From ac2d7693e02a11d80879ccd80dc33a4f213295e6 Mon Sep 17 00:00:00 2001
From: Feng Pan <fpan@redhat.com>
Date: Sun, 19 Feb 2017 15:14:40 -0500
Subject: Add support for inline config changes

This patch changes VPP configuration from file template to inline
change directly. This prevents issue with overwriting existing
VPP config.

Change-Id: I4133be8ebe689d9288e3a8e64cca43afd7e42e64
Signed-off-by: Feng Pan <fpan@redhat.com>
---
 lib/puppet/provider/vpp_config/vpp.rb | 118 ++++++++++++++++++++++++++++++++++
 1 file changed, 118 insertions(+)
 create mode 100644 lib/puppet/provider/vpp_config/vpp.rb

(limited to 'lib/puppet/provider/vpp_config/vpp.rb')

diff --git a/lib/puppet/provider/vpp_config/vpp.rb b/lib/puppet/provider/vpp_config/vpp.rb
new file mode 100644
index 0000000..2574d4c
--- /dev/null
+++ b/lib/puppet/provider/vpp_config/vpp.rb
@@ -0,0 +1,118 @@
+Puppet::Type.type(:vpp_config).provide(:vpp) do
+
+  def file_path
+    '/etc/vpp/startup.conf'
+  end
+
+  def initialize(value={})
+    super(value)
+    settings_arr = @resource[:setting].split('/')
+    @section = settings_arr[0]
+    @real_setting = settings_arr[1]
+    @dev = settings_arr[2]
+
+    if @section.nil? || @real_setting.nil?
+      fail("#{@resource[:setting]} is not a valid setting string")
+    end
+
+    if @dev
+      @search_regex = /^\s*dev\s+#{@dev}\s*({[^}]*})?/
+    else
+      @search_regex = /^\s*#{@real_setting}\s+(\S+)?/
+    end
+
+  end
+
+  def write_config(config)
+    if File.read(file_path) != config
+      File.open(file_path, 'w') do |fh|
+        fh.puts(config)
+      end
+    end
+  end
+
+  def get_sections
+    vpp_config = File.read(file_path)
+    scanner = StringScanner.new vpp_config
+
+    #first skip to section beginning
+    string = scanner.scan_until(/#{@section}\s*{\s*/)
+
+    #if we can't find the section, add it to the end
+    return vpp_config+"\n#{@section} {", "", "}\n" unless string
+
+    level = 1
+    before = string
+    after = ''
+    section_config = ''
+
+    while current_char = scanner.getch
+      case current_char
+      when '{'
+        level += 1
+        section_config << current_char
+      when '}'
+        level -= 1
+        if level == 0
+          after = current_char + scanner.post_match
+          break
+        else
+          section_config << current_char
+        end
+      else
+        section_config << current_char
+      end
+    end
+
+    fail("Failed to parse VPP config: #{vpp_config}") unless level == 0
+    return before, section_config, after
+  end
+
+  def add_setting(value)
+    before, section_config, after = get_sections
+
+    if @dev
+      if value.to_s.empty?
+        setting_string = "#{@real_setting} #{@dev}"
+      else
+        setting_string = "#{@real_setting} #{@dev} {#{value}}"
+      end
+    else
+      setting_string = "#{@real_setting} #{value}"
+    end
+
+    if section_config =~ @search_regex
+      section_config.sub!(@search_regex, "  #{setting_string}")
+    else
+      section_config.rstrip!
+      section_config << "\n  #{setting_string}\n"
+    end
+
+    write_config(before+section_config+after)
+  end
+
+  def create
+    add_setting(@resource[:value])
+  end
+
+  def destroy
+    before, section_config, after = get_sections
+    section_config.sub!(@search_regex, "")
+    write_config(before+section_config+after)
+  end
+
+  def exists?
+    before, section_config, after = get_sections
+    @search_regex.match(section_config)
+  end
+
+  def value
+    before, section_config, after = get_sections
+    @search_regex.match(section_config) { |m| m[1] }
+  end
+
+  def value=(value)
+    add_setting(value)
+  end
+
+end
-- 
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