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Previous Chapter

Chapter 11. Reflection and code generation

List of Figures

Index

[SYMBOL][A][B][C][D][E][F][G][H][I][J][K][L][M][N][O][P][Q][R][S][T][U][V][W][X][Y]

SYMBOL

- character ?: operator . character * character , 2^nd <- operator 304 Not Modified response 404 Not Found error , 2^nd, 3^rd, 4^th 409 Conflict message

A

Abstract Syntax Tree . See AST. accept property ACK messages Action function actions AES (Advanced Encryption Standard) Alert log level An Error Occurred message annotations structs tags validating anonymous goroutine Ansible ops platform API version in content type in URL apt-get package manager arrow operator AST (Abstract Syntax Tree) asterisk character , 2^nd asynchronous I/O autonomous applications

B

back pressure bar function BenchmarkCompiled-Templates benchmarking BenchmarkParallelTemplates block directive bool channel bots brew install go command BSD (Berkeley Software Distribution) building for cloud bytes.Buffer

C

C language c.Args() method Caller function Callers function cancel() function Cascading Style Sheets . See CSS. CBOR (Concise Binary Object Representation) CDN (content delivery network) CGI (Common Gateway Interface) cgo channels , 2^nd, 3^rd Char property Check() function Chef ops platform CLI applications, working with command-line flags gnuflag go-flags command-line frameworks commands and subcommands simple console application cli.go framework cli.NewApp cli.NewExitError function close function cloud computing building for cloud containers and cloud-native applications infrastructure as service managing services avoiding cloud provider lock-in handling errors overview performing runtime detection performing runtime monitoring platform as service software as service cloud file storage cloud provider errors cloud provider interface cloud provider lock-in, avoiding cloud services microservices REST alternatives to making faster cloud-native applications, containers and code coverage code generation codec package CodecDecodeSelf CodecEncodeSelf codecgen command command-line flags gnuflag package go-flags overview command-line frameworks commands and subcommands overview simple console application command-line interface . See CLI. Commands property Common Gateway Interface . See CGI. Communicating Sequential Processes . See CSP. communication between cloud services with protocol buffers compressing files Concat function ConcatError type Concise Binary Object Representation . See CBOR. concurrency channels goroutines overview conf variable configuration configuration struct connection timeouts containers cloud-native applications and overview content delivery network . See CDN. Content property content types , 2^nd Content-Type field context package count function -cover flag Critical log level cross-compiling cross-site scripting . See XSS. cryptography CSP (Communicating Sequential Processes) CSRF (cross-site request forgery) token CSS (Cascading Style Sheets) ctx.Err() function custom errors generating passing reading and using

D

dash character data encoding Data Encryption Standard . See DES. dateFormat function Debug log level debugging information locating bugs logging log package system loggers with stack traces deep info . See stack dumps. default flag behavior default statement , 2^nd defer block deferred functions , 2^nd define directive DELETE request , 2^nd dequeue method DES (Data Encryption Standard) DetectContentType function detecting dependencies Dial function directives DisableKeepAlives property divide function done channel Done() function dot character double curly brackets , 2^nd download function

E

Elem() function Email key email, using templates for Emergency log level encoding/json package , 2^nd, 3^rd encoding/xml package end directive enqueue method environment variables EOF (end of the file) err value err variable Error function , 2^nd, 3^rd, 4^th error handling error interface Error log level error messages error passing Error struct , 2^nd error type Error() method errors cloud services differentiating from panics passing and handling over HTTP generating custom errors reading and using custom errors errors.New function , 2^nd ErrRejected error ErrTimeout error etcd exampledata directory ExecuteTemplate , 2^nd Extensible Markup Language . See XML. external packages

F

FastCGI server faults, REST APIs fieldName() function fields, ignoring file handling, multipart submissions and File interface file storage file string File struct file variable FileName method filepath.Join filepath.ListSeparator filepath.Separator filepath.Split filepath.SplitList filepath.ToSlash FileServer handler fileStore function flag package flag.Parse() method Flags property float64 function fmt command fmt package , 2^nd fmt.Errorf function fmt.Fprintf() function fmt.Sprintf function for loop , 2^nd for/select loop form handling files and multipart submissions form requests raw multipart data Form property format package formatting FormFile method FormName method FormValue function fs.FileServer function functionality, adding to HTML templates

