Some experiment for casual log parsing for @SuperBuker

log-parser.cc

#include <iostream>
#include <fstream>
#include <sstream>
#include <string>
#include <vector>
#include <regex>
#include <time.h>

using namespace std;

struct LogEntry
{
    string verb;
    string path;
    int code;
    int responseSize;
    int timestamp;
};

int main()
{
    cout << "Parsing log file..." << endl;

    // [23/Jul/2015:06:25:27 +0200] "GET / HTTP/1.1" 200 8939
    const regex r("\\[([^\\]]+)\\] \\\"([\\S]+) ([\\S]+) HTTP/1.1\\\" ([\\d]+) ([\\d]+)");
    const string dateFormat("%d/%b/%Y:%H:%M:%S %z");

    // Open file stream
    ifstream logfile("test4.log");
    vector<LogEntry> logEntries;

    smatch match;
    string line;
    while (getline(logfile, line))
    {
        try
        {
            if (!regex_search(line, match, r))
                continue;
        }
        catch (regex_error& e)
        {
            cerr << "PARSING ERROR: " << e.code() << endl;
        }

        string date;
        LogEntry entry;
        date = match[1];
        entry.verb = match[2];
        entry.path = match[3];
        entry.code = stoi(match[4]);
        entry.responseSize = stoi(match[5]);

        tm tm;
        strptime(date.c_str(), dateFormat.c_str(), &tm);
        entry.timestamp = mktime(&tm);

        logEntries.push_back(entry);

        cout << "HTTP Request at " << date << ": ";
        cout << entry.verb << " " << entry.path << ". ";
        cout << "Response code " << entry.code << " with " << entry.responseSize << "B." << endl;
    }

    cout << "Done! :)" << endl;
    return 0;
}

Makefile

compile: parser.cc
	g++-4.9 -std=c++14 -I. -O3 -o parser parser.cc