The Ultimate Guide to Ruby Timeouts

An unresponsive service can be worse than a down one. It can tie up your entire system if not handled properly. All network requests should have a timeout.

Here’s how to add timeouts for popular Ruby gems. All have been tested. You should avoid Ruby’s Timeout module. The default is no timeout, unless otherwise specified. Enjoy!

Timeout Types

connect (or open) - time to open the connection
read (or receive) - time to receive data after connected
write (or send) - time to send data after connected
checkout - time to checkout a connection from the pool
statement - time to execute a database statement

Statement Timeouts

For many apps, the single most important thing to do (if you use a relational database)

PostgreSQL
MySQL
MariaDB

Gems

Data Stores

activerecord
bunny
cassandra-driver
connection_pool
couchrest
dalli
drill-sergeant
elasticsearch
hiredis
influxdb
mongo
mongoid
mysql2
neo4j
pg
presto-client
redis
riddle
rsolr
ruby-druid
ruby-kafka
searchkick
sequel

HTTP Clients

curb
em-http-client
excon
faraday
http
httparty
httpclient
httpi
net/http
open-uri
patron
rest-client
typhoeus
unirest

Commands

frontkick
mixlib-shellout
posix-spawn
tty-command

Web Servers

puma
unicorn

Rack Middleware

rack-timeout
slowpoke

3rd Party Services

airrecord
airtable
algoliasearch
aws-sdk
azure
bitly
boxr
checkr-official
clearbit
coinbase
dogapi
dropbox-sdk
droplet_kit
fastly
firebase
flickraw
gibbon
github_api
google-api-client
google-cloud
hipchat
intercom
koala
linkedin
octokit
pinterest-api
pwned
restforce
rspotify
shopify_api
sift
slack-notifier
slack-ruby-client
smartystreets_ruby_sdk
soda-ruby
soundcloud
stripe
tamber
twilio-ruby
twitter
yt
zendesk_api

Other

acme-client
actionmailer
activemerchant
activeresource
active_shipping
carrot2
docker-api
fastimage
geocoder
graphql-client
grpc
kubeclient
mail
mechanize
nats-pure
nestful
net-dns
net/ftp
net-ldap
net-ntp
net-scp
net-sftp
net/smtp
net-ssh
net-telnet
omniauth-oauth2
reversed
savon
socket
spidr
spyke
stomp
vault
whois
zk
zookeeper

Statement Timeouts

Prevent single queries from taking up all of your database’s resources.

PostgreSQL

If you use Rails, add to your config/database.yml

production:
  variables:
    statement_timeout: 5s # or ms, min, etc

or set it on your database role

ALTER ROLE myuser SET statement_timeout = '5s';

Test with

SELECT pg_sleep(6);

To set for a single transaction, use

BEGIN;
SET LOCAL statement_timeout = '5s';
...
COMMIT;

For migrations, you likely want to set a longer statement timeout. You can do this with

production:
  variables:
    statement_timeout: <%= ENV["STATEMENT_TIMEOUT"] || "5s" %>

And use

STATEMENT_TIMEOUT=90s rails db:migrate

MySQL

Note: Requires MySQL 5.7.8 or higher

If you use Rails, add to your config/database.yml

production:
  variables:
    max_execution_time: 5000 # ms

or set it directly on each connection

SET SESSION max_execution_time = 5000;

Test with

SELECT 1 FROM information_schema.tables WHERE sleep(6);

To set for a single statement, use an optimizer hint

SELECT /*+ MAX_EXECUTION_TIME(5000) */ ...

For migrations, you likely want to set a longer statement timeout. You can do this with

production:
  variables:
    max_execution_time: <%= ENV["MAX_EXECUTION_TIME"] || 5000 %>

And use

MAX_EXECUTION_TIME=90000 rails db:migrate

MariaDB

Note: Requires MariaDB 10.1.1 or higher

If you use Rails, add to your config/database.yml

production:
  variables:
    max_statement_time: 5 # sec

or set it directly on each connection

SET SESSION max_statement_time = 5;

Test with

SELECT 1 FROM information_schema.tables WHERE sleep(6);

As of MariaDB 10.1.2, you can set single statement timeouts with

SET STATEMENT max_statement_time=5 FOR
  SELECT ...

