Class: LogViewer::CLI

Inherits:
Object
  • Object
show all
Defined in:
lib/logviewer.rb

Constant Summary collapse

LOG_LEVELS = 
{
  'trace' => 0,
  'debug' => 1,
  'info' => 2,
  'notice' => 3,
  'warning' => 4,
  'error' => 5,
  'critical' => 6
}

Instance Method Summary collapse

Constructor Details

#initialize(args = ARGV) ⇒ CLI

Returns a new instance of CLI.



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# File 'lib/logviewer.rb', line 19

def initialize(args = ARGV)
  @args = args
  @min_level = 'debug'
  @input_file = nil
end

Instance Method Details

#extract_filename(file_path) ⇒ Object 



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# File 'lib/logviewer.rb', line 146

def extract_filename(file_path)
  return '' if file_path.nil? || file_path.empty?
  File.basename(file_path)
end

#find_most_recent_ndjson_file ⇒ Object 



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# File 'lib/logviewer.rb', line 69

def find_most_recent_ndjson_file
  ndjson_files = Dir.glob('*.ndjson')
  return nil if ndjson_files.empty?
  
  # Sort by modification time (most recent first) and return the first one
  ndjson_files.max_by { |file| File.mtime(file) }
end

#format_timestamp(timestamp) ⇒ Object 



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# File 'lib/logviewer.rb', line 134

def format_timestamp(timestamp)
  return '' if timestamp.nil? || timestamp == ''
  
  begin
    # Convert milliseconds to seconds for Time.at
    time = Time.at(timestamp / 1000.0)
    time.strftime('%m/%d %H:%M:%S')
  rescue => e
    timestamp.to_s # fallback to original if parsing fails
  end
end

#generate_html(logs) ⇒ Object 



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# File 'lib/logviewer.rb', line 151

def generate_html(logs)
  html = <<~HTML
    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Log Viewer - #{File.basename(@input_file)}</title>
        <style>
            body {
                font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
                margin: 0;
                padding: 20px;
                background-color: #1a1a1a;
                color: #e0e0e0;
            }
            .container {
                max-width: 1800px;
                margin: 0 auto;
                background: #2d2d2d;
                border-radius: 8px;
                box-shadow: 0 2px 10px rgba(0,0,0,0.3);
                overflow: hidden;
            }
            .header {
                background: #1e1e1e;
                color: #f0f0f0;
                padding: 20px;
                text-align: center;
            }
            .header h1 {
                margin: 0;
                font-size: 24px;
            }
            .header p {
                margin: 5px 0 0 0;
                opacity: 0.8;
            }
            .table-container {
                overflow-x: auto;
            }
            table {
                width: 100%;
                border-collapse: collapse;
                font-size: 18px;
                table-layout: fixed;
            }
            th {
                background: #3a3a3a;
                color: #f0f0f0;
                padding: 18px;
                text-align: left;
                font-weight: 600;
                border-bottom: 2px solid #555555;
                position: sticky;
                top: 0;
            }
            td {
                padding: 15px 18px;
                border-bottom: 1px solid #404040;
                vertical-align: top;
                color: #e0e0e0;
            }
            tr:hover {
                background-color: #3a3a3a;
            }
            .level {
                font-weight: bold;
                text-transform: uppercase;
                font-size: 16px;
                white-space: nowrap;
            }
            .text {
                word-wrap: break-word;
                white-space: pre-wrap;
                width: auto;
            }
            .file {
                font-family: 'Monaco', 'Menlo', monospace;
                font-size: 16px;
                color: #b0b0b0;
                max-width: 200px;
                word-wrap: break-word;
            }
            .method {
                font-family: 'Monaco', 'Menlo', monospace;
                font-size: 16px;
                color: #d0d0d0;
                font-weight: 500;
                max-width: 300px;
                word-wrap: break-word;
                overflow-wrap: break-word;
            }
            .timestamp {
                font-family: 'Monaco', 'Menlo', monospace;
                font-size: 15px;
                color: #b0b0b0;
                white-space: nowrap;
            }
            .tag {
                font-family: 'Monaco', 'Menlo', monospace;
                font-size: 16px;
                color: #5dade2;
                font-weight: 500;
                word-wrap: break-word;
                overflow-wrap: break-word;
            }

