author | František Kučera <franta-hg@frantovo.cz> |
Sat, 09 Apr 2022 17:50:46 +0200 | |
branch | v_0 |
changeset 4 | 37a86904145c |
parent 3 | 1184f3de5533 |
child 5 | 121981e6bd54 |
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 <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; // XML is in UTF-8 |
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shared_ptr<relpipe::writer::RelationalWriter> relationalWriter; |
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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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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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std::vector<ResponseTemplate>* responseTemplates; |
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std::vector<GlobalHeaderTemplate>* headerTemplates; |
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std::mutex* templatesMutex; |
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public: |
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RequestHandler(std::mutex* templatesMutex, std::vector<ResponseTemplate>* responseTemplates, std::vector<GlobalHeaderTemplate>* headerTemplates) : templatesMutex(templatesMutex), responseTemplates(responseTemplates), headerTemplates(headerTemplates) { |
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} |
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virtual ~RequestHandler() = default; |
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const HTTPServer::Response handle(const HTTPServer::Request& request) override { |
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HTTPServer::Response response; |
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std::lock_guard<std::mutex> lock(*templatesMutex); |
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for (ResponseTemplate t : *responseTemplates) { |
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if (t.matches(request.method, request.url)) { |
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response.code = t.code; |
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response.body = t.body; |
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// TODO: replace global header values with request-specific ones instead of appending? |
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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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for (const HeaderTemplate& h : t.headers) response.header.push_back(HTTPServer::Header(h.name, h.value)); |
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return response; |
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} |
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} |
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response.code = 404; |
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response.body = "<h1>HTTP 404: Not Found</h1><p>(no response template matched)</p>"; |
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return response; |
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} |
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}; |
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std::shared_ptr<RequestHandler> requestHandler = std::make_shared<RequestHandler>(&templatesMutex, &responseTemplates, &headerTemplates); |
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relpipe::common::type::StringX getHeaderAttributePrefix() { |
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// might be configurable - parametrized |
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return L"header."; |
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} |
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bool isHeaderAttribute(const relpipe::common::type::StringX& attributeName) { |
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return attributeName.rfind(getHeaderAttributePrefix(), 0) == 0; |
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} |
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relpipe::common::type::StringX fetchHeaderName(const relpipe::common::type::StringX& attributeName) { |
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// TODO: recognize several modes: header.set.*, header.add.*, header.remove.* |
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return attributeName.substr(getHeaderAttributePrefix().size()); |
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} |
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void headerTemplateAttribute(const relpipe::common::type::StringX& value) { |
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auto attributeName = currentReaderMetadata[currentAttributeIndex].getAttributeName(); |
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153 |
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if (attributeName == L"url") headerTemplate.url = std::regex(value.size() ? convertor.to_bytes(value) : ".*"); |
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else if (attributeName == L"method") headerTemplate.method = std::regex(value.size() ? convertor.to_bytes(value) : ".*"); |
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else if (attributeName == L"name") headerTemplate.name = convertor.to_bytes(value); |
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else if (attributeName == L"value") headerTemplate.value = 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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159 |
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currentAttributeIndex++; |
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161 |
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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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headerTemplates.push_back(headerTemplate); |
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headerTemplate = GlobalHeaderTemplate(); |
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} |
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} |
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169 |
|
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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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172 |
|
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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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180 |
|
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currentAttributeIndex++; |
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182 |
|
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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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0 | 191 |
public: |
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1 | 193 |
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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} |
196 |
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197 |
virtual ~HttpdHandler() { |
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198 |
} |
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199 |
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200 |
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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} |
204 |
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205 |
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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211 |
void endOfPipe() { |
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sleep(60); // FIXME: run for configured interval or number of requests or forever (until some stop signal) |
0 | 213 |
} |
214 |
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215 |
}; |
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216 |
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217 |
} |
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218 |
} |
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219 |
} |