For migrations, you likely want to set a longer statement timeout. You can do this with

production:
  variables:
    max_statement_time: <%= ENV['MAX_STATEMENT_TIME'] || 5 %>

And use

MAX_STATEMENT_TIME=90 rails db:migrate

Official docs

Data Stores

activerecord

postgres adapter
```
ActiveRecord::Base.establish_connection(connect_timeout: 1, checkout_timeout: 1, ...)
```
or in config/database.yml
```
production:
  connect_timeout: 1
  checkout_timeout: 1
```
Raises
- PG::ConnectionBad on connect and read timeouts
- ActiveRecord::ConnectionTimeoutError on checkout timeout
See also PostgreSQL statement timeouts

mysql2 adapter

ActiveRecord::Base.establish_connection(connect_timeout: 1, read_timeout: 1, write_timeout: 1, checkout_timeout: 1, ...)

or in config/database.yml

production:
  connect_timeout: 1
  read_timeout: 1
  write_timeout: 1
  checkout_timeout: 1

Raises

Mysql2::Error on connect and read timeouts
ActiveRecord::ConnectionTimeoutError on checkout timeout

bunny

Bunny.new(connection_timeout: 1, read_timeout: 1, ...)

Raises

Bunny::TCPConnectionFailedForAllHosts on connect timeout
Bunny::NetworkFailure on read timeout

cassandra-driver

Cassandra.cluster(connect_timeout: 1, timeout: 1)

Default: 10s connect timeout, 12s read timeout

Raises

Cassandra::Errors::NoHostsAvailable on connect timeout
Cassandra::Errors::TimeoutError on read timeout

connection_pool

ConnectionPool.new(timeout: 1) { ... }

Raises Timeout::Error

couchrest

CouchRest.new(url, open_timeout: 1, read_timeout: 1, timeout: 1)

Raises

HTTPClient::ConnectTimeoutError on connect timeout
HTTPClient::ReceiveTimeoutError on read timeout

dalli

Dalli::Client.new(host, socket_timeout: 1, ...)

Default: 0.5s

Raises Dalli::RingError

drill-sergeant

Drill.new(url: url, open_timeout: 1, read_timeout: 1)

Default: 3s connect timeout, no read timeout

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

elasticsearch

Elasticsearch::Client.new(transport_options: {request: {timeout: 1}}, ...)

Raises

Faraday::ConnectionFailed on connect timeout
Faraday::TimeoutError on read timeout

hiredis

conn = Hiredis::Connection.new
conn.timeout = 1_000_000 # microseconds

Raises

Errno::ETIMEDOUT on connect timeout
Errno::EAGAIN on read timeout

influxdb

InfluxDB::Client.new(open_timeout: 1, read_timeout: 1)

Raises InfluxDB::ConnectionError

mongo

Mongo::Client.new([host], connect_timeout: 1, socket_timeout: 1, server_selection_timeout: 1, ...)

Raises Mongo::Error::NoServerAvailable

mongoid

production:
  clients:
    default:
      options:
        connect_timeout: 1
        socket_timeout: 1
        server_selection_timeout: 1

Raises Mongo::Error::NoServerAvailable

mysql2

Mysql2::Client.new(connect_timeout: 1, read_timeout: 1, write_timeout: 1, ...)

Raises Mysql2::Error

neo4j

config.neo4j.session.options = {
  faraday_configurator: lambda do |faraday|
    faraday.adapter :typhoeus
    faraday.options[:open_timeout] = 5
    faraday.options[:timeout] = 65
  end
}

Raises Faraday::Error::TimeoutError

pg

PG.connect(connect_timeout: 1, ...)

Raises PG::ConnectionBad

presto-client

Presto::Client.new(http_open_timeout: 1, http_timeout: 1)

Raises

Faraday::ConnectionFailed on connect timeout
Faraday::TimeoutError on read timeout

redis

Redis.new(connect_timeout: 1, timeout: 1, ...)

