bundle validate: new alpha flag --output=<text|json-alpha1> to format results

changelog/fragments/json-hidden-flag.yaml

@@ -0,0 +1,16 @@
+# entries is a list of entries to include in
+# release notes and/or the migration guide
+entries:
+  - description: >
+      Add new hidden alpha flag `--output` to print the result of `operator-sdk bundle validate` in JSON format to stdout. Logs are printed to stderr.
+
+    # kind is one of:
+    # - addition
+    # - change
+    # - deprecation
+    # - removal
+    # - bugfix
+    kind: "addition"
+
+    # Is this a breaking change?
+    breaking: false

cmd/operator-sdk/bundle/internal/logger.go

@@ -0,0 +1,28 @@
+// Copyright 2020 The Operator-SDK Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+import (
+	"io"
+
+	log "github.com/sirupsen/logrus"
+)
+
+// NewLoggerTo returns a logger that writes logs to w.
+func NewLoggerTo(w io.Writer) *log.Logger {
+	logger := log.New()
+	logger.SetOutput(w)
+	return logger
+}

cmd/operator-sdk/bundle/internal/result.go

@@ -0,0 +1,166 @@
+// Copyright 2020 The Operator-SDK Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package internal
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"os"
+
+	registrybundle "github.com/operator-framework/operator-registry/pkg/lib/bundle"
+	"github.com/sirupsen/logrus"
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	JSONAlpha1 