mirror of https://github.com/databricks/cli.git
cleaned up test boilerplate, added support for maps and embedded types
This commit is contained in:
Shreyas Goenka
parent
010f60d498
commit
b1e85e20f6
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@ -1,6 +1,7 @@
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package schema
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import (
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"container/list"
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"fmt"
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"reflect"
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"strings"
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@ -43,6 +44,8 @@ func NewSchema(golangType reflect.Type) (*Schema, error) {
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}, nil
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}
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// TODO: add tests for errors being triggered
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type JsType string
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const (
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@ -67,7 +70,6 @@ func javascriptType(golangType reflect.Type) (JsType, error) {
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return Number, nil
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case reflect.Struct:
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return Object, nil
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// TODO: add support for pattern properities to account for maps
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case reflect.Map:
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if golangType.Key().Kind() != reflect.String {
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return Invalid, fmt.Errorf("only strings map keys are valid. key type: %v", golangType.Key().Kind())
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@ -94,43 +96,89 @@ func errWithTrace(prefix string, trace []reflect.Type) error {
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// TODO: add tests for the error cases, forcefully triggering them
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// checks and errors out for cycles
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// wraps the error with context
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func safeToProperty(golangType reflect.Type, traceSet map[reflect.Type]struct{}, traceSlice []reflect.Type) (*Property, error) {
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traceSlice = append(traceSlice, golangType)
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// detect cycles. Fail if a cycle is detected
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// TODO: Add references here for cycles
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// TODO: move this check somewhere nicer
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_, ok := traceSet[golangType]
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if ok {
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fmt.Println("[DEBUG] traceSet: ", traceSet)
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return nil, errWithTrace("cycle detected", traceSlice)
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}
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// add current child field to history
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traceSet[golangType] = struct{}{}
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props, err := toProperity(golangType, traceSet, traceSlice)
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if err != nil {
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return nil, errWithTrace(err.Error(), traceSlice)
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}
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delete(traceSet, golangType)
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traceSlice = traceSlice[:len(traceSlice)-1]
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return props, nil
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}
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func pop(q []reflect.StructField) reflect.StructField {
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elem := q[0]
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q = q[1:]
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return elem
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}
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func push(q []reflect.StructField, r reflect.StructField) {
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q = append(q, r)
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}
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// travels anonymous embedded fields in a bfs manner to give us a list of all
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// member fields of a struct
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// simple Tree based traversal will take place because embbedded fields cannot
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// form a cycle
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func addStructFields(fields []reflect.StructField, golangType reflect.Type) []reflect.StructField {
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bfsQueue := list.New()
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for i := 0; i < golangType.NumField(); i++ {
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bfsQueue.PushBack(golangType.Field(i))
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}
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for bfsQueue.Len() > 0 {
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front := bfsQueue.Front()
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field := front.Value.(reflect.StructField)
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bfsQueue.Remove(front)
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if !field.Anonymous {
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fields = append(fields, field)
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continue
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}
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for i := 0; i < field.Type.NumField(); i++ {
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bfsQueue.PushBack(field.Type.Field(i))
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}
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}
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return fields
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}
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// TODO: add doc string explaining numHistoryOccurances
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func toProperity(golangType reflect.Type, traceSet map[reflect.Type]struct{}, traceSlice []reflect.Type) (*Property, error) {
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traceSlice = append(traceSlice, golangType)
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// *Struct and Struct generate identical json schemas
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if golangType.Kind() == reflect.Pointer {
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return toProperity(golangType.Elem(), traceSet, traceSlice)
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}
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rootJavascriptType, err := javascriptType(golangType)
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if err != nil {
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return nil, errWithTrace(err.Error(), traceSlice)
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return nil, err
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}
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// case array/slice
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var items *Item
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if golangType.Kind() == reflect.Array || golangType.Kind() == reflect.Slice {
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elemGolangType := golangType.Elem()
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elemJavascriptType, err := javascriptType(elemGolangType)
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if err != nil {
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return nil, errWithTrace(err.Error(), traceSlice)
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return nil, err
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}
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// detect cycles. Fail if a cycle is detected
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// TODO: Add references here for cycles
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_, ok := traceSet[elemGolangType]
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if ok {
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fmt.Println("[DEBUG] traceSet: ", traceSet)
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return nil, errWithTrace("cycle detected", traceSlice)
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}
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// add current child field to history
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traceSet[elemGolangType] = struct{}{}
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elemProps, err := toProperity(elemGolangType, traceSet, traceSlice)
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elemProps, err := safeToProperty(elemGolangType, traceSet, traceSlice)
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if err != nil {
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return nil, errWithTrace(err.Error(), traceSlice)
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return nil, err
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}
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items = &Item{
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// TODO: Add a test for slice of object
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Type: elemJavascriptType,
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@ -138,16 +186,24 @@ func toProperity(golangType reflect.Type, traceSet map[reflect.Type]struct{}, tr
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}
