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# -*- frozen-string-literal: true -*-
module Plum
class Client
DEFAULT_CONFIG = {
tls: true,
scheme: "https",
verify_mode: OpenSSL::SSL::VERIFY_PEER,
ssl_context: nil
}.freeze
attr_reader :host, :port, :config
attr_reader :socket
# Creates a new HTTP client and starts communication.
# A shorthand for `Plum::Client.new(args).start(&block)`
def self.start(host, port = nil, config = {}, &block)
client = self.new(host, port, config)
client.start(&block)
end
# Creates a new HTTP client.
# @param host [String | IO] the host to connect, or IO object.
# @param port [Integer] the port number to connect
# @param config [Hash<Symbol, Object>] the client configuration
def initialize(host, port = nil, config = {})
if host.is_a?(IO)
@socket = host
else
@host = host
@port = port || (config[:tls] ? 443 : 80)
end
@config = DEFAULT_CONFIG.merge(hostname: host).merge(config)
@started = false
end
# Starts communication.
# If block passed, waits for asynchronous requests and closes the connection after calling the block.
def start(&block)
raise IOError, "Session already started" if @started
_start
if block_given?
begin
ret = yield(self)
wait
return ret
ensure
close
end
end
self
end
# Waits for the asynchronous response(s) to finish.
# @param response [Response] if specified, waits only for the response
# @return [Response] if parameter response is specified
def wait(response = nil)
if response
@session.succ until response.failed? || response.finished?
response
else
@session.succ until @session.empty?
end
end
# Waits for the response headers.
# @param response [Response] the incomplete response.
def wait_headers(response)
@session.succ while !response.failed? && !response.headers
end
# Closes the connection immediately.
def close
@session.close if @session
ensure
@socket.close if @socket
end
# Creates a new HTTP request.
# @param headers [Hash<String, String>] the request headers
# @param body [String] the request body
# @param block [Proc] if passed, it will be called when received response headers.
def request_async(headers, body = nil, &block)
@session.request(headers, body, &block)
end
# Creates a new HTTP request and waits for the response
# @param headers [Hash<String, String>] the request headers
# @param body [String] the request body
def request(headers, body = nil, &block)
wait @session.request(headers, body, &block)
end
# @!method get
# @!method head
# @!method delete
# @param path [String] the absolute path to request (translated into :path header)
# @param headers [Hash] the request headers
# Shorthand method for `#request`
# @!method get_async
# @!method head_async
# @!method delete_async
# @param path [String] the absolute path to request (translated into :path header)
# @param headers [Hash] the request headers
# @param block [Proc] if specified, calls the block when finished
# Shorthand method for `#request_async`
%w(GET HEAD DELETE).each { |method|
define_method(:"#{method.downcase}") do |path, headers = {}, &block|
request({ ":method" => method, ":path" => path }.merge(headers), &block)
end
define_method(:"#{method.downcase}_async") do |path, headers = {}, &block|
request_async({ ":method" => method, ":path" => path }.merge(headers), nil, &block)
end
}
# @!method post
# @!method put
# @param path [String] the absolute path to request (translated into :path header)
# @param body [String] the request body
# @param headers [Hash] the request headers
# Shorthand method for `#request`
# @!method post_async
# @!method put_async
# @param path [String] the absolute path to request (translated into :path header)
# @param body [String] the request body
# @param headers [Hash] the request headers
# @param block [Proc] if specified, calls the block when finished
# Shorthand method for `#request_async`
%w(POST PUT).each { |method|
define_method(:"#{method.downcase}") do |path, body = nil, headers = {}, &block|
request({ ":method" => method, ":path" => path }.merge(headers), body, &block)
end
define_method(:"#{method.downcase}_async") do |path, body = nil, headers = {}, &block|
request_async({ ":method" => method, ":path" => path }.merge(headers), body, &block)
end
}
private
def _start
@started = true
http2 = true
unless @socket
@socket = TCPSocket.open(host, port)
if config[:tls]
ctx = @config[:ssl_context] || new_ssl_ctx
@socket = OpenSSL::SSL::SSLSocket.new(@socket, ctx)
@socket.hostname = @config[:hostname] if @socket.respond_to?(:hostname=)
@socket.sync_close = true
@socket.connect
@socket.post_connection_check(@config[:hostname]) if ctx.verify_mode != OpenSSL::SSL::VERIFY_NONE
if @socket.respond_to?(:alpn_protocol)
http2 = @socket.alpn_protocol == "h2"
elsif sock.respond_to?(:npn_protocol)
http2 = @socket.npn_protocol == "h2"
else
http2 = false
end
end
end
if http2
@session = ClientSession.new(@socket, @config)
else
@session = LegacyClientSession.new(@socket, @config)
end
end
def new_ssl_ctx
ctx = OpenSSL::SSL::SSLContext.new
ctx.ssl_version = :TLSv1_2
ctx.verify_mode = @config[:verify_mode]
cert_store = OpenSSL::X509::Store.new
cert_store.set_default_paths
ctx.cert_store = cert_store
if ctx.respond_to?(:alpn_protocols)
ctx.alpn_protocols = ["h2", "http/1.1"]
end
if ctx.respond_to?(:npn_select_cb) # TODO: RFC 7540 does not define protocol negotiation with NPN
ctx.npn_select_cb = -> protocols {
protocols.include?("h2") ? "h2" : protocols.first
}
end
ctx
end
end
end
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