author | František Kučera <franta-hg@frantovo.cz> |
Sat, 16 Apr 2022 02:43:50 +0200 | |
branch | v_0 |
changeset 5 | 121981e6bd54 |
parent 4 | 37a86904145c |
child 6 | b04bde9083d4 |
permissions | -rw-r--r-- |
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/** |
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* Relational pipes |
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* Copyright © 2022 František Kučera (Frantovo.cz, GlobalCode.info) |
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* |
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* This program is free software: you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation, version 3 of the License. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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#pragma once |
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#include <memory> |
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#include <string> |
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#include <vector> |
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#include <codecvt> |
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#include <regex> |
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#include <stdexcept> |
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#include <mutex> |
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#include <shared_mutex> |
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#include <iomanip> |
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#include <uuid/uuid.h> |
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#include <relpipe/common/type/typedefs.h> |
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#include <relpipe/reader/TypeId.h> |
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#include <relpipe/reader/handlers/RelationalReaderStringHandler.h> |
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#include <relpipe/reader/handlers/AttributeMetadata.h> |
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#include <relpipe/writer/Factory.h> |
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#include <relpipe/cli/RelpipeCLIException.h> |
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#include "Configuration.h" |
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#include "HTTPServer.h" |
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namespace relpipe { |
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namespace tr { |
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namespace httpd { |
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class HttpdHandler : public relpipe::reader::handlers::RelationalReaderStringHandler { |
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private: |
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std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encoding than UTF-8 |
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shared_ptr<relpipe::writer::RelationalWriter> relationalWriter; |
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std::mutex relationalWriterMutex; |
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Configuration configuration; |
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std::shared_ptr<HTTPServer> httpServer; |
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relpipe::common::type::StringX currentRelationName; |
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std::vector<relpipe::reader::handlers::AttributeMetadata> currentReaderMetadata; |
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std::vector<relpipe::writer::AttributeMetadata> currentWriterMetadata; |
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size_t currentAttributeIndex = 0; |
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size_t currentRecordNumber = 1; |
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class RequestMatcher { |
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public: |
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std::regex method = std::regex(".*"); |
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std::regex url = std::regex(".*"); |
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virtual ~RequestMatcher() = default; |
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bool matches(const std::string& method, const std::string& url) const { |
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bool result = true; |
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result &= std::regex_match(method, this->method); |
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result &= std::regex_match(url, this->url); |
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return result; |
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} |
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}; |
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class HeaderTemplate { |
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public: |
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std::string name; |
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std::string value; |
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HeaderTemplate() { |
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} |
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HeaderTemplate(std::string name, std::string value) : name(name), value(value) { |
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} |
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virtual ~HeaderTemplate() = default; |
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}; |
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class GlobalHeaderTemplate : public HeaderTemplate, public RequestMatcher { |
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} headerTemplate; |
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std::vector<GlobalHeaderTemplate> headerTemplates; |
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class ResponseTemplate : public RequestMatcher { |
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public: |
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std::string body; |
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uint16_t code = 200; |
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std::vector<HeaderTemplate> headers; |
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} responseTemplate; |
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std::vector<ResponseTemplate> responseTemplates; |
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std::mutex templatesMutex; // TODO: read-write lock (for responseTemplates and headerTemplates) |
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class RequestHandler : public HTTPServer::RequestHandler { |
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private: |
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shared_ptr<relpipe::writer::RelationalWriter> relationalWriter; |
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std::mutex* relationalWriterMutex; |
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std::vector<ResponseTemplate>* responseTemplates; |
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std::vector<GlobalHeaderTemplate>* headerTemplates; |
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std::mutex* templatesMutex; |
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void writeExchange(const HTTPServer::Request& request, const HTTPServer::Response& response) { |
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std::wstring_convert < codecvt_utf8<wchar_t>> convertor; // TODO: support also other encoding than UTF-8 |
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std::lock_guard<std::mutex> lock(*relationalWriterMutex); |
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auto exchangeId = convertor.from_bytes(generateExchangeId()); |
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// TODO: multiple modes: |
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// a) interleaved (current) |
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// b) write exchanges immediatelly + cache headers and flush them at the end |
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// TODO: data types |
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// TODO: support multiple encodings |
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relationalWriter->startRelation(L"exchange",{ |
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{L"id", relpipe::writer::TypeId::STRING}, |
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{L"url", relpipe::writer::TypeId::STRING}, |
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{L"method", relpipe::writer::TypeId::STRING}, |
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{L"request_text", relpipe::writer::TypeId::STRING}, |
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{L"request_data", relpipe::writer::TypeId::STRING}, |
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{L"response_text", relpipe::writer::TypeId::STRING}, |
