Class: Blitz::Command::Couch

Inherits:
Blitz::Command show all
Defined in:
lib/blitz/command/couch.rb

Overview

:nodoc:

Constant Summary

Constants inherited from Blitz::Command

Api

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from Utils

#shift

Methods included from Helper

#ask, #error, #msg

Constructor Details

#initialize ⇒ Couch

Returns a new instance of Couch.



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# File 'lib/blitz/command/couch.rb', line 8

def initialize
    @urls = []
end

Instance Attribute Details

#urls ⇒ Object (readonly)

Returns the value of attribute urls.



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# File 'lib/blitz/command/couch.rb', line 6

def urls
  @urls
end

Instance Method Details

#analyze_design(db, design) ⇒ Object 



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# File 'lib/blitz/command/couch.rb', line 45

def analyze_design db, design
    _, dname = design['_id'].split('/', 2)
    views = design['views']
    views.each_pair do |vname, view|
        analyze_view db, dname, vname, view['reduce']
    end
end

#analyze_view(db, design, view, reduce) ⇒ Object 



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# File 'lib/blitz/command/couch.rb', line 53

def analyze_view db, design, view, reduce
    msg "  analyzing #{design}/#{view}..."

    opts = {}
    opts[:group] = true if reduce
    first = db.view "#{design}/#{view}", opts.merge(:limit => 1)
    last = db.view "#{design}/#{view}", opts.merge(:limit => 1, :descending => true)

    return if first['rows'].empty?

    first_row = first['rows'][0]
    first_key = first_row['key']
    last_row = last['rows'][0]
    last_key = last_row['key']

    # Randomize the limit so it's anywhere from 1 to 10 docs maximum
    variables = { :l => 'number[1,10]' }
    query = { :limit => '#{l}' }
    if reduce
        query.merge! :group => true
    else
        variables.merge! :id => '[true,false]'
        query.merge! :include_docs => '#{id}'
    end

    case first_key
    when Array
        # If the key is an array and this view is reducing, randomize the 
        # group level to have the query server work harder
        if reduce
            variables[:gl] = 'number[1,5]'
            query[:group_level] = '#{gl}'
        end
    when Integer
        # Randomize start/end keys, but within the valid range
        variables[:sk] = "number[#{first_key},#{last_key}]"
        variables[:ek] = "number[#{first_key},#{last_key}]"
        query[:startkey] = '#{sk}'
        query[:endkey] = '#{ek}'
    when String
        # Randomize start/end keys, but within the valid range
        variables[:sk] = "alpha[4,12]"
        variables[:ek] = "alpha[4,12]"
        query[:startkey] = "%22#{first_key[0,2]}\#{sk}%22"
        query[:endkey] = "%22#{last_key[0,2]}z\#{ek}%22"
    when TrueClass, FalseClass
        variables[:sk] = "[true,false]"
        variables[:ek] = "[true,false,false,true]"
        query[:startkey] = '#{sk}'
        query[:endkey] = '#{ek}'
    # TODO: Handle the case when the key is a Hash
    end

    vs = variables.to_a.map do |k, v|
        if v =~ /\s/
            "-v:#{k} '#{v}'"
        else
            "-v:#{k} #{v}"
        end
    end.join(' ')
    qs = query.to_a.map { |k, v| "#{k}=#{v}" }.join('&')

    # Generate blitz query URL's with all sorts of randomization
    @urls << {
        :reduce => reduce ? true : false,
        :design => design,
        :view => view,
        :url => "#{vs} #{db.to_s}/_design/#{design}/_view/#{view}?#{qs}"
    }
end

#cmd_fuzz(argv) ⇒ Object 



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# File 'lib/blitz/command/couch.rb', line 12

def cmd_fuzz argv
    assert argv.size != 0, "need a CouchDB URL (like http://localhost:5984)"

    url = argv.shift
    database = argv.shift

    uri = URI.parse url rescue nil
    assert_not_nil uri, "Can't parse #{url} - Is it valid?"

    couch = CouchRest.new(uri)
    couch.databases.reject { |n| n[0,1] == '_' }.each do |name|
        next if database and database != name
        msg "-------------- processing #{name}... ----------------------"
        db = couch.database(name)
        designs = db.documents :startkey => "_design", :endkey => "_design0", :include_docs => true
        designs['rows'].each do |row|
            design = row['doc']

            # Ignore design documents that don't have views
            next unless design['views']
            analyze_design db, design
        end

        if urls.empty?
            error "Nothing interesting found. Sorry."
            return
        end
        
        output_urls db
        urls.clear
    end
end

#output_urls(db) ⇒ Object 



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# File 'lib/blitz/command/couch.rb', line 124

def output_urls db
    puts
    msg "Here are full parameterized blitz URL's for each view. Simply copy "
    msg "paste these into the blitz bar @ http://blitz.io to generate load "
    msg "on your couch."
    puts
    puts urls.map { |u| u[:url] }.join("\n\n")
    puts
    puts
end