Method: Cosmos::Microservice#initialize

Defined in:
lib/cosmos/microservices/microservice.rb

#initialize(name, is_plugin: false) ⇒ Microservice

Returns a new instance of Microservice.



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
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
 
# File 'lib/cosmos/microservices/microservice.rb', line 73

def initialize(name, is_plugin: false)
  raise "Microservice must be named" unless name

  @name = name
  split_name = name.split("__")
  raise "Name #{name} doesn't match convention of SCOPE__TYPE__NAME" if split_name.length != 3

  @scope = split_name[0]
  $cosmos_scope = @scope
  Logger.scope = @scope
  @cancel_thread = false
  @metric = Metric.new(microservice: @name, scope: @scope)
  Logger.microservice_name = @name
  Logger.tag = @name + "__cosmos.log"

  # Create temp folder for this microservice
  @temp_dir = Dir.mktmpdir

  # Get microservice configuration from Redis
  @config = MicroserviceModel.get(name: @name, scope: @scope)
  if @config
    @topics = @config['topics']
    @plugin = @config['plugin']
  else
    @config = {}
    @plugin = nil
  end
  Logger.info("Microservice initialized with config:\n#{@config}")
  @topics ||= []

  # Get configuration for any targets from Minio/S3
  @target_names = @config["target_names"]
  @target_names ||= []
  System.setup_targets(@target_names, @temp_dir, scope: @scope) unless is_plugin

  # Use at_exit to shutdown cleanly no matter how we die
  at_exit do
    shutdown()
  end

  @count = 0
  @error = nil
  @custom = nil
  @state = 'INITIALIZED'
  metric_name = "metric_output_duration_seconds"

  if is_plugin
    @work_dir = @config["work_dir"]
    cmd_array = @config["cmd"]

    # Get Microservice files from S3
    temp_dir = Dir.mktmpdir
    rubys3_client = Aws::S3::Client.new
    bucket = "config"

    # Ensure config bucket exists
    begin
      rubys3_client.head_bucket(bucket: bucket)
    rescue Aws::S3::Errors::NotFound
      rubys3_client.create_bucket(bucket: bucket)
    end

    prefix = "#{@scope}/microservices/#{@name}/"
    file_count = 0
    rubys3_client.list_objects(bucket: bucket, prefix: prefix).contents.each do |object|
      response_target = File.join(temp_dir, object.key.split(prefix)[-1])
      FileUtils.mkdir_p(File.dirname(response_target))
      rubys3_client.get_object(bucket: bucket, key: object.key, response_target: response_target)
      file_count += 1
    end

    # Adjust @work_dir to microservice files downloaded if files and a relative path
    if file_count > 0 and @work_dir[0] != '/'
      @work_dir = File.join(temp_dir, @work_dir)
    end

    # Check Syntax on any ruby files
    ruby_filename = nil
    cmd_array.each do |part|
      if /\.rb$/.match?(part)
        ruby_filename = part
        break
      end
    end
    if ruby_filename
      Cosmos.set_working_dir(@work_dir) do
        if File.exist?(ruby_filename)
          # Run ruby syntax so we can log those
          syntax_check, _ = Open3.capture2e("ruby -c #{ruby_filename}")
          if /Syntax OK/.match?(syntax_check)
            Logger.info("Ruby microservice #{@name} file #{ruby_filename} passed syntax check\n", scope: @scope)
          else
            Logger.error("Ruby microservice #{@name} file #{ruby_filename} failed syntax check\n#{syntax_check}", scope: @scope)
          end
        else
          Logger.error("Ruby microservice #{@name} file #{ruby_filename} does not exist", scope: @scope)
        end
      end
    end
  else
    @microservice_sleeper = Sleeper.new
    @microservice_status_period_seconds = 5
    @microservice_status_thread = Thread.new do
      until @cancel_thread
        start = Process.clock_gettime(Process::CLOCK_MONOTONIC)
        @metric.output
        diff = Process.clock_gettime(Process::CLOCK_MONOTONIC) - start # seconds as a float
        @metric.add_sample(name: metric_name, value: diff, labels: {})
        MicroserviceStatusModel.set(as_json(), scope: @scope) unless @cancel_thread
        break if @microservice_sleeper.sleep(@microservice_status_period_seconds)
      end
    rescue Exception => err
      Logger.error "#{@name} status thread died: #{err.formatted}"
      raise err
    end
  end
end