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package azblob
import (
"context"
"errors"
"github.com/Azure/azure-pipeline-go/pipeline"
)
// NewUniqueRequestIDPolicyFactory creates a UniqueRequestIDPolicyFactory object
// that sets the request's x-ms-client-request-id header if it doesn't already exist.
func NewUniqueRequestIDPolicyFactory() pipeline.Factory {
return pipeline.FactoryFunc(func(next pipeline.Policy, po *pipeline.PolicyOptions) pipeline.PolicyFunc {
// This is Policy's Do method:
return func(ctx context.Context, request pipeline.Request) (pipeline.Response, error) {
id := request.Header.Get(xMsClientRequestID)
if id == "" { // Add a unique request ID if the caller didn't specify one already
id = newUUID().String()
request.Header.Set(xMsClientRequestID, id)
}
resp, err := next.Do(ctx, request)
if err == nil && resp != nil {
crId := resp.Response().Header.Get(xMsClientRequestID)
if crId != "" && crId != id {
err = errors.New("client Request ID from request and response does not match")
}
}
return resp, err
}
})
}
const xMsClientRequestID = "x-ms-client-request-id"
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