Practical Go
Building Scalable Network and Non-Network Applications
Résumé
YOUR PRACTICAL, HANDS-ON GUIDE TO WRITING APPLICATIONS USING GO
Google announced the Go programming language to the public in 2009, with the version 1.0 release announced in 2012. Since its announcement to the community, and the compatibility promise of the 1.0 release, the Go language has been used to write scalable and high-impact software programs ranging from command-line applications and critical infrastructure tools to large-scale distributed systems. It's speed, simplicity, and reliability make it a perfect choice for developers working in various domains.
In Practical Go - Building Scalable Network + Non-Network Applications, you will learn to use the Go programming language to build robust, production-ready software applications. You will learn just enough to building command line tools and applications communicating over HTTP and gRPC.
This practical guide will cover:
- Writing command line applications
- Writing a HTTP services and clients
- Writing RPC services and clients using gRPC
- Writing middleware for network clients and servers
- Storing data in cloud object stores and SQL databases
- Testing your applications using idiomatic techniques
- Adding observability to your applications
- Managing configuration data from your applications
You will learn to implement best practices using hands-on examples written with modern practices in mind. With its focus on using the standard library packages as far as possible, Practical Go will give you a solid foundation for developing large applications using Go leveraging the best of the language's ecosystem.
Introduction xvii
Getting Started xxi
Chapter 1 Writing Command-Line Applications 1
Your First Application 1
Writing Unit Tests 8
Using the Flag Package 14
Testing the Parsing Logic 20
Improving the User Interface 22
Removing Duplicate Error Messages 23
Customizing Usage Message 24
Accept Name via a Positional Argument 25
Updating the Unit Tests 28
Summary 32
Chapter 2 Advanced Command-Line Applications 33
Implementing Sub-commands 33
An Architecture for Sub-command-Driven Applications 37
Testing the Main Package 43
Testing the Cmd Package 45
Making Your Applications Robust 47
User Input with Deadlines 48
Handling User Signals 52
Summary 56
Chapter 3 Writing HTTP Clients 57
Downloading Data 57
Testing the Data Downloader 59
Deserializing Received Data 61
Sending Data 66
Working with Binary Data 72
Summary 80
Chapter 4 Advanced HTTP Clients 81
Using a Custom HTTP Client 81
Downloading from an Overloaded Server 81
Testing the Time-Out Behavior 85
Configuring the Redirect Behavior 88
Customizing Your Requests 91
Implementing Client Middleware 92
Understanding the RoundTripper Interface 93
A Logging Middleware 94
Add a Header to All Requests 96
Connection Pooling 99
Configuring the Connection Pool 103
Summary 104
Chapter 5 Building HTTP Servers 105
Your First HTTP Server 105
Setting Up Request Handlers 108
Handler Functions 109
Testing Your Server 112
The Request Struct 114
Method 115
URL 115
Proto, ProtoMajor, and ProtoMinor 116
Header 116
Host 116
Body 116
Form, PostForm 116
MultipartForm 117
Attaching Metadata to a Request 118
Processing Streaming Requests 121
Streaming Data as Responses 126
Summary 132
Chapter 6 Advanced HTTP Server Applications 133
The Handler Type 133
Sharing Data across Handler Functions 134
Writing Server Middleware 139
Custom HTTP Handler Technique 139
The HandlerFunc Technique 140
Chaining Middleware 142
Writing Tests for Complex Server Applications 147
Code Organization 147
Testing the Handler Functions 153
Testing the Middleware 155
Testing the Server Startup 157
Summary 159
Chapter 7 Production-Ready HTTP Servers 161
Aborting Request Handling 161
Strategies to Abort Request Processing 165
Handling Client Disconnects 169
Server-Wide Time-Outs 173
Implement a Time-Out for All Handler Functions 173
