());
-		if (redis.get(remote_ip)) {
-			//please wait and submit again
-			return std::make_pair(boost::optional<std::string>(), make_error_redirect(ErrorReasons::UserFlooding));
-		}
-
-		const auto next_id = redis.incr("paste_counter");
-		const std::string token = num_to_token(next_id);
-		assert(not token.empty());
-		if (redis.hmset(token,
-			"pastie", parText,
-			"max_ttl", dhandy::lexical_cast<std::string>(parExpiry),
-			"lang", parLang)
-		) {
-			redis.set(remote_ip, "");
-			redis.expire(remote_ip, settings().as<uint32_t>("resubmit_wait"));
-			if (redis.expire(token, parExpiry))
-				return std::make_pair(boost::make_optional(token), HttpHeader());
-		}
-
-		return std::make_pair(boost::optional<std::string>(), make_error_redirect(ErrorReasons::PastieNotSaved));
+		Storage::SubmissionResult submission_res = storage.submit_pastie(parText, parExpiry, parLang, remote_ip);
+		if (not submission_res.error)
+			return std::make_pair(boost::make_optional(std::move(submission_res.token)), HttpHeader());
+		else
+			return std::make_pair(boost::optional<std::string>(), make_error_redirect(*submission_res.error));
 	}
 
 	HttpHeader SubmitPasteResponse::make_success_response (std::string&& parPastieParam) {

src/tawashi/submit_paste_response.hpp

@@ -41,6 +41,6 @@ namespace tawashi {
 		typedef std::pair<boost::optional<std::string>, HttpHeader> StringOrHeader;
 
 		virtual HttpHeader on_process() override;
-		StringOrHeader submit_to_redis (const boost::string_ref& parText, uint32_t parExpiry, const boost::string_ref& parLang);
+		StringOrHeader submit_to_storage (const boost::string_ref& parText, uint32_t parExpiry, const boost::string_ref& parLang);
 	};
 } //namespace tawashi