Cloud Native Go

Spis treści ebooka

• Preface
  • Who Should Read This Book
  • Why I Wrote This Book
  • Conventions Used in This Book
  • Using Code Examples
  • OReilly Online Learning
  • How to Contact Us
  • Acknowledgments
• I. Going Cloud Native
• 1. What Is a Cloud Native Application?
  • The Story So Far
  • What Is Cloud Native?
    • Scalability
    • Loose Coupling
    • Resilience
    • Manageability
    • Observability
  • Why Is Cloud Native a Thing?
  • Summary
• 2. Why Go Rules the Cloud Native World
  • The Motivation Behind Go
  • Features for a Cloud Native World
    • Composition and Structural Typing
    • Comprehensibility
    • CSP-Style Concurrency
    • Fast Builds
    • Linguistic Stability
    • Memory Safety
    • Performance
    • Static Linking
    • Static Typing
  • Summary
• II. Cloud Native Go Constructs
• 3. Go Language Foundations
  • Basic Data Types
    • Booleans
    • Simple Numbers
    • Complex Numbers
    • Strings
  • Variables
    • Short Variable Declarations
    • Zero Values
    • The Blank Identifier
    • Constants
  • Container Types: Arrays, Slices, and Maps
    • Arrays
    • Slices
      • Working with slices
      • The slice operator
      • Strings as slices
    • Maps
      • Map membership testing
  • Pointers
  • Control Structures
    • Fun with for
      • The general for statement
      • Looping over arrays and slices
      • Looping over maps
    • The if Statement
    • The switch Statement
  • Error Handling
    • Creating an Error
  • Putting the Fun in Functions: Variadics and Closures
    • Functions
      • Multiple return values
      • Recursion
      • Defer
      • Pointers as parameters
    • Variadic Functions
      • Passing slices as variadic values
    • Anonymous Functions and Closures
  • Structs, Methods, and Interfaces
    • Structs
    • Methods
    • Interfaces
      • Type assertions
      • The empty interface
    • Composition with Type Embedding
      • Interface embedding
      • Struct embedding
      • Promotion
      • Directly accessing embedded fields
  • The Good Stuff: Concurrency
    • Goroutines
    • Channels
      • Channel blocking
      • Channel buffering
      • Closing channels
      • Looping over channels
    • Select
      • Implementing channel timeouts
  • Summary
• 4. Cloud Native Patterns
  • The Context Package
    • What Context Can Do for You
    • Creating Context
    • Defining Context Deadlines and Timeouts
    • Defining Request-Scoped Values
    • Using a Context
  • Layout of this Chapter
  • Stability Patterns
    • Circuit Breaker
      • Applicability
      • Participants
      • Implementation
      • Sample code
    • Debounce
      • Applicability
      • Participants
      • Implementation
      • Sample code
    • Retry
      • Applicability
      • Participants
      • Implementation
      • Sample code
    • Throttle
      • Applicability
      • Participants
      • Implementation
      • Sample code
    • Timeout
      • Applicability
      • Participants
      • Implementation
      • Sample code
  • Concurrency Patterns
    • Fan-In
      • Applicability
      • Participants
      • Implementation
      • Sample code
    • Fan-Out
      • Applicability
      • Participants
      • Implementation
      • Sample code
    • Future
      • Applicability
      • Participants
      • Implementation
      • Sample code
    • Sharding
      • Applicability
      • Participants
      • Implementation
      • Sample code
  • Summary
• 5. Building a Cloud Native Service
  • Lets Build a Service!
    • Whats a Key-Value Store?
  • Requirements
    • What Is Idempotence and Why Does It Matter?
    • The Eventual Goal
  • Generation 0: The Core Functionality
    • Your Super Simple API
  • Generation 1: The Monolith
    • Building an HTTP Server with net/http
    • Building an HTTP Server with gorilla/mux
      • Creating a minimal service
      • Initializing your project with Go modules
      • Variables in URI paths
      • So many matchers
    • Building a RESTful Service
      • Your RESTful methods
      • Implementing the create function
      • Implementing the read function
    • Making Your Data Structure Concurrency-Safe
      • Integrating a read-write mutex into your application
  • Generation 2: Persisting Resource State
    • Whats a Transaction Log?
