973fccf09d
This change introduces a basic AWS Lambda resource provider. It supports C--D, but not -RU-, yet.
119 lines
2.9 KiB
Go
119 lines
2.9 KiB
Go
// Copyright 2017 Pulumi, Inc. All rights reserved.
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package resource
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"os"
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"github.com/pulumi/coconut/pkg/util/contract"
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)
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// Asset is a serialized asset reference. It is a union: thus, only one of its fields will be non-nil. Several helper
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// routines exist as members in order to easily interact with the assets referenced by an instance of this type.
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type Asset struct {
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Text *string `json:"text,omitempty"` // a textual asset.
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Path *string `json:"path,omitempty"` // a file on the current filesystem.
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URI *string `json:"uri,omitempty"` // a URI to a reference fetched (file://, http://, https://, or custom).
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}
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func (a Asset) IsText() bool { return a.Text != nil }
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func (a Asset) IsPath() bool { return a.Path != nil }
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func (a Asset) IsURI() bool { return a.URI != nil }
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func (a Asset) GetText() (string, bool) {
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if a.IsText() {
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return *a.Text, true
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}
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return "", false
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}
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func (a Asset) GetPath() (string, bool) {
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if a.IsPath() {
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return *a.Path, true
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}
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return "", false
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}
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func (a Asset) GetURI() (string, bool) {
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if a.IsURI() {
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return *a.URI, true
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}
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return "", false
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}
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// GetURIURL returns the underlying URI as a parsed URL, provided it is one. If there was an error parsing the URI, it
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// will be returned as a non-nil error object.
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func (a Asset) GetURIURL() (*url.URL, bool, error) {
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if uri, isuri := a.GetURI(); isuri {
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url, err := url.Parse(uri)
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if err != nil {
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return nil, true, err
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}
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return url, true, nil
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}
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return nil, false, nil
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}
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func (a Asset) Read() (AssetReader, error) {
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if text, istext := a.GetText(); istext {
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return newBytesReader([]byte(text)), nil
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} else if path, ispath := a.GetPath(); ispath {
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return os.Open(path)
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} else if url, isurl, err := a.GetURIURL(); isurl {
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if err != nil {
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return nil, err
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}
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switch s := url.Scheme; s {
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case "http", "https":
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resp, err := http.Get(url.String())
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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b, err := ioutil.ReadAll(resp.Body)
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if err != nil {
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return nil, err
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}
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return newBytesReader(b), nil
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case "file":
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contract.Assert(url.Host == "")
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contract.Assert(url.User == nil)
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contract.Assert(url.RawQuery == "")
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contract.Assert(url.Fragment == "")
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return os.Open(url.Path)
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default:
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return nil, fmt.Errorf("Unrecognized or unsupported URI scheme: %v", s)
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}
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}
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contract.Failf("Invalid asset; one of Text, Path, or URI must be non-nil")
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return nil, nil
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}
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// AssetReader reads an asset's contents, offering Read, Seek, and Close functionality.
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type AssetReader interface {
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io.Reader
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io.Seeker
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io.Closer
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}
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// bytesReader turns a *bytes.Reader into an AssetReader by adding an empty Close method.
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type bytesReader struct {
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*bytes.Reader
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}
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func newBytesReader(b []byte) AssetReader {
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return bytesReader{
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Reader: bytes.NewReader(b),
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}
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}
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func (b bytesReader) Close() error {
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return nil // intentionally blank
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}
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