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{L"response_data", relpipe::writer::TypeId::STRING}, |
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{L"response_code", relpipe::writer::TypeId::INTEGER}, |
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}, true); |
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relationalWriter->writeAttribute(exchangeId); |
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relationalWriter->writeAttribute(convertor.from_bytes(request.url)); |
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relationalWriter->writeAttribute(convertor.from_bytes(request.method)); |
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relationalWriter->writeAttribute(bodyToText(convertor, request.body)); |
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relationalWriter->writeAttribute(bodyToHex(convertor, request.body)); |
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relationalWriter->writeAttribute(bodyToText(convertor, response.body)); |
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relationalWriter->writeAttribute(bodyToHex(convertor, response.body)); |
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relationalWriter->writeAttribute(std::to_wstring(response.code)); |
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relationalWriter->startRelation(L"header",{ |
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{L"exchange", relpipe::writer::TypeId::STRING}, |
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{L"url", relpipe::writer::TypeId::STRING}, |
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{L"direction", relpipe::writer::TypeId::STRING}, |
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{L"name", relpipe::writer::TypeId::STRING}, |
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{L"value", relpipe::writer::TypeId::STRING}, |
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154 |
}, true); |
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155 |
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156 |
for (const HTTPServer::Header& h : request.header) { |
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157 |
relationalWriter->writeAttribute(exchangeId); |
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158 |
relationalWriter->writeAttribute(convertor.from_bytes(request.url)); |
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159 |
relationalWriter->writeAttribute(L"request"); |
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160 |
relationalWriter->writeAttribute(convertor.from_bytes(h.name)); |
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161 |
relationalWriter->writeAttribute(convertor.from_bytes(h.value)); |
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162 |
} |
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163 |
|
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164 |
for (const HTTPServer::Header& h : response.header) { |
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165 |
relationalWriter->writeAttribute(exchangeId); |
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166 |
relationalWriter->writeAttribute(convertor.from_bytes(request.url)); |
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167 |
relationalWriter->writeAttribute(L"response"); |
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168 |
relationalWriter->writeAttribute(convertor.from_bytes(h.name)); |
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169 |
relationalWriter->writeAttribute(convertor.from_bytes(h.value)); |
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170 |
} |
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171 |
|
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172 |
|
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173 |
|
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174 |
} |
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175 |
|
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176 |
relpipe::common::type::StringX bodyToText(std::wstring_convert < codecvt_utf8<wchar_t>>&convertor, const std::string& body, bool* validEncoding = nullptr) { |
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177 |
try { |
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178 |
if (validEncoding) *validEncoding = true; |
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// TODO: use encoding from the HTTP response headers instead of the constant one? |
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return convertor.from_bytes(body); |
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181 |
} catch (...) { |
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if (validEncoding) *validEncoding = false; |
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183 |
std::stringstream filtered; |
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for (char ch : body) filtered << (ch >= ' ' && ch < 127 ? ch : '.'); |
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return convertor.from_bytes(filtered.str()); |
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186 |
} |
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187 |
} |
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188 |
|
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189 |
relpipe::common::type::StringX bodyToHex(std::wstring_convert < codecvt_utf8<wchar_t>>&convertor, const std::string& body) { |
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190 |
std::stringstream hex; |
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191 |
hex << std::hex << std::setfill('0') << std::hex; |
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192 |
for (size_t i = 0, size = body.size(); i < size; i++) hex << std::setw(2) << (0xff & body[i]); |
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193 |
return convertor.from_bytes(hex.str()); |
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194 |
} |
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195 |
|
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196 |
std::string generateExchangeId() { |
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197 |
char buffer[37]; |
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198 |
uuid_t uuid; |
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uuid_generate_random(uuid); |
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// uuid_generate_time(uuid); |
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201 |
uuid_unparse_lower(uuid, buffer); |
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202 |
return buffer; |
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203 |
} |
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204 |
|
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205 |
public: |
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206 |
|
5
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207 |
RequestHandler(shared_ptr<relpipe::writer::RelationalWriter> relationalWriter, std::mutex* relationalWriterMutex, std::vector<ResponseTemplate>* responseTemplates, std::vector<GlobalHeaderTemplate>* headerTemplates, std::mutex* templatesMutex) : |
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208 |
relationalWriter(relationalWriter), relationalWriterMutex(relationalWriterMutex), responseTemplates(responseTemplates), headerTemplates(headerTemplates), templatesMutex(templatesMutex) { |
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209 |
} |
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210 |
|
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211 |
virtual ~RequestHandler() = default; |
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212 |
|
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213 |
const HTTPServer::Response handle(const HTTPServer::Request& request) override { |
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214 |
HTTPServer::Response response; |
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|
215 |
|
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216 |
response.code = 404; |
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217 |
response.body = "<h1>HTTP 404: Not Found</h1><p>(no response template matched)</p>"; |
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218 |
|
4
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219 |
std::lock_guard<std::mutex> lock(*templatesMutex); |
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220 |
for (ResponseTemplate t : *responseTemplates) { |
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221 |
if (t.matches(request.method, request.url)) { |
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222 |
response.code = t.code; |
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223 |
response.body = t.body; |
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224 |
// TODO: replace global header values with request-specific ones instead of appending? |
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225 |
for (const GlobalHeaderTemplate& h : *headerTemplates) if (h.matches(request.method, request.url)) response.header.push_back(HTTPServer::Header(h.name, h.value)); |