Default: 5s

Raises

Redis::CannotConnectError on connect timeout
Redis::TimeoutError on read timeout

riddle

client = Riddle::Client.new
client.timeout = 1

Raises Riddle::ResponseError

rsolr

RSolr.connect(open_timeout: 1, read_timeout: 1)

Raises

RSolr::Error::ConnectionRefused on connect timeout
RSolr::Error::Http on read timeout

ruby-druid

Not configurable at the moment

Default: 10s connect timeout, no read timeout

ruby-kafka

Kafka.new(connect_timeout: 1, socket_timeout: 1)

Raises Kafka::ConnectionError

searchkick

Searchkick.timeout = 1
Searchkick.search_timeout = 1

Default: 10s

Raises same exceptions as elasticsearch

sequel

postgres adapter
```
Sequel.connect(connect_timeout: 1, pool_timeout: 1, ...)
```
- Sequel::DatabaseConnectionError on connect and read timeouts
- Sequel::PoolTimeout on checkout timeout
mysql2 adapter
```
Sequel.connect(timeout: 1, read_timeout: 1, connect_timeout: 1, pool_timeout: 1, ...)
```
Raises
- Sequel::DatabaseConnectionError on connect and read timeouts
- Sequel::PoolTimeout on checkout timeout

HTTP Clients

curb

curl = Curl::Easy.new(url)
curl.connect_timeout = 1
curl.timeout = 1
curl.perform

Raises Curl::Err::TimeoutError

em-http-client

EventMachine.run do
  http = EventMachine::HttpRequest.new(url, connect_timeout: 1, inactivity_timeout: 1).get
  http.errback  { http.error }
end

No exception is raised, but http.error is set to Errno::ETIMEDOUT in http.errback.

excon

Excon.get(url, connect_timeout: 1, read_timeout: 1, write_timeout: 1)

Raises Excon::Errors::Timeout

faraday

Faraday.get(url) do |req|
  req.options.open_timeout = 1
  req.options.timeout = 1
end

or

Faraday.new(url, request: {open_timeout: 1, timeout: 1}) do |faraday|
  # ...
end

Raises

Faraday::ConnectionFailed on connect timeout
Faraday::TimeoutError on read timeout

http

HTTP.timeout(connect: 1, read: 1, write: 1).get(url)

Raises HTTP::TimeoutError

httparty

HTTParty.get(url, timeout: 1)

or

class Resource
  include HTTParty

  default_timeout 1
  # or
  open_timeout 1
  read_timeout 1
  write_timeout 1
end

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

httpclient

client = HTTPClient.new
client.connect_timeout = 1
client.receive_timeout = 1
client.send_timeout = 1
client.get(url)

Raises

HTTPClient::ConnectTimeoutError on connect timeout
HTTPClient::ReceiveTimeoutError on read timeout

httpi

HTTPI::Request.new(url: url, open_timeout: 1)

Raises same errors as underlying client

net/http

Net::HTTP.start(host, port, open_timeout: 1, read_timeout: 1, write_timeout: 1) do
  # ...
end

or

http = Net::HTTP.new(host, port)
http.open_timeout = 1
http.read_timeout = 1
http.write_timeout = 1

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout
Net::WriteTimeout on write timeout

Default: 60s connect timeout, 60s read timeout, 60s write timeout

Write timeout can be set in Ruby 2.6+. Read timeouts are retried once automatically for idempotent methods like GET. In Ruby 2.5+, you can set the number of retries with http.max_retries = 1.

open-uri

open(url, open_timeout: 1, read_timeout: 1)

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

patron

sess = Patron::Session.new
sess.connect_timeout = 1
sess.timeout = 1

Raises Patron::TimeoutError

rest-client

RestClient::Request.execute(method: :get, url: url, open_timeout: 1, read_timeout: 1)

# shorthand to set open_timeout = read_timeout = 1
RestClient::Request.execute(method: :get, url: url, timeout: 1)

Same options also work with RestClient::Resource.

