|
| 1 | +package jsonnet |
| 2 | + |
| 3 | +import ( |
| 4 | + "io/ioutil" |
| 5 | + "path/filepath" |
| 6 | + |
| 7 | + jsonnet "github.com/google/go-jsonnet" |
| 8 | + "github.com/google/go-jsonnet/ast" |
| 9 | + "github.com/google/go-jsonnet/toolutils" |
| 10 | + "github.com/pkg/errors" |
| 11 | + |
| 12 | + "github.com/grafana/tanka/pkg/jpath" |
| 13 | + "github.com/grafana/tanka/pkg/native" |
| 14 | +) |
| 15 | + |
| 16 | +// TransitiveImports returns all recursive imports of a file |
| 17 | +func TransitiveImports(filename string) ([]string, error) { |
| 18 | + sonnet, err := ioutil.ReadFile(filename) |
| 19 | + if err != nil { |
| 20 | + return nil, errors.Wrap(err, "opening file") |
| 21 | + } |
| 22 | + |
| 23 | + jpath, _, _, err := jpath.Resolve(filepath.Dir(filename)) |
| 24 | + if err != nil { |
| 25 | + return nil, errors.Wrap(err, "resolving JPATH") |
| 26 | + } |
| 27 | + importer := jsonnet.FileImporter{ |
| 28 | + JPaths: jpath, |
| 29 | + } |
| 30 | + |
| 31 | + vm := jsonnet.MakeVM() |
| 32 | + vm.Importer(&importer) |
| 33 | + for _, nf := range native.Funcs() { |
| 34 | + vm.NativeFunction(nf) |
| 35 | + } |
| 36 | + |
| 37 | + node, err := jsonnet.SnippetToAST("main.jsonnet", string(sonnet)) |
| 38 | + if err != nil { |
| 39 | + return nil, errors.Wrap(err, "creating Jsonnet AST") |
| 40 | + } |
| 41 | + |
| 42 | + imports := make([]string, 0, 0) |
| 43 | + err = importRecursive(&imports, vm, node, "main.jsonnet") |
| 44 | + |
| 45 | + return uniqueStringSlice(imports), err |
| 46 | +} |
| 47 | + |
| 48 | +// importRecursive takes a Jsonnet VM and recursively imports the AST. Every |
| 49 | +// found import is added to the `list` string slice, which will ultimately |
| 50 | +// contain all recursive imports |
| 51 | +func importRecursive(list *[]string, vm *jsonnet.VM, node ast.Node, currentPath string) error { |
| 52 | + switch node := node.(type) { |
| 53 | + // we have an `import` |
| 54 | + case *ast.Import: |
| 55 | + p := node.File.Value |
| 56 | + |
| 57 | + contents, foundAt, err := vm.ImportAST(currentPath, p) |
| 58 | + if err != nil { |
| 59 | + return errors.Wrap(err, "importing jsonnet") |
| 60 | + } |
| 61 | + |
| 62 | + *list = append(*list, foundAt) |
| 63 | + |
| 64 | + if err := importRecursive(list, vm, contents, foundAt); err != nil { |
| 65 | + return err |
| 66 | + } |
| 67 | + |
| 68 | + // we have an `importstr` |
| 69 | + case *ast.ImportStr: |
| 70 | + p := node.File.Value |
| 71 | + |
| 72 | + foundAt, err := vm.ResolveImport(currentPath, p) |
| 73 | + if err != nil { |
| 74 | + return errors.Wrap(err, "importing string") |
| 75 | + } |
| 76 | + |
| 77 | + *list = append(*list, foundAt) |
| 78 | + |
| 79 | + // neither `import` nor `importstr`, probably object or similar: try children |
| 80 | + default: |
| 81 | + for _, child := range toolutils.Children(node) { |
| 82 | + if err := importRecursive(list, vm, child, currentPath); err != nil { |
| 83 | + return err |
| 84 | + } |
| 85 | + } |
| 86 | + } |
| 87 | + return nil |
| 88 | +} |
| 89 | + |
| 90 | +func uniqueStringSlice(s []string) []string { |
| 91 | + seen := make(map[string]struct{}, len(s)) |
| 92 | + j := 0 |
| 93 | + for _, v := range s { |
| 94 | + if _, ok := seen[v]; ok { |
| 95 | + continue |
| 96 | + } |
| 97 | + seen[v] = struct{}{} |
| 98 | + s[j] = v |
| 99 | + j++ |
| 100 | + } |
| 101 | + return s[:j] |
| 102 | +} |
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