src/AwkHandler.h
author František Kučera <franta-hg@frantovo.cz>
Sun, 05 May 2019 23:09:20 +0200
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pass name-value pair to AWK
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/**
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 * Relational pipes
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 * Copyright © 2019 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, either version 3 of the License, or
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 * (at your option) any later version.
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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 <iostream>
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#include <sstream>
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#include <locale>
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#include <codecvt>
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#include <regex>
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#include <unistd.h>
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#include <wait.h>
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#include <ext/stdio_filebuf.h>
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#include <relpipe/reader/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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namespace relpipe {
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namespace tr {
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namespace awk {
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using namespace std;
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using namespace relpipe;
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using namespace relpipe::reader;
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using namespace relpipe::reader::handlers;
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/**
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 * This transformation consists of three processes connected together using pipes.
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 * 
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 * Processes:
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 *	- Parent: process RelationalReaderStringHandler events (read relational data, usually from STDIN) and pass them in the special text format to the pipe1
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 *  - AWK: external program (/usr/bin/awk), read from the pipe1, writes to the pipe2
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 *  - Writer: reads from the pipe2 and writes to relationalWriter (relational data, usually to STDOUT)
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 */
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class AwkHandler : public RelationalReaderStringHandler {
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private:
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	Configuration configuration;
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	writer::RelationalWriter* relationalWriter;
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	std::wstring_convert<codecvt_utf8<wchar_t>> convertor; // TODO: support also other encodings
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	int awkInputWriterFD = -1;
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	std::vector<AttributeMetadata> currentReaderMetadata;
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	integer_t currentAttributeIndex = 0;
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	void createPipe(int& readerFD, int& writerFD) {
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		int fds[2];
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		int result = pipe(fds);
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		readerFD = fds[0];
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		writerFD = fds[1];
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		if (result < 0) throw cli::RelpipeCLIException(L"Unable to create a pipe.", cli::CLI::EXIT_CODE_UNEXPECTED_ERROR); // TODO: better exceptions?
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	}
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	void redirectFD(int oldfd, int newfd) {
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		int result = dup2(oldfd, newfd);
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		if (result < 0) throw cli::RelpipeCLIException(L"Unable redirect FD.", cli::CLI::EXIT_CODE_UNEXPECTED_ERROR); // TODO: better exceptions?
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	}
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	void closeOrThrow(int fd) {
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		int error = close(fd);
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		if (error) throw cli::RelpipeCLIException(L"Unable to close FD: " + to_wstring(fd) + L" from PID: " + to_wstring(getpid()), cli::CLI::EXIT_CODE_UNEXPECTED_ERROR); // TODO: better exceptions?
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	}
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	void cleanUp() {
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		if (awkInputWriterFD >= 0) {
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			closeOrThrow(awkInputWriterFD);
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			// TODO: check exit codes
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			__pid_t waitResult1 = wait(NULL);
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			__pid_t waitResult2 = wait(NULL);
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			awkInputWriterFD = -1;
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		}
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		currentAttributeIndex = 0;
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		currentReaderMetadata.clear();
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	}
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	string_t a2v(const string_t& attributeName) {
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		// FIXME: escape reserved names; prefix with _ ?
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		// cat awkgram.y | awk -v FS='\\{"|",' -v ORS='|' '/static const struct token tokentab/, /\};/ { if (/^\{/) { print $2} }'
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		// BEGIN|BEGINFILE|END|ENDFILE|adump|and|asort|asorti|atan2|bindtextdomain|break|case|close|compl|continue|cos|dcgettext|dcngettext|default|delete|do|else|eval|exit|exp|fflush|for|func|function|gensub|getline|gsub|if|in|include|index|int|intdiv0|isarray|length|load|log|lshift|match|mktime|namespace|next|nextfile|or|patsplit|print|printf|rand|return|rshift|sin|split|sprintf|sqrt|srand|stopme|strftime|strtonum|sub|substr|switch|system|systime|tolower|toupper|typeof|while|xor
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		return attributeName;
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	}
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	string_t escapeAwkValue(const string_t& value) {
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		// FIXME: escape field and record separators
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		return value;
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	}
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public:
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	AwkHandler(writer::RelationalWriter* relationalWriter, Configuration& configuration) : relationalWriter(relationalWriter), configuration(configuration) {
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	}
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	void startRelation(string_t name, vector<AttributeMetadata> attributes) override {
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		cleanUp();
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		currentReaderMetadata = attributes;
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		int awkInputReaderFD;
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		int awkOutputReaderFD;
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		int awkOutputWriterFD;
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		createPipe(awkInputReaderFD, awkInputWriterFD);
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		createPipe(awkOutputReaderFD, awkOutputWriterFD);
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		__pid_t awkPid = fork();
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		if (awkPid < 0) {
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			throw cli::RelpipeCLIException(L"Unable to fork AWK process.", cli::CLI::EXIT_CODE_UNEXPECTED_ERROR); // TODO: better exceptions?
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		} else if (awkPid == 0) {
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			// AWK child process
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			closeOrThrow(awkInputWriterFD);
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			closeOrThrow(awkOutputReaderFD);
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			redirectFD(awkInputReaderFD, STDIN_FILENO);
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			redirectFD(awkOutputWriterFD, STDOUT_FILENO);
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			// Runs AWK program found on $PATH → user can plug-in a custom implementation or a wrapper, but this can be also bit dangerous (however AWK itself is dangerous).
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			execlp("awk", "awk", "BEGIN { FS=\"\\t\" }; {print \"AWK says: line \" NR \" '\" $0 \"' has \" NF \" fields; first field is '\" $1 \"'\";}", nullptr);
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		} else {
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			// Parent process
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			closeOrThrow(awkInputReaderFD);
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			closeOrThrow(awkOutputWriterFD);
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			__pid_t writerPid = fork();
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			if (writerPid < 0) {
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				throw cli::RelpipeCLIException(L"Unable to fork Writer process.", cli::CLI::EXIT_CODE_UNEXPECTED_ERROR); // TODO: better exceptions?
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			} else if (writerPid == 0) {
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				// Writer child process
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				closeOrThrow(awkInputWriterFD);
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				__gnu_cxx::stdio_filebuf<wchar_t> awkOutputReaderBuffer(awkOutputReaderFD, std::ios::in);
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				std::wistream awkOutputReader(&awkOutputReaderBuffer);
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				relationalWriter->startRelation(L"writer_debug",{
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					{L"message", writer::TypeId::STRING},
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				}, true);
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				for (string_t line; getline(awkOutputReader, line).good();) {
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					relationalWriter->writeAttribute(line);
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				}
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				closeOrThrow(awkOutputReaderFD);
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				exit(0);
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			} else {
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				// Parent process
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				closeOrThrow(awkOutputReaderFD);
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			}
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		}
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	}
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	void attribute(const string_t& value) override {
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		string_t variableName = a2v(currentReaderMetadata[currentAttributeIndex].getAttributeName());
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		string_t variableValue = escapeAwkValue(value);
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		currentAttributeIndex++;
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		currentAttributeIndex = currentAttributeIndex % currentReaderMetadata.size();
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		// TODO: just the value – move name to the AWK function
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		std::string variablePair = convertor.to_bytes(variableName + L"=" + variableValue);
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		if (currentAttributeIndex == 0) variablePair += "\n";
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		else variablePair += "\t";
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		write(awkInputWriterFD, variablePair.c_str(), variablePair.length());
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	}
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	void endOfPipe() {
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		cleanUp();
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	}
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};
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}
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}
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}