lib/fluent/rpc.rb
#
# Fluentd
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
require 'webrick'
module Fluent
module RPC
class Server
def initialize(endpoint, log)
m = endpoint.match(/^\[?(?<host>[0-9a-zA-Z:\-\.]+)\]?:(?<port>[0-9]+)$/)
raise Fluent::ConfigError, "Invalid rpc_endpoint: #{endpoint}" unless m
@bind = m[:host]
@port = m[:port]
@log = log
@server = WEBrick::HTTPServer.new(
BindAddress: @bind,
Port: @port,
Logger: WEBrick::Log.new(STDERR, WEBrick::Log::FATAL),
AccessLog: [],
)
end
def mount(path, servlet, *args)
@server.mount(path, servlet, *args)
@log.debug "register #{path} RPC servlet"
end
def mount_proc(path, &block)
@server.mount_proc(path) { |req, res|
begin
code, header, response = block.call(req, res)
rescue => e
@log.warn "failed to handle RPC request", path: path, error: e.to_s
@log.warn_backtrace e.backtrace
code = 500
body = {
'message '=> 'Internal Server Error',
'error' => "#{e}",
'backtrace'=> e.backtrace,
}
end
code = 200 if code.nil?
header = {'Content-Type' => 'application/json'} if header.nil?
body = if response.nil?
'{"ok":true}'
else
response.body['ok'] = code == 200
response.body.to_json
end
res.status = code
header.each_pair { |k, v|
res[k] = v
}
res.body = body
}
@log.debug "register #{path} RPC handler"
end
def start
@log.debug "listening RPC http server on http://#{@bind}:#{@port}/"
@thread = Thread.new {
@server.start
}
end
def shutdown
if @server
@server.shutdown
@server = nil
end
if @thread
@thread.join
@thread = nil
end
end
end
end
end