Network Programming with Go : Essential Skills for Using and Securing Networks

1. Architecture -- 2. Overview of the Go language -- 3. Socket-level Programming -- 4. Data Serialization -- 5. Application-Level Protocols -- 6. Managing character sets and encodings -- 7. Security -- 8. HTTP -- 9. Templates -- 10. A Complete Web Server -- 11. HTML -- 12. XML -- 13. Remote Procedure Call -- 14. REST.-15. Web Sockets -- Afterword.;Dive into key topics in network architecture and Go, such as data serialization, application level protocols, character sets and encodings. This book covers network architecture and gives an overview of the Go language as a primer, covering the latest Go release. Beyond the fundamentals, Network Programming with Go covers key networking and security issues such as HTTP and HTTPS, templates, remote procedure call (RPC), web sockets including HTML5 web sockets, and more. Additionally, author Jan Newmarch guides you in building and connecting to a complete web server based on Go. This book can serve as both as an essential learning guide and reference on Go networking. What You Will Learn Master network programming with Go Carry out data serialization Use application-level protocols Manage character sets and encodings Deal with HTTP(S) Build a complete Go-based web server Work with RPC, web sockets, and more Who This Book Is For Experienced Go programmers and other programmers with some experience with the Go language. Contents at a Glance......Page 4 Contents......Page 5 About the Author......Page 16 About the Technical Reviewer......Page 17 Preface......Page 18 Protocol Layers......Page 19 OSI Layers......Page 20 Networking......Page 21 Packet Encapsulation......Page 22 Message Passing......Page 23 Remote Procedure Call......Page 24 Distributed Computing Models......Page 25 Client-Server Application......Page 26 Communication Flows......Page 27 Component Distribution......Page 28 Example: Distributed Database......Page 29 Example: Terminal Emulation......Page 30 Three-Tier Models......Page 31 Middleware Examples......Page 32 Continuum of Processing......Page 33 Acceptance Factors......Page 34 Scalability Transparency......Page 35 Fallacy: The Network Is Reliable......Page 36 Fallacy: There Is One Administrator......Page 37 Conclusion......Page 38 Chapter 2: Overview of the Go Language......Page 39 Structures......Page 40 Functions......Page 41 Methods......Page 42 GOPATH......Page 43 Error Values......Page 44 Conclusion......Page 45 The TCP/IP Stack......Page 46 Internet Addresses......Page 47 IPv6 Addresses......Page 48 IP Address Type......Page 49 The IPMask Type......Page 50 The IPAddr Type......Page 53 Host Lookup......Page 54 Ports......Page 55 The TCPAddr Type......Page 56 TCP Client......Page 57 A Daytime Server......Page 59 Multi-Threaded Server......Page 61 Staying Alive......Page 63 UDP Datagrams......Page 64 The Conn, PacketConn, and Listener Types......Page 66 Raw Sockets and the IPConn Type......Page 69 Conclusion......Page 72 Structured Data......Page 73 Self-Describing Data......Page 75 ASN.1......Page 76 ASN.1 Daytime Client and Server......Page 82 JSON......Page 84 A Client and Server......Page 88 The Gob Package......Page 91 A Client and Server......Page 94 Encoding Binary Data as Strings......Page 97 Protocol Buffers......Page 99 The Compiled personv3.pb.go File......Page 100 Using the Compiled Code......Page 101 Conclusion......Page 102 Protocol Design......Page 103 Version Control......Page 104 The Web......Page 105 Message Format......Page 106 Byte Format......Page 107 A Simple Example......Page 108 A Standalone Application......Page 109 The Client Side......Page 110 Protocol: Informal......Page 111 Text Protocol......Page 112 Server Code......Page 113 Client Code......Page 115 State Information......Page 117 Application State Transition Diagram......Page 119 Client State Transition Diagrams......Page 120 Server Pseudocode......Page 121 Conclusion......Page 122 Chapter 6: Managing Character Sets and Encodings......Page 123 Character Encoding......Page 124 ASCII......Page 125 Unicode......Page 127 UTF-8 Client and Server......Page 128 Little-Endian and Big-Endian......Page 129 UTF-16 Client and Server......Page 130 Unicode Gotchas......Page 132 ISO 8859 and