Go Crazy: A Fun Projects-based Approach to Golang Programming

Table of Contents....5 About the Author....10 About the Technical Reviewer....11 Acknowledgments....12 Introduction....13 Chapter 1: Go to the Basics....16 First Steps....17 Run and Debug Your First Go Program....17 A Short Note on Debugging with GoLand....23 Before Talking to OpenAI: Reviewing Concepts....25 Read from Input....27 Reading from a File....28 Custom Data: Go Structs....29 Writing and Reading Structs from Files....32 Reading a Struct from a File....34 Slicing Program Arguments....35 Using a Custom Library to Load the API Key....36 Asynchronous Code: Go Routines....40 Asynchronous Code: Go Routines and Channels....40 Using Go Contexts....45 Putting Things Together Into a ChatGPT Client....49 Getting an API Key....49 First Request....51 Customize the ChatGPT Request....53 Create a Loop Prompt....56 Streaming the Response....57 Query and Use a Custom Model....58 Summary....60 Chapter 2: Write a Tested HTTP Image Generator API....62 Pour Me Some Gin!....63 Working with Queues....71 Image Generators....82 Image Generator in a Gin....86 Quick Gin Tonic and Templates....91 Use a Synchronized Map....95 Testing the API....99 Simple Go and Gin Testing....99 Testing the Image Generator....105 Summary....107 Chapter 3: Writing the Basics for a 2D Game in Go....108 Some Tile Set History....108 Library Setup: Raylib....109 Game Setup....110 Quick Game Generation with ChatGPT....112 Display the Date in Real Time....112 Hangman Game....115 The Moyashi Game....118 The Basic Game Loop....120 Loading Textures....122 Adding a Player Texture....125 Using Key Inputs....128 Doing the Game Music....130 Game Camera....133 Animate Sprites....136 Animation for an Idle Moyashi....141 Loading the World Map....142 Loading the Full World Map....146 Full Map and Full Screen....152 Summary....153 Chapter 4: Trend Follower for Blockchain Trading....154 Go Crazy or Go Home....154 Why Trade in the Financial Markets?....156 The Origins of Money....156 The Financial Economy vs. the Real Economy....157 Market Efficiency....158 Why Automate Trading?....159 The Secret Sauce....162 Charts....163 Data....163 News and Content....163 Strategy....164 Backtesting....164 Real-Time Trading....164 The Recipe....165 Clear Objectives and a Structured Approach....165 Macroeconomic Tendencies....166 Timeframe....167 Risk Management....167 Testing and Debugging....167 Performance Evaluation....168 Scalability and Maintainability....168 Compliance and Regulation....168 Security....169 Building Confidence....169 Refining Trading Strategies....170 Utensils in the Kitchen....170 Modern Trading Tool....170 Brokers....174 Cloud Infrastructure....174 Cooking....175 Backtesting....175 Data....176 Indicators....178 Levels....178 Simple Moving Averages....181 Exponential Moving Averages....182 Relative Strength Index....182 Additional Notes....183 Enhancing Discipline and Consistency....184 Why So Many Features?....184 Sample Code....185 Exchange Connectivity (Listing 4-1)....185 Building Indicators (Listing 4-2)....186 The Strategy....187 Run the Bot....189 Performance Evaluation....190 Stats....190 PnL....190 PnL in Backtesting....190 PnL in Real-Time Testing....191 Hit Rate....191 Hit Rate in Trading Strategy Evaluation....192 The Potential Drawbacks of an Excessively High Hit Rate....192 Sharpe Ratio....193 Risk-Adjusted Performance....193 Benchmarking and Comparison....193 Portfolio Diversification....193 Potential Pitfalls....194 MAR Ratio....195 Emphasis on Drawdown Risk....195 Risk-Adjusted Performance....195 Comparison of Strategies....196 Suitability for Trend-Following Strategies....196 Potential Pitfalls....196 Success or Failure and Why....198 Benchmark Comparison....198 Timeframe....198 Risk Management and Continuous Improvement....199 Potential Pitfalls....199 Example of Backtesting Multiple Strategies....199 A Taste Before Serving the Meal....202 Ensuring System Stability....203 Hidden Difficulties....203 Forensic Analysis....203 Potential Pitfalls....205 Dinner Is Served....208 Skin in the Game....209 Fear vs. Greed....209 Which Products to Trade....210 Machine Learning....211 Dessert!....212 The Exponential Age Is Here....212 The Proverbial “Cherry on Top”....213 Appendix....219 Finance Jargon....219 Glossary....219 One-liner....222 Extra Indicators of Interest....223 Tom Demark’s Indicators....223 Extra Statistics....223 Side Notes on Geth....225 Ethereum’s GoLang Implementation: Geth....225 GoLang’s Advantages for Blockchain Development....225 References....226 Chapter 5: Writing a Kubernetes Operator to Run EVM-Compatible Blockchains....228 Setting Up Kubernetes on Your Machine....229 Resources Overview....231 Let’s Run a Pod....233 Demystifying Kubernetes Operators....234 Custom Resource Definition....235 Controller....237 Bootstrapping the Project with Operator-SDK....237 Creating an API....238 Generating the Manifests....240 Configuring the Makefile....240 Implementing the Operator Reconciliation Logic....242 Using the Kubernetes Go SDK....252 Interacting with the JSON-RPC API....261 Using Port-Forward....262 Parameterizing Resources and Ports....263 Implementing the Update Logic....265 Implementing Health Checks....273 Creating a Minimal Go HTTP Server....274 Performing a net_peerCount Health Check....277 Configuring the Readiness Probe....281 Summary....283 Chapter 6: Go Beyond: Connecting to C for a Performance Boost....285 C is for Change....286 Calling C....286 Calling C Code Located in a C File....287 C Code Calling Go Code....288 Passing Parameters....289 Using a Header File....291 Using a C Struct from Go....292 Matisse, ImageMagick, and Sepia....298 ImageMagick on OSX....299 ImageMagick on Linux....302 ImageMagick on Raspberry Pi....302 GPU Coding on OSX....303 Basics: Adding Values from Two Arrays....304 Back to the Plot....308 Generic GPU Processing Go Code....311 Opens ETHUSD Hourlies Quotes: Moving Average....313 Slightly Better Moving Average on the GPU....314 Normalized Set....316 Pearson Coefficient Moving Factor....318 Sepia Gopher....321 Extreme Calling OpenCV/C++ from Go....323 Summary....329 Chapter 7: Alef from Plan 9....330 Plan 9 from Bell Labs....332 The Network Is the Computer....334 The Alef Language....336 Hello Tuple!....337 Channels and Processes....337 Proc and Task....339 Have Fun with Plan 9....343 Index....372