mirror of
https://github.com/Luzifer/cloudkeys-go.git
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492 lines
15 KiB
Go
492 lines
15 KiB
Go
// +build codegen
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package api
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import (
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"bytes"
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"fmt"
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"regexp"
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"sort"
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"strings"
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"text/template"
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)
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// An Operation defines a specific API Operation.
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type Operation struct {
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API *API `json:"-"`
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ExportedName string
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Name string
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Documentation string
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HTTP HTTPInfo
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InputRef ShapeRef `json:"input"`
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OutputRef ShapeRef `json:"output"`
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ErrorRefs []ShapeRef `json:"errors"`
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Paginator *Paginator
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Deprecated bool `json:"deprecated"`
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AuthType string `json:"authtype"`
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imports map[string]bool
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}
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// A HTTPInfo defines the method of HTTP request for the Operation.
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type HTTPInfo struct {
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Method string
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RequestURI string
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ResponseCode uint
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}
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// HasInput returns if the Operation accepts an input paramater
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func (o *Operation) HasInput() bool {
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return o.InputRef.ShapeName != ""
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}
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// HasOutput returns if the Operation accepts an output parameter
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func (o *Operation) HasOutput() bool {
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return o.OutputRef.ShapeName != ""
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}
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func (o *Operation) GetSigner() string {
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if o.AuthType == "v4-unsigned-body" {
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o.API.imports["github.com/aws/aws-sdk-go/aws/signer/v4"] = true
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}
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buf := bytes.NewBuffer(nil)
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switch o.AuthType {
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case "none":
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buf.WriteString("req.Config.Credentials = credentials.AnonymousCredentials")
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case "v4-unsigned-body":
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buf.WriteString("req.Handlers.Sign.Remove(v4.SignRequestHandler)\n")
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buf.WriteString("handler := v4.BuildNamedHandler(\"v4.CustomSignerHandler\", v4.WithUnsignedPayload)\n")
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buf.WriteString("req.Handlers.Sign.PushFrontNamed(handler)")
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}
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buf.WriteString("\n")
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return buf.String()
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}
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// tplOperation defines a template for rendering an API Operation
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var tplOperation = template.Must(template.New("operation").Funcs(template.FuncMap{
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"GetCrosslinkURL": GetCrosslinkURL,
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}).Parse(`
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const op{{ .ExportedName }} = "{{ .Name }}"
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// {{ .ExportedName }}Request generates a "aws/request.Request" representing the
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// client's request for the {{ .ExportedName }} operation. The "output" return
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// value will be populated with the request's response once the request complets
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// successfuly.
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//
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// Use "Send" method on the returned Request to send the API call to the service.
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// the "output" return value is not valid until after Send returns without error.
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//
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// See {{ .ExportedName }} for more information on using the {{ .ExportedName }}
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// API call, and error handling.
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//
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// This method is useful when you want to inject custom logic or configuration
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// into the SDK's request lifecycle. Such as custom headers, or retry logic.
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//
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//
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// // Example sending a request using the {{ .ExportedName }}Request method.
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// req, resp := client.{{ .ExportedName }}Request(params)
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//
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// err := req.Send()
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// if err == nil { // resp is now filled
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// fmt.Println(resp)
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// }
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{{ $crosslinkURL := GetCrosslinkURL $.API.BaseCrosslinkURL $.API.Metadata.UID $.ExportedName -}}
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{{ if ne $crosslinkURL "" -}}
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//
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// See also, {{ $crosslinkURL }}
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{{ end -}}
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func (c *{{ .API.StructName }}) {{ .ExportedName }}Request(` +
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`input {{ .InputRef.GoType }}) (req *request.Request, output {{ .OutputRef.GoType }}) {
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{{ if (or .Deprecated (or .InputRef.Deprecated .OutputRef.Deprecated)) }}if c.Client.Config.Logger != nil {
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c.Client.Config.Logger.Log("This operation, {{ .ExportedName }}, has been deprecated")
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}
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op := &request.Operation{ {{ else }} op := &request.Operation{ {{ end }}
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Name: op{{ .ExportedName }},
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{{ if ne .HTTP.Method "" }}HTTPMethod: "{{ .HTTP.Method }}",
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{{ end }}HTTPPath: {{ if ne .HTTP.RequestURI "" }}"{{ .HTTP.RequestURI }}"{{ else }}"/"{{ end }},
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{{ if .Paginator }}Paginator: &request.Paginator{
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InputTokens: {{ .Paginator.InputTokensString }},
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OutputTokens: {{ .Paginator.OutputTokensString }},
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LimitToken: "{{ .Paginator.LimitKey }}",
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TruncationToken: "{{ .Paginator.MoreResults }}",
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},
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{{ end }}
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}
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if input == nil {
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input = &{{ .InputRef.GoTypeElem }}{}
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}
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output = &{{ .OutputRef.GoTypeElem }}{}
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req = c.newRequest(op, input, output){{ if eq .OutputRef.Shape.Placeholder true }}
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req.Handlers.Unmarshal.Remove({{ .API.ProtocolPackage }}.UnmarshalHandler)
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req.Handlers.Unmarshal.PushBackNamed(protocol.UnmarshalDiscardBodyHandler){{ end }}
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{{ if ne .AuthType "" }}{{ .GetSigner }}{{ end -}}
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return
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}
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// {{ .ExportedName }} API operation for {{ .API.Metadata.ServiceFullName }}.