      • Your transaction log format
      • Your transaction logger interface
    • Storing State in a Transaction Log File
      • Prototyping your transaction logger
      • Defining the event type
      • Implementing your FileTransactionLogger
      • Creating a new FileTransactionLogger
      • Appending entries to the transaction log
      • Using a bufio.Scanner to play back file transaction logs
      • Your transaction logger interface (redux)
      • Initializing the FileTransactionLogger in your web service
      • Integrating FileTransactionLogger with your web service
      • Future improvements
    • Storing State in an External Database
      • Working with databases in Go
      • Importing a database driver
      • Implementing your PostgresTransactionLogger
      • Creating a new PostgresTransactionLogger
      • Using db.Exec to execute a SQL INSERT
      • Using db.Query to play back postgres transaction logs
      • Initializing the PostgresTransactionLogger in your web service
      • Future improvements
  • Generation 3: Implementing Transport Layer Security
    • Transport Layer Security
      • Certificates, certificate authorities, and trust
    • Private Key and Certificate Files
      • Privacy enhanced mail (PEM) file format
    • Securing Your Web Service with HTTPS
    • Transport Layer Summary
  • Containerizing Your Key-Value Store
    • Docker (Absolute) Basics
      • The Dockerfile
      • Building your container image
      • Running your container image
      • Running your container image
      • Issuing a request to a published container port
      • Running multiple containers
      • Stopping and deleting your containers
    • Building Your Key-Value Store Container
      • Iteration 1: adding your binary to a FROM scratch image
      • Iteration 2: using a multi-stage build
    • Externalizing Container Data
  • Summary
• III. The Cloud Native Attributes
• 6. Its All About Dependability
  • Whats the Point of Cloud Native?
  • Its All About Dependability
  • What Is Dependability and Why Is It So Important?
    • Dependability: Its Not Just for Ops Anymore
  • Achieving Dependability
    • Fault Prevention
      • Good programming practices
      • Language features
      • Scalability
      • Loose coupling
    • Fault Tolerance
    • Fault Removal
      • Verification and testing
      • Manageability
    • Fault Forecasting
  • The Continuing Relevance of the Twelve-Factor App
    • I. Codebase
    • II. Dependencies
    • III. Configuration
    • IV. Backing Services
    • V. Build, Release, Run
    • VI. Processes
    • VII. Data Isolation
    • VIII. Scalability
    • IX. Disposability
    • X. Development/Production Parity
    • XI. Logs
    • XII. Administrative Processes
  • Summary
• 7. Scalability
  • What Is Scalability?
    • Different Forms of Scaling
  • The Four Common Bottlenecks
  • State and Statelessness
    • Application State Versus Resource State
    • Advantages of Statelessness
  • Scaling Postponed: Efficiency
    • Efficient Caching Using an LRU Cache
    • Efficient Synchronization
      • Share memory by communicating
      • Reduce blocking with buffered channels
      • Minimizing locking with sharding
    • Memory Leaks Canfatal error: runtime: out of memory
      • Leaking goroutines
      • Forever ticking tickers
    • On Efficiency
  • Service Architectures
    • The Monolith System Architecture
    • The Microservices System Architecture
    • Serverless Architectures
      • The pros and cons of serverlessness
      • Serverless services
  • Summary
• 8. Loose Coupling
  • Tight Coupling
    • Tight Coupling Takes Many Forms
      • Fragile exchange protocols
      • Shared dependencies
      • Shared point-in-time
      • Fixed addresses
  • Communications Between Services
  • Request-Response Messaging
    • Common Request-Response Implementations
    • Issuing HTTP Requests with net/http
    • Remote Procedure Calls with gRPC
      • Interface definition with protocol buffers
      • Installing the protocol compiler
      • The message definition structure
      • The key-value message structure
      • Defining our service methods
      • Compiling your protocol buffers
      • Implementing the gRPC service
      • Implementing the gRPC client
  • Loose Coupling Local Resources with Plug-ins
    • In-Process Plug-ins with the plugin Package
      • Plug-in vocabulary
      • A toy plug-in example
      • The Sayer interface
      • The Go plugin code
      • Building the plug-ins
      • Using our go plug-ins
        • Import the plugin package
        • Find our plug-in
        • Open our plug-in
        • Look up your symbol
        • Assert and use your symbol
      • Executing our example
    • HashiCorps Go Plug-in System over RPC
      • Another toy plug-in example
      • Common code
        • The Sayer interface
        • The SayerPlugin struct
        • The SayerRPC client implementation
        • The handshake configuration
        • The SayerRPCServer server implementation
      • Our plug-in implementation
      • Our host process
        • Import the hashicorp/go-plugin and commons packages
        • Find our plug-in
        • Create our plug-in client
        • Connect to our plug-in and dispense our Sayer
  • Hexagonal Architecture
    • The Architecture
    • Implementing a Hexagonal Service
      • Our refactored components
      • Our first plug
      • Our core application
      • Our TransactionLogger adapters
      • Our FrontEnd port
      • Putting it all together
  • Summary
• 9. Resilience
  • Keeping on Ticking: Why Resilience Matters
  • What Does It Mean for a System to Fail?