Raises

RestClient::Exceptions::OpenTimeout on connect timeout
RestClient::Exceptions::ReadTimeout on read timeout

Default: 60s connect timeout, 60s read timeout

typhoeus

response = Typhoeus.get(url, connecttimeout: 1, timeout: 1)

No exception is raised. Check for a timeout with

response.timed_out?

unirest

Unirest.timeout(1)

Connect timeout is not configurable

Default: 10s read timeout, no connect timeout

Raises RuntimeError

Commands

frontkick

Frontkick.exec(command, timeout: 1)

Raises Frontkick::Timeout

mixlib-shellout

Mixlib::ShellOut.new(command, timeout: 1)

Raises Mixlib::ShellOut::CommandTimeout

posix-spawn

POSIX::Spawn::Child.new(command, timeout: 1)

Raises POSIX::Spawn::TimeoutExceeded

tty-command

TTY::Command.new(timeout: 1)

or

cmd.run(command, timeout: 1)

Raises TTY::Command::TimeoutExceeded

Web Servers

puma

# config/puma.rb
worker_timeout 15

Default: 30s

This kills and respawns the worker process. Note that this is for the worker and not threads. This isn’t a request timeout either. Use Rack middleware for request timeouts.

# config/puma.rb
worker_shutdown_timeout 8

Default: 60s

This causes Puma to send a SIGKILL signal to a worker if it hasn’t shutdown within the specified time period after having received a SIGTERM signal.

unicorn

# config/unicorn.rb
timeout 15

Default: 60s

This kills and respawns the worker process.

It’s recommended to use this in addition to Rack middleware.

Rack Middleware

rack-timeout

use Rack::Timeout,
  service_timeout:   15,     # ENV["RACK_TIMEOUT_SERVICE_TIMEOUT"]
  wait_timeout:      30,     # ENV["RACK_TIMEOUT_WAIT_TIMEOUT"]
  wait_overtime:     60,     # ENV["RACK_TIMEOUT_WAIT_OVERTIME"]
  service_past_wait: false,  # ENV["RACK_TIMEOUT_SERVICE_PAST_WAIT"]
  term_on_timeout:   false   # ENV["RACK_TIMEOUT_TERM_ON_TIMEOUT"]

Default: 15s service timeout, 30s wait timeout

Raises Rack::Timeout::RequestTimeoutError or Rack::Timeout::RequestExpiryError

slowpoke

Slowpoke.timeout = 5

Default: 15s

Raises same exceptions as rack-timeout

3rd Party Services

airrecord

Not configurable at the moment, and no timeout by default

airtable

Airtable::Resource.default_timeout 1

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

algoliasearch

Algolia.init(
  connect_timeout: 1,
  send_timeout: 1,
  receive_timeout: 1,
  batch_timeout: 1,
  search_timeout: 1
)

Raises Algolia::AlgoliaProtocolError

aws-sdk

Aws.config = {
  http_open_timeout: 1,
  http_read_timeout: 1
}

Or with a client

Aws::S3::Client.new(
  http_open_timeout: 1,
  http_read_timeout: 1
)

Raises Seahorse::Client::NetworkingError

azure

Not configurable at the moment, and no timeout by default

bitly

Not configurable at the moment, and no timeout by default

boxr

Not configurable at the moment, and no timeout by default

checkr-official

Default: 30s connect timeout, 60s read timeout

Not configurable at the moment

clearbit

Clearbit::Resource.options = {timeout: 1}

Raises Nestful::TimeoutError

coinbase

Not configurable at the moment

dogapi

timeout = 1
Dogapi::Client.new(api_key, nil, nil, nil, false, timeout)

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

dropbox-sdk

Not configurable at the moment

Default: No connect timeout, 600s read timeout

droplet_kit

DropletKit::Client.new(open_timeout: 1, timeout: 1)

Raises

Faraday::ConnectionFailed on connect timeout
Faraday::TimeoutError on read timeout

fastly

Not configurable at the moment, and no timeout by default

firebase

firebase = Firebase::Client.new(url)
firebase.request.connect_timeout = 1
firebase.request.receive_timeout = 1
firebase.request.send_timeout = 1

Raises

HTTPClient::ConnectTimeoutError on connect timeout
HTTPClient::ReceiveTimeoutError on read timeout

flickraw

Not configurable at the moment

gibbon

Gibbon::Request.new(open_timeout: 1, timeout: 1, ...)

