Microservices & Go - GOTO Copenhagen 2016

1. Microservices & Go Matt Heath, Monzo
3. Hi, I’m Matt @mattheath
7. monoliths traditional dev
17. ?
18. Application
19. Application Database
20. Application Database
21. Application Databases
22. Application Databases Search
23. Application Databases Search Caching
24. Application Databases Search Caching CAT GIFS
25. ALL HAIL THE MONOLITH
27. Application Databases Search Caching CAT GIFS
28. APPLICATION Application
31. Single Responsibility Principle
32. Bounded Context
33. Well defined Interfaces
34. Composability
36. Simple
37. Lightweight Concurrency
38. // Blocking handleRequest()
39. // Runs concurrently // in a goroutine go handleRequest()
40. Go Routines
41. Channels
42. Static Linking
45. monzo/typhon
46. Service Service
47. Service Service Message Bus
48. Service Service Message Bus Request Queue
49. Service Service Message Bus Service Service Request Queue - Service Discovery - Load Balancing
50. Service Service Message Bus Service Service Pull Request Queue
51. Service Service Message Bus Service Service
52. 0 40 80 160 120 Feb 2015 Oct 2016
53. Service Service Message Bus Service Service Client library Server library
54. Service Service Service Service HTTP HTTP
55. Service Discovery Load Balancing Timeouts and Expirations Retries Rate Limiting Connection Pooling Circuit Breaking Failure Detection Metrics and Tracing Interrupts Context Propagation
56. Service Service Service Service HTTP HTTP ?
57. Service Service Service Service HTTP HTTP linkerd
58. Service Discovery Load Balancing Timeouts and Expirations Retries Rate Limiting Connection Pooling Circuit Breaking Failure Detection Metrics and Tracing Interrupts Context Propagation
59. Load Balancer
60. Load Balancer HTTP API & Routing Layer
61. Load Balancer HTTP API & Routing Layer API
 Service
63. /webhooks —-> Webhook API
64. Load Balancer HTTP API & Routing Layer Webhook
 API
65. Auth
 Service Webhook
 Service Load Balancer HTTP API & Routing Layer Webhook
 API
66. Auth
 Service Webhook
 Service Load Balancer HTTP API & Routing Layer Webhook
 API Database
67. Database Auth
 Service Webhook
 Service Load Balancer HTTP API & Routing Layer Webhook
 API Database
68. External Provider Database Auth
 Service Webhook
 Service Load Balancer HTTP API & Routing Layer Webhook
 API Database
69. type Service func(req Request) Response
70. router.GET("/", List) router.POST("/", Register) router.DELETE("/:id", Deregister)
71. Making our service reliable
72. + = ❤
74. Webhook
 Service Webhook
 Service Webhook
 Service Load Balancer HTTP API & Routing Layer Webhook
 API
75. Webhook
 Service Webhook
 Service Webhook
 Service Load Balancer HTTP API & Routing Layer Webhook
 API
76. Webhook
 Service Webhook
 Service Webhook
 Service Webhook
 Service Load Balancer HTTP API & Routing Layer Webhook
 API
77. Webhook
 Service Webhook
 Service Webhook
 Service Webhook
 Service Load Balancer HTTP API & Routing Layer Webhook
 API Slow or
 Errors
78. Event Driven Architecture
79. Service A Service B Load Balancer HTTP API & Routing Layer API Service
80. API Service Service A Service B Load Balancer HTTP API & Routing Layer
81. API Service Service A Service B Load Balancer HTTP API & Routing Layer
82. API Service Service A Service B Load Balancer HTTP API & Routing Layer Service C Service D Service E
83. Context Propagation
84. api api api.customer api.customer service.customer service.customer
85. api api api.customer api.customer service.customer service.customer
86. 8096820c-3b7b-47ec-bce6-1c239252ab40
87. api api api.customer api.customer service.customer service.customer
88. api api api.customer api.customer service.customer service.customer
89. package context type Context interface { Deadline() (deadline time.Time, ok bool) Done() <-chan struct{} Err() error Value(key interface{}) interface{} }
90. package context type Context interface { Deadline() (deadline time.Time, ok bool) Done() <-chan struct{} Err() error Value(key interface{}) interface{} }
91. package context type Context interface { Deadline() (deadline time.Time, ok bool) Done() <-chan struct{} Err() error Value(key interface{}) interface{} }
92. api api api.customer api.customer service.customer service.customer
93. api api api.customer api.customer service.customer service.customer SEND RECV SEND RECV RECV SEND RECV SEND
94. api api.customer service.customer SEND RECV SEND RECV RECV SEND RECV SEND phosphor
96. API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
97. API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
98. API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
99. API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
100. API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
102. API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns API card-api card-processing cards transactions balance transaction-enrichment merchant feed-generator feed apns
107. Small Simple Easy to learn
108. Concurrency Channels
109. Downsides?
110. Starting with Microservices?
111. Thanks! @mattheath @monzo
112. ATM: Thomas Hawk
 Bank of Commerce: ABQ Museum Archives IBM System/360: IBM Absorbed: Saxbald Photography Go Gopher: Renee French Credits