Implementing Server Time-Out 174
Implementing Graceful Shutdown 179
Securing Communication with TLS 184
Configuring TLS and HTTP/2 184
Testing TLS Servers 188
Summary 192
Chapter 8 Building RPC Applications with gRPC 193
gRPC and Protocol Buffers 193
Writing Your First Service 197
Writing the Server 198
Writing a Client 203
Testing the Server 207
Testing the Client 211
A Detour into Protobuf Messages 214
Marshalling and Unmarshalling 214
Forward and Backward Compatibility 219
Multiple Services 220
Error Handling 226
Summary 228
Chapter 9 Advanced gRPC Applications 229
Streaming Communication 229
Server-Side
Streaming 230
Client-Side
Streaming 237
Bidirectional Streaming 239
Receiving and Sending Arbitrary Bytes 247
Implementing Middleware Using Interceptors 256
Client-Side Interceptors 257
Server-Side Interceptors 263
Wrapping Streams 269
Chaining Interceptors 271
Summary 272
Chapter 10 Production-Ready gRPC Applications 275
Securing Communication with TLS 275
Robustness in Servers 278
Implementing Health Checks 278
Handling Runtime Errors 286
Aborting Request Processing 289
Robustness in Clients 297
Improving Connection Setup 298
Handling Transient Failures 300
Setting Time-Outs for Method Calls 305
Connection Management 306
Summary 309
Chapter 11 Working with Data Stores 311
Working with Object Stores 312
Integration with Package Server 313
Testing Package Uploads 323
Accessing Underlying Driver Types 325
Working with Relational Databases 327
Integration with Package Server 328
Testing Data Storage 339
Data Type Conversions 343
Using Database Transactions 346
Summary 348
Appendix A Making Your Applications Observable 349
Logs, Metrics, and Traces 349
Emitting Telemetry Data 352
Command-Line Applications 352
HTTP Applications 360
gRPC Applications 364
Summary 366
Appendix B Deploying Applications 367
Managing Configuration 367
Distributing Your Application 370
Deploying Server Applications 372
Summary 373
Index 375
xiii Contents Introduction xvii Getting Started xxi Chapter 1 Writing Command-Line Applications 1 Your First Application 1 Writing Unit Tests 8 Using the Flag Package 14 Testing the Parsing Logic 20 Improving the User Interface 22 Removing Duplicate Error Messages 23 Customizing Usage Message 24 Accept Name via a Positional Argument 25 Updating the Unit Tests 28 Summary 32 Chapter 2 Advanced Command-Line Applications 33 Implementing Sub-commands 33 An Architecture for Sub-command-Driven Applications 37 Testing the Main Package 43 Testing the Cmd Package 45 Making Your Applications Robust 47 User Input with Deadlines 48 Handling User Signals 52 Summary 56 Chapter 3 Writing HTTP Clients 57 Downloading Data 57 Testing the Data Downloader 59 Deserializing Received Data 61 Sending Data 66 COPYRIGHTED MATERIAL xiv Contents Working with Binary Data 72 Summary 80 Chapter 4 Advanced HTTP Clients 81 Using a Custom HTTP Client 81 Downloading from an Overloaded Server 81 Testing the Time-Out Behavior 85 Configuring the Redirect Behavior 88 Customizing Your Requests 91 Implementing Client Middleware 92 Understanding the RoundTripper Interface 93 A Logging Middleware 94 Add a Header to All Requests 96 Connection Pooling 99 Configuring the Connection Pool 103 Summary 104 Chapter 5 Building HTTP Servers 105 Your First HTTP Server 105 Setting Up Request Handlers 108 Handler Functions 109 Testing Your Server 112 The Request Struct 114 Method 115 URL 115 Proto, ProtoMajor, and ProtoMinor 116 Header 116 Host 116 Body 116 Form, PostForm 116 MultipartForm 117 Attaching Metadata to a Request 118 Processing Streaming Requests 121 Streaming Data as Responses 126 Summary 132 Chapter 6 Advanced HTTP Server Applications 133 The Handler Type 133 Sharing Data across Handler Functions 134 Writing Server Middleware 139 Custom HTTP Handler Technique 139 The HandlerFunc Technique 140 Chaining Middleware 142 Writing Tests for Complex Server Applications 