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{{ if .Documentation -}}
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//
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{{ .Documentation }}
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{{ end -}}
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//
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// Returns awserr.Error for service API and SDK errors. Use runtime type assertions
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// with awserr.Error's Code and Message methods to get detailed information about
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// the error.
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//
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// See the AWS API reference guide for {{ .API.Metadata.ServiceFullName }}'s
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// API operation {{ .ExportedName }} for usage and error information.
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{{ if .ErrorRefs -}}
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//
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// Returned Error Codes:
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{{ range $_, $err := .ErrorRefs -}}
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// * {{ $err.Shape.ErrorCodeName }} "{{ $err.Shape.ErrorName}}"
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{{ if $err.Docstring -}}
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{{ $err.IndentedDocstring }}
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{{ end -}}
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//
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{{ end -}}
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{{ end -}}
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{{ $crosslinkURL := GetCrosslinkURL $.API.BaseCrosslinkURL $.API.Metadata.UID $.ExportedName -}}
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{{ if ne $crosslinkURL "" -}}
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// See also, {{ $crosslinkURL }}
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{{ end -}}
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func (c *{{ .API.StructName }}) {{ .ExportedName }}(` +
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`input {{ .InputRef.GoType }}) ({{ .OutputRef.GoType }}, error) {
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req, out := c.{{ .ExportedName }}Request(input)
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return out, req.Send()
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}
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// {{ .ExportedName }}WithContext is the same as {{ .ExportedName }} with the addition of
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// the ability to pass a context and additional request options.
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//
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// See {{ .ExportedName }} for details on how to use this API operation.
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//
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// The context must be non-nil and will be used for request cancellation. If
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// the context is nil a panic will occur. In the future the SDK may create
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// sub-contexts for http.Requests. See https://golang.org/pkg/context/
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// for more information on using Contexts.
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func (c *{{ .API.StructName }}) {{ .ExportedName }}WithContext(` +
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`ctx aws.Context, input {{ .InputRef.GoType }}, opts ...request.Option) ` +
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`({{ .OutputRef.GoType }}, error) {
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req, out := c.{{ .ExportedName }}Request(input)
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req.SetContext(ctx)
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req.ApplyOptions(opts...)
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return out, req.Send()
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}
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{{ if .Paginator }}
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// {{ .ExportedName }}Pages iterates over the pages of a {{ .ExportedName }} operation,
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// calling the "fn" function with the response data for each page. To stop
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// iterating, return false from the fn function.
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//
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// See {{ .ExportedName }} method for more information on how to use this operation.
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//
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// Note: This operation can generate multiple requests to a service.
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//
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// // Example iterating over at most 3 pages of a {{ .ExportedName }} operation.
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// pageNum := 0
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// err := client.{{ .ExportedName }}Pages(params,
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// func(page {{ .OutputRef.GoType }}, lastPage bool) bool {
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// pageNum++
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// fmt.Println(page)
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// return pageNum <= 3
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// })
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//
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func (c *{{ .API.StructName }}) {{ .ExportedName }}Pages(` +
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`input {{ .InputRef.GoType }}, fn func({{ .OutputRef.GoType }}, bool) bool) error {
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return c.{{ .ExportedName }}PagesWithContext(aws.BackgroundContext(), input, fn)
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}
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// {{ .ExportedName }}PagesWithContext same as {{ .ExportedName }}Pages except
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// it takes a Context and allows setting request options on the pages.
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//
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// The context must be non-nil and will be used for request cancellation. If
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// the context is nil a panic will occur. In the future the SDK may create
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// sub-contexts for http.Requests. See https://golang.org/pkg/context/
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// for more information on using Contexts.
