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vendor/github.com/aws/aws-sdk-go/private/model/api/waiters.go

@@ -0,0 +1,189 @@
+// +build codegen
+
+package api
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+	"os"
+	"sort"
+	"strings"
+	"text/template"
+)
+
+// WaiterAcceptor is the acceptors defined in the model the SDK will use
+// to wait on resource states with.
+type WaiterAcceptor struct {
+	State    string
+	Matcher  string
+	Argument string
+	Expected interface{}
+}
+
+// ExpectedString returns the string that was expected by the WaiterAcceptor
+func (a *WaiterAcceptor) ExpectedString() string {
+	switch a.Expected.(type) {
+	case string:
+		return fmt.Sprintf("%q", a.Expected)
+	default:
+		return fmt.Sprintf("%v", a.Expected)
+	}
+}
+
+// A Waiter is an individual waiter definition.
+type Waiter struct {
+	Name          string
+	Delay         int
+	MaxAttempts   int
+	OperationName string `json:"operation"`
+	Operation     *Operation
+	Acceptors     []WaiterAcceptor
+}
+
+// WaitersGoCode generates and returns Go code for each of the waiters of
+// this API.
+func (a *API) WaitersGoCode() string {
+	var buf bytes.Buffer
+	fmt.Fprintf(&buf, "import (\n%q\n\n%q\n%q\n)",
+		"time",
+		"github.com/aws/aws-sdk-go/aws",
+		"github.com/aws/aws-sdk-go/aws/request",
+	)
+
+	for _, w := range a.Waiters {
+		buf.WriteString(w.GoCode())
+	}
+	return buf.String()
+}
+
+// used for unmarshaling from the waiter JSON file
+type waiterDefinitions struct {
+	*API
+	Waiters map[string]Waiter
+}
+
+// AttachWaiters reads a file of waiter definitions, and adds those to the API.
+// Will panic if an error occurs.
+func (a *API) AttachWaiters(filename string) {
+	p := waiterDefinitions{API: a}
+
+	f, err := os.Open(filename)
+	defer f.Close()
+	if err != nil {
+		panic(err)
+	}
+	err = json.NewDecoder(f).Decode(&p)
+	if err != nil {
+		panic(err)
+	}
+
+	p.setup()
+}
+
+func (p *waiterDefinitions) setup() {
+	p.API.Waiters = []Waiter{}
+	i, keys := 0, make([]string, len(p.Waiters))
+	for k := range p.Waiters {
+		keys[i] = k
+		i++
+	}
+	sort.Strings(keys)
+
+	for _, n := range keys {
+		e := p.Waiters[n]
+		n = p.ExportableName(n)
+		e.Name = n
+		e.OperationName = p.ExportableName(e.OperationName)
+		e.Operation = p.API.Operations[e.OperationName]
+		if e.Operation == nil {
+			panic("unknown operation " + e.OperationName + " for waiter " + n)
+		}
+		p.API.Waiters = append(p.API.Waiters, e)
+	}
+}
+
+var waiterTmpls = template.Must(template.New("waiterTmpls").Funcs(
+	template.FuncMap{
+		"titleCase": func(v string) string {
+			return strings.Title(v)
+		},
+	},
+).Parse(`
+{{ define "waiter"}}
+// WaitUntil{{ .Name }} uses the {{ .Operation.API.NiceName }} API operation
+// {{ .OperationName }} to wait for a condition to be met before returning.
+// If the condition is not meet within the max attempt window an error will
+// be returned.
+func (c *{{ .Operation.API.StructName }}) WaitUntil{{ .Name }}(input {{ .Operation.InputRef.GoType }}) error {
+	return c.WaitUntil{{ .Name }}WithContext(aws.BackgroundContext(), input)
+}
+
+// WaitUntil{{ .Name }}WithContext is an extended version of WaitUntil{{ .Name }}.
+// With the support for passing in a context and options to configure the
+// Waiter and the underlying request options.
+//
+// The context must be non-nil and will be used for request cancellation. If
+// the context is nil a panic will occur. In the future the SDK may create
+// sub-contexts for http.Requests. See https://golang.org/pkg/context/
+// for more information on using Contexts.
+func (c *{{ .Operation.API.StructName }}) WaitUntil{{ .Name }}WithContext(` +
+	`ctx aws.Context, input {{ .Operation.InputRef.GoType }}, opts ...request.WaiterOption) error {
+	w := request.Waiter{
+		Name:    "WaitUntil{{ .Name }}",
+		MaxAttempts: {{ .MaxAttempts }},
+		Delay: request.ConstantWaiterDelay({{ .Delay }} * time.Second),
+		Acceptors: []request.WaiterAcceptor{
+			{{ range $_, $a := .Acceptors }}{
+				State:    request.{{ titleCase .State }}WaiterState,
+				Matcher:  request.{{ titleCase .Matcher }}WaiterMatch,
+				{{- if .Argument }}Argument: "{{ .Argument }}",{{ end }}
+				Expected: {{ .ExpectedString }},
+			},
+			{{ end }}
+		},
+		Logger: c.Config.Logger,
+		NewRequest: func(opts []request.Option) (*request.Request, error) {
+			var inCpy {{ .Operation.InputRef.GoType }}
+			if input != nil  {
+				tmp := *input
+				inCpy = &tmp
+			}
+			req, _ := c.{{ .OperationName }}Request(inCpy)
+			req.SetContext(ctx)
+			req.ApplyOptions(opts...)
+			return req, nil
+		},
+	}
+	w.ApplyOptions(opts...)
+
+	return w.WaitWithContext(ctx)
+}
+{{- end }}
+
+{{ define "waiter interface" }}
+WaitUntil{{ .Name }}({{ .Operation.InputRef.GoTypeWithPkgName }}) error
+WaitUntil{{ .Name }}WithContext(aws.Context, {{ .Operation.InputRef.GoTypeWithPkgName }}, ...request.WaiterOption) error
+{{- end }}
+`))
+
+// InterfaceSignature returns a string representing the Waiter's interface
+// function signature.
+func (w *Waiter) InterfaceSignature() string {
+	var buf bytes.Buffer
+	if err := waiterTmpls.ExecuteTemplate(&buf, "waiter interface", w); err != nil {
+		panic(err)
+	}
+
+	return strings.TrimSpace(buf.String())
+}
+
+// GoCode returns the generated Go code for an individual waiter.
+func (w *Waiter) GoCode() string {
+	var buf bytes.Buffer
+	if err := waiterTmpls.ExecuteTemplate(&buf, "waiter", w); err != nil {
+		panic(err)
+	}
+
+	return buf.String()
+}