add json output formatter

go.mod

@@ -22,7 +22,7 @@ require (
 	github.com/spf13/jwalterweatherman v0.0.0-20180814060501-14d3d4c51834 // indirect
 	github.com/spf13/pflag v0.0.0-20180821114517-d929dcbb1086 // indirect
 	github.com/spf13/viper v1.1.0
-	github.com/stretchr/testify v1.3.0 // indirect
+	github.com/stretchr/testify v1.3.0
 	github.com/xeipuuv/gojsonpointer v0.0.0-20180127040702-4e3ac2762d5f // indirect
 	github.com/xeipuuv/gojsonreference v0.0.0-20180127040603-bd5ef7bd5415 // indirect
 	github.com/xeipuuv/gojsonschema v0.0.0-20180816142147-da425ebb7609

kubeval/output.go

@@ -1,7 +1,12 @@
 package kubeval
 
 import (
-	"github.com/instrumenta/kubeval/log"
+	"bytes"
+	"encoding/json"
+	"log"
+	"os"
+
+	kLog "github.com/instrumenta/kubeval/log"
 )
 
 // TODO (brendanryan) move these structs to `/log` once we have removed the potential
@@ -25,16 +30,16 @@ func NewSTDOutputManager() *STDOutputManager {
 
 func (s *STDOutputManager) Put(result ValidationResult) error {
 	if len(result.Errors) > 0 {
-		log.Warn("The file", result.FileName, "contains an invalid", result.Kind)
+		kLog.Warn("The file", result.FileName, "contains an invalid", result.Kind)
 		for _, desc := range result.Errors {
-			log.Info("--->", desc)
+			kLog.Info("--->", desc)
 		}
 	} else if result.Kind == "" {
-		log.Success("The file", result.FileName, "contains an empty YAML document")
+		kLog.Success("The file", result.FileName, "contains an empty YAML document")
 	} else if !result.ValidatedAgainstSchema {
-		log.Warn("The file", result.FileName, "containing a", result.Kind, "was not validated against a schema")
+		kLog.Warn("The file", result.FileName, "containing a", result.Kind, "was not validated against a schema")
 	} else {
-		log.Success("The file", result.FileName, "contains a valid", result.Kind)
+		kLog.Success("The file", result.FileName, "contains a valid", result.Kind)
 	}
 
 	return nil
@@ -44,3 +49,87 @@ func (s *STDOutputManager) Flush() error {
 	// no op
 	return nil
 }
+
+type status string
+
+const (
+	statusInvalid = "invalid"
+	statusValid   = "valid"
+	statusSkipped = "skipped"
+)
+
+type jsonEvalResult struct {
+	Filename string   `json:"filename"`
+	Kind     string   `json:"kind"`
+	Status   status   `json:"status"`
+	Errors   []string `json:"errors"`
+}
+
+// jsonOutputManager reports `ccheck` results to `stdout` as a json array..
+type jsonOutputManager struct {
+	logger *log.Logger
+
+	data []jsonEvalResult
+}
+
+func newDefaultJSONOutputManager() *jsonOutputManager {
+	return newJSONOutputManager(log.New(os.Stdout, "", 0))
+}
+
+func newJSONOutputManager(l *log.Logger) *jsonOutputManager {
+	return &jsonOutputManager{
+		logger: l,
+	}
+}
+
+func getStatus(r ValidationResult) status {
+	if r.Kind == "" {
+		return statusSkipped
+	}
+
+	if !r.ValidatedAgainstSchema {
+		return statusSkipped
+	}
+
+	if len(r.Errors) > 0 {
+		return statusInvalid
+	}
+
+	return statusValid
+}
+
+func (j *jsonOutputManager) put(r ValidationResult) error {
+
+	// stringify gojsonschema errors
+	// use a pre-allocated slice to ensure the json will have an
+	// empty array in the "zero" case
+	errs := make([]string, 0, len(r.Errors))
+	for _, e := range r.Errors {
+		errs = append(errs, e.String())
+	}
+
+	j.data = append(j.data, jsonEvalResult{
+		Filename: r.FileName,
+		Kind:     r.Kind,
+		Status:   getStatus(r),
+		Errors:   errs,
+	})
+
+	return nil
+}
+
+func (j *jsonOutputManager) flush() error {
+	b, err := json.Marshal(j.data)
+	if err != nil {
+		return err
+	}
+
+	var out bytes.Buffer
+	err = json.Indent(&out, b, "", "\t")
+	if err != nil {
+		return err
+	}
+
+	j.logger.Print(out.String())
+	return nil
+}

kubeval/output_test.go

@@ -0,0 +1,123 @@
+package kubeval
+
+import (
+	"bytes"
+	"log"
+	"testing"
+
+	"github.com/xeipuuv/gojsonschema"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func newResultError(msg string) gojsonschema.ResultError {
+	r := &gojsonschema.ResultErrorFields{}
+
+	r.SetContext(gojsonschema.NewJsonContext("error", nil))
+	r.SetDescription(msg)
+
+	return r
+}
+
+func newResultErrors(msgs []string) []gojsonschema.ResultError {
+	var res []gojsonschema.ResultError
+	for _, m := range msgs {
+		res = append(res, newResultError(m))
+	}
+	return res
+}
+
+func Test_jsonOutputManager_put(t *testing.T) {
+	type args struct {
+		vr ValidationResult
+	}
+
+	tests := []struct {
+		msg    string
+		args   args
+		exp    string
+		expErr error
+	}{
+		{
+			msg: "empty input",
+			args: args{
+				vr: ValidationResult{},
+			},
+			exp: `[
+	{
+		"filename": "",
+		"kind": "",
+		"status": "skipped",
+		"errors": []
+	}
+]
+`,
+		},
+		{
+			msg: "file with no errors",
+			args: args{
+				vr: ValidationResult{
+					FileName:               "deployment.yaml",
+					Kind:                   "deployment",
+					ValidatedAgainstSchema: true,
+					Errors:                 nil,
+				},
+			},
+			exp: `[
+	{
+		"filename": "deployment.yaml",
+		"kind": "deployment",
+		"status": "valid",
+		"errors": []
+	}
+]
+`,
+		},
+		{
+			msg: "file with errors",
+			args: args{
+				vr: ValidationResult{
+					FileName:               "service.yaml",
+					Kind:                   "service",
+					ValidatedAgainstSchema: true,
+					Errors: newResultErrors([]string{
+						"i am a error",
+						"i am another error",
+					}),
+				},
+			},
+			exp: `[
+	{
+		"filename": "service.yaml",
+		"kind": "service",
+		"status": "invalid",
+		"errors": [
+			"error: i am a error",
+			"error: i am another error"
+		]
+	}
+]
+`,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.msg, func(t *testing.T) {
+			buf := new(bytes.Buffer)
+			s := newJSONOutputManager(log.New(buf, "", 0))
+
+			// record results
+			err := s.put(tt.args.vr)
+			if err != nil {
+				assert.Equal(t, tt.expErr, err)
+			}
+
+			// flush final buffer
+			err = s.flush()
+			if err != nil {
+				assert.Equal(t, tt.expErr, err)
+			}
+
+			assert.Equal(t, tt.exp, buf.String())
+		})
+	}
+}