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#include "statistics.h"
#include "libcommon/file.h"
#include "libcommon/tempfile.h"
#include <boost/algorithm/string/predicate.hpp>
#include <boost/algorithm/string/split.hpp>
#include <boost/coroutine2/coroutine.hpp>
#include <boost/process.hpp>
#include <algorithm>
#include <filesystem>
#include <fstream>
#include <iostream>
#include <string>
#include <unordered_map>
using namespace std::string_literals;
namespace bp = boost::process;
namespace fs = std::filesystem;
namespace {
// Used to return errors by generating response page and HTTP status code
std::string HttpStatus(std::string status, std::string message, std::function<plugin_interface_setter_type>& SetResponseHeader)
{
SetResponseHeader("status", status);
SetResponseHeader("content_type", "text/html");
return status + " " + message;
}
std::string statsPng(std::function<std::string(const std::string& key)>& GetServerParam,
std::function<plugin_interface_setter_type>& SetResponseHeader)
{
// Create PNG statistics via Gnuplot
std::string statistics{GetServerParam("statistics")};
Tempfile tempStats{".txt"}; // input data
File::setFile(tempStats.GetPath(), statistics);
Tempfile tempPng{".png"}; // output
Tempfile tempGnuplot{".gnuplot"};
std::stringstream s;
s << "set terminal png truecolor\n";
s << "set output " << tempPng.GetPath() << "\n"; // quotes added automatically for paths
s << "set title \"Webserver Throughput\"\n";
s << "set xlabel \"Time\"\n";
s << "set timefmt \"%s\"\n";
s << "set format x \"%Y-%m-%d\"\n";
s << "set xdata time\n";
s << "set xtics rotate by 45 right\n";
s << "set ylabel \"Bytes\"\n";
s << "set datafile separator \",\"\n";
s << "set grid\n";
s << "set style fill solid\n";
s << "plot " << tempStats.GetPath() << " using 1:($4+$5) with boxes title \"Bytes I/O\" lt rgb \"#1132A7\"\n";
File::setFile(tempGnuplot.GetPath(), s.str());
int exit_code{system(("gnuplot "s + tempGnuplot.GetPath().generic_string()).c_str())};
if (exit_code) {
std::cerr << "Error: gnuplot returned " << std::to_string(exit_code) << std::endl;
return HttpStatus("500", "Statistics error"s, SetResponseHeader);
}
SetResponseHeader("content_type", "image/png");
return File::getFile(tempPng.GetPath());
}
// returns sum over specified column
uint64_t getSum(const std::string& stats, size_t column)
{
uint64_t result{0};
std::istringstream is{stats};
std::string line;
while (std::getline(is, line) && !is.eof()) {
std::vector<std::string> elements;
boost::algorithm::split(elements, line, [](char c){ return c == ','; });
if (column >= elements.size()) {
std::cerr << "Error: No column " << column << " found." << std::endl;
return 0;
}
try {
result += stoull(elements[column]);
} catch(...) {
std::cerr << "Error: Stats value " << elements[column] << " malformed." << std::endl;
}
}
return result;
}
} // anonymous namespace
std::string statistics_plugin::name()
{
return "statistics";
}
statistics_plugin::statistics_plugin()
{
//std::cout << "Plugin constructor" << std::endl;
}
statistics_plugin::~statistics_plugin()
{
//std::cout << "Plugin destructor" << std::endl;
}
std::string statistics_plugin::generate_page(
std::function<std::string(const std::string& key)>& GetServerParam,
std::function<std::string(const std::string& key)>& GetRequestParam, // request including body (POST...)
std::function<void(const std::string& key, const std::string& value)>& SetResponseHeader // to be added to result string
)
{
try {
// Request path must not contain "..".
std::string rel_target{GetRequestParam("rel_target")};
size_t query_pos{rel_target.find("?")};
if (query_pos != rel_target.npos)
rel_target = rel_target.substr(0, query_pos);
std::string target{GetRequestParam("target")};
if (rel_target.find("..") != std::string::npos) {
return HttpStatus("400", "Illegal request: "s + target, SetResponseHeader);
}
// Build the path to the requested file
std::string doc_root{GetRequestParam("doc_root")};
fs::path path {fs::path{doc_root} / rel_target};
if (target.size() && target.back() != '/' && fs::is_directory(path)) {
std::string location{GetRequestParam("location") + "/"s};
SetResponseHeader("location", location);
return HttpStatus("301", "Correcting directory path", SetResponseHeader); // 301 Moved Permanently
}
if (path.filename() == "stats.png")
return statsPng(GetServerParam, SetResponseHeader);
try {
SetResponseHeader("content_type", "text/html");
std::string header {"<!DOCTYPE html><html><head>"
"<meta charset=\"utf-8\"/>"
"<title>Webserver Statistics</title>"
"</head><body>"};
std::string footer{"<br/><br/><br/></body></html>"};
std::string result{header};
std::string statistics{GetServerParam("statistics")};
double ipv6_fraction_by_requests {double(getSum(statistics, 5)) / getSum(statistics, 1)};
double ipv6_fraction_by_bytes {double(getSum(statistics, 7) + getSum(statistics, 8)) / (getSum(statistics, 3) + getSum(statistics, 4))};
double https_fraction_by_requests {double(getSum(statistics, 9)) / getSum(statistics, 1)};
double https_fraction_by_bytes {double(getSum(statistics, 11) + getSum(statistics, 12)) / (getSum(statistics, 3) + getSum(statistics, 4))};
result += "<h1>Webserver Statistics</h1>";
result += "<p>Host uptime: "s + GetServerParam("uptime_host") + "</p>";
result += "<p>Webserver uptime: "s + GetServerParam("uptime_webserver") + "</p>";
result += "<p>IPv6 fraction by requests: "s + std::to_string(ipv6_fraction_by_requests * 100) + "%</p>";
result += "<p>IPv6 fraction by bytes: "s + std::to_string(ipv6_fraction_by_bytes * 100) + "%</p>";
result += "<p>HTTPS fraction by requests: "s + std::to_string(https_fraction_by_requests * 100) + "%</p>";
result += "<p>HTTPS fraction by bytes: "s + std::to_string(https_fraction_by_bytes * 100) + "%</p>";
result += "<p><img src=\"stats.png\"/></p>";
result += "<pre>"s + statistics + "</pre>"s;
result += footer;
return result;
} catch (const std::exception& ex) {
return HttpStatus("500", "Statistics error: "s + ex.what(), SetResponseHeader);
}
} catch (const std::exception& ex) {
return HttpStatus("500", "Unknown Error: "s + ex.what(), SetResponseHeader);
}
}
bool statistics_plugin::has_own_authentication()
{
return false;
}
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