Protobuf on Rails Tips

1. ©2019 Wantedly, Inc. Protobuf on Rails Tips Meguro.rb #29 Feb 22, 2019 - Hazumi Ichijo
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3. ©2019 Wantedly, Inc. Protobuf पΓͷTipsΛ࿩͍ͨ͠
4. ©2019 Wantedly, Inc. ͦ΋ͦ΋Protobuf(Protocol Buffers)ͱ͸
5. ©2019 Wantedly, Inc.
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10. ©2019 Wantedly, Inc. syntax = "proto3"; option ruby_package = "SamplePB"; message User { string user_name = 1; string introduction = 2; int64 age = 3; repeated Education educations = 4; repeated Experience experiences = 5; // ֶྺ message Education { string school_name = 1; } // ৬ྺ message Experience { string company_name = 1; } }
11. ©2019 Wantedly, Inc. user = SamplePB::User.new(user_name: "Ұᑍ୺੅") # <SamplePB::User: user_name: "Ұᑍ୺੅", introduction: "", age: 0, educations: [], experiences: []> encoded = SamplePB::User.encode(user) # "\n\f\xE4\xB8\x80\xE6\xA2\x9D\xE7\xAB\xAF\xE6\xBE\x84" SamplePB::User.decode(decoded) # <SamplePB::User: user_name: "Ұᑍ୺੅", introduction: "", age: 0, educations: [], experiences: []> user.to_json # "{\"userName\":\"Ұᑍ୺੅\"}"
12. ©2019 Wantedly, Inc. # Generated by the protocol buffer compiler. DO NOT EDIT! # source: protos/sample.proto require 'google/protobuf' Google::Protobuf::DescriptorPool.generated_pool.build do add_message "User" do optional :user_name, :string, 1 optional :introduction, :string, 2 optional :age, :int64, 3 repeated :educations, :message, 4, "User.Education" repeated :experiences, :message, 5, "User.Experience" end add_message "User.Education" do optional :school_name, :string, 1 end add_message "User.Experience" do optional :company_name, :string, 1 end end module SamplePB User = Google::Protobuf::DescriptorPool.generated_pool.lookup("User").msgclass User::Education = Google::Protobuf::DescriptorPool.generated_pool.lookup("User.Education").msgclass User::Experience = Google::Protobuf::DescriptorPool.generated_pool.lookup("User.Experience").msgclass end
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 ʢ31$ͳΒ͔ͳΓخ͍͠ʣ syntax = "proto3"; option ruby_package = "Protos::SamplePB"; message User { string user_name = 1; string introduction = 2; int64 age = 3; repeated Education educations = 4; repeated Experience experiences = 5; // ֶྺ message Education { string school_name = 1; } // ৬ྺ message Experience { string company_name = 1; } }
14. ©2019 Wantedly, Inc. irb(main):001:0> SamplePB::User => SamplePB::User irb(main):002:0> SamplePB::User => SamplePB::User irb(main):003:0> reload! Reloading... => true irb(main):004:0> SamplePB::User Traceback (most recent call last): 4: from (irb):4 3: from app/protos/sample_pb.rb:6:in `<top (required)>' 2: from app/protos/sample_pb.rb:6:in `build' 1: from app/protos/sample_pb.rb:6:in `finalize_to_pool' RuntimeError (Unable to add defs to DescriptorPool: Symtab already has a def named 'User') Reload!͢Δͱࣦഊ͢Δ໰୊
15. ©2019 Wantedly, Inc. https://github.com/ruby-protobuf/protobuf/issues/381# grpc_root = File.join(config.root, "/lib/ruby_proto") $LOAD_PATH.unshift(grpc_root) Dir[File.join(grpc_root, "**/*.rb")].each do |file| require file end Reload!͢Δͱࣦഊ͢Δ໰୊
16. ©2019 Wantedly, Inc. protocͷόʔδϣϯ؅ཧ Running via Spring preloader in process 83352 Loading development environment (Rails 5.1.7) irb(main):001:0> SamplePB Traceback (most recent call last): 5: from (irb):1 4: from app/protos/sample_pb.rb:6:in `<top (required)>' 3: from app/protos/sample_pb.rb:6:in `build' 2: from app/protos/sample_pb.rb:6:in `instance_eval' 1: from app/protos/sample_pb.rb:7:in `block in <top (required)>' NoMethodError (undefined method `add_file' for #<Google::Protobuf::Internal::Builder:0x00007ff4648e94b8>) Did you mean? add_enum w 1SPUPDͷόʔδϣϯ
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17. ©2019 Wantedly, Inc. protocͷόʔδϣϯ؅ཧ https://github.com/uber/prototool
18. ©2019 Wantedly, Inc. protocͷόʔδϣϯ؅ཧ protoc: version: 3.7.0 lint: group: uber2 generate: plugins: - name: ruby output: ./app
19. ©2019 Wantedly, Inc. ศརͳWell-Known Types syntax = "proto3"; option ruby_package = "SamplePB"; import "google/protobuf/timestamp.proto"; import "google/protobuf/wrappers.proto"; message User { ... google.protobuf.Timestamp created_at = 6; google.protobuf.BoolValue accepted = 7; ... }
20. ©2019 Wantedly, Inc. irb(main):020:0> SamplePB::User.new(created_at: Time.now, accepted: Google::Protobuf::BoolValue.new(value: true)).to_json => "{\"createdAt\":\"2019-07-30T17:44:28.722279000Z\",\"accepted\":true}" ศརͳWell-Known Types