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lib/curl/Delegate: helper class for response body parsers

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Eliminate duplicate code.
This commit is contained in:
Max Kellermann
2018-01-21 20:31:59 +01:00
parent 8b42fd0a28
commit 1da64fb79c
12 changed files with 375 additions and 162 deletions
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54
src/lib/curl/Delegate.cxx Normal file
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/*
* Copyright (C) 2008-2018 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "Delegate.hxx"
#include "Parser.hxx"
#include <assert.h>
void
DelegateCurlResponseHandler::OnHeaders(unsigned status,
std::multimap<std::string, std::string> &&headers)
{
parser = MakeParser(status, std::move(headers));
assert(parser);
}
void
DelegateCurlResponseHandler::OnData(ConstBuffer<void> data)
{
parser->OnData(data);
}
void
DelegateCurlResponseHandler::OnEnd()
{
parser->OnEnd();
FinishParser(std::move(parser));
}

73
src/lib/curl/Delegate.hxx Normal file
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/*
* Copyright (C) 2008-2018 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CURL_DELEGATE_HXX
#define CURL_DELEGATE_HXX
#include "Handler.hxx"
#include <memory>
class CurlResponseParser;
/**
* A #CurlResponseHandler implementation which delegates response body
* parsing to another object which is created dynamically. This is
* useful when a different parser needs to be used under certain
* runtime conditions (e.g. depending on the status or content type).
*/
class DelegateCurlResponseHandler : public CurlResponseHandler {
std::unique_ptr<CurlResponseParser> parser;
protected:
/**
* HTTP response headers have been received, and we now need a
* parser. This method constructs one and returns it (or
* throws an exception which will be passed to
* CurlResponseParser::OnError()).
*/
virtual std::unique_ptr<CurlResponseParser> MakeParser(unsigned status,
std::multimap<std::string, std::string> &&headers) = 0;
/**
* The parser has finished parsing the response body. This
* method can be used to evaluate the result. Exceptions
* thrown by this method will be passed to
* CurlResponseParser::OnError().
*/
virtual void FinishParser(std::unique_ptr<CurlResponseParser> p) = 0;
public:
void OnHeaders(unsigned status,
std::multimap<std::string, std::string> &&headers) final;
void OnData(ConstBuffer<void> data) final;
void OnEnd() final;
};
#endif

42
src/lib/curl/Parser.hxx Normal file
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/*
* Copyright (C) 2008-2018 Max Kellermann <max.kellermann@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef CURL_PARSER_HXX
#define CURL_PARSER_HXX
template<typename T> struct ConstBuffer;
class CurlResponseParser {
public:
virtual ~CurlResponseParser() = default;
virtual void OnData(ConstBuffer<void> data) = 0;
virtual void OnEnd() = 0;
};
#endif