    • Building for Resilience
  • Cascading Failures
    • Preventing Overload
      • Throttling
      • Load shedding
      • Graceful service degradation
  • Play It Again: Retrying Requests
    • Backoff Algorithms
    • Circuit Breaking
    • Timeouts
      • Using Context for service-side timeouts
      • Timing out HTTP/REST client calls
      • Timing out gRPC client calls
    • Idempotence
      • How do I make my service idempotent?
      • What about scalar operations?
  • Service Redundancy
    • Designing for Redundancy
    • Autoscaling
  • Healthy Health Checks
    • What Does It Mean for an Instance to Be Healthy?
    • The Three Types of Health Checks
      • Liveness checks
      • Shallow health checks
      • Deep health checks
    • Failing Open
  • Summary
• 10. Manageability
  • What Is Manageability and Why Should I Care?
  • Configuring Your Application
    • Configuration Good Practice
    • Configuring with Environment Variables
    • Configuring with Command-Line Arguments
      • The standard flag package
      • The Cobra command-line parser
    • Configuring with Files
      • Our configuration data structure
      • Working with JSON
        • Encoding JSON
        • Decoding JSON
        • Field formatting with struct field tags
      • Working with YAML
        • Encoding YAML
        • Decoding YAML
        • Struct field tags for YAML
      • Watching for configuration file changes
        • Making your configuration reloadable
        • Polling for configuration changes
        • Watching OS filesystem notifications
    • Viper: The Swiss Army Knife of Configuration Packages
      • Explicitly setting values in Viper
      • Working with command-line flags in Viper
      • Working with environment variables in Viper
      • Working with configuration files in Viper
        • Reading configuration files
        • Watching and rereading configuration files in Viper
      • Using remote key/value stores with Viper
      • Setting defaults in Viper
  • Feature Management with Feature Flags
    • The Evolution of a Feature Flag
    • Generation 0: The Initial Implementation
    • Generation 1: The Hard-Coded Feature Flag
    • Generation 2: The Configurable Flag
    • Generation 3: Dynamic Feature Flags
      • Dynamic flags as functions
      • Implementing a dynamic flag function
      • The flag function lookup
      • The router function
  • Summary
• 11. Observability
  • What Is Observability?
    • Why Do We Need Observability?
    • How Is Observability Different from Traditional Monitoring?
  • The Three Pillars of Observability
  • OpenTelemetry
    • The OpenTelemetry Components
  • Tracing
    • Tracing Concepts
    • Tracing with OpenTelemetry
      • Creating the tracing exporters
        • The Console Exporter
        • The Jaeger Exporter
      • Creating a tracer provider
      • Setting the global tracer provider
      • Obtaining a tracer
      • Starting and ending spans
      • Setting span metadata
        • Attributes
        • Events
      • Autoinstrumentation
        • Autoinstrumenting net/http and gorilla/mux
        • Autoinstrumenting gRPC
        • Getting the current span from context
    • Putting It All Together: Tracing
      • The Fibonacci service API
      • The Fibonacci service handler
      • The service Main function
      • Starting your services
      • Console exporter output
      • Viewing your results in Jaeger
  • Metrics
    • Push Versus Pull Metric Collection
      • Push-based metric collection
      • Pull-based metric collection
      • But which is better?
    • Metrics with OpenTelemetry
      • Creating the metric exporters
      • Setting the global meter provider
      • Exposing the metrics endpoint
      • Obtaining a meter
      • Metric instruments
        • Synchronous instruments
        • Asynchronous instruments
    • Putting It All Together: Metrics
      • Starting your services
      • Metric endpoint output
      • Viewing your results in Prometheus
  • Logging
    • Better Logging Practices
      • Treat logs as streams of events
      • Structure events for parsing
      • Less is (way) more
      • Dynamic sampling
    • Logging with Gos Standard log Package
      • The special logging functions
      • Logging to a custom writer
      • Log flags
    • The Zap Logging Package
      • Creating a Zap logger
      • Writing logs with Zap
      • Using dynamic sampling in Zap
  • Summary
• Index

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