G

GDB (GNU Debugger) plugin generating code generative testing GET HTTP request GET request , 2^nd, 3^rd, 4^th, 5^th, 6^th GetBool method getName git add command git commit command git push command Git version-control system github.com/Masterminds/ go-fileserver package glide executable global flags GNU Debugger plugin gnuflag package go build command Go flag system go fmt command go generate command , 2^nd go get command go install command go keyword Go programming language compared with other languages C language JavaScript Node.js PHP language Python language concurrency with goroutines and channels environment variables go executable as toolchain code coverage formatting package management testing Hello application installing multiple return values overview standard library of cryptography data encoding HTML networking and HTTP version control workspace go test command , 2^nd go tool go toolchain , 2^nd go-flags go.rice package go/ast package GOARCH variable godeb tool GoDoer type golang . See Go programming language. goodbye function GOOS variable $GOPACKAGE variable $GOPATH variable Gorilla web toolkit goroutines overview panics and gox groupcache gRPC plugin

H

handle function , 2^nd handler function HandlerFunc interface <head> section head.html Hello application hello function hello_test.go file HMAC (Keyed-Hash Message Authentication Code) homePage function host information host IP addresses html package HTML templates mixing templates parsing templates standard library template execution failure HTML type html/template packages , 2^nd, 3^rd, 4^th, 5^th HTTP client overview passing and handling errors over generating custom errors reading and using custom errors REST APIs http function , 2^nd HTTP methods http package , 2^nd, 3^rd, 4^th, 5^th, 6^th, 7^th, 8^th, 9^th, 10^th http.DefaultClient http.DefaultTransport http.Dir object , 2^nd http.FileServer function http.Get() function , 2^nd, 3^rd http.HandleFunc function http.Head function http.Post() function , 2^nd http.PostForm function http.Request.Method http.Request.Path http.ResponseWriter http.Transport hypervisors

I

IaaS (infrastructure as service) if statement if/else statement If-Modified-Since header , 2^nd ignoring fields implements() function import statement index.html file , 2^nd Info log level informational messages insert method installing Go interface{} io.EOF error , 2^nd io.ErrNoProgress error io.Reader interface , 2^nd io.Seeker interface io.Writer interface , 2^nd, 3^rd

J

JavaScript, Node.js JIT (just-in-time) compiler JSON (JavaScript Object Notation) marshaling overview , 2^nd parsing and mapping unmarshaling json package JSON schemas

K

Keyed-Hash Message Authentication Code . See HMAC. Kind switch kinds (reflection) Kubernetes

L

launchpad.net/gnuflag package Ldate libmagic libraries lightweight threads , 2^nd Line property listen function , 2^nd, 3^rd ListenAndServe listener function listenForShutdown function Llongfile Lmicrosends Load method locating bugs locking with channels locks log levels log package , 2^nd log.Fatal function log.Fatalln function log.Logger function log.Lshortfile log.LstdFlags log.Panic function log.Printf method Logf() function logging log package overview system loggers LOG_NOTICE setting long flags ls -la command Lshortifle LstdFlags Ltime

M

main function , 2^nd, 3^rd, 4^th, 5^th, 6^th, 7^th, 8^th, 9^th, 10^th, 11^th, 12^th manners package mapping JSON marshal() method , 2^nd marshaling memory-caching service Mercurial version-control system message function Message property , 2^nd metaprogramming microservices , 2^nd mime package mixing templates MockMessage type multipart submissions, file handling and multipart.File object multipart.FileHeader object , 2^nd MultipartForm property , 2^nd MultipartReader method , 2^nd multiple attribute multiple cloud providers multiple return values multiple-letter flags mutex.RLock mutex.RUnlock MyInt value

N

name key Name property , 2^nd named return variables Names function net package , 2^nd net.Conn type net.Dial , 2^nd net.DialTimeout net/http package , 2^nd net/http/cgi package net/http/fastcgi package net/smtp package net/url package Netcat networking New Relic nil value , 2^nd Node.js NotFound function , 2^nd Notice log level npm package manager

O

OpenCSV function ops platforms os.File type os.Getpid() method os.Getwd() method os.Hostname() method os.PathListSeparator os.PathSeparator os/exec package Other field

P

PaaS (platform-as-a-service) , 2^nd package handling package management Page type page.html template panic(nil) function panics differentiating from errors goroutines and overview recovering from working with panics Parse function , 2^nd ParseError function ParseFiles function , 2^nd ParseForm method ParseInt function ParseMultipartForm , 2^nd, 3^rd, 4^th parsing JSON parsing templates path package , 2^nd pathResolver , 2^nd PATTERN expression pb.Next() function performance tests . See benchmarking. PHP language PID (process ID) piped variables pipelining platform-as-a-service . See PaaS. PORT variable POST requests PostForm property PostFormValue method precheckDivide function printCount PrintDefaults function printf function PrintStack function process ID . See PID. Processes struct processing tags ProcessMultipartForm protocol buffers clients communicating with defining messages and RPC calls with file overview plugin request gRPC server with server handler server setup Puppet ops platform Python language

