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[chef.git] / cookbooks / planet / files / default / replication-bin / replicate-changesets

diff --git a/cookbooks/planet/files/default/replication-bin/replicate-changesets b/cookbooks/planet/files/default/replication-bin/replicate-changesets
index fac548bd5c2ef6dbdb573ac23e4d461c357d0a94..77dc83312e946354415b09112f1952ebffa550d7 100755 (executable)
--- a/cookbooks/planet/files/default/replication-bin/replicate-changesets
+++ b/cookbooks/planet/files/default/replication-bin/replicate-changesets
@@ -143,7 +143,7 @@ class Replicator
   def initialize(config)
     @config = YAML.safe_load(File.read(config))
     @state = YAML.safe_load(File.read(@config["state_file"]), [Time])
-    @conn = PGconn.connect(@config["db"])
+    @conn = PG::Connection.connect(@config["db"])
     # get current time from the database rather than the current system
     @now = @conn.exec("select now() as now").map { |row| Time.parse(row["now"]) }[0]
   end
@@ -261,8 +261,13 @@ class Replicator
 
   # saves new state (including the changeset dump xml)
   def save!
-    File.open(@config["state_file"], "r") do |fl|
-      fl.flock(File::LOCK_EX)
+    File.open(@config["lock_file"], File::RDWR | File::CREAT, 0o600) do |fl|
+      # take the lock in non-blocking mode. if this process doesn't get the lock
+      # then another will be run from cron shortly. this prevents a whole bunch
+      # of processes queueing on the lock and causing weirdness if/when they
+      # get woken up in a random order.
+      got_lock = fl.flock(File::LOCK_EX | File::LOCK_NB)
+      return unless got_lock
 
       # try and write the files to tmp locations and then
       # move them into place later, to avoid in-progress
@@ -278,7 +283,7 @@ class Replicator
 
         fl.flock(File::LOCK_UN)
       rescue StandardError
-        STDERR.puts("Error! Couldn't update state.")
+        warn "Error! Couldn't update state."
         fl.flock(File::LOCK_UN)
         raise
       end
@@ -290,6 +295,6 @@ begin
   rep = Replicator.new(ARGV[0])
   rep.save!
 rescue StandardError => e
-  STDERR.puts "ERROR: #{e.message}"
+  warn "ERROR: #{e.message}"
   exit 1
 end