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func (c *{{ .API.StructName }}) {{ .ExportedName }}PagesWithContext(` +
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`ctx aws.Context, ` +
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`input {{ .InputRef.GoType }}, ` +
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`fn func({{ .OutputRef.GoType }}, bool) bool, ` +
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`opts ...request.Option) error {
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p := request.Pagination {
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NewRequest: func() (*request.Request, error) {
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var inCpy {{ .InputRef.GoType }}
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if input != nil {
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tmp := *input
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inCpy = &tmp
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}
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req, _ := c.{{ .ExportedName }}Request(inCpy)
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req.SetContext(ctx)
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req.ApplyOptions(opts...)
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return req, nil
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},
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}
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cont := true
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for p.Next() && cont {
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cont = fn(p.Page().({{ .OutputRef.GoType }}), !p.HasNextPage())
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}
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return p.Err()
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}
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{{ end }}
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`))
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// GoCode returns a string of rendered GoCode for this Operation
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func (o *Operation) GoCode() string {
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var buf bytes.Buffer
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err := tplOperation.Execute(&buf, o)
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if err != nil {
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panic(err)
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}
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return strings.TrimSpace(buf.String())
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}
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// tplInfSig defines the template for rendering an Operation's signature within an Interface definition.
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var tplInfSig = template.Must(template.New("opsig").Parse(`
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{{ .ExportedName }}({{ .InputRef.GoTypeWithPkgName }}) ({{ .OutputRef.GoTypeWithPkgName }}, error)
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{{ .ExportedName }}WithContext(aws.Context, {{ .InputRef.GoTypeWithPkgName }}, ...request.Option) ({{ .OutputRef.GoTypeWithPkgName }}, error)
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{{ .ExportedName }}Request({{ .InputRef.GoTypeWithPkgName }}) (*request.Request, {{ .OutputRef.GoTypeWithPkgName }})
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{{ if .Paginator -}}
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{{ .ExportedName }}Pages({{ .InputRef.GoTypeWithPkgName }}, func({{ .OutputRef.GoTypeWithPkgName }}, bool) bool) error
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{{ .ExportedName }}PagesWithContext(aws.Context, {{ .InputRef.GoTypeWithPkgName }}, func({{ .OutputRef.GoTypeWithPkgName }}, bool) bool, ...request.Option) error
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{{- end }}
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`))
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// InterfaceSignature returns a string representing the Operation's interface{}
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// functional signature.
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func (o *Operation) InterfaceSignature() string {
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var buf bytes.Buffer
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err := tplInfSig.Execute(&buf, o)
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if err != nil {
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panic(err)
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}
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return strings.TrimSpace(buf.String())
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}
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// tplExample defines the template for rendering an Operation example
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var tplExample = template.Must(template.New("operationExample").Parse(`
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func Example{{ .API.StructName }}_{{ .ExportedName }}() {
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sess := session.Must(session.NewSession())
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svc := {{ .API.PackageName }}.New(sess)
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{{ .ExampleInput }}
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resp, err := svc.{{ .ExportedName }}(params)
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if err != nil {
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// Print the error, cast err to awserr.Error to get the Code and
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// Message from an error.
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fmt.Println(err.Error())
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return
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}
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// Pretty-print the response data.
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fmt.Println(resp)
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}
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`))
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// Example returns a string of the rendered Go code for the Operation
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func (o *Operation) Example() string {
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var buf bytes.Buffer
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err := tplExample.Execute(&buf, o)
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if err != nil {
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panic(err)
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}
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return strings.TrimSpace(buf.String())
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}
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// ExampleInput return a string of the rendered Go code for an example's input parameters
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func (o *Operation) ExampleInput() string {
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if len(o.InputRef.Shape.MemberRefs) == 0 {
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if strings.Contains(o.InputRef.GoTypeElem(), ".") {
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o.imports["github.com/aws/aws-sdk-go/service/"+strings.Split(o.InputRef.GoTypeElem(), ".")[0]] = true
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return fmt.Sprintf("var params *%s", o.InputRef.GoTypeElem())
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}
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return fmt.Sprintf("var params *%s.%s",
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o.API.PackageName(), o.InputRef.GoTypeElem())
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}
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e := example{o, map[string]int{}}
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return "params := " + e.traverseAny(o.InputRef.Shape, false, false)
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}
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// A example provides
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type example struct {
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*Operation
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visited map[string]int
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}
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// traverseAny returns rendered Go code for the shape.
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func (e *example) traverseAny(s *Shape, required, payload bool) string {
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str := ""
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e.visited[s.ShapeName]++
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switch s.Type {
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case "structure":
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str = e.traverseStruct(s, required, payload)
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case "list":
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str = e.traverseList(s, required, payload)
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case "map":
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str = e.traverseMap(s, required, payload)
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case "jsonvalue":
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str = "aws.JSONValue{\"key\": \"value\"}"
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if required {
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str += " // Required"
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}
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default:
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str = e.traverseScalar(s, required, payload)
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}
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e.visited[s.ShapeName]--
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return str
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}
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var reType = regexp.MustCompile(`\b([A-Z])`)
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// traverseStruct returns rendered Go code for a structure type shape.
