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annotate bin/ix.sh @ 103:d354e29c91a5

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never should have added
author Henry S. Thompson <ht@inf.ed.ac.uk>
date Mon, 19 Apr 2021 18:09:25 +0000
parents 0332076afc37
children baf56ff538f8
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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Henry S. Thompson <ht@inf.ed.ac.uk>
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1 #!/usr/bin/bash
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2 # Extract records from warc files given length, offset and file triples
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3 # from stdin or as command line args
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4 # Usage [-d] [-w] [-h] [-b] [-e cmd] [ -x | length offset path ]
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5 # -d Debug output
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6 # -w WARC headers
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7 # -h HTTP headers
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8 # -b HTTP body
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9 # No switch defaults to whole record
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10 # -x take lines of from a cdx index file as input, extract triples
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11 # -e pipes each result thru cmd
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12 if [ "$1" = "-d" ]
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13 then
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14 d=1
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15 rm /tmp/ix_dd_log.txt /tmp/ix_triples.tsv
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16 shift
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17 fi
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18 if [ "$1" = "-w" ]
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19 then
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20 shift
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21 p=1
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22 w=1
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23 fi
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24 if [ "$1" = "-h" ]
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25 then
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26 shift
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27 p=1
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28 h=1
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29 fi
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30 if [ "$1" = "-b" ]
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31 then
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32 shift
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33 p=1
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34 b=1
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35 fi
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36 e="cat"
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37 if [ "$1" = "-e" ]
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38 then
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39 shift
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40 e="$1"
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41 shift
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42 fi
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43 if [ "$1" = "-x" ]
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44 then
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45 # get triples from index lines
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46 egrep -ao 'length": "[0-9]*", "offset": "[0-9]*".*\.gz'| \
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47 sed 's/[a-z]*": "//g;s/", "/\t/g;s/\(crawl-data\|segments\|warc\)\///g' |\
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48 if [ "$d" ] ; then tee -a /tmp/ix_triples.tsv ; else cat ; fi
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49 elif [ "$1" ]
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50 then
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51 printf "%s\t%s\t%s\n" "$1" "$2" "$3"
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52 else
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53 cat
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54 fi | \
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55 while { IFS=$'\t' read l o f; }
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56 do
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57 if [ -z "$d" ]
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58 then
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59 dd if="$f" of=/dev/stdout skip=$o count=$l \
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60 iflag=skip_bytes,count_bytes status=none
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61 else
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62 echo dd if="$f" of=/dev/stdout skip=$o count=$l \
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63 iflag=skip_bytes,count_bytes >> /tmp/ix_dd_log.txt
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64 dd if="$f" of=/dev/stdout skip=$o count=$l \
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65 iflag=skip_bytes,count_bytes 2>> /tmp/ix_dd_log.txt
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66 fi | \
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67 { unpigz -dp 1 -c || { printf "dd failure?: %s %s %s\n" $f $o $l 1>&2 ; continue ; } } |\
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68 { s="w"
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69 if [ "$p" ]
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70 then
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71 shopt -qs extglob # for %%*(...)
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72 while read -r L
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73 do
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74 if [ "$s" = "w" ]
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75 then
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76 # WARC header
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77 case "$L" in
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78 Content-Length:\ *) wl=${L##*: }
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79 wl=${wl%%*([ [:space:]])}
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80 ;;
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81 WARC-Truncated:\ *) # echo $n $L
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82 tr=${L##*: }
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83 tr=${tr%%*([ [:space:]])}
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84 tr=${tr:-EMPTY}
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85 ;;
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86 ) s="h"
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87 if [ -z "$h$b" ]
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88 then
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89 exit 0
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90 fi
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91 if [ "$w" ]
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92 then
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93 echo
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94 fi
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95 continue;;
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96 esac
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97 if [ "$w" ]
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98 then
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99 printf "%s\n" "${L%% }"
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100 fi
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101 continue
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102 fi
90
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103 if [ "$s" = "h" ]
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104 then
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105 # HTTP header
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106 wl=$((wl - ( ${#L} + 1 )))
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107 case "$L" in
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108 Content-Length:\ *) bl=${L##*: }
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109 bl=${bl%%*([ [:space:]])}
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110 ;;
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111 ) s="b" ; n=0
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112 if [ -z "$b" ]
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113 then
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114 exit 0
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115 fi
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116 if [ "$h" ]
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117 then
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118 echo
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119 fi
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120 if [ "$bl" ]; then
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121 if [ $bl -ne $wl ]; then
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122 echo length mismatch: $l $o $f here: $wl given: $bl trunc: $tr 1>&2
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123 fi
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124 fi
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125 continue ;;
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126 esac
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127 if [ "$h" ]
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128 then
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129 printf "%s\n" "${L%% }"
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130 fi
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131 continue
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132 else
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133 # HTTP body
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134 if [ "$b" ]
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135 then
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136 #printf "%s\n" "$bl" 1>&2
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137 head -c "${bl-$wl}"
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138 exit 0
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139 else
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140 break
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141 fi
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142 fi
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143 done
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144 else
90
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145 # No flags,the whole thing
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146 cat
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147 fi
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148 } | $e
92
d56465d5c51f accepts index lines, less line-at-a-time
Henry S. Thompson <ht@inf.ed.ac.uk>
parents: 91
diff changeset
149 done