Take you ten days to easily complete the go micro service series (IX. link tracking)

preface

We will show you one in detail through a series of articles go-zero Microservice example , The whole series is divided into ten articles , The directory structure is as follows ：

1. Environment building
2. Service split
3. Customer service
4. Product service
5. Order service
6. Payment services
7. RPC service Auth verification
8. Service monitoring
9. Link tracking （ this paper ）
10. Distributed transactions

I hope this series will take you to use it locally Docker Environmental utilization go-zero Quickly develop a mall system , Let you get started with micro services quickly .

Complete sample code ：https://github.com/nivin-studio/go-zero-mall

First , Let's take a look at the overall service split diagram ：

9.1 Jaeger Introduce

Jaeger yes Uber Develop and open source a distributed tracking system , compatible OpenTracing API, For the following scenarios ：

• Distributed tracking information transfer
• Distributed transaction monitoring
• Problem analysis
• Service dependency analysis
• performance optimization

Jaeger The full link tracking function of is mainly completed by three roles :

• client： Be responsible for the timing of each call point on the whole chain 、 sampling , And will tracing The data is sent locally agent.
• agent： Responsible for collection client It's from tracing data , And thrift The agreement is forwarded to collector.
• collector： Responsible for collecting all agent Reported tracing data , Unified storage .

9.2 go-zero  Use  Jaeger  Link tracking

go-zero  The framework has helped us realize link tracking （ See ：go-zero Link tracking ）, And the integration supports Jaeger, Zipkin These two link tracking and reporting tools , We just need a simple configuration , You can visually view the complete call chain of a request , And the call and performance of each link .

9.2.1 add to user api service Telemetry To configure

$ vim mall/service/user/api/etc/user.yaml

Name: User
Host: 0.0.0.0
Port: 8000

...

Telemetry:
  Name: user.api
  Endpoint: http://jaeger:14268/api/traces
  Sampler: 1.0
  Batcher: jaeger

9.2.2 add to user rpc service Telemetry To configure

$ vim mall/service/user/rpc/etc/user.yaml

Name: user.rpc
ListenOn: 0.0.0.0:9000

...

Telemetry:
  Name: user.rpc
  Endpoint: http://jaeger:14268/api/traces
  Sampler: 1.0
  Batcher: jaeger

9.2.3 add to product api service Telemetry To configure

$ vim mall/service/product/api/etc/product.yaml

Name: Product
Host: 0.0.0.0
Port: 8001

...

Telemetry:
  Name: product.api
  Endpoint: http://jaeger:14268/api/traces
  Sampler: 1.0
  Batcher: jaeger

9.2.4 add to product rpc service Telemetry To configure

$ vim mall/service/product/rpc/etc/product.yaml

Name: product.rpc
ListenOn: 0.0.0.0:9001

...

Telemetry:
  Name: product.rpc
  Endpoint: http://jaeger:14268/api/traces
  Sampler: 1.0
  Batcher: jaeger

9.2.5 add to order api service Telemetry To configure

$ vim mall/service/order/api/etc/order.yaml

Name: Order
Host: 0.0.0.0
Port: 8002

...

Telemetry:
  Name: order.api
  Endpoint: http://jaeger:14268/api/traces
  Sampler: 1.0
  Batcher: jaeger

9.2.6 add to order rpc service Telemetry To configure

$ vim mall/service/order/rpc/etc/order.yaml

Name: order.rpc
ListenOn: 0.0.0.0:9002

...

Telemetry:
  Name: order.rpc
  Endpoint: http://jaeger:14268/api/traces
  Sampler: 1.0
  Batcher: jaeger

9.2.7 add to pay api service Telemetry To configure

$ vim mall/service/pay/api/etc/pay.yaml

Name: Pay
Host: 0.0.0.0
Port: 8003

...

Telemetry:
  Name: pay.api
  Endpoint: http://jaeger:14268/api/traces
  Sampler: 1.0
  Batcher: jaeger

9.2.8 add to pay rpc service Telemetry To configure

$ vim mall/service/pay/rpc/etc/pay.yaml

Name: pay.rpc
ListenOn: 0.0.0.0:9003

...

Telemetry:
  Name: pay.rpc
  Endpoint: http://jaeger:14268/api/traces
  Sampler: 1.0
  Batcher: jaeger

Tips ： After configuration modification , You need to restart the service to take effect .

9.3 Use  Jaeger UI  View link

• visit /api/user/userinfoapi Interface

• stay Chapter one Environment building We integrated  Jaeger  service , And for it Jaeger UI Port number 16686 Made the host port 5000 The mapping relation of , So enter... In the browser  http://127.0.0.1:5000/  visit  Jaeger UI  Interface . choice Search menu , stay Service Select from the drop-down box user.api, Finally, click Find Traces Button , You can query the just accessed /api/user/userinfo Link tracking data of the interface .

• Click in , You can see this /api/user/userinfo Link sequence diagram of interface , And service dependencies , And time consuming .

• Different data display styles can be selected from the drop-down menu in the upper right corner .

• Effect drawing of other interface link tracking

Project address

https://github.com/zeromicro/go-zero

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