Implement SIGHUP for logs reopening

docs/signals.md

@@ -38,5 +38,6 @@ Puma cluster responds to these signals:
 - `TERM` send `TERM` to worker. Worker will attempt to finish then exit.
 - `USR2` restart workers
 - `USR1` restart workers in phases, a rolling restart.
+- `HUP`  reopen log files defined in stdout_redirect configuration parameter
 - `INT` equivalent of sending Ctrl-C to cluster. Will attempt to finish then exit.
 - `CHLD`

lib/puma/cli.rb

@@ -537,6 +537,14 @@ module Puma
         log "*** SIGTERM not implemented, signal based gracefully stopping unavailable!"
       end
 
+      begin
+        Signal.trap "SIGHUP" do
+          redirect_io
+        end
+      rescue Exception
+        log "*** SIGHUP not implemented, signal based logs reopening unavailable!"
+      end
+
       if jruby?
         Signal.trap("INT") do
           @status = :exit
@@ -564,6 +572,10 @@ module Puma
       true
     end
 
+    def redirect_io
+      @runner.redirect_io
+    end
+
     def stats
       @runner.stats
     end

lib/puma/cluster.rb

@@ -36,6 +36,12 @@ module Puma
       end
     end
 
+    def redirect_io
+      super
+
+      @workers.each { |x| x.hup }
+    end
+
     class Worker
       def initialize(idx, pid, phase)
         @index = idx
@@ -82,6 +88,11 @@ module Puma
         Process.kill "KILL", @pid
       rescue Errno::ESRCH
       end
+
+      def hup
+        Process.kill "HUP", @pid
+      rescue Errno::ESRCH
+      end
     end
 
     def spawn_workers
@@ -104,9 +115,9 @@ module Puma
     end
 
     def next_worker_index
-      all_positions =  0...@options[:workers] 
+      all_positions =  0...@options[:workers]
       occupied_positions = @workers.map { |w| w.index }
-      available_positions = all_positions.to_a - occupied_positions 
+      available_positions = all_positions.to_a - occupied_positions
       available_positions.first
     end
 
@@ -172,6 +183,7 @@ module Puma
       $0 = "puma: cluster worker #{index}: #{master}"
       Signal.trap "SIGINT", "IGNORE"
 
+      @workers = []
       @master_read.close
       @suicide_pipe.close