Class: E2Phokz::App

Inherits:
Object
  • Object
show all
Defined in:
lib/e2phokz.rb

Constant Summary collapse

BUFFER_SIZE =

megabytes

16

Instance Method Summary collapse

Constructor Details

#initialize(options) ⇒ App

Returns a new instance of App.



19
20
21
 
# File 'lib/e2phokz.rb', line 19

def initialize(options)
   @options = options
end

Instance Method Details

#buffercopy(infile, outfile, cls, s, e) ⇒ Object 



23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
 
# File 'lib/e2phokz.rb', line 23

def buffercopy(infile,outfile,cls,s,e)

  bs = @fsinfo['block_size'].to_i
  num = (e-s+1)*bs
  warn "#{cls} from block #{s} to #{e} number of bytes #{num}" unless @debug.nil?

  maxbuf = BUFFER_SIZE*1024*1024 #16M
  rest = num
  count = 0

  infile.seek(s*bs,IO::SEEK_SET)

  while rest > 0
    count = rest > maxbuf ? maxbuf : rest
    rest = rest - count

    a = Time.now.to_f
    outfile.write(infile.read(count))
    b = Time.now.to_f
    warn "#{count} bytes read in #{b-a} sec, #{count/(b-a)} bytes/s" unless @debug.nil?
    eta_continuous count
    GC.start
  end
end

#close_files ⇒ Object 



233
234
235
236
237
 
# File 'lib/e2phokz.rb', line 233

def close_files
  @file.close
  @gzip.close
  @devzero.close
end

#connect_stomp ⇒ Object 



99
100
101
102
103
104
105
106
107
108
109
110
111
 
# File 'lib/e2phokz.rb', line 99

def connect_stomp
  begin
    config=YAML::load(File.open(CONFIG_FILENAME))['stomp']
  rescue
    warn "Error: cannot load or parse stomp config #{CONFIG_FILENAME}" && exit
  end

  begin
    @stomp_client = Stomp::Client.new(config['user'], config['password'], config['server'], config['port'])
  rescue
    warn "Error: cannot connect to stomp server #{config['server']}" && exit
  end
end

#eta_continuous(count) ⇒ Object 



63
64
65
66
67
68
69
70
71
72
73
74
 
# File 'lib/e2phokz.rb', line 63

def eta_continuous count
  elapsed=Time.now.to_f-@time_start
  @written = @written + count
  to_be_written = @fsinfo['block_count'].to_i * @fsinfo['block_size'].to_i
  progress = (1000.0*@written/to_be_written)/10
  # weighted average
  eta = elapsed/progress*100 - elapsed
  new_eta = (progress*eta + (100-progress)*@initial_eta)/100
  #TODO support for non-gzipped ETA calculation
  progress_stomp [sprintf("%.2f",progress)+'%',new_eta]
  progress_bar [progress.to_s+'%',new_eta]
end

#eta_initial ⇒ Object 



76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
 
# File 'lib/e2phokz.rb', line 76

def eta_initial
  #TODO support for non-gzipped ETA calculation

  #constants
  gzip_free=0.02
  gzip_data=0.09

  bs=@fsinfo['block_size'].to_i
  @megs_used=(@fsinfo['block_count'].to_i-@fsinfo['free_blocks'].to_i)*bs/1024/1024
  @megs_free=(@fsinfo['free_blocks'].to_i*bs/1024/1024)
  eta = @megs_used*gzip_data+@megs_free*gzip_free
  @written = 0
  @initial_eta = eta
  progress_stomp ['0%',eta]
  progress_bar ['0%',eta]
end

#parse_args ⇒ Object 



113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
 
# File 'lib/e2phokz.rb', line 113

def parse_args
  @time_start=Time.now.to_f

  if @options.length < 2 or @options.length > 3
    puts File.open(__FILE__).read.split("\n").collect{|l| l.gsub('# ','') unless l.match(/^# /).nil?}.compact.join("\n")
    exit
  end
  if @options.length == 3
    @channel_name = @options.last
    connect_stomp
  end

  #test for presence of in file || device
  begin
    warn "Warning: input file #{@options.first} is not a block device" unless File::Stat.new(@options.first).blockdev?
    @file=File.open(@options.first,'rb')
  rescue
    warn "Error: infile #{@options.first} cannot be open." && exit
  end