Raises Gibbon::MailChimpError

github_api

Github.new(connection_options: {request: {open_timeout: 1, timeout: 1}})

Raises

Faraday::ConnectionFailed on connect timeout
Faraday::TimeoutError on read timeout

google-api-client

client = Google::Apis::DriveV2::DriveService.new
client.client_options.open_timeout_sec = 1
client.client_options.read_timeout_sec = 1

Raise Google::Apis::TransmissionError

google-cloud

Google::Cloud::Storage.new(timeout: 1)

Raises Google::Cloud::Error

hipchat

[HipChat::Client, HipChat::Room, HipChat::User].each { |c| c.default_timeout(1) }

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

intercom

client = Intercom::Client.new(token: token)
client.options(Intercom::Client.set_timeouts(open_timeout: 1, read_timeout: 1))

Raises

Intercom::ServiceConnectionError on connect timeout (inherits from Intercom::IntercomError)
Intercom::ServiceUnavailableError on read timeout (inherits from Intercom::IntercomError)

koala

Koala.http_service.http_options = {request: {open_timeout: 1, timeout: 1}}

Raises

Faraday::ConnectionFailed on connect timeout
Faraday::TimeoutError on read timeout

linkedin

Not configurable at the moment, and no timeout by default.

octokit

Octokit::Client.new(connection_options: {request: {open_timeout: 1, timeout: 1}})

Raises

Faraday::ConnectionFailed on connect timeout
Faraday::TimeoutError on read timeout

pinterest-api

Pinterest::Client.new(access_token, request: {open_timeout: 1, timeout: 1})

Raises

Faraday::ConnectionFailed on connect timeout
Faraday::TimeoutError on read timeout

pwned

Pwned::Password.new("password", open_timeout: 1, read_timeout: 1)

Raises Pwned::TimeoutError

restforce

Restforce.new(timeout: 1)

Raises

Faraday::ConnectionFailed on connect timeout
Faraday::TimeoutError on read timeout

rspotify

Not configurable at the moment, and no timeout by default

shopify_api

ShopifyAPI::Base.timeout = 1

Raises ActiveResource::TimeoutError

sift

Sift::Client.new(timeout: 1)

Default: 2s

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

slack-notifier

Slack::Notifier.new(webhook_url, http_options: {open_timeout: 1, read_timeout: 1})

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

slack-ruby-client

Slack::Web::Client.new(open_timeout: 1, timeout: 1)

Raises

Faraday::ConnectionFailed on connect timeout
Faraday::TimeoutError on read timeout

smartystreets_ruby_sdk

SmartyStreets::ClientBuilder.new(credentials).with_max_timeout(1)

Connect timeout is not configurable at the moment

Raises Net::ReadTimeout on read timeout

soda-ruby

SODA::Client.new(timeout: 1)

Connect timeout is not configurable at the moment

Raises Net::ReadTimeout on read timeout

soundcloud

Not configurable at the moment, and no timeout by default

stripe

Stripe.open_timeout = 1
Stripe.read_timeout = 1

Default: 30s connect timeout, 80s read timeout

Raises Stripe::APIConnectionError

tamber

Tamber.open_timeout = 1
Tamber.read_timeout = 1

Raises Tamber::NetworkError

twilio-ruby

http_client = Twilio::HTTP::Client.new(timeout: 1)
Twilio::REST::Client.new(account_sid, auth_token, nil, nil, http_client)

Default: 30s

Raises Twilio::REST::TwilioError

twitter

Twitter::REST::Client.new do |config|
  config.timeouts = {connect: 1, read: 1, write: 1}
end

Raises HTTP::TimeoutError

yt

Not configurable at the moment, and no timeout by default

zendesk_api

ZendeskAPI::Client.new do |config|
  config.client_options = {request: {open_timeout: 1, timeout: 1}}
end

Default: 10s connect timeout, no read timeout

Raises ZendeskAPI::Error::NetworkError

Other

acme-client

Acme::Client.new(connection_options: {request: {open_timeout: 1, timeout: 1}})

Raises

Faraday::ConnectionFailed on connect timeout
Faraday::TimeoutError on read timeout

actionmailer

ActionMailer::Base.smtp_settings = {
  open_timeout: 1,
  read_timeout: 1
}

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

activemerchant

ActiveMerchant::Billing::Gateway.open_timeout = 1
ActiveMerchant::Billing::Gateway.read_timeout = 1