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226 |
for (const HeaderTemplate& h : t.headers) response.header.push_back(HTTPServer::Header(h.name, h.value)); |
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227 |
break; |
4
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228 |
} |
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229 |
} |
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230 |
|
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231 |
writeExchange(request, response); |
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232 |
return response; |
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233 |
} |
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234 |
|
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235 |
}; |
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236 |
|
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237 |
std::shared_ptr<RequestHandler> requestHandler = std::make_shared<RequestHandler>(relationalWriter, &relationalWriterMutex, &responseTemplates, &headerTemplates, &templatesMutex); |
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|
238 |
|
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239 |
relpipe::common::type::StringX getHeaderAttributePrefix() { |
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240 |
// might be configurable - parametrized |
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241 |
return L"header."; |
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|
242 |
} |
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|
243 |
|
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244 |
bool isHeaderAttribute(const relpipe::common::type::StringX& attributeName) { |
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245 |
return attributeName.rfind(getHeaderAttributePrefix(), 0) == 0; |
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246 |
} |
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247 |
|
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248 |
relpipe::common::type::StringX fetchHeaderName(const relpipe::common::type::StringX& attributeName) { |
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249 |
// TODO: recognize several modes: header.set.*, header.add.*, header.remove.* |
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250 |
return attributeName.substr(getHeaderAttributePrefix().size()); |
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251 |
} |
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|
252 |
|
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253 |
void headerTemplateAttribute(const relpipe::common::type::StringX& value) { |
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254 |
auto attributeName = currentReaderMetadata[currentAttributeIndex].getAttributeName(); |
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255 |
|
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256 |
if (attributeName == L"url") headerTemplate.url = std::regex(value.size() ? convertor.to_bytes(value) : ".*"); |
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257 |
else if (attributeName == L"method") headerTemplate.method = std::regex(value.size() ? convertor.to_bytes(value) : ".*"); |
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258 |
else if (attributeName == L"name") headerTemplate.name = convertor.to_bytes(value); |
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259 |
else if (attributeName == L"value") headerTemplate.value = convertor.to_bytes(value); // TODO: header encoding? |
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260 |
else throw std::invalid_argument("Unsupported attribute in the request_template relation: " + convertor.to_bytes(attributeName + L" = " + value)); |
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|
261 |
|
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|
262 |
currentAttributeIndex++; |
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|
263 |
|
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|
264 |
if (currentAttributeIndex % currentReaderMetadata.size() == 0) { |
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std::lock_guard<std::mutex> lock(templatesMutex); |
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currentAttributeIndex = 0; |
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headerTemplates.push_back(headerTemplate); |
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headerTemplate = GlobalHeaderTemplate(); |
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} |
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} |
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void responseTemplateAttribute(const relpipe::common::type::StringX& value) { |
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auto attributeName = currentReaderMetadata[currentAttributeIndex].getAttributeName(); |
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if (attributeName == L"url") responseTemplate.url = std::regex(value.size() ? convertor.to_bytes(value) : ".*"); |
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else if (attributeName == L"method") responseTemplate.method = std::regex(value.size() ? convertor.to_bytes(value) : ".*"); |
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else if (attributeName == L"code") responseTemplate.code = std::stoi(value); |
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else if (attributeName == L"text") responseTemplate.body = convertor.to_bytes(value); |
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else if (attributeName == L"data") responseTemplate.body = "TODO: read binary data: " + convertor.to_bytes(value); // TODO: read hex/binary request body |
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else if (isHeaderAttribute(attributeName)) responseTemplate.headers.push_back(HeaderTemplate(convertor.to_bytes(fetchHeaderName(attributeName)), convertor.to_bytes(value))); // TODO: header encoding? |
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else throw std::invalid_argument("Unsupported attribute in the request_template relation: " + convertor.to_bytes(attributeName + L" = " + value)); |
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currentAttributeIndex++; |
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if (currentAttributeIndex % currentReaderMetadata.size() == 0) { |
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std::lock_guard<std::mutex> lock(templatesMutex); |
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currentAttributeIndex = 0; |
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responseTemplates.push_back(responseTemplate); |
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responseTemplate = ResponseTemplate(); |
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} |
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} |
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public: |
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HttpdHandler(shared_ptr<relpipe::writer::RelationalWriter> relationalWriter, Configuration configuration, std::shared_ptr<HTTPServer> httpServer) : relationalWriter(relationalWriter), configuration(configuration), httpServer(httpServer) { |
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httpServer->setRequestHandler(requestHandler); |
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} |
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virtual ~HttpdHandler() { |
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} |
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void startRelation(relpipe::common::type::StringX name, std::vector<relpipe::reader::handlers::AttributeMetadata> attributes) override { |
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currentRelationName = name; |
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currentReaderMetadata = attributes; |
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} |
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void attribute(const relpipe::common::type::StringX& value) override { |
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if (currentRelationName == L"header_template") headerTemplateAttribute(value); |
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else if (currentRelationName == L"response_template") responseTemplateAttribute(value); |
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else throw std::invalid_argument("Unsupported relation: " + convertor.to_bytes(currentRelationName)); |
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} |
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void endOfPipe() { |
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sleep(60); // FIXME: run for configured interval or number of requests or forever (until some stop signal) |
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} |
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}; |
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} |
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} |
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} |