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require 'uri'
module ActiveRecord
module ConnectionAdapters
class ConnectionSpecification #:nodoc:
attr_reader :config, :adapter_method
def initialize(config, adapter_method)
@config, @adapter_method = config, adapter_method
end
def initialize_dup(original)
@config = original.config.dup
end
# Expands a connection string into a hash.
class ConnectionUrlResolver # :nodoc:
# == Example
#
# url = "postgresql://foo:bar@localhost:9000/foo_test?pool=5&timeout=3000"
# ConnectionUrlResolver.new(url).to_hash
# # => {
# "adapter" => "postgresql",
# "host" => "localhost",
# "port" => 9000,
# "database" => "foo_test",
# "username" => "foo",
# "password" => "bar",
# "pool" => "5",
# "timeout" => "3000"
# }
def initialize(url)
raise "Database URL cannot be empty" if url.blank?
@uri = URI.parse(url)
@adapter = @uri.scheme
@adapter = "postgresql" if @adapter == "postgres"
@query = @uri.query || ''
end
# Converts the given URL to a full connection hash.
def to_hash
config = raw_config.reject { |_,value| value.blank? }
config.map { |key,value| config[key] = uri_parser.unescape(value) if value.is_a? String }
config
end
private
def uri
@uri
end
def uri_parser
@uri_parser ||= URI::Parser.new
end
# Converts the query parameters of the URI into a hash.
#
# "localhost?pool=5&reap_frequency=2"
# # => { "pool" => "5", "reap_frequency" => "2" }
#
# returns empty hash if no query present.
#
# "localhost"
# # => {}
def query_hash
Hash[@query.split("&").map { |pair| pair.split("=") }]
end
def raw_config
query_hash.merge({
"adapter" => @adapter,
"username" => uri.user,
"password" => uri.password,
"port" => uri.port,
"database" => database,
"host" => uri.host })
end
# Returns name of the database.
# Sqlite3 expects this to be a full path or `:memory`.
def database
if @adapter == 'sqlite3'
if '/:memory:' == uri.path
':memory:'
else
uri.path
end
else
uri.path.sub(%r{^/},"")
end
end
end
##
# Builds a ConnectionSpecification from user input.
class Resolver # :nodoc:
attr_reader :configurations
# Accepts a hash two layers deep, keys on the first layer represent
# environments such as "production". Keys must be strings.
def initialize(configurations)
@configurations = configurations
end
# Returns a hash with database connection information.
#
# == Examples
#
# Full hash Configuration.
#
# configurations = { "production" => { "host" => "localhost", "database" => "foo", "adapter" => "sqlite3" } }
# Resolver.new(configurations).resolve(:production)
# # => {host: "localhost", database: "foo", adapter: "sqlite3"}
#
# Initialized with URL configuration strings.
#
# configurations = { "production" => "postgresql://localhost/foo" }
# Resolver.new(configurations).resolve(:production)
# # => { "host" => "localhost", "database" => "foo", "adapter" => "postgresql" }
#
def resolve(config)
if config
resolve_connection config
elsif defined?(Rails.env)
resolve_env_connection Rails.env.to_sym
else
raise AdapterNotSpecified
end
end
# Returns an instance of ConnectionSpecification for a given adapter.
# Accepts a hash one layer deep that contains all connection information.
#
# == Example
#
# config = { "production" => { "host" => "localhost", "database" => "foo", "adapter" => "sqlite3" } }
# spec = Resolver.new(config).spec(:production)
# spec.adapter_method
# # => "sqlite3"
# spec.config
# # => { "host" => "localhost", "database" => "foo", "adapter" => "sqlite3" }
#
def spec(config)
spec = resolve(config).symbolize_keys
raise(AdapterNotSpecified, "database configuration does not specify adapter") unless spec.key?(:adapter)
path_to_adapter = "active_record/connection_adapters/#{spec[:adapter]}_adapter"
begin
require path_to_adapter
rescue Gem::LoadError => e
raise Gem::LoadError, "Specified '#{spec[:adapter]}' for database adapter, but the gem is not loaded. Add `gem '#{e.name}'` to your Gemfile (and ensure its version is at the minimum required by ActiveRecord)."
rescue LoadError => e
raise LoadError, "Could not load '#{path_to_adapter}'. Make sure that the adapter in config/database.yml is valid. If you use an adapter other than 'mysql', 'mysql2', 'postgresql' or 'sqlite3' add the necessary adapter gem to the Gemfile.", e.backtrace
end
adapter_method = "#{spec[:adapter]}_connection"
ConnectionSpecification.new(spec, adapter_method)
end
private
# Returns fully resolved connection, accepts hash, string or symbol.
# Always returns a hash.
#
# == Examples
#
# Symbol representing current environment.
#
# Resolver.new("production" => {}).resolve_connection(:production)
# # => {}
#
# One layer deep hash of connection values.
#
# Resolver.new({}).resolve_connection("adapter" => "sqlite3")
# # => { "adapter" => "sqlite3" }
#
# Connection URL.
#
# Resolver.new({}).resolve_connection("postgresql://localhost/foo")
# # => { "host" => "localhost", "database" => "foo", "adapter" => "postgresql" }
#
def resolve_connection(spec)
case spec
when Symbol, String
resolve_env_connection spec
when Hash
resolve_hash_connection spec
end
end
# Takes the environment such as `:production` or `:development`.
# This requires that the @configurations was initialized with a key that
# matches.
#
#
# Resolver.new("production" => {}).resolve_env_connection(:production)
# # => {}
#
# Takes a connection URL.
#
# Resolver.new({}).resolve_env_connection("postgresql://localhost/foo")
# # => { "host" => "localhost", "database" => "foo", "adapter" => "postgresql" }
#
def resolve_env_connection(spec)
# Rails has historically accepted a string to mean either
# an environment key or a URL spec, so we have deprecated
# this ambiguous behaviour and in the future this function
# can be removed in favor of resolve_string_connection and
# resolve_symbol_connection.
if config = configurations[spec.to_s]
if spec.is_a?(String)
ActiveSupport::Deprecation.warn "Passing a string to ActiveRecord::Base.establish_connection " \
"for a configuration lookup is deprecated, please pass a symbol (#{spec.to_sym.inspect}) instead"
end
resolve_connection(config)
elsif spec.is_a?(String)
resolve_string_connection(spec)
else
raise(AdapterNotSpecified, "#{spec} database is not configured")
end
end
# Accepts a hash. Expands the "url" key that contains a
# URL database connection to a full connection
# hash and merges with the rest of the hash.
# Connection details inside of the "url" key win any merge conflicts
def resolve_hash_connection(spec)
if url = spec.delete("url")
connection_hash = resolve_string_connection(url)
spec.merge!(connection_hash)
end
spec
end
def resolve_string_connection(url)
ConnectionUrlResolver.new(url).to_hash
end
end
end
end
end
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