Q

queue templates Quote object , 2^nd

R

race condition , 2^nd race detection --race flag race flag randomly generated values Range HTTP header raw multipart data ReadFile function ReadFileInto function reading custom errors readme handler readStdin function recover function reflect package , 2^nd, 3^rd, 4^th, 5^th, 6^th reflect.Indirect() method reflect.Interface type reflect.Kind reflect.Type , 2^nd reflect.TypeOf() function reflect.Value type reflect.ValueOf() function reflection features of kinds structs, annotating tags, annotating types values regexp package reimplementing locks remote procedure call . See RPC. remove method RemoveEmptyLines function Request object , 2^nd, 3^rd, 4^th res.Status res.StatusCode response function , 2^nd REST (Representational State Transfer) alternatives to making faster overview REST APIs faults using HTTP client versioning result value return values reusing connections rice embed-go command rice.MustFindBox Rijndael . See AES (Advanced Encryption Standard). RLock routing web requests RPC (remote procedure call) run function RUnlock RunParallel method runtime detection, cloud computing and runtime monitoring, cloud computing and runtime package , 2^nd runtime.Gosched() function runtime.ReadMemStats function RWMutex object

S

SaaS (software as service) Save method SCM (software configuration management) SDKs (software development kits) Secure Hash Algorithm . See SHA. select statement , 2^nd SendRequest function ServeContent function , 2^nd ServeFile function ServeHTTP method , 2^nd serveTemplate function serving static content setField() function SHA (Secure Hash Algorithm) short flags short variable declarations signal package simple_gz.go program Sinatra slow-start smtp package software as service . See SaaS. software configuration management . See SCM. software development kits . See SDKs. source code stack dumps , 2^nd Stack function stack traces, debugging with Standard Error standard library (HTML templates) Standard Output start function static content . See serving static content. strconv package streaming responses String() method strings package StripPrefix struct fields StructField.Tag.Get() function StructField.Tag() function structs accessing accessing fields on annotating generating marshaling processing tags on unmarshaling styles template sum() function switching values sync package , 2^nd, 3^rd, 4^th, 5^th sync.Locker interface sync.Mutex , 2^nd sync.RWLock sync.WaitGroup syslog package , 2^nd syslog.Debug function syslog.Dial function system loggers

T

T.Error function t.Execute() function T.Fatal function tags, annotating target interface TCP (Transmission Control Protocol) TDEA (Triple Data Encryption Algorithm) template execution failure template.HTML template.Template instance templates HTML templates mixing templates parsing templates standard library template execution failure overview using for email ternary operator _test.go files testing benchmarking generative testing overview unit testing testing code testing package , 2^nd testing/quick package TestName text/template package , 2^nd text/template/parser package time.After function time.Sleep , 2^nd time.Time function Timeout() method timeouts TLS (Transport Layer Security) toolchain, go executable as code coverage formatting package management testing Trace log level transcoding application Transmission Control Protocol . See TCP. Triple Data Encryption Algorithm . See TDEA. try/catch blocks , 2^nd Twelve-Factor App paradigm twelve-factor apps type switch sum with with extra type Type.Elem() function Type.Interface() method Type.NumField() function TypeByExtension function types checking and converting discussion examining

U

UDP (User Datagram Protocol) unbuffered channel unit testing UNIX variant unmarshal() method , 2^nd unmarshaling User type user.html template user.proto file user_generated.go file

V

vals map Value property values discussion examining implementing interfaces return of multiple switching values map varargs variable variable syntax variable-length argument lists verbs version control versioning REST APIs VisitAll function VMs (virtual machines) , 2^nd

W

WaitGroup walk() function Warn log level web servers, working with overview routing web requests starting up and shutting down server web services parsing and mapping JSON passing and handling errors over HTTP generating custom errors reading and using custom errors REST APIs faults using HTTP client versioning wg.Done function wg.Wait function words struct words.add words.found map words.Lock method words.Unlock method workspace

X

X-Content-Type-Options header XML (Extensible Markup Language) xml tag XSS (cross-site scripting)

Y

YAML (YAML Ain’t Markup Language) yaml package yikes function yum package manager

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