First version of distributed PPSS - does not work yet - untested

ppss.sh

@@ -45,7 +45,7 @@ RUNNING_SIGNAL="$0_is_running"
 GLOBAL_LOCK="PPSS-$RANDOM-$RANDOM"
 PAUSE_SIGNAL="pause.txt"
 ARRAY_POINTER_FILE="array-pointer-$RANDOM-$RANDOM"
-JOB_LOG_DIR="job_log"
+JOB_LOG_DIR="JOB_LOG"
 LOGFILE="ppss-log.txt"
 MAX_DELAY=2
 PERCENT="0"
@@ -53,6 +53,9 @@ PID="$$"
 LISTENER_PID=""
 IFS_BACKUP="$IFS"
 
+SSH_SERVER=""                          # Remote server or 'master'.
+SSH_KEY=""                              # SSH key for ssh account.
+
 showusage () {
     
     echo 
@@ -74,6 +77,11 @@ showusage () {
     echo -e "\t- p [ no of parallel processes ] \tOptional: specifies number of simultaneous processes manually."
     echo -e "\t- j ( enable hyperthreading ) \t\tOptiona: Enable or disable hyperthreading. Enabled by default."
     echo
+    echo "Options for distributed usage:"
+    echo 
+    echo -e "\t- s [ username@server ] \t\tUsername and server domain name or IP-address of 'PPSS server'."
+    echo -e "\t- k [ SSH key file ] \t\tSSH key file used for connection with 'PPSS server'."
+    echo 
     echo -e "Example: encoding some wav files to mp3 using lame:"
     echo 
     echo -e "$0 -c 'lame ' -d /path/to/wavfiles -l logfile -j (wach out for the space in -c)" 
@@ -116,12 +124,12 @@ cleanup () {
         rm $FIFO 
     fi
 
-    if [ -e "$ARRAY_POINTER_FILE" ]
+    if [ -e "$ARRAY_POINTER_FILE" ] && [ -z "$SSH_SERVER" ]
     then
         rm $ARRAY_POINTER_FILE
     fi
 
-    if [ -e "$GLOBAL_LOCK" ]
+    if [ -e "$GLOBAL_LOCK" ] && [ -z "$SSH_SERVER" ]
     then
         rm -rf "$GLOBAL_LOCK"
     fi
@@ -163,7 +171,7 @@ then
 fi
 
 # Process any command-line options that are specified."
-while getopts ":f:c:l:i:vhp:jd:" OPTIONS
+while getopts ":c:d:f:i:jhk:l:p:s:v" OPTIONS
 do
     case $OPTIONS in
         f )
@@ -186,12 +194,6 @@ do
             ;; 
         c ) 
             COMMAND="$OPTARG"
-            if [ -z "$COMMAND" ]
-            then
-                echo "ERROR: command not specified."
-                cleanup
-                exit 1
-            fi
             ;;
 
         h )
@@ -203,6 +205,9 @@ do
         l )
             LOGFILE="$OPTARG"
             ;;
+        k )
+            SSH_KEY="-i $OPTARG"
+            ;;
         p )
             TMP="$OPTARG"
             if [ ! -z "$TMP" ]
@@ -210,6 +215,9 @@ do
                 MAX_NO_OF_RUNNING_JOBS="$TMP"
             fi
             ;;
+        s ) 
+            SSH_SERVER="$OPTARG"
+            ;;
 
         v )
             echo ""
@@ -223,8 +231,21 @@ do
     esac
 done
 
-# Init log file
+# This function makes local and remote operation transparent.
+exec_cmd () { 
 
+    CMD="$1"
+
+    if [ ! -z "$SSH_SERVER" ]
+    then
+        ssh "$SSH_KEY" "$SSH_SERVER" "$CMD"
+    else
+        `"$CMD"`
+    fi
+}
+
+
+# Init all vars
 init_vars () {
 
     if [ -e "$LOGFILE" ]
@@ -242,7 +263,7 @@ init_vars () {
         exit 1
     fi
 
-    echo 0 > "$ARRAY_POINTER_FILE"
+    exec_cmd "echo 0 > $ARRAY_POINTER_FILE"
 
     FIFO=$(pwd)/fifo-$RANDOM-$RANDOM
 
@@ -265,7 +286,7 @@ init_vars () {
         log INFO "Job log directory $JOB_lOG_DIR does not exist. Creating."
         mkdir "$JOB_LOG_DIR"
     else
-        log INFO "Job log directory $JOB_LOG_DIR exists, if it contains logs for items, these items will be skiped."
+        log INFO "Job log directory $JOB_LOG_DIR exists, if it contains logs for items, these items will be skipiped."
     fi
 }
 