  #test for presence of out file
  begin
    if File::Stat.new(@options[1]).blockdev?
      warn "Error: I will not overwrite block device #{@options[1]}"
    else
      warn "Error: I will not overwrite output file #{@options[1]}"
    end
    exit
  rescue
    warn "OK"
  end

  if @options[1]=='-'
    # writing to stdout, no compression
    @gzip=IO.new(1,"w")
  else
    begin
      if @options[1].split('.').last == 'gz'
        #compression required
        @gzip=Zlib::GzipWriter.open(@options[1])
      else
        @gzip=File.open(@options[1],'wb')
      end
    rescue
      warn "Error: cannot open output file #{@options[1]} for writing."
    end
  end

  @devzero=File.open("/dev/zero",'rb')

end

#parse_dumpe2fs ⇒ Object 



165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
 
# File 'lib/e2phokz.rb', line 165

def parse_dumpe2fs
  begin
    dump = File.popen("dumpe2fs #{@options.first}",'r').read.split("\n")
  rescue
    warn "Error: cannot execute dump2efs" && exit
  end

  header = 1
  @fsinfo={}
  group_number=0
  from=0
  to=0
  dump.each do |row|
    if row==''    # header ends with empty row
      header = 0
      #we have processed heade, so we can count ETA now
      eta_initial
      next
    end

    if header == 1
      #we are processing header to @fsinfo hash
      fields = row.split(':')
      varname = fields.shift.split(' ').join('_').downcase
      value = fields.join(':').strip
      @fsinfo.merge!({varname => value})
    else
      #we are processing group info
      fields = row.split(' ')
      if fields.first=='Group'
        group_number = fields[1].to_i
        from = fields[3].split('-').first.to_i
        to = fields[3].split('-').last.to_i
        warn "Processing group #{group_number} #{from} #{to}" unless @debug.nil?
      else
        # we are only interested in free blocks info as of now
        fields = row.split(':')
        name = fields.first.strip
        if name == 'Free blocks' then
          ranges = fields.last.strip.split(', ')
          if ranges.empty?
            #copy whole group
            warn "Full copy of group #{group_number}" unless @debug.nil?
            buffercopy(@file,@gzip,'copy', from,to)
          else
            #copy only non-free blocks
            warn "Partial copy of group #{group_number}" unless @debug.nil?
            pointer = from
            ranges.each do |range|
              range_start=range.split('-').first.to_i
              range_end=range.split('-').last.to_i
              buffercopy(@file,@gzip,'copy',pointer,range_start-1)
              buffercopy(@devzero,@gzip,'zero',range_start,range_end)
              pointer=range_end+1
            end
            if to > pointer
              warn "Remaining blocks from last free to end of group #{group_number}" unless @debug.nil?
              buffercopy(@file,@gzip,'copy',pointer,to)
            end
          end
        end

      end
    end
  end

end

#progress_bar(progress) ⇒ Object 



48
49
50
51
52
53
54
55
56
57
58
59
60
61
 
# File 'lib/e2phokz.rb', line 48

def progress_bar progress
  t = progress.last
  i = progress.first.split('%').first.to_f

  h=(t/3600).to_i
  m=((t%3600)/60).to_i
  s=((t%60)*10).to_i/10.0
  bars=(40*i/100).ceil
  bbars=(1..bars).collect {'#'}.join
  spaces=40-bars
  bspaces=(1..spaces).collect {' '}.join
  sep = @debug.nil? ? "\r" : "\n"
  $stderr.write "ETA #{sprintf('%02d:%02d:%02.1f',h,m,s)} #{sprintf('%3d',i)}% [#{bbars}#{bspaces}] #{sep}"
end

#progress_stomp(progress) ⇒ Object 



93
94
95
96
97
 
# File 'lib/e2phokz.rb', line 93

def progress_stomp progress
  unless @stomp_client.nil?
    @stomp_client.publish(@channel_name,progress.join(';'))
  end
end

#run! ⇒ Object 



240
241
242
243
244
245
 
# File 'lib/e2phokz.rb', line 240

def run!
  parse_args
  parse_dumpe2fs
  close_files
  warn "\n"
end