How Uber "Go"es

Maintaining a large codebase with maximum readability and minimal overhead is hard. This is the story of how Go language went from a few enthusiastic Gophers to the most popular language for microservices at Uber. Learn where we failed, and how that led us to solutions that we think are pretty darn neat!

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21. level := os.Getenv("LOG_LEVEL") if level == "" { level = "info" } logger := log.New(os.Stdout, level, ...)
22. logger level := os.Getenv("LOG_LEVEL") if level == "" { level = "info" } logger := log.New(os.Stdout, level, ...)
23. logger config := struct{ ServiceName string }{} yaml.NewDecoder(file).Decode(&config)
24. logger config config := struct{ ServiceName string }{} yaml.NewDecoder(file).Decode(&config)
25. logger config server := lib.NewServer(...)
26. logger config server server := lib.NewServer(...)
27. logger config etc server ...
28. logger config etc server ...
29. logger config etc server ... tracer := tracing.New(logger, config) // * *jaegertracing.io server := lib.NewServer(lib.WithTracer(tracer))
30. logger config etc server ... tracer := tracing.New(logger, config) // * *jaegertracing.io
31. logger config etc *jaegertracing.io server tracer := tracing.New(logger, config) // *
32. logger config etc *jaegertracing.io server tracer := tracing.New(logger, config) // * tracer
33. logger config etc server server := lib.NewServer(lib.WithTracer(tracer)) tracer
34. logger config etc server tracer
35. logger config etc server ... logger config etc server ... ... logger config etc server tracer
36. logger config etc logger ... ... ... tracer server
38. logger config etc logger ... ... ... tracer server
39. logger config etc logger ... ... tracer server
40. logger config etc logger ... ... tracer server
41. logger config etc logger ... ... tracer server
42. logger config etc logger ... ... tracer server
43. DI GRAB & GO •
49. di.NewApp( di.defaults, // ... ).Run()
50. di.NewApp( di.defaults, // ... ).Run()
51. ...
52. tracer := tracing.New(logger, config)
53. tracer := tracing.New(logger, config)
54. server := lib.NewServer( lib.WithTracer(tracer), )
55. server := lib.NewServer( lib.WithTracer(tracer), )
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68. package uberfx var Module = fx.Options( configfx, loggerfx, tracingfx, ... ) package main func main() { fx.New( uberfx.Module, ... ).Run() } github.com/uber-go/fx
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71. REST
72. REST gRPC
73. REST gRPC
74. Rewrite REST gRPC
76. •
77. REST gRPC
78. REST gRPC
79. Handlers . . .
80. Controllers Handlers . . .
81. Controllers Handlers . . .
82. Controllers Handlers . . . http.Request pb.GetTrip ... Get Trip Request
83. Controllers Handlers . . .
84. Repositories Controllers Handlers . . .
85. Repositories Controllers Gateways Handlers . . .
86. Repositories . . .
87. Repositories . . . Controllers List Users Request SELECT * FROM mysql;
88. Repositories . . . Controllers List Users Request SELECT * FROM mysql; SELECT * FROM cassandra;
89. Repositories . . . Controllers List Users Request SELECT * FROM mysql; SELECT * FROM cassandra;
90. Repositories . . . Controllers List Users Request SELECT * FROM cassandra;
91. Gateways . . .
92. Gateways . . . Controllers Charge Payment Request http.Request
93. Gateways . . . Controllers Charge Payment Request http.Request pb.Request
94. Gateways . . . Controllers Charge Payment Request http.Request pb.Request
95. Gateways . . . Controllers Charge Payment Request pb.Request
96. Repositories Controllers Gateways Handlers . . .
97. Repositories Controllers Gateways Handlers . . .
98. Repositories Controllers Gateways Handlers . . .
99. Repositories Controllers Gateways Handlers . . .
100. Repositories Controllers Gateways Handlers . . .
103. ├── app ├── controller ├── entity ├── gateway ├── gen │ └── [generated goodies] ├── handler └── repository $ glue new service
104. • • ├── app ├── controller ├── entity ├── gateway ├── gen │ └── [generated goodies] ├── handler └── repository
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140. https://github.com/MariaLetta/free-gophers-pack