Default: 60s

Raises ActiveMerchant::ConnectionError

activeresource

class Person < ActiveResource::Base
  self.open_timeout = 1
  self.read_timeout = 1
end

Raises ActiveResource::TimeoutError

active_shipping

client = ActiveShipping::USPS.new(login: "developer-key")
client.open_timeout = 1
client.read_timeout = 1

Default: 2s connect timeout, 10s read timeout

Raises ActiveUtils::ConnectionError

carrot2

Carrot2.new(open_timeout: 1, read_timeout: 1)

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

docker-api

Docker.options = {
  read_timeout: 1
}

Connect timeout not configurable

Raises Docker::Error::TimeoutError

fastimage

FastImage.size(url, timeout: 1)

Returns nil on timeouts

If you pass raise_on_failure: true, raises FastImage::ImageFetchFailure

geocoder

Geocoder.configure(timeout: 1, ...)

No exception is raised by default. To raise exceptions, use

Geocoder.configure(timeout: 1, always_raise: :all, ...)

Raises Geocoder::LookupTimeout

graphql-client

GraphQL::Client::HTTP.new(url) do
  def connection
    conn = super
    conn.open_timeout = 1
    conn.read_timeout = 1
    conn
  end
end

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

grpc

RouteGuide::Stub.new(addr, :this_channel_is_insecure, timeout: 1)

Raises GRPC::DeadlineExceeded

kubeclient

Kubeclient::Client.new(url, timeouts: {open: 1, read: 1})

Raises KubeException

Default: 60s connect timeout, 60s read timeout

mail

Mail.defaults do
  delivery_method :smtp, open_timeout: 1, read_timeout: 1
end

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

mechanize

agent = Mechanize.new
agent.open_timeout = 1
agent.read_timeout = 1

Raises

Net::OpenTimeout on connect timeout
Net::HTTP::Persistent::Error on read timeout

nats-pure

nats = NATS::IO::Client.new
nats.connect(connect_timeout: 1)

Raises NATS::IO::SocketTimeoutError

nestful

Nestful::Request.new(url, timeout: 1)

or

class Resource < Nestful::Resource
  options timeout: 1
end

Raises Nestful::TimeoutError

net-dns

Net::DNS::Resolver.new(udp_timeout: 1)

Default: 5s

Raises Net::DNS::Resolver::NoResponseError

net/ftp

Net::FTP.new(host, open_timeout: 1, read_timeout: 1)

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

net/ldap

Net::LDAP.new(host: host, connect_timeout: 1)

Read timeout not configurable at the moment

Default: 5s connect timeout, no read timeout

Raises Net::LDAP::Error

net-ntp

timeout = 1
Net::NTP.get(host, port, timeout)

Raises Timeout::Error

net-scp

Net::SCP.start(host, user, timeout: 1)

Raises Net::SSH::ConnectionTimeout

net-sftp

Net::SFTP.start(host, user, timeout: 1)

Raises Net::SSH::ConnectionTimeout

net/smtp

smtp = Net::SMTP.new(host, 25)
smtp.open_timeout = 1
smtp.read_timeout = 1

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

net-ssh

Net::SSH.start(host, user, timeout: 1)

Raises Net::SSH::ConnectionTimeout

net-telnet

Net::Telnet::new("Host" => host, "Timeout" => 1)

Raises

Net::OpenTimeout on connect timeout
Net::ReadTimeout on read timeout

omniauth-oauth2

Not configurable at the moment, and no timeout by default

reversed

Reversed.lookup("8.8.8.8", timeout: 1)

Returns nil on timeouts

savon

Savon.client(wsdl: url, open_timeout: 1, read_timeout: 1)

Raises

HTTPClient::ConnectTimeoutError on connect timeout
HTTPClient::ReceiveTimeoutError on read timeout

socket

Socket.tcp(host, 80, connect_timeout: 1) do |sock|
  # ...
end

Raises Errno::ETIMEDOUT

spydr

Spidr.open_timeout = 1
Spidr.read_timeout = 1

No exception is raised. Check for failures with

agent = Spidr.site(url)
agent.failures

spyke

Spyke::Base.connection = Faraday.new(url: url) do |c|
  c.adapter Faraday.default_adapter
  c.options[:open_timeout] = 1
  c.options[:timeout] = 1
end

