Class: Fluent::Plugin::LokiOutput

Inherits:
Output
  • Object
show all
Defined in:
lib/fluent/plugin/out_loki.rb

Overview

Subclass of Fluent Plugin Output

Constant Summary collapse

DEFAULT_BUFFER_TYPE = 
'memory'

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#record_accessors ⇒ Object

Returns the value of attribute record_accessors.



32
33
34
 
# File 'lib/fluent/plugin/out_loki.rb', line 32

def record_accessors
  @record_accessors
end

Instance Method Details

#configure(conf) ⇒ Object 



66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
 
# File 'lib/fluent/plugin/out_loki.rb', line 66

def configure(conf)
  compat_parameters_convert(conf, :buffer)
  super
  @record_accessors = {}
  conf.elements.select { |element| element.name == 'label' }.each do |element|
    element.each_pair do |k, v|
      element.key?(k) # to suppress unread configuration warning
      v = k if v.empty?
      @record_accessors[k] = record_accessor_create(v)
    end
  end
  @remove_keys_accessors = []
  @remove_keys.each do |key|
    @remove_keys_accessors.push(record_accessor_create(key))
  end
end

#generic_to_loki(chunk) ⇒ Object 



127
128
129
130
131
132
 
# File 'lib/fluent/plugin/out_loki.rb', line 127

def generic_to_loki(chunk)
  # log.debug("GenericToLoki: converting #{chunk}")
  streams = chunk_to_loki(chunk)
  payload = payload_builder(streams)
  payload
end

#http_opts(uri) ⇒ Object 



87
88
89
90
91
92
 
# File 'lib/fluent/plugin/out_loki.rb', line 87

def http_opts(uri)
  opts = {
    use_ssl: uri.scheme == 'https'
  }
  opts
end

#multi_workers_ready? ⇒ Boolean

Returns:

  • (Boolean) 


83
84
85
 
# File 'lib/fluent/plugin/out_loki.rb', line 83

def multi_workers_ready?
  true
end

#write(chunk) ⇒ Object

flush a chunk to loki



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
 
# File 'lib/fluent/plugin/out_loki.rb', line 95

def write(chunk)
  # streams by label
  payload = generic_to_loki(chunk)
  body = { 'streams' => payload }

  # add ingest path to loki url
  uri = URI.parse(url + '/api/prom/push')

  req = Net::HTTP::Post.new(
    uri.request_uri
  )
  req.add_field('Content-Type', 'application/json')
  req.add_field('X-Scope-OrgID', @tenant) if @tenant
  req.body = Yajl.dump(body)
  req.basic_auth(@username, @password) if @username
  opts = {
    use_ssl: uri.scheme == 'https'
  }
  log.debug "sending #{req.body.length} bytes to loki"
  res = Net::HTTP.start(uri.hostname, uri.port, **opts) { |http| http.request(req) }
  unless res&.is_a?(Net::HTTPSuccess)
    res_summary = if res
                    "#{res.code} #{res.message} #{res.body}"
                  else
                    'res=nil'
                  end
    log.warn "failed to #{req.method} #{uri} (#{res_summary})"
    log.warn Yajl.dump(body)

  end
end