Network Programming with Go Language: Essential Skills for Programming, Using and Securing Networks with Open Source Google Golang

Length: 402 pages
Edition: 2
Language: English
Publisher: Apress
Publication Date: 2022-07-08
ISBN-10: 1484280946
ISBN-13: 9781484280942
Sales Rank: #586677 (See Top 100 Books)

Dive into key topics in network architecture implemented with the Google-backed open source Go programming language. Networking topics such as data serialization, application level protocols, character sets and encodings are discussed and demonstrated in Go. This book has been updated to the Go version 1.18 which includes modules, generics, and fuzzing along with updated and additional examples.

Beyond the fundamentals, Network Programming with Go, Second Edition covers key networking and security issues such as HTTP protocol changes, validation and templates, remote procedure call (RPC) and REST comparison, and more. Additionally, authors Ronald Petty and Jan Newmarch guide you in building and connecting to a complete web server based on Go. Along the way, use of a Go web toolkit (Gorilla) will be employed.

This book can serve as both an essential learning guide and reference on networking concepts and implementation in Go. Free source code is available on Github for this book under Creative Commons open source license.

What You Will Learn

Perform network programming with Go (including JSON and RPC)
Understand Gorilla, the Golang web toolkit, and how to use it
Implement a microservice architecture with Go
Leverage Go features such as generics, fuzzing
Master syscalls and how to employ them with Go

Who This Book Is For
Anyone interested in learning networking concepts implemented in modern Go. Basic knowledge in Go is assumed, however, the content and examples in this book are approachable with modest development experience in other languages.

