X-Git-Url: https://git.plutz.net/?p=confetti;a=blobdiff_plain;f=cgilite%2Fstorage.sh;h=17ea0d051eaf27233f8b5cd96f7396974c7a87f1;hp=7f70e6480d6c89c8a32d3a9ee3fb68a5bfcc35b6;hb=HEAD;hpb=1e5fed890ade56928978f895681129f2214c0778

diff --git a/cgilite/storage.sh b/cgilite/storage.sh
index 7f70e64..5c61df0 100755
--- a/cgilite/storage.sh
+++ b/cgilite/storage.sh
@@ -1,21 +1,18 @@
 #!/bin/sh
 
-# Copyright 2018, 2019 Paul Hänsch
-#
-# This is a file format helper, part of CGIlite.
+# Copyright 2018 - 2021 Paul Hänsch
 # 
-# CGIlite is free software: you can redistribute it and/or modify
-# it under the terms of the GNU Affero General Public License as published by
-# the Free Software Foundation, either version 3 of the License, or
-# (at your option) any later version.
+# Permission to use, copy, modify, and/or distribute this software for any
+# purpose with or without fee is hereby granted, provided that the above
+# copyright notice and this permission notice appear in all copies.
 # 
-# CGIlite is distributed in the hope that it will be useful,
-# but WITHOUT ANY WARRANTY; without even the implied warranty of
-# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-# GNU Affero General Public License for more details.
-# 
-# You should have received a copy of the GNU Affero General Public License
-# along with CGIlite.  If not, see <http://www.gnu.org/licenses/>. 
+# THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+# SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+# IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 
 [ -n "$include_storage" ] && return 0
 include_storage="$0"
@@ -25,62 +22,47 @@ BR='
 '
 
 LOCK(){
-  local lock timeout block
-  lock="${1}.lock"
-  timeout="${2-20}"
-  if [ \! -w "${lock%/*}" ] || [ -e "$lock" -a \! -d "$lock" ]; then
-    printf 'Impossible to get lock: %s\n' "$lock" >&2
+  local lock="${1}.lock" timeout="${2-20}" block
+
+  if [ \! -w "${lock%/*}" ] || [ -e "$lock" -a \! -f "$lock" ]; then
+    debug "Impossible to get lock: $lock"
     return 1
   fi
 
-  while ! mkdir "$lock" 2>&-; do
-    block="$(cat "$lock/pid" || printf 1)"
-    if ! { ps -eo pid |grep -qwF "$block"; }; then
-      printf 'Overriding stale lock: %s\n' "$lock" >&2
-      break
-    fi
-    if [ $timeout -le 0 ]; then
-      printf 'Timeout while trying to get lock: %s\n' "$lock" >&2
-      return 1
+  while [ $timeout -gt 0 ]; do
+    printf '%i\n' $$ >>"${lock}"
+    read block <"$lock"
+    if [ "$block" = $$ ]; then
+      return 0
+    elif ! { ps -eo pid |grep -qwF "$block"; }; then
+      debug "Trying to override stale lock: $lock"
+      if LOCK "$lock" 1; then
+        rm -- "$lock"
+        RELEASE "$lock"
+      fi
+    else
+      timeout=$((timeout - 1))
+      [ $timeout -gt 0 ] && sleep 1
     fi
-    timeout=$((timeout - 1))
-    sleep 1
   done
-  printf '%i\n' $$ >"${lock}/pid"
-  return 0
+
+  debug "Timeout while trying to get lock: $lock"
+  return 1
 }
 
 RELEASE(){
-  local lock
-  lock="${1}.lock"
-  if [ "$(cat "$lock/pid")" = "$$" ]; then
-    rm "$lock/pid"
-    if ! rmdir "$lock"; then
-      printf 'Cannot remove tainted lock: %s\n' "$lock" >&2
-      printf '%i\n' $$ >"${lock}/pid"
-      return 1
-    fi
+  local lock="${1}.lock" block
+
+  read block <"$lock"
+  if [ "$block" = $$ ]; then
+    rm -- "$lock"
     return 0
   else
-    printf 'Refusing to release foreign lock: %s\n' "$lock" >&2
+    debug "Refusing to release foreign lock: $lock"
     return 1
   fi
 }
 
-STRING='
-  s;\\;\\\\;g;
-  s;\n;\\n;g;
-  s;\t;\\t;g;
-  s;\r;\\r;g;
-  s;\+;\\+;g;
-  s; ;+;g;
-'
-
-STRING_OLD(){
-  { [ $# -eq 0 ] && cat || printf %s "$*"; } \
-  | sed -E ':X; $!{N;bX;}'"$STRING"
-}
-
 STRING(){
   local in out=''
   [ $# -gt 0 ] && in="$*" || in="$(cat)"
@@ -93,24 +75,9 @@ STRING(){
     " "*) out="${out}+"; in="${in# }" ;;
     *) out="${out}${in%%[\\${CR}${BR}	+ ]*}"; in="${in#"${in%%[\\${BR}${CR}	+ ]*}"}" ;;
   esac; done
-  printf '%s' "$out"
+  printf '%s' "${out:-\\}"
 }
 