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}
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// var additionalProperties *Property
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// if golangType.Kind() == reflect.Map {
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// additionalProperties =
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// }
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// case map
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var additionalProperties *Property
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if golangType.Kind() == reflect.Map {
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if golangType.Key().Kind() != reflect.String {
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return nil, errWithTrace("only string keyed maps allowed", traceSlice)
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}
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additionalProperties, err = safeToProperty(golangType.Elem(), traceSet, traceSlice)
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if err != nil {
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return nil, err
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}
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}
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// case struct
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properities := map[string]*Property{}
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if golangType.Kind() == reflect.Struct {
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for i := 0; i < golangType.NumField(); i++ {
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child := golangType.Field(i)
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children := []reflect.StructField{}
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children = addStructFields(children, golangType)
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for _, child := range children {
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// compute child properties
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childJsonTag := child.Tag.Get("json")
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childName := strings.Split(childJsonTag, ",")[0]
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@ -157,36 +213,19 @@ func toProperity(golangType reflect.Type, traceSet map[reflect.Type]struct{}, tr
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continue
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}
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// detect cycles. Fail if a cycle is detected
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// TODO: Add references here for cycles
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_, ok := traceSet[child.Type]
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if ok {
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fmt.Println("[DEBUG] traceSet: ", traceSet)
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return nil, errWithTrace("cycle detected", traceSlice)
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}
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// add current child field to history
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traceSet[child.Type] = struct{}{}
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// recursively compute properties for this child field
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fieldProps, err := toProperity(child.Type, traceSet, traceSlice)
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fieldProps, err := safeToProperty(child.Type, traceSet, traceSlice)
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if err != nil {
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return nil, errWithTrace(err.Error(), traceSlice)
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}
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// traversal complete, delete child from history
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delete(traceSet, child.Type)
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properities[childName] = fieldProps
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}
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}
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traceSlice = traceSlice[:len(traceSlice)-1]
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return &Property{
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Type: rootJavascriptType,
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Items: items,
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Properities: properities,
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AdditionalProperities: additionalProperties,
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}, nil
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}
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@ -172,8 +172,6 @@ func TestSliceOfObjectsSchema(t *testing.T) {
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}
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type Story struct {
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Hero Person `json:"hero"`
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Villian Person `json:"villian"`
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Plot Plot `json:"plot"`
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}
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@ -189,17 +187,6 @@ func TestSliceOfObjectsSchema(t *testing.T) {
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`{
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"type": "object",
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"properties": {
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"hero": {
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"type": "object",
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"properties": {
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"age": {
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"type": "number"
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},
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"name": {
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"type": "string"
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}
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}
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},
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"plot": {
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"type": "object",
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"properties": {
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@ -218,8 +205,47 @@ func TestSliceOfObjectsSchema(t *testing.T) {
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}
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}
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}
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},
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"villian": {
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}
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}
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}`
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fmt.Println("[DEBUG] actual: ", string(jsonSchema))
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fmt.Println("[DEBUG] expected: ", expected)
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assert.Equal(t, expected, string(jsonSchema))
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}
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func TestMapOfObjectsSchema(t *testing.T) {
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type Person struct {
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Name string `json:"name"`
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Age int `json:"age,omitempty"`
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}
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type Plot struct {
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Events map[string]Person `json:"events"`
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}
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type Story struct {
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Plot Plot `json:"plot"`
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}
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elem := Story{}
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schema, err := NewSchema(reflect.TypeOf(elem))
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assert.NoError(t, err)
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jsonSchema, err := json.MarshalIndent(schema, " ", " ")
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assert.NoError(t, err)
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expected :=
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`{
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"type": "object",
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"properties": {
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"plot": {
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"type": "object",
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"properties": {
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"events": {
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"type": "object",
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"additionalProperties": {
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"type": "object",
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"properties": {
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"age": {
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@ -231,6 +257,9 @@ func TestSliceOfObjectsSchema(t *testing.T) {
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}
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}
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}
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}
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}
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}
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}`
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fmt.Println("[DEBUG] actual: ", string(jsonSchema))
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