147 Code Organization 147 Testing the Handler Functions 153 Testing the Middleware 155 Testing the Server Startup 157 Summary 159 Contents xv Chapter 7 Production-Ready HTTP Servers 161 Aborting Request Handling 161 Strategies to Abort Request Processing 165 Handling Client Disconnects 169 Server-Wide Time-Outs 173 Implement a Time-Out for All Handler Functions 173 Implementing Server Time-Out 174 Implementing Graceful Shutdown 179 Securing Communication with TLS 184 Configuring TLS and HTTP/2 184 Testing TLS Servers 188 Summary 192 Chapter 8 Building RPC Applications with gRPC 193 gRPC and Protocol Buffers 193 Writing Your First Service 197 Writing the Server 198 Writing a Client 203 Testing the Server 207 Testing the Client 211 A Detour into Protobuf Messages 214 Marshalling and Unmarshalling 214 Forward and Backward Compatibility 219 Multiple Services 220 Error Handling 226 Summary 228 Chapter 9 Advanced gRPC Applications 229 Streaming Communication 229 Server-Side Streaming 230 Client-Side Streaming 237 Bidirectional Streaming 239 Receiving and Sending Arbitrary Bytes 247 Implementing Middleware Using Interceptors 256 Client-Side Interceptors 257 Server-Side Interceptors 263 Wrapping Streams 269 Chaining Interceptors 271 Summary 272 Chapter 10 Production-Ready gRPC Applications 275 Securing Communication with TLS 275 Robustness in Servers 278 Implementing Health Checks 278 Handling Runtime Errors 286 Aborting Request Processing 289 xvi Contents Robustness in Clients 297 Improving Connection Setup 298 Handling Transient Failures 300 Setting Time-Outs for Method Calls 305 Connection Management 306 Summary 309 Chapter 11 Working with Data Stores 311 Working with Object Stores 312 Integration with Package Server 313 Testing Package Uploads 323 Accessing Underlying Driver Types 325 Working with Relational Databases 327 Integration with Package Server 328 Testing Data Storage 339 Data Type Conversions 343 Using Database Transactions 346 Summary 348 Appendix A Making Your Applications Observable 349 Logs, Metrics, and Traces 349 Emitting Telemetry Data 352 Command-Line Applications 352 HTTP Applications 360 gRPC Applications 364 Summary 366 Appendix B Deploying Applications 367 Managing Configuration 367 Distributing Your Application 370 Deploying Server Applications 372 Summary 373 Index 375 NOTE A glossary of relevant terms is available for free download from the book's web page: https://www.wiley.com/go/practicalgo.xiii Contents Introduction xvii Getting Started xxi Chapter 1 Writing Command-Line Applications 1 Your First Application 1 Writing Unit Tests 8 Using the Flag Package 14 Testing the Parsing Logic 20 Improving the User Interface 22 Removing Duplicate Error Messages 23 Customizing Usage Message 24 Accept Name via a Positional Argument 25 Updating the Unit Tests 28 Summary 32 Chapter 2 Advanced Command-Line Applications 33 Implementing Sub-commands 33 An Architecture for Sub-command-Driven Applications 37 Testing the Main Package 43 Testing the Cmd Package 45 Making Your Applications Robust 47 User Input with Deadlines 48 Handling User Signals 52 Summary 56 Chapter 3 Writing HTTP Clients 57 Downloading Data 57 Testing the Data Downloader 59 Deserializing Received Data 61 Sending Data 66 COPYRIGHTED MATERIAL xiv Contents Working with Binary Data 72 Summary 80 Chapter 4 Advanced HTTP Clients 81 Using a Custom HTTP Client 81 Downloading from an Overloaded Server 81 Testing the Time-Out Behavior 85 Configuring the Redirect Behavior 88 Customizing Your Requests 91 Implementing Client Middleware 92 Understanding the RoundTripper Interface 93 A Logging Middleware 94 Add a Header to All Requests 96 Connection Pooling 99 Configuring the Connection Pool 103 Summary 104 Chapter 5 Building HTTP Servers 105 Your First HTTP Server 105 Setting Up Request Handlers 108 Handler Functions 109 Testing Your Server 112 The Request Struct 114 Method 115 