nnoble | 097ef9b | 2014-12-01 17:06:10 -0800 | [diff] [blame^] | 1 | # Copyright 2014, Google Inc. |
| 2 | # All rights reserved. |
| 3 | # |
| 4 | # Redistribution and use in source and binary forms, with or without |
| 5 | # modification, are permitted provided that the following conditions are |
| 6 | # met: |
| 7 | # |
| 8 | # * Redistributions of source code must retain the above copyright |
| 9 | # notice, this list of conditions and the following disclaimer. |
| 10 | # * Redistributions in binary form must reproduce the above |
| 11 | # copyright notice, this list of conditions and the following disclaimer |
| 12 | # in the documentation and/or other materials provided with the |
| 13 | # distribution. |
| 14 | # * Neither the name of Google Inc. nor the names of its |
| 15 | # contributors may be used to endorse or promote products derived from |
| 16 | # this software without specific prior written permission. |
| 17 | # |
| 18 | # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 19 | # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 20 | # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 21 | # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 22 | # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 23 | # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 24 | # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 25 | # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 26 | # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 27 | # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 28 | # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 29 | |
| 30 | #!/usr/bin/env ruby |
| 31 | # |
| 32 | # Sample gRPC Ruby server that implements the Math::Calc service and helps |
| 33 | # validate GRPC::RpcServer as GRPC implementation using proto2 serialization. |
| 34 | # |
| 35 | # Usage: $ path/to/math_server.rb |
| 36 | |
| 37 | this_dir = File.expand_path(File.dirname(__FILE__)) |
| 38 | lib_dir = File.join(File.dirname(this_dir), 'lib') |
| 39 | $LOAD_PATH.unshift(lib_dir) unless $LOAD_PATH.include?(lib_dir) |
| 40 | $LOAD_PATH.unshift(this_dir) unless $LOAD_PATH.include?(this_dir) |
| 41 | |
| 42 | require 'forwardable' |
| 43 | require 'grpc' |
| 44 | require 'grpc/generic/service' |
| 45 | require 'grpc/generic/rpc_server' |
| 46 | require 'math.pb' |
| 47 | |
| 48 | # Holds state for a fibonacci series |
| 49 | class Fibber |
| 50 | |
| 51 | def initialize(limit) |
| 52 | raise "bad limit: got #{limit}, want limit > 0" if limit < 1 |
| 53 | @limit = limit |
| 54 | end |
| 55 | |
| 56 | def generator |
| 57 | return enum_for(:generator) unless block_given? |
| 58 | idx, current, previous = 0, 1, 1 |
| 59 | until idx == @limit |
| 60 | if idx == 0 || idx == 1 |
| 61 | yield Math::Num.new(:num => 1) |
| 62 | idx += 1 |
| 63 | next |
| 64 | end |
| 65 | tmp = current |
| 66 | current = previous + current |
| 67 | previous = tmp |
| 68 | yield Math::Num.new(:num => current) |
| 69 | idx += 1 |
| 70 | end |
| 71 | end |
| 72 | end |
| 73 | |
| 74 | # A EnumeratorQueue wraps a Queue to yield the items added to it. |
| 75 | class EnumeratorQueue |
| 76 | extend Forwardable |
| 77 | def_delegators :@q, :push |
| 78 | |
| 79 | def initialize(sentinel) |
| 80 | @q = Queue.new |
| 81 | @sentinel = sentinel |
| 82 | end |
| 83 | |
| 84 | def each_item |
| 85 | return enum_for(:each_item) unless block_given? |
| 86 | loop do |
| 87 | r = @q.pop |
| 88 | break if r.equal?(@sentinel) |
| 89 | raise r if r.is_a?Exception |
| 90 | yield r |
| 91 | end |
| 92 | end |
| 93 | |
| 94 | end |
| 95 | |
| 96 | # The Math::Math:: module occurs because the service has the same name as its |
| 97 | # package. That practice should be avoided by defining real services. |
| 98 | class Calculator < Math::Math::Service |
| 99 | |
| 100 | def div(div_args, call) |
| 101 | if div_args.divisor == 0 |
| 102 | # To send non-OK status handlers raise a StatusError with the code and |
| 103 | # and detail they want sent as a Status. |
| 104 | raise GRPC::StatusError.new(GRPC::Status::INVALID_ARGUMENT, |
| 105 | 'divisor cannot be 0') |
| 106 | end |
| 107 | |
| 108 | Math::DivReply.new(:quotient => div_args.dividend/div_args.divisor, |
| 109 | :remainder => div_args.dividend % div_args.divisor) |
| 110 | end |
| 111 | |
| 112 | def sum(call) |
| 113 | # the requests are accesible as the Enumerator call#each_request |
| 114 | nums = call.each_remote_read.collect { |x| x.num } |
| 115 | sum = nums.inject { |sum,x| sum + x } |
| 116 | Math::Num.new(:num => sum) |
| 117 | end |
| 118 | |
| 119 | def fib(fib_args, call) |
| 120 | if fib_args.limit < 1 |
| 121 | raise StatusError.new(Status::INVALID_ARGUMENT, 'limit must be >= 0') |
| 122 | end |
| 123 | |
| 124 | # return an Enumerator of Nums |
| 125 | Fibber.new(fib_args.limit).generator() |
| 126 | # just return the generator, GRPC::GenericServer sends each actual response |
| 127 | end |
| 128 | |
| 129 | def div_many(requests) |
| 130 | # requests is an lazy Enumerator of the requests sent by the client. |
| 131 | q = EnumeratorQueue.new(self) |
| 132 | t = Thread.new do |
| 133 | begin |
| 134 | requests.each do |req| |
| 135 | logger.info("read #{req.inspect}") |
| 136 | resp = Math::DivReply.new(:quotient => req.dividend/req.divisor, |
| 137 | :remainder => req.dividend % req.divisor) |
| 138 | q.push(resp) |
| 139 | Thread::pass # let the internal Bidi threads run |
| 140 | end |
| 141 | logger.info('finished reads') |
| 142 | q.push(self) |
| 143 | rescue StandardError => e |
| 144 | q.push(e) # share the exception with the enumerator |
| 145 | raise e |
| 146 | end |
| 147 | end |
| 148 | t.priority = -2 # hint that the div_many thread should not be favoured |
| 149 | q.each_item |
| 150 | end |
| 151 | |
| 152 | end |
| 153 | |
| 154 | def main |
| 155 | host_port = 'localhost:7070' |
| 156 | if ARGV.size > 0 |
| 157 | host_port = ARGV[0] |
| 158 | end |
| 159 | |
| 160 | s = GRPC::RpcServer.new() |
| 161 | s.add_http2_port(host_port) |
| 162 | s.handle(Calculator) |
| 163 | s.run |
| 164 | end |
| 165 | |
| 166 | main |