Table of Contents
About the Authors
About the Technical Reviewer
Acknowledgments
Preface to the Second Edition
Preface to the First Edition
Chapter 1: Architectural Layers
    Protocol Layers
        ISO OSI Protocol
        OSI Layers
        TCP/IP Protocol
        Some Alternative Protocols
    Networking
    Gateways
    Host-Level Networking
    Packet Encapsulation
    Connection Models
        Connection Oriented
        Connectionless
    Communications Models
        Message Passing
        Remote Procedure Call
    Distributed Computing Models
    Client-Server System
    Client-Server Application
    Server Distribution
    Communication Flows
        Synchronous Communication
        Asynchronous Communication
        Streaming Communication
        Publish/Subscribe
    Component Distribution
        Gartner Classification
            Example: Distributed Database
            Example: Network File Service
            Example: Web
            Example: Terminal Emulation
            Example: Secure Shell
        Three-Tier Models
        Fat vs. Thin
    Middleware Model
        Middleware Examples
        Middleware Functions
    Continuum of Processing
    Points of Failure
    Acceptance Factors
    Thoughts on Distributed Computing
    Transparency
        Access Transparency
        Location Transparency
        Migration Transparency
        Replication Transparency
        Concurrency Transparency
        Scalability Transparency
        Performance Transparency
        Failure Transparency
    Eight Fallacies of Distributed Computing
        Fallacy: The Network Is Reliable
        Fallacy: Latency Is Zero
        Fallacy: Bandwidth Is Infinite
        Fallacy: The Network Is Secure
        Fallacy: Topology Doesn’t Change
        Fallacy: There Is One Administrator
        Fallacy: Transport Cost Is Zero
        Fallacy: The Network Is Homogeneous
    Conclusion
Chapter 2: Overview of the Go Language
    Types
        Slices and Arrays
        Maps
        Pointers
        Functions
        Structures
        Methods
    Multithreading
    Packages
    Modules
    Type Conversion
    Statements
    GOPATH
    Running Go Programs
    Standard Libraries
    Error Values
    Conclusion
Chapter 3: Socket-Level Programming
    The TCP/IP Stack
        IP Datagrams
        UDP
        TCP
    Internet Addresses
        IPv4 Addresses
        IPv6 Addresses
    IP Address Type
    Using Available Documentation and Examples
        The IPMask Type
        Basic Routing
        The IPAddr Type
        Host Canonical Name and Addresses Lookup
    Services
        Ports
        The TCPAddr Type
    TCP Sockets
        TCP Client
        A Daytime Server
        Multithreaded Server
    Controlling TCP Connections
        Timeout
        Staying Alive
    UDP Datagrams
    Server Listening on Multiple Sockets
    The Conn, PacketConn, and Listener Types
    Raw Sockets and the IPConn Type
    Conclusion
Chapter 4: Data Serialization
    Structured Data
    Mutual Agreement
    Self-Describing Data
    Encoding Packages
    ASN.1
        ASN.1 Daytime Client and Server
    JSON
        A Client and A Server
    The Gob Package
        A Client and A Server
    Encoding Binary Data As Strings
    Protocol Buffers
        Installing and Compiling Protocol Buffers
        The Generated personv3.pb.go File
        Using the Generated Code
    Conclusion
Chapter 5: Application-Level Protocols
    Protocol Design
    Why Should You Worry?
    Version Control
        The Web
    Message Format
    Data Format
        Byte Format
        Character Format
    A Simple Example
        A Stand-Alone Application
        The Client-Server Application
        The Client Side
        Alternative Presentation Aspects
        The Server Side
        Protocol: Informal
        Text Protocol
        Server Code
        Client Code
        Textproto Package
    State Information
        Application State Transition Diagram
        Client-State Transition Diagrams
        Server-State Transition Diagrams
        Server Pseudocode
    Conclusion
Chapter 6: Managing Character Sets and Encodings
    Definitions
        Character
        Character Repertoire/Character Set
        Character Code
        Character Encoding
        Transport Encoding
    ASCII
    ISO 8859
    Unicode
    UTF-8, Go, and Runes
        UTF-8 Client and Server
        ASCII Client and Server
    UTF-16 and Go
        Little-Endian and Big-Endian
        UTF-16 Client and Server
    Unicode Gotchas
    ISO 8859 and Go
    Other Character Sets and Go
    Conclusion
Chapter 7: Security
    ISO Security Architecture
        Functions and Levels
        Mechanisms
    Data Integrity
    Symmetric Key Encryption
    Public Key Encryption
    X.509 Certificates
    TLS
        A Basic Client
        Server Using a Self-Signed Certificate
    Conclusion
Chapter 8: HTTP
    URLs and Resources
        i18n
        HTTP Characteristics
        Versions
        HTTP/0.9
            Response Format
        HTTP/1.0
            Request Format
            Response Format
        HTTP 1.1
        HTTP Major Upgrades
        HTTP/2
        HTTP/3
    Simple User Agents
        The Response Type
        The HEAD Method
        The GET Method
    Configuring HTTP Requests
    The Client Object
    Proxy Handling
        Simple Proxy
        Authenticating Proxy
    HTTPS Connections by Clients
    Servers
        File Server
        Handler Functions
        Bypassing the Default Multiplexer
    HTTPS
    Conclusion
Chapter 9: Templates
    Inserting Object Values
        Using Templates
    Pipelines
    Defining Functions
    Variables
    Conditional Statements
    The html/template Package
    Conclusion
Chapter 10: A Complete Web Server
    Browser Site Diagram
    Browser Files
    Basic Server
    The listFlashCards Function
    The manageFlashCards Function
    The Chinese Dictionary
        The Dictionary Type
    Flashcard Sets
    Fixing Accents
    The ListWords Function
    The showFlashCards Function
    Presentation on the Browser
    Running the Server
    Conclusion
Chapter 11: HTML
    The html/template Package
    Tokenizing HTML
    XHTML/HTML
    JSON
    Conclusion
Chapter 12: XML
    Unmarshalling XML
    Marshalling XML
    Parsing XML
        The StartElement Type
        The EndElement Type
        The CharData Type
        The Comment Type
        The ProcInst Type
        The Directive Type
    XHTML
    HTML
    Conclusion
Chapter 13: Remote Procedure Call
    Go’s RPC
        HTTP RPC Server
        HTTP RPC Client
        TCP RPC Server
        TCP RPC Client
        Matching Values
    JSON
        JSON RPC Server
        JSON RPC Client
    Conclusion
Chapter 14: REST
    URIs and Resources
    Representations
    REST Verbs
        The GET Verb
        The PUT Verb
        The DELETE Verb
        The POST Verb
    No Maintained State (That Is, Stateless)
    HATEOAS
    Representing Links
    Transactions with REST
    The Richardson Maturity Model
    Flashcards Revisited
        URLs
    ServeMux (The Demultiplexer)
    Content Negotiation
        GET /
        POST /
    Handling Other URLs
    The Complete Server
    Client
    Using REST or RPC
    Conclusion
Chapter 15: WebSockets
    WebSockets Server
    The golang.org/x/net/websocket Package
        The Message Object
        The JSON Object
        The Codec Type
        WebSockets over TLS
        WebSockets in an HTML Page
    The github.com/gorilla/websocket Package
        Echo Server
        Echo Client
    Conclusion
Chapter 16: Gorilla
    Middleware Pattern
    Standard Library ServeMux Examples
    Customizing Muxes
    gorilla/mux
    Why Should We Care
    Gorilla Handlers
    Additional Gorilla Examples
    gorilla/rpc
    gorilla/schema
    gorilla/securecookie
    Conclusion
Chapter 17: Testing
    Simple and Broken
    httptest Package
    Below HTTP
    Leveraging the Standard Library
    Conclusion
Appendix A: Fuzzing
    Fuzzing in Go
    Fuzzing Failures
    Fuzzing Network-Related Artifacts
    Conclusion
Appendix B: Generics
    A Filtering Function Without Generics
    Refactor Using Generics
    Custom Constraints
    Using Generics on Collections
    How Not to Use Generics?
    Conclusion
Index

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