@@ -315,11 +336,24 @@ check_status () {
     if [ ! "$ERROR" == "0" ]
     then
         log INFO "$FUNCTION - $MESSAGE"
+        cleanup
         exit 1
     fi
 
 }
 
+test_server () {
+
+    if [ ! -z "$SSH_SERVER" ] 
+    then
+
+        ssh "$SSH_KEY" "$SSH_SERVER" date >> /dev/null 2>&1
+        check_status "$?" "$FUNCNAME" "Server $SSH_SERVER could not be reached."
+    else
+        log DEBUG "No remote server specified, assuming stand-alone mode."
+    fi
+}
+
 get_no_of_cpus () {
 
     # Use hyperthreading or not?
@@ -403,10 +437,12 @@ random_delay () {
     sleep "$NUMBER"
 }
 
+
 global_lock () {
 
-    mkdir $GLOBAL_LOCK > /dev/null 2>&1
+    exec_cmd "mkdir $GLOBAL_LOCK > /dev/null 2>&1"
-    ERROR=$?
+    ERROR="$?"
+
     if [ ! "$ERROR" == "0" ]
     then
         return 1
@@ -433,18 +469,14 @@ get_global_lock () {
 
 release_global_lock () {
 
-    if [ -e "$GLOBAL_LOCK" ]
+    if [ ! -z "$SSH_SERVER" ]
     then
-        rm -rf "$GLOBAL_LOCK"
+        ssh "$SSH_KEY" "$SSH_SERVER" rm -rf "$GLOBAL_LOCK"
-        return 0
     else
-        log ERROR "$FUNCNAME Lock file $GLOBAL_LOCK not present, something is wrong!"
+        rm -rf "$GLOBAL_LOCK"
-        return 1
-        exit
     fi
 }
 
-
 are_jobs_running () {
    
     NUMBER_OF_PROCS=`jobs | wc -l`
@@ -462,7 +494,13 @@ get_all_items () {
 
     if [ -z "$INPUT_FILE" ]
     then
-        ITEMS=`ls -1 $SRC_DIR`
+        if [ ! -z "SSH_SERVER" ] # Are we running stand-alone or as a slave?"
+        then
+            ITEMS=`ssh "$SSH_KEY" "$SSH_SERVER" ls -1 $SRC_DIR`
+            check_status "$FUNCNAME" "Could not list files within remote source directory."
+        else 
+            ITEMS=`ls -1 $SRC_DIR`
+        fi
         IFS="
 "
         for x in $ITEMS
@@ -472,6 +510,12 @@ get_all_items () {
         done
         IFS=$IFS_BACKUP
     else
+        if [ ! -z "SSH_SERVER" ] # Are we running stand-alone or as a slave?"
+        then
+            scp "$SSH_KEY" "$SSH_SERVER:~/$INPUT_FILE" >> /dev/null 2>&!
+            check_status "$FUNCNAME" "Could not copy input file."
+        fi
+
         exec 10<$INPUT_FILE
 
         while read LINE <&10
@@ -506,8 +550,7 @@ get_item () {
     fi
 
     # This variable is used to walk thtough all array items.
-    ARRAY_POINTER=`cat "$ARRAY_POINTER_FILE"`
+    ARRAY_POINTER=`exec_cmd "cat $ARRAY_POINTER_FILE"`
-
 
     # Gives a status update on the current progress..
     PERCENT=`echo "100 * $ARRAY_POINTER / $SIZE_OF_ARRAY" | bc`
@@ -527,12 +570,12 @@ get_item () {
     if [ -z "$ITEM" ]
     then
         ((ARRAY_POINTER++))
-        echo $ARRAY_POINTER > $ARRAY_POINTER_FILE
+        exec_cmd "echo $ARRAY_POINTER > $ARRAY_POINTER_FILE"
         release_global_lock
         get_item
     else
         ((ARRAY_POINTER++))
-        echo $ARRAY_POINTER > $ARRAY_POINTER_FILE
+        exec_cmd "echo $ARRAY_POINTER > $ARRAY_POINTER_FILE"
         release_global_lock
         return 0
     fi
@@ -576,6 +619,10 @@ commando () {
         eval "$EXECME"
     fi
 
+    get_global_lock
+    scp "$SSH_KEY" "$ITEM_LOG_FILE" "$SSH_SERVER:~/$JOB_LOG"
+    release_global_lock
+
     start_single_worker
     return $?
 }
@@ -611,6 +658,7 @@ main () {
     init_vars
     log DEBUG "---------------- START ---------------------"
     log INFO "$SCRIPT_NAME version $SCRIPT_VERSION"
+    test_server
     get_all_items
     listen_for_job "$MAX_NO_OF_RUNNING_JOBS" &
     LISTENER_PID=$!