Class: Fluent::Plugin::MonitorAgentInput::MonitorServlet

Inherits:
WEBrick::HTTPServlet::AbstractServlet
  • Object
show all
Defined in:
lib/fluent/plugin/in_monitor_agent.rb

Instance Method Summary collapse

Constructor Details

#initialize(server, agent) ⇒ MonitorServlet

Returns a new instance of MonitorServlet.



41
42
43
 
# File 'lib/fluent/plugin/in_monitor_agent.rb', line 41

def initialize(server, agent)
  @agent = agent
end

Instance Method Details

#build_object(req, res) ⇒ Object 



64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
 
# File 'lib/fluent/plugin/in_monitor_agent.rb', line 64

def build_object(req, res)
  unless req.path_info == ""
    return render_json_error(404, "Not found")
  end

  # parse ?=query string
  if req.query_string
    begin
      qs = CGI.parse(req.query_string)
    rescue
      return render_json_error(400, "Invalid query string")
    end
  else
    qs = Hash.new {|h,k| [] }
  end

  # if ?debug=1 is set, set :with_debug_info for get_monitor_info
  # and :pretty_json for render_json_error
  opts = {with_config: @agent.include_config, with_retry: @agent.include_retry}
  if s = qs['debug'] and s[0]
    opts[:with_debug_info] = true
    opts[:pretty_json] = true
  end

  if ivars = (qs['with_ivars'] || []).first
    opts[:ivars] = ivars.split(',')
  end

  if with_config = get_search_parameter(qs, 'with_config'.freeze)
    opts[:with_config] = Fluent::Config.bool_value(with_config)
  end

  if with_retry = get_search_parameter(qs, 'with_retry'.freeze)
    opts[:with_retry] = Fluent::Config.bool_value(with_retry)
  end

  if tag = get_search_parameter(qs, 'tag'.freeze)
    # ?tag= to search an output plugin by match pattern
    if obj = @agent.plugin_info_by_tag(tag, opts)
      list = [obj]
    else
      list = []
    end

  elsif plugin_id = get_search_parameter(qs, '@id'.freeze)
    # ?@id= to search a plugin by 'id <plugin_id>' config param
    if obj = @agent.plugin_info_by_id(plugin_id, opts)
      list = [obj]
    else
      list = []
    end

  elsif plugin_id = get_search_parameter(qs, 'id'.freeze)
    # Without @ version of ?@id= for backward compatibility
    if obj = @agent.plugin_info_by_id(plugin_id, opts)
      list = [obj]
    else
      list = []
    end

  elsif plugin_type = get_search_parameter(qs, '@type'.freeze)
    # ?@type= to search plugins by 'type <type>' config param
    list = @agent.plugins_info_by_type(plugin_type, opts)

  elsif plugin_type = get_search_parameter(qs, 'type'.freeze)
    # Without @ version of ?@type= for backward compatibility
    list = @agent.plugins_info_by_type(plugin_type, opts)

  else
    # otherwise show all plugins
    list = @agent.plugins_info_all(opts)
  end

  return list, opts
end

#do_GET(req, res) ⇒ Object 



45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
 
# File 'lib/fluent/plugin/in_monitor_agent.rb', line 45

def do_GET(req, res)
  begin
    code, header, body = process(req, res)
  rescue
    code, header, body = render_json_error(500, {
        'message '=> 'Internal Server Error',
        'error' => "#{$!}",
        'backgrace'=> $!.backtrace,
      })
  end

  # set response code, header and body
  res.status = code
  header.each_pair {|k,v|
    res[k] = v
  }
  res.body = body
end

#get_search_parameter(qs, param_name) ⇒ Object 



140
141
142
143
 
# File 'lib/fluent/plugin/in_monitor_agent.rb', line 140

def get_search_parameter(qs, param_name)
  return nil unless qs.has_key?(param_name)
  qs[param_name].first
end

#render_json(obj, opts = {}) ⇒ Object 



145
146
147
 
# File 'lib/fluent/plugin/in_monitor_agent.rb', line 145

def render_json(obj, opts={})
  render_json_error(200, obj, opts)
end

#render_json_error(code, obj, opts = {}) ⇒ Object 



149
150
151
152
153
154
155
156
 
# File 'lib/fluent/plugin/in_monitor_agent.rb', line 149

def render_json_error(code, obj, opts={})
  if opts[:pretty_json]
    js = JSON.pretty_generate(obj)
  else
    js = obj.to_json
  end
  [code, {'Content-Type'=>'application/json'}, js]
end