From c3e9f5ba6fc10397f55941f36da29808a105d248 Mon Sep 17 00:00:00 2001
From: Eric Wong <normalperson@yhbt.net>
Date: Wed, 7 Apr 2010 17:07:42 -0700
Subject: initial

---
 lib/raindrops/linux.rb | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)
 create mode 100644 lib/raindrops/linux.rb

(limited to 'lib/raindrops/linux.rb')

diff --git a/lib/raindrops/linux.rb b/lib/raindrops/linux.rb
new file mode 100644
index 0000000..6dff73f
--- /dev/null
+++ b/lib/raindrops/linux.rb
@@ -0,0 +1,55 @@
+# -*- encoding: binary -*-
+class Raindrops
+module Linux
+
+  # The standard proc path for active UNIX domain sockets, feel free to call
+  # String#replace on this if your /proc is mounted in a non-standard location
+  # for whatever reason
+  PROC_NET_UNIX = "/proc/net/unix"
+
+  # Get ListenStats from an array of +paths+
+  #
+  # Socket state mapping from integer => symbol, based on socket_state
+  # enum from include/linux/net.h in the Linux kernel:
+  #     typedef enum {
+  #             SS_FREE = 0,              /* not allocated                */
+  #             SS_UNCONNECTED,           /* unconnected to any socket    */
+  #             SS_CONNECTING,            /* in process of connecting     */
+  #             SS_CONNECTED,             /* connected to socket          */
+  #             SS_DISCONNECTING          /* in process of disconnecting  */
+  #     } socket_state;
+  # * SS_CONNECTING maps to ListenStats#active
+  # * SS_CONNECTED maps to ListenStats#queued
+  #
+  # This method may be significantly slower than its tcp_listener_stats
+  # counterpart due to the latter being able to use inet_diag via netlink.
+  # This parses /proc/net/unix as there is no other (known) way
+  # to expose Unix domain socket statistics over netlink.
+  def unix_listener_stats(paths)
+    rv = Hash.new { |h,k| h[k.freeze] = ListenStats.new(0, 0) }
+    paths = paths.map do |path|
+      path = path.dup
+      path.force_encoding(Encoding::BINARY) if defined?(Encoding)
+      rv[path]
+      Regexp.escape(path)
+    end
+    paths = / 00000000 \d+ (\d+)\s+\d+ (#{paths.join('|')})$/n
+
+    # no point in pread since we can't stat for size on this file
+    File.open(PROC_NET_UNIX, "rb") do |fp|
+      fp.read.scan(paths).each do |s|
+        path = s.last
+        case s.first.to_i
+        when 2 then rv[path].queued += 1
+        when 3 then rv[path].active += 1
+        end
+      end
+    end
+
+    rv
+  end
+
+  module_function :unix_listener_stats
+
+end # Linux
+end # Raindrops
-- 
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