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client.rb
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client.rb
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require 'diego/bbs/bbs'
require 'diego/errors'
require 'diego/routes'
require 'http/httpclient'
module Diego
class Client
def initialize(url:, ca_cert_file:, client_cert_file:, client_key_file:,
connect_timeout:, send_timeout:, receive_timeout:)
ENV['PB_IGNORE_DEPRECATIONS'] ||= 'true'
@logger = Steno.logger('cc.diego.client')
@client = build_client(
url,
ca_cert_file,
client_cert_file,
client_key_file,
connect_timeout,
send_timeout,
receive_timeout
)
end
def ping
response = with_request_error_handling do
client.post(Routes::PING)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::PingResponse)
end
def upsert_domain(domain:, ttl:)
request = protobuf_encode!({ domain: domain, ttl: ttl.to_i }, Bbs::Models::UpsertDomainRequest)
response = with_request_error_handling do
client.post(Routes::UPSERT_DOMAIN, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::UpsertDomainResponse)
end
def desire_task(task_definition:, domain:, task_guid:)
request = protobuf_encode!({ task_definition:, domain:, task_guid: }, Bbs::Models::DesireTaskRequest)
response = with_request_error_handling do
client.post(Routes::DESIRE_TASK, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::TaskLifecycleResponse)
end
def task_by_guid(task_guid)
request = protobuf_encode!({ task_guid: }, Bbs::Models::TaskByGuidRequest)
response = with_request_error_handling do
client.post(Routes::TASK_BY_GUID, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::TaskResponse)
end
def tasks(domain: '', cell_id: '')
request = protobuf_encode!({ domain:, cell_id: }, Bbs::Models::TasksRequest)
response = with_request_error_handling do
client.post(Routes::LIST_TASKS, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::TasksResponse)
end
def cancel_task(task_guid)
request = protobuf_encode!({ task_guid: }, Bbs::Models::TaskGuidRequest)
response = with_request_error_handling do
client.post(Routes::CANCEL_TASK, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::TaskLifecycleResponse)
end
def desire_lrp(lrp)
request = protobuf_encode!({ desired_lrp: lrp }, Bbs::Models::DesireLRPRequest)
response = with_request_error_handling do
client.post(Routes::DESIRE_LRP, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::DesiredLRPLifecycleResponse)
end
def desired_lrp_by_process_guid(process_guid)
request = protobuf_encode!({ process_guid: }, Bbs::Models::DesiredLRPByProcessGuidRequest)
response = with_request_error_handling do
client.post(Routes::DESIRED_LRP_BY_PROCESS_GUID, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::DesiredLRPResponse)
end
def update_desired_lrp(process_guid, lrp_update)
request = protobuf_encode!({ process_guid: process_guid, update: lrp_update }, Bbs::Models::UpdateDesiredLRPRequest)
response = with_request_error_handling do
client.post(Routes::UPDATE_DESIRED_LRP, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::DesiredLRPLifecycleResponse)
end
def remove_desired_lrp(process_guid)
request = protobuf_encode!({ process_guid: }, Bbs::Models::RemoveDesiredLRPRequest)
response = with_request_error_handling do
client.post(Routes::REMOVE_DESIRED_LRP, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::DesiredLRPLifecycleResponse)
end
def retire_actual_lrp(actual_lrp_key)
request = protobuf_encode!({ actual_lrp_key: }, Bbs::Models::RetireActualLRPRequest)
response = with_request_error_handling do
client.post(Routes::RETIRE_ACTUAL_LRP, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::ActualLRPLifecycleResponse)
end
def desired_lrp_scheduling_infos(domain)
request = protobuf_encode!({ domain: }, Bbs::Models::DesiredLRPsRequest)
response = with_request_error_handling do
client.post(Routes::DESIRED_LRP_SCHEDULING_INFOS, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::DesiredLRPSchedulingInfosResponse)
end
def actual_lrps_by_process_guid(process_guid)
request = protobuf_encode!({ process_guid: }, Bbs::Models::ActualLRPsRequest)
response = with_request_error_handling do
client.post(Routes::ACTUAL_LRPS, request, headers)
end
validate_status_200!(response)
protobuf_decode!(response.body, Bbs::Models::ActualLRPsResponse)
end
def with_request_error_handling
delay = 0.25
max_delay = 5
retry_until = Time.now.utc + 60 # retry for 1 minute from now
factor = 2
begin
yield
rescue StandardError => e
if Time.now.utc > retry_until
@logger.error('Unable to establish a connection to diego backend, no more retries, raising an exception.')
raise RequestError.new(e.message)
else
sleep_time = [delay, max_delay].min
@logger.info("Attempting to connect to the diego backend. Total #{(retry_until - Time.now.utc).round(2)} seconds remaining. Next retry after #{sleep_time} seconds.")
sleep(sleep_time)
delay *= factor
retry
end
end
end
private
attr_reader :client
def protobuf_encode!(hash, protobuf_message_class)
# See below link to understand proto3 message encoding
# https://developers.google.com/protocol-buffers/docs/reference/ruby-generated#message
protobuf_message_class.encode(protobuf_message_class.new(hash))
rescue StandardError => e
raise EncodeError.new(e.message)
end
def validate_status_200!(response)
raise ResponseError.new("failed with status: #{response.status}, body: #{response.body}") unless response.status == 200
end
def protobuf_decode!(message, protobuf_decoder)
protobuf_decoder.decode(message)
rescue StandardError => e
raise DecodeError.new(e.message)
end
def build_client(url, ca_cert_file, client_cert_file, client_key_file,
connect_timeout, send_timeout, receive_timeout)
client = HTTPClient.new(base_url: url)
client.socket_connect_timeout = connect_timeout / 2
client.connect_timeout = connect_timeout
client.send_timeout = send_timeout
client.receive_timeout = receive_timeout
client.ssl_config.set_client_cert_file(client_cert_file, client_key_file)
client.ssl_config.set_trust_ca(ca_cert_file)
client
end
def headers
{ 'Content-Type' => 'application/x-protobuf', 'X-Vcap-Request-Id' => ::VCAP::Request.current_id.to_s.split(':')[0].to_s }
end
end
end