            .empty {
                color: #777;
                font-style: italic;
            }
        </style>
    </head>
    <body>
        <div class="container">
            <div class="header">
                <h1>Log Viewer</h1>
                <p>#{File.basename(@input_file)} • #{logs.length} entries • Level: #{@min_level.upcase}+</p>
                <div style="margin-top: 15px;">
                    <label for="levelFilter" style="color: white; margin-right: 10px;">Filter by level:</label>
                    <select id="levelFilter" style="padding: 5px; font-size: 14px; border-radius: 4px; border: none; background-color: #3a3a3a; color: #f0f0f0;">
  HTML

# Generate dropdown options only for levels >= command line minimum
min_level_num = LOG_LEVELS[@min_level]
LOG_LEVELS.each do |level, level_num|
  if level_num >= min_level_num
    html += <<~HTML
                        <option value="#{level}">#{level.upcase}+</option>
    HTML
  end
end

html += <<~HTML
                    </select>
                </div>
            </div>
            <div class="table-container">
                <table>
                    <thead>
                        <tr>
                            <th style="width: 120px;">Date</th>
                            <th style="width: 80px;">Level</th>
                            <th style="width: 120px;">Tag</th>
                            <th style="width: 180px;">File</th>
                            <th style="width: 300px;">Function</th>
                            <th style="width: auto;">Text</th>
                        </tr>
                    </thead>
                    <tbody>
  HTML

  logs.each do |log|
    level_style = "color: #{level_color(log[:level])}"
    formatted_timestamp = format_timestamp(log[:timestamp])
    timestamp_content = formatted_timestamp.empty? ? '<span class="empty">-</span>' : formatted_timestamp
    tag_content = log[:tag].empty? ? '<span class="empty">-</span>' : log[:tag]
    text_content = log[:text].empty? ? '<span class="empty">-</span>' : log[:text]
    filename = extract_filename(log[:file])
    file_content = filename.empty? ? '<span class="empty">-</span>' : filename
    method_content = log[:method].empty? ? '<span class="empty">-</span>' : log[:method]
    
    html += <<~HTML
                            <tr data-level="#{log[:level].downcase}" data-level-num="#{LOG_LEVELS[log[:level].downcase] || 0}">
                                <td class="timestamp">#{timestamp_content}</td>
                                <td class="level" style="#{level_style}">#{log[:level]}</td>
                                <td class="tag">#{tag_content}</td>
                                <td class="file">#{file_content}</td>
                                <td class="method">#{method_content}</td>
                                <td class="text">#{text_content}</td>
                            </tr>
    HTML
  end

  html += <<~HTML
                    </tbody>
                </table>
            </div>
        </div>
      
        <script>
            const LOG_LEVELS = {
                'trace': 0,
                'debug': 1,
                'info': 2,
                'notice': 3,
                'warning': 4,
                'error': 5,
                'critical': 6
            };
          
            const levelFilter = document.getElementById('levelFilter');
            const tableRows = document.querySelectorAll('tbody tr');
          
            // Set initial filter to match command line parameter
            levelFilter.value = '#{@min_level}';
          
            function filterByLevel() {
                const selectedLevel = levelFilter.value;
                const selectedLevelNum = LOG_LEVELS[selectedLevel];
                let visibleCount = 0;
              
                tableRows.forEach(row => {
                    const rowLevelNum = parseInt(row.dataset.levelNum);
                    if (rowLevelNum >= selectedLevelNum) {
                        row.style.display = '';
                        visibleCount++;
                    } else {
                        row.style.display = 'none';
                    }
                });
              
                // Update the header count
                const header = document.querySelector('.header p');
                const originalText = header.textContent.split(' • ');
                originalText[1] = visibleCount + ' entries';
                originalText[2] = 'Level: ' + selectedLevel.toUpperCase() + '+';
                header.textContent = originalText.join(' • ');
            }
          
            levelFilter.addEventListener('change', filterByLevel);
          
