146 lines
4.4 KiB
Go
146 lines
4.4 KiB
Go
//go:build go1.18
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// +build go1.18
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// Copyright (c) Microsoft Corporation. All rights reserved.
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// Licensed under the MIT License.
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package op
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"github.com/Azure/azure-sdk-for-go/sdk/azcore/internal/exported"
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"github.com/Azure/azure-sdk-for-go/sdk/azcore/internal/log"
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"github.com/Azure/azure-sdk-for-go/sdk/azcore/internal/pollers"
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"github.com/Azure/azure-sdk-for-go/sdk/azcore/internal/shared"
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"github.com/Azure/azure-sdk-for-go/sdk/internal/poller"
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)
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// Applicable returns true if the LRO is using Operation-Location.
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func Applicable(resp *http.Response) bool {
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return resp.Header.Get(shared.HeaderOperationLocation) != ""
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}
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// CanResume returns true if the token can rehydrate this poller type.
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func CanResume(token map[string]interface{}) bool {
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_, ok := token["oplocURL"]
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return ok
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}
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// Poller is an LRO poller that uses the Operation-Location pattern.
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type Poller[T any] struct {
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pl exported.Pipeline
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resp *http.Response
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OpLocURL string `json:"oplocURL"`
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LocURL string `json:"locURL"`
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OrigURL string `json:"origURL"`
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Method string `json:"method"`
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FinalState pollers.FinalStateVia `json:"finalState"`
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CurState string `json:"state"`
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}
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// New creates a new Poller from the provided initial response.
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// Pass nil for response to create an empty Poller for rehydration.
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func New[T any](pl exported.Pipeline, resp *http.Response, finalState pollers.FinalStateVia) (*Poller[T], error) {
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if resp == nil {
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log.Write(log.EventLRO, "Resuming Operation-Location poller.")
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return &Poller[T]{pl: pl}, nil
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}
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log.Write(log.EventLRO, "Using Operation-Location poller.")
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opURL := resp.Header.Get(shared.HeaderOperationLocation)
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if opURL == "" {
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return nil, errors.New("response is missing Operation-Location header")
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}
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if !poller.IsValidURL(opURL) {
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return nil, fmt.Errorf("invalid Operation-Location URL %s", opURL)
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}
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locURL := resp.Header.Get(shared.HeaderLocation)
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// Location header is optional
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if locURL != "" && !poller.IsValidURL(locURL) {
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return nil, fmt.Errorf("invalid Location URL %s", locURL)
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}
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// default initial state to InProgress. if the
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// service sent us a status then use that instead.
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curState := poller.StatusInProgress
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status, err := poller.GetStatus(resp)
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if err != nil && !errors.Is(err, poller.ErrNoBody) {
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return nil, err
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}
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if status != "" {
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curState = status
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}
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return &Poller[T]{
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pl: pl,
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resp: resp,
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OpLocURL: opURL,
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LocURL: locURL,
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OrigURL: resp.Request.URL.String(),
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Method: resp.Request.Method,
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FinalState: finalState,
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CurState: curState,
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}, nil
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}
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func (p *Poller[T]) Done() bool {
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return poller.IsTerminalState(p.CurState)
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}
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func (p *Poller[T]) Poll(ctx context.Context) (*http.Response, error) {
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err := pollers.PollHelper(ctx, p.OpLocURL, p.pl, func(resp *http.Response) (string, error) {
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if !poller.StatusCodeValid(resp) {
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p.resp = resp
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return "", exported.NewResponseError(resp)
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}
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state, err := poller.GetStatus(resp)
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if err != nil {
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return "", err
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} else if state == "" {
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return "", errors.New("the response did not contain a status")
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}
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p.resp = resp
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p.CurState = state
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return p.CurState, nil
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})
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if err != nil {
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return nil, err
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}
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return p.resp, nil
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}
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func (p *Poller[T]) Result(ctx context.Context, out *T) error {
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var req *exported.Request
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var err error
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if p.FinalState == pollers.FinalStateViaLocation && p.LocURL != "" {
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req, err = exported.NewRequest(ctx, http.MethodGet, p.LocURL)
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} else if p.FinalState == pollers.FinalStateViaOpLocation && p.Method == http.MethodPost {
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// no final GET required, terminal response should have it
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} else if rl, rlErr := poller.GetResourceLocation(p.resp); rlErr != nil && !errors.Is(rlErr, poller.ErrNoBody) {
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return rlErr
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} else if rl != "" {
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req, err = exported.NewRequest(ctx, http.MethodGet, rl)
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} else if p.Method == http.MethodPatch || p.Method == http.MethodPut {
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req, err = exported.NewRequest(ctx, http.MethodGet, p.OrigURL)
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} else if p.Method == http.MethodPost && p.LocURL != "" {
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req, err = exported.NewRequest(ctx, http.MethodGet, p.LocURL)
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}
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if err != nil {
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return err
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}
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// if a final GET request has been created, execute it
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if req != nil {
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resp, err := p.pl.Do(req)
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if err != nil {
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return err
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}
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p.resp = resp
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}
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return pollers.ResultHelper(p.resp, poller.Failed(p.CurState), out)
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}
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