Go......Page 133 Conclusion......Page 135 ISO Security Architecture......Page 136 Functions and Levels......Page 137 Mechanisms......Page 138 Data Integrity......Page 139 Symmetric Key Encryption......Page 141 Public Key Encryption......Page 142 X.509 Certificates......Page 144 A Basic Client......Page 147 Server Using a Self-Signed Certificate......Page 148 Conclusion......Page 151 I18n......Page 152 Response Format......Page 153 Response Format......Page 154 HTTP 1.1......Page 155 The Response Type......Page 156 The HEAD Method......Page 157 The GET Method......Page 158 Configuring HTTP Requests......Page 160 The Client Object......Page 162 Simple Proxy......Page 164 Authenticating Proxy......Page 166 HTTPS Connections by Clients......Page 168 File Server......Page 170 Handler Functions......Page 171 Bypassing the Default Multiplexer......Page 173 HTTPS......Page 174 Conclusion......Page 175 Inserting Object Values......Page 176 Using Templates......Page 177 Pipelines......Page 179 Defining Functions......Page 180 Variables......Page 182 Conditional Statements......Page 183 Conclusion......Page 188 Browser Site Diagram......Page 189 Basic Server......Page 191 The listFlashCards Function......Page 193 The Chinese Dictionary......Page 195 The Dictionary Type......Page 196 Flashcard Sets......Page 197 Fixing Accents......Page 198 The ListWords Function......Page 201 The showFlashCards Function......Page 203 Conclusion......Page 205 Chapter 11: HTML......Page 206 The Go HTML/Template Package......Page 207 Tokenizing HTML......Page 208 XHTML/HTML......Page 210 Conclusion......Page 211 Chapter 12: XML......Page 212 The Comment Type......Page 213 The Directive Type......Page 214 Unmarshalling XML......Page 216 Marshalling XML......Page 219 Conclusion......Page 220 Chapter 13: Remote Procedure Call......Page 221 Go’s RPC......Page 222 HTTP RPC Server......Page 224 HTTP RPC Client......Page 225 TCP RPC Server......Page 226 TCP RPC Client......Page 228 JSON......Page 229 JSON RPC Server......Page 230 JSON RPC Client......Page 231 Conclusion......Page 232 URIs and Resources......Page 233 Representations......Page 234 The PUT Verb......Page 235 HATEOAS......Page 236 Representing Links......Page 237 Transactions with REST......Page 238 The Richardson Maturity Model......Page 239 URLs......Page 240 The Demultiplexer (Demuxer)......Page 241 Content Negotiation......Page 242 GET /......Page 244 POST /......Page 245 The Complete Server......Page 246 Client......Page 252 Conclusion......Page 257 Chapter 15: WebSockets......Page 258 The Message Object......Page 259 The JSON Object......Page 262 The Codec Type......Page 265 WebSockets Over TLS......Page 268 WebSockets in an HTML Page......Page 270 The Gorilla Package......Page 274 Echo Server......Page 275 Echo Client......Page 276 Conclusion......Page 277 Afterword......Page 278 Index......Page 279 Dive Into Key Topics In Network Architecture And Go, Such As Data Serialization, Application Level Protocols, Character Sets And Encodings. This Book Covers Network Architecture And Gives An Overview Of The Go Language As A Primer, Covering The Latest Go Release. Beyond The Fundamentals, Network Programming With Go Covers Key Networking And Security Issues Such As Http And Https, Templates, Remote Procedure Call (rpc), Web Sockets Including Html5 Web Sockets, And More. Additionally, Author Jan Newmarch Guides You In Building And Connecting To A Complete Web Server Based On Go. This Book Can Serve As Both As An Essential Learning Guide And Reference On Go Networking. What You Will Learn Master Network Programming With Go Carry Out Data Serialization Use Application-level Protocols Manage Character Sets And Encodings Deal With Http(s) Build A Complete Go-based Web Server Work With Rpc, Web Sockets, And More Who This Book Is For Experienced Go Programmers And Other Programmers With Some Experience With The Go Language. 1. Architecture -- 2. Overview Of The Go Language -- 3. Socket-level Programming -- 4. Data Serialization -- 5. Application-level Protocols -- 6. Managing Character Sets And Encodings -- 7. Security -- 8. Http -- 9. Templates -- 10. A Complete Web Server -- 11. Html -- 12. Xml -- 13. Remote Procedure Call -- 14. Rest.-15. Web Sockets -- Afterword. By Jan Newmarch.