            // Apply initial filter
            filterByLevel();
        </script>
    </body>
    </html>
  HTML

  html
end

#level_color(level) ⇒ Object 



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# File 'lib/logviewer.rb', line 113

def level_color(level)
  case level.downcase
  when 'trace'
    '#adb5bd'
  when 'debug'
    '#adb5bd'
  when 'info'
    '#6ea8fe'
  when 'notice'
    '#ffc107'
  when 'warning'
    '#fd9843'
  when 'error'
    '#ea868f'
  when 'critical'
    '#c29ffa'
  else
    '#e0e0e0'
  end
end

#parse_logs ⇒ Object 



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# File 'lib/logviewer.rb', line 82

def parse_logs
  logs = []
  
  File.foreach(@input_file) do |line|
    begin
      log_entry = JSON.parse(line.strip)
      
      if should_include_log?(log_entry['levelName'])
        # Build tag from subsystem/category
        tag = []
        tag << log_entry['subsystem'] if log_entry['subsystem']
        tag << log_entry['category'] if log_entry['category']
        tag_string = tag.join('/')
        
        logs << {
          timestamp: log_entry['timestamp'] || '',
          level: log_entry['levelName'] || 'unknown',
          tag: tag_string,
          text: log_entry['message'] || '',
          file: log_entry['file'] || '',
          method: log_entry['function'] || ''
        }
      end
    rescue JSON::ParserError => e
      puts "Warning: Skipping invalid JSON line: #{e.message}"
    end
  end
  
  logs
end

#parse_options ⇒ Object 



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# File 'lib/logviewer.rb', line 25

def parse_options
  OptionParser.new do |opts|
    opts.banner = "Usage: logviewer [options] [ndjson_file]"
    
    opts.on('-l', '--level LEVEL', 'Minimum log level (trace, debug, info, notice, warning, error, critical)') do |level|
      level = level.downcase
      if LOG_LEVELS.key?(level)
        @min_level = level
      else
        puts "Invalid log level: #{level}"
        puts "Valid levels: #{LOG_LEVELS.keys.join(', ')}"
        exit 1
      end
    end
    
    opts.on('-v', '--version', 'Show version') do
      puts "logviewer #{LogViewer::VERSION}"
      exit
    end
    
    opts.on('-h', '--help', 'Show this help message') do
      puts opts
      exit
    end
  end.parse!(@args)
  
  if @args.empty?
    @input_file = find_most_recent_ndjson_file
    if @input_file.nil?
      puts "Error: No .ndjson files found in current directory"
      puts "Usage: logviewer [options] [ndjson_file]"
      exit 1
    end
    puts "No file specified, using most recent .ndjson file: #{@input_file}"
  else
    @input_file = @args[0]
  end
  
  unless File.exist?(@input_file)
    puts "Error: File not found: #{@input_file}"
    exit 1
  end
end

#run ⇒ Object 



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# File 'lib/logviewer.rb', line 384

def run
  parse_options
  
  puts "Parsing log file: #{@input_file}"
  puts "Minimum log level: #{@min_level}"
  
  logs = parse_logs
  puts "Found #{logs.length} log entries matching criteria"
  
  if logs.empty?
    puts "No log entries found matching the specified criteria."
    exit 0
  end
  
  html_content = generate_html(logs)
  
  # Use /tmp directory for HTML files
  tmp_dir = '/tmp'
  
  # Generate output filename
  base_name = File.basename(@input_file, '.*')
  timestamp = Time.now.strftime('%Y%m%d_%H%M%S')
  output_file = File.join(tmp_dir, "#{base_name}_#{timestamp}.html")
  
  # Write HTML file
  File.write(output_file, html_content)
  puts "HTML file created: #{output_file}"
  
  # Open in browser
  system('open', output_file)
  puts "Opening in browser..."
end

#should_include_log?(level) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/logviewer.rb', line 77

def should_include_log?(level)
  return true unless level
  LOG_LEVELS[level.downcase] >= LOG_LEVELS[@min_level]
end