Class: Prefab::ConfigClient

Inherits:
Object
  • Object
show all
Defined in:
lib/prefab/config_client.rb

Constant Summary collapse

RECONNECT_WAIT = 
5
DEFAULT_CHECKPOINT_FREQ_SEC = 
60
DEFAULT_S3CF_BUCKET = 
'http://d2j4ed6ti5snnd.cloudfront.net'

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(base_client, timeout) ⇒ ConfigClient

Returns a new instance of ConfigClient.



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# File 'lib/prefab/config_client.rb', line 7

def initialize(base_client, timeout)
  @base_client = base_client
  @timeout = timeout
  @initialization_lock = Concurrent::ReadWriteLock.new

  @checkpoint_freq_secs = DEFAULT_CHECKPOINT_FREQ_SEC

  @config_loader = Prefab::ConfigLoader.new(@base_client)
  @config_resolver = Prefab::ConfigResolver.new(@base_client, @config_loader)

  @initialization_lock.acquire_write_lock

  @cancellable_interceptor = Prefab::CancellableInterceptor.new

  @s3_cloud_front = ENV["PREFAB_S3CF_BUCKET"] || DEFAULT_S3CF_BUCKET
  load_checkpoint
  start_checkpointing_thread
end

Class Method Details

.value_to_delta(key, config_value, namespace = nil) ⇒ Object 



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# File 'lib/prefab/config_client.rb', line 63

def self.value_to_delta(key, config_value, namespace = nil)
  Prefab::ConfigDelta.new(key: [namespace, key].compact.join(":"),
                          value: config_value)
end

Instance Method Details

#get(prop) ⇒ Object 



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# File 'lib/prefab/config_client.rb', line 34

def get(prop)
  @initialization_lock.with_read_lock do
    @config_resolver.get(prop)
  end
end

#reset ⇒ Object 



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# File 'lib/prefab/config_client.rb', line 54

def reset
  @base_client.reset!
  @_stub = nil
end

#start_streaming ⇒ Object 



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# File 'lib/prefab/config_client.rb', line 26

def start_streaming
  at_exit do
    @cancellable_interceptor.cancel
  end

  start_api_connection_thread(@config_loader.highwater_mark)
end

#to_s ⇒ Object 



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# File 'lib/prefab/config_client.rb', line 59

def to_s
  @config_resolver.to_s
end

#upsert(key, config_value, namespace = nil, previous_key = nil) ⇒ Object 



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# File 'lib/prefab/config_client.rb', line 40

def upsert(key, config_value, namespace = nil, previous_key = nil)
  raise "Key must not contain ':' set namespaces separately" if key.include? ":"
  raise "Namespace must not contain ':'" if namespace&.include?(":")
  config_delta = Prefab::ConfigClient.value_to_delta(key, config_value, namespace)
  upsert_req = Prefab::UpsertRequest.new(config_delta: config_delta)
  upsert_req.previous_key = previous_key if previous_key&.present?

  @base_client.request Prefab::ConfigService, :upsert, req_options: { timeout: @timeout }, params: upsert_req
  @base_client.stats.increment("prefab.config.upsert")
  @config_loader.set(config_delta)
  @config_loader.rm(previous_key) if previous_key&.present?
  @config_resolver.update
end