URL 115 Proto, ProtoMajor, and ProtoMinor 116 Header 116 Host 116 Body 116 Form, PostForm 116 MultipartForm 117 Attaching Metadata to a Request 118 Processing Streaming Requests 121 Streaming Data as Responses 126 Summary 132 Chapter 6 Advanced HTTP Server Applications 133 The Handler Type 133 Sharing Data across Handler Functions 134 Writing Server Middleware 139 Custom HTTP Handler Technique 139 The HandlerFunc Technique 140 Chaining Middleware 142 Writing Tests for Complex Server Applications 147 Code Organization 147 Testing the Handler Functions 153 Testing the Middleware 155 Testing the Server Startup 157 Summary 159 Contents xv Chapter 7 Production-Ready HTTP Servers 161 Aborting Request Handling 161 Strategies to Abort Request Processing 165 Handling Client Disconnects 169 Server-Wide Time-Outs 173 Implement a Time-Out for All Handler Functions 173 Implementing Server Time-Out 174 Implementing Graceful Shutdown 179 Securing Communication with TLS 184 Configuring TLS and HTTP/2 184 Testing TLS Servers 188 Summary 192 Chapter 8 Building RPC Applications with gRPC 193 gRPC and Protocol Buffers 193 Writing Your First Service 197 Writing the Server 198 Writing a Client 203 Testing the Server 207 Testing the Client 211 A Detour into Protobuf Messages 214 Marshalling and Unmarshalling 214 Forward and Backward Compatibility 219 Multiple Services 220 Error Handling 226 Summary 228 Chapter 9 Advanced gRPC Applications 229 Streaming Communication 229 Server-Side Streaming 230 Client-Side Streaming 237 Bidirectional Streaming 239 Receiving and Sending Arbitrary Bytes 247 Implementing Middleware Using Interceptors 256 Client-Side Interceptors 257 Server-Side Interceptors 263 Wrapping Streams 269 Chaining Interceptors 271 Summary 272 Chapter 10 Production-Ready gRPC Applications 275 Securing Communication with TLS 275 Robustness in Servers 278 Implementing Health Checks 278 Handling Runtime Errors 286 Aborting Request Processing 289 xvi Contents Robustness in Clients 297 Improving Connection Setup 298 Handling Transient Failures 300 Setting Time-Outs for Method Calls 305 Connection Management 306 Summary 309 Chapter 11 Working with Data Stores 311 Working with Object Stores 312 Integration with Package Server 313 Testing Package Uploads 323 Accessing Underlying Driver Types 325 Working with Relational Databases 327 Integration with Package Server 328 Testing Data Storage 339 Data Type Conversions 343 Using Database Transactions 346 Summary 348 Appendix A Making Your Applications Observable 349 Logs, Metrics, and Traces 349 Emitting Telemetry Data 352 Command-Line Applications 352 HTTP Applications 360 gRPC Applications 364 Summary 366 Appendix B Deploying Applications 367 Managing Configuration 367 Distributing Your Application 370 Deploying Server Applications 372 Summary 373 Index 375 NOTE A glossary of relevant terms is available for free download from the book's web page: https://www.wiley.com/go/practicalgo.Amit Saha is a software engineer at Atlassian, located in Sydney, Australia. He has written Doing Math with Python: Use Programming to Explore Algebra, Statistics, Calculus, and More! (No Starch Press, 2015) and Write Your First Program (PHI Learning, 2013). His other writings have been published in technical magazines, conference proceedings, and research journals. He can be found online at https://echorand.me.
L'auteur - Amit Saha
Ingénieur en informatique, Amit Saha a travaillé pour Red Hat et Sun Microsystems. Il a également créé et s'est occupé de la maintenance de Fedora Scientific, un logiciel distribué par Linux pour un usage scientifique et éducationnel.
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Caractéristiques techniques
PAPIER | |
Éditeur(s) | Wiley |
Auteur(s) | Amit Saha |
Parution | 03/03/2022 |
Nb. de pages | 416 |
Couverture | Broché |
EAN13 | 9781119773818 |
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