دستورهای گو: رویکردی مبتنی بر مشکل و راه‌حل

Solve your Go problems using a problem-solution approach. Each recipe is a self-contained answer to a practical programming problem in Go. Go Recipes contains recipes that deal with the fundamentals of Go, allowing you to build simple, reliable, and efficient software. Other topics include working with data using modern NoSQL databases such as MongoDB and RethinkDB. The book provides in-depth guidance for building highly scalable backend APIs in Go for your mobile client applications and web client applications. All this means that you'll be able to write programs that get the most out of multicore and networked machines, using Go's novel type system that enables flexible and modular program construction. You'll see how to test your Go applications so they are ready for deployment, as well as learning how to write HTTP servers to offer you maximum flexibility when dealing with remote clients. What You'll Learn Work with the core fundamentals of Go Persist data into NoSQL databases Build scalable backend APIs Test your Go applications Create HTTP web servers in Go Who This Book Is For Experienced programmers who have some or no prior experience with Go. Contents at a Glance......Page 5 Contents......Page 6 About the Author......Page 14 About the Technical Reviewer......Page 15 Introduction......Page 16 Introduction to Go......Page 17 How It Works......Page 18 Setting Up the Go Workspace......Page 21 How It Works......Page 22 How It Works......Page 24 How It Works......Page 26 Compiling the Package......Page 28 How It Works......Page 30 How It Works......Page 31 Formatting Go Code......Page 32 Vetting Go Code for Common Errors......Page 33 Go Documentation with GoDoc......Page 34 Problem......Page 35 Writing an Example Package......Page 36 Reusing Packages......Page 38 Using a Blank Identifier as a Package Alias......Page 40 Installing Third-Party Packages......Page 41 Declaring Functions......Page 42 Returning Multiple Values......Page 44 Variadic Functions......Page 45 Function Values, Anonymous Functions, and Closures......Page 46 Declaring and Initializing Arrays......Page 48 Iterating over Arrays......Page 49 Example Program......Page 50 Initializing Slices Using make Function......Page 52 Creating Slices Using a Slice Literal......Page 53 Enlarging Slices with copy and append Functions......Page 54 How It Works......Page 56 Working with Maps......Page 57 Iteration Order of Maps......Page 59 How It Works......Page 60 How It Works......Page 61 How It Works......Page 62 Solution......Page 63 How It Works......Page 64 How It Works......Page 67 Creating Instances of Struct Types......Page 68 Using User-Defined Types as the Type for Fields......Page 69 How It Works......Page 70 How It Works......Page 76 How It Works......Page 81 Implementing an Interface into Concrete Types......Page 82 How It Works......Page 89 Problem......Page 93 How It Works......Page 94 Communication with Channels......Page 95 Deadlock......Page 98 Example Program......Page 99 Receive Values Using Range Expression......Page 102 Solution......Page 103 How It Works......Page 104 Example with Channel Direction......Page 107 Solution......Page 108 How It Works......Page 109 How It Works......Page 113 Encoding JSON......Page 117 Decoding JSON......Page 118 Example: Encoding and Decoding......Page 119 Example: Encoding and Decoding with Struct Tags......Page 120 How It Works......Page 122 Example: A Basic Logger......Page 125 Example: A Configurable Logger......Page 128 io.Writer and io.Reader Interfaces......Page 132 Writing and Reading Tar Files......Page 133 Writing and Reading Zip Files......Page 138 How It Works......Page 142 Connecting to MongoDB......Page 143 Performing CRUD Operations......Page 144 Delete a Document from a Collection......Page 147 Read Documents from a Collection......Page 148 Solution......Page 154 Connecting to RethinkDB......Page 155 Performing CRUD Operations......Page 156 Update a Document in a Table......Page 158 Read a Document from a Table......Page 159 Changefeeds in RethinkDB......Page 165 Solution......Page 166 Line Protocol......Page 167 Working on InfluxDB with Go Client......Page 168 Connecting to InfluxDB......Page 169 Reading Points from InfluxDB......Page 170 Example: Writing and Reading on InfluxDB......Page 171 Working with PostgreSQL......Page 175 Working with MySQL......Page 176 Example with PostgreSQL Database......Page 177 Chapter 7: Building HTTP Servers......Page 181 How It Works......Page 182 Problem......Page 186 How It Works......Page 187 How It Works......Page 188 How It Works......Page 190 How It Works......Page 191 Solution......Page 192 How It Works......Page 193 How It Works......Page 195 Directory Structure of the Application......Page 196 Data Model......Page 198 Configuring REST API Resources into the HTTP Multiplexer......Page 199 Managing mgo.Session......Page 201 HTTP Handlers for Bookmarks Resource......Page 203 Data Persistence with MongoDB......Page 210 Running the HTTP Server......Page 211 Testing REST API Server......Page 213 How It Works......Page 216 Running Unit Tests......Page 218 Solution......Page 219 How It Works......Page 220 Problem......Page 221 How It Works......Page 222 How It Works......Page 223 How It Works......Page 225 How It Works......Page 227 An HTTP API Server......Page 228 Testing HTTP Applications Using ResponseRecorder......Page 229 Testing HTTP Application Using Server......Page 230 Building a Testable HTTP API Server......Page 232 Bootstrapping a Test Suite File......Page 237 Adding Specs to Suite......Page 238 Writing Specs in Test File......Page 239 Index......Page 246 Go Recipes: A Problem-Solution Approach provides an invaluable reference to using the Go programming language, showing idiomatic and best practice code for solving common problems encountered by developers in all industries. What you'll learn " Core fundamentals of Go programming language." How to persist data into relational databases and into NoSQL databases." How to build scalable backend APIs in Go." How to build and deploy Go web applications into multiple Cloud platforms." Building Microservices in the container era Résumé : For experienced programmers who have some or no prior experience with Go, this in-depth guide contains recipes that deal with the fundamentals of Go, allowing you to build simple, reliable, and efficient software. -- Edited summary from book