-
-UNSTRING='
-  :UNSTRING_X
-  s;((^|[^\\])(\\\\)*)\\n;\1\n;g;
-  s;((^|[^\\])(\\\\)*)\\t;\1\t;g;
-  s;((^|[^\\])(\\\\)*)\\r;\1\r;g;
-  s;((^|[^\\])(\\\\)*)\+;\1 ;g;
-  tUNSTRING_X;
-  s;((^|[^\\])(\\\\)*)\\\+;\1+;g;
-  s;\\\\;\\;g;
-'
-UNSTRING_OLD(){
-  { [ $# -eq 0 ] && cat || printf %s "$*"; } \
-  | sed -E "$UNSTRING"
-}
 UNSTRING(){
   local in out=''
   [ $# -gt 0 ] && in="$*" || in="$(cat)"
@@ -119,11 +86,118 @@ UNSTRING(){
     \\n*) out="${out}${BR}"; in="${in#\\n}" ;;
     \\r*) out="${out}${CR}"; in="${in#\\r}" ;;
     \\t*) out="${out}	"; in="${in#\\t}" ;;
-    \\+) out="${out}+"; in="${in#\\+}" ;;
+    \\+*) out="${out}+"; in="${in#\\+}" ;;
     +*) out="${out} "; in="${in#+}" ;;
     \\*) in="${in#\\}" ;;
     *) out="${out}${in%%[\\+]*}"; in="${in#"${in%%[\\+]*}"}" ;;
   esac; done
-  printf '%s' "$out"
+  printf '%s\n' "$out"
+}
+
+RXLITERAL(){
+  # sed -E 's;[].*+?^${}()|\[];\\&;g'
+  local in out=''
+  [ $# -gt 0 ] && in="$*" || in="$(cat)"
+  while [ "$in" ]; do case $in in
+    [.+^\$\{\}\(\)\[\]\*\?\|\\]*)
+      out="${out}\\${in%"${in#?}"}"; in="${in#?}";
+      ;;
+    *)out="${out}${in%%[.+^\$\{\}\(\)\[\]\*\?\|\\]*}"
+      in="${in#"${in%%[.+^\$\{\}\(\)\[\]\*\?\|\\]*}"}"
+      ;;
+  esac; done
+  printf '%s\n' "$out"
 }
 
+DBM() {
+  local file="$1" cmd="$2"
+  local k v key value
+  shift 2;
+
+  case "$cmd" in
+    check|contains)
+      key="$(STRING "$1")"
+      while read -r k v; do if [ "$k" = "$key" ]; then
+        return 0
+      fi; done <"$file" 2>&-
+      return 1
+      ;;
+    get)
+      key="$(STRING "$1")"
+      while read -r k v; do if [ "$k" = "$key" ]; then
+        UNSTRING "$v"
+        return 0
+      fi; done <"$file" 2>&-
+      return 1
+      ;;
+    set|store)
+      key="$(STRING "$1")" value="$(STRING "$2")"
+      LOCK "$file" || return 1
+      { while read -r k v; do
+          [ "$k" = "$key" ] || printf '%s\t%s\n' "$k" "$v"
+        done <"$file" 2>&-
+        printf '%s\t%s\n' "$key" "$value"
+      } >"${file}.$$.tmp"
+      mv "${file}.$$.tmp" "${file}"
+      RELEASE "$file"
+      return 0
+      ;;
+    add|insert)
+      k="$1" key="$(STRING "$1")" value="$(STRING "$2")"
+      LOCK "$file" || return 1
+      if DBM "$file" check "$k"; then
+        RELEASE "$file"
+        return 1
+      else
+        printf '%s\t%s\n' "$key" "$value" >>"${file}"
+        RELEASE "$file"
+        return 0
+      fi
+      ;;
+    update|replace)
+      k="$1" key="$(STRING "$1")" value="$(STRING "$2")"
+      LOCK "$file" || return 1
+      if ! DBM "$file" check "$k"; then
+        RELEASE "$file"
+        return 1
+      fi
+      { while read -r k v; do
+          [ "$k" = "$key" ] \
+          && printf '%s\t%s\n' "$key" "$value" \
+          || printf '%s\t%s\n' "$k" "$v"
+        done <"$file" 2>&-
+      } >"${file}.$$.tmp"
+      mv "${file}.$$.tmp" "${file}"
+      RELEASE "$file"
+      return 0
+      ;;
+    append)
+      key="$(STRING "$1")" value="$(STRING "$2")"
+      LOCK "$file" || return 1
+      if ! DBM "$file" check "$1"; then
+        RELEASE "$file"
+        return 1
+      fi
+      { while read -r k v; do
+          [ "$k" = "$key" ] \
+          && printf '%s\t%s\n' "$key" "$v$value" \
+          || printf '%s\t%s\n' "$k" "$v"
+        done <"$file" 2>&-
+      } >"${file}.$$.tmp"
+      mv "${file}.$$.tmp" "${file}"
+      RELEASE "$file"
+      return 0
+      ;;
+    delete|remove)
+      key="$(STRING "$1")"
+      LOCK "$file" || return 1
+      { while read -r k v; do
+          [ "$k" = "$key" ] || printf '%s\t%s\n' "$k" "$v"
+        done <"$file" 2>&-
+      } >"${file}.$$.tmp"
+      mv "${file}.$$.tmp" "${file}"
+      RELEASE "$file"
+      return 0
+      ;;
+  esac
+}