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func (e *example) traverseStruct(s *Shape, required, payload bool) string {
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var buf bytes.Buffer
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if s.resolvePkg != "" {
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e.imports[s.resolvePkg] = true
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buf.WriteString("&" + s.GoTypeElem() + "{")
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} else {
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buf.WriteString("&" + s.API.PackageName() + "." + s.GoTypeElem() + "{")
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}
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if required {
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buf.WriteString(" // Required")
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}
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buf.WriteString("\n")
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req := make([]string, len(s.Required))
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copy(req, s.Required)
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sort.Strings(req)
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if e.visited[s.ShapeName] < 2 {
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for _, n := range req {
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m := s.MemberRefs[n].Shape
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p := n == s.Payload && (s.MemberRefs[n].Streaming || m.Streaming)
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buf.WriteString(n + ": " + e.traverseAny(m, true, p) + ",")
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if m.Type != "list" && m.Type != "structure" && m.Type != "map" {
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buf.WriteString(" // Required")
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}
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buf.WriteString("\n")
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}
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for _, n := range s.MemberNames() {
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if s.IsRequired(n) {
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continue
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}
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m := s.MemberRefs[n].Shape
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p := n == s.Payload && (s.MemberRefs[n].Streaming || m.Streaming)
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buf.WriteString(n + ": " + e.traverseAny(m, false, p) + ",\n")
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}
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} else {
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buf.WriteString("// Recursive values...\n")
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}
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buf.WriteString("}")
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return buf.String()
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}
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// traverseMap returns rendered Go code for a map type shape.
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func (e *example) traverseMap(s *Shape, required, payload bool) string {
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var buf bytes.Buffer
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t := ""
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if s.resolvePkg != "" {
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e.imports[s.resolvePkg] = true
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t = s.GoTypeElem()
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} else {
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t = reType.ReplaceAllString(s.GoTypeElem(), s.API.PackageName()+".$1")
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}
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buf.WriteString(t + "{")
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if required {
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buf.WriteString(" // Required")
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}
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buf.WriteString("\n")
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if e.visited[s.ShapeName] < 2 {
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m := s.ValueRef.Shape
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buf.WriteString("\"Key\": " + e.traverseAny(m, true, false) + ",")
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if m.Type != "list" && m.Type != "structure" && m.Type != "map" {
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buf.WriteString(" // Required")
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}
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buf.WriteString("\n// More values...\n")
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} else {
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buf.WriteString("// Recursive values...\n")
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}
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buf.WriteString("}")
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return buf.String()
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}
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// traverseList returns rendered Go code for a list type shape.
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func (e *example) traverseList(s *Shape, required, payload bool) string {
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var buf bytes.Buffer
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t := ""
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if s.resolvePkg != "" {
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e.imports[s.resolvePkg] = true
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t = s.GoTypeElem()
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} else {
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t = reType.ReplaceAllString(s.GoTypeElem(), s.API.PackageName()+".$1")
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}
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buf.WriteString(t + "{")
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if required {
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buf.WriteString(" // Required")
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}
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buf.WriteString("\n")
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if e.visited[s.ShapeName] < 2 {
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m := s.MemberRef.Shape
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buf.WriteString(e.traverseAny(m, true, false) + ",")
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if m.Type != "list" && m.Type != "structure" && m.Type != "map" {
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buf.WriteString(" // Required")
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}
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buf.WriteString("\n// More values...\n")
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} else {
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buf.WriteString("// Recursive values...\n")
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}
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buf.WriteString("}")
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return buf.String()
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}
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// traverseScalar returns an AWS Type string representation initialized to a value.
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// Will panic if s is an unsupported shape type.
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func (e *example) traverseScalar(s *Shape, required, payload bool) string {
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str := ""
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switch s.Type {
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case "integer", "long":
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str = `aws.Int64(1)`
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case "float", "double":
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str = `aws.Float64(1.0)`
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case "string", "character":
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str = `aws.String("` + s.ShapeName + `")`
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case "blob":
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if payload {
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str = `bytes.NewReader([]byte("PAYLOAD"))`
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} else {
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str = `[]byte("PAYLOAD")`
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}
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case "boolean":
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str = `aws.Bool(true)`
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case "timestamp":
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str = `aws.Time(time.Now())`
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default:
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panic("unsupported shape " + s.Type)
|
|
}
|
|
|
|
return str
|
|
}
|