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[chef.git] / cookbooks / tile / templates / default / replicate.erb

diff --git a/cookbooks/tile/templates/default/replicate.erb b/cookbooks/tile/templates/default/replicate.erb
index f996afb04e4248637422f38d675796c5b600bf1b..24e41819846c13fccdb89bce29739e45164cf8a1 100644 (file)
--- a/cookbooks/tile/templates/default/replicate.erb
+++ b/cookbooks/tile/templates/default/replicate.erb
@@ -6,12 +6,20 @@
 # Setting to midnight ensures we get conistent data after first run
 # osmosis --read-replication-interval-init
 
+# Define exit handler
+function onexit {
+    [ -f state-prev.txt ] && mv state-prev.txt state.txt
+}
+
 # Send output to the log
 exec > /var/log/tile/replicate.log 2>&1
 
 # Change to the replication state directory
 cd /var/lib/replicate
 
+# Install exit handler
+trap onexit EXIT
+
 # Read in initial state
 . state.txt
 
@@ -21,6 +29,9 @@ do
     # Work out the name of the next file
     file="changes-${sequenceNumber}.osm.gz"
 
+    # Save state file so we can rollback if an error occurs
+    cp state.txt state-prev.txt
+
     # Fetch the next set of changes
     osmosis --read-replication-interval --simc --write-xml-change file="${file}" compressionMethod="gzip"
 
@@ -28,28 +39,31 @@ do
     if [ $? -eq 0 ]
     then
         # Enable exit on error
-       set -e
+        set -e
 
         # Remember the previous sequence number
-       prevSequenceNumber=$sequenceNumber
+        prevSequenceNumber=$sequenceNumber
 
         # Read in new state
-       . state.txt
+        . state.txt
 
         # Did we get any new data?
-       if [ "${sequenceNumber}" == "${prevSequenceNumber}" ]
+        if [ "${sequenceNumber}" == "${prevSequenceNumber}" ]
         then
             # Log the lack of data
-           echo "No new data available. Sleeping..."
+            echo "No new data available. Sleeping..."
 
-           # Remove file, it will just be an empty changeset
-           rm ${file}
+            # Remove file, it will just be an empty changeset
+            rm ${file}
+
+            # No need to rollback now
+            rm state-prev.txt
 
             # Sleep for a short while
-           sleep 30
-       else
+            sleep 30
+        else
             # Log the new data
-           echo "Fetched new data from ${prevSequenceNumber} to ${sequenceNumber} into ${file}"
+            echo "Fetched new data from ${prevSequenceNumber} to ${sequenceNumber} into ${file}"
 
             # Apply the changes to the database
 <% if node[:tile][:node_file] -%>
@@ -58,20 +72,23 @@ do
             osm2pgsql --slim --append ${file}
 <% end -%>
 
+            # No need to rollback now
+            rm state-prev.txt
+
             # Expire tiles which are touched by the changes
-            /usr/local/bin/expire-tiles ${file} > /dev/null 2>&1 &
-       fi
+            sudo -u www-data /usr/local/bin/expire-tiles ${file} > /dev/null 2>&1 &
+        fi
 
         # Delete old downloads
-       find . -name 'changes-*.gz' -mmin +300 -exec rm -f {} \;
+        find . -name 'changes-*.gz' -mmin +300 -exec rm -f {} \;
 
         # Disable exit on error
         set +e
     else
         # Log our failure to fetch changes
-       echo "Failed to fetch changes - waiting a few minutes before retry"
+        echo "Failed to fetch changes - waiting a few minutes before retry"
 
         # Wait five minutes and have another go
-       sleep 300
+        sleep 300
     fi
 done