Raises Spyke::ConnectionError

stomp

Stomp::Client.new(start_timeout: 1, connect_timeout: 1, connread_timeout: 1, parse_timeout: 1)

Raises

Stomp::Error::StartTimeoutException on connect timeout
Stomp::Error::ReceiveTimeout on read timeout

vault

Vault.configure do |config|
  config.timeout = 1

  # or more granular
  config.ssl_timeout  = 1
  config.open_timeout = 1
  config.read_timeout = 1
end

Raises Vault::HTTPConnectionError

whois

Whois::Client.new(timeout: 1)

Default: 10s

Raises Timeout::Error

zk

Not configurable at the moment

Default: 30s

Raises Zookeeper::Exceptions::ContinuationTimeoutError

zookeeper

Not configurable at the moment

Default: 30s

Raises Zookeeper::Exceptions::ContinuationTimeoutError

Don’t see a library you use?

Let us know. Even better, create a pull request for it.

Rescuing Exceptions

Take advantage of inheritance. Instead of

rescue Net::OpenTimeout, Net::ReadTimeout

you can do

rescue Timeout::Error

Use

Timeout::Error for both Net::OpenTimeout and Net::ReadTimeout
Faraday::ClientError for both Faraday::ConnectionFailed and Faraday::TimeoutError
HTTPClient::TimeoutError for both HTTPClient::ConnectTimeoutError and HTTPClient::ReceiveTimeoutError
Redis::BaseConnectionError for both Redis::CannotConnectError and Redis::TimeoutError
Rack::Timeout::Error for both Rack::Timeout::RequestTimeoutError and Rack::Timeout::RequestExpiryError
RestClient::Exceptions::Timeout for both RestClient::Exceptions::OpenTimeout and RestClient::Exceptions::ReadTimeout

Existing Services

Adding timeouts to existing services can be a daunting task, but there’s a low risk way to do it.

Select a timeout - say 5 seconds
Log instances exceeding the proposed timeout
Fix them
Add the timeout
Repeat this process with a lower timeout, until your target timeout is achieved

Running the Tests

git clone https://github.com/ankane/the-ultimate-guide-to-ruby-timeouts.git
cd the-ultimate-guide-to-ruby-timeouts
bundle install
node test/server.js

To run all tests, use:

bundle exec appraisal rake test

To run individual tests, use:

bundle exec appraisal faraday rake test

To add a new gem:

Add it to Appraisals and run bundle exec appraisal generate
Run bundle exec appraisal new_gem bundle
Create test/new_gem_test.rb and run bundle exec appraisal new_gem rake test
Add it to the appropriate section of the readme

And lastly...

Because time is not going to go backwards, I think I better stop now. - Stephen Hawking

🕓

Name		Name	Last commit message	Last commit date
Latest commit History 357 Commits
gemfiles		gemfiles
test		test
.gitignore		.gitignore
.travis.yml		.travis.yml
Appraisals		Appraisals
Gemfile		Gemfile
Gemfile.lock		Gemfile.lock
README.md		README.md
Rakefile		Rakefile

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The Ultimate Guide to Ruby Timeouts

Timeout Types

Statement Timeouts

Gems

Statement Timeouts

PostgreSQL

MySQL

MariaDB

Data Stores

activerecord

postgres adapter

mysql2 adapter

bunny

cassandra-driver

connection_pool

couchrest

dalli

drill-sergeant

elasticsearch

hiredis

influxdb

mongo

mongoid

mysql2

neo4j

pg

presto-client

redis

riddle

rsolr

ruby-druid

ruby-kafka

searchkick

sequel

postgres adapter

mysql2 adapter

HTTP Clients

curb

em-http-client

excon

faraday

http

httparty

httpclient

httpi

net/http

open-uri

patron

rest-client

typhoeus

unirest

Commands

frontkick

mixlib-shellout

posix-spawn

tty-command

Web Servers

puma

unicorn

Rack Middleware

rack-timeout

slowpoke

3rd Party Services

airrecord

airtable

algoliasearch

aws-sdk

azure

bitly

boxr

checkr-official

clearbit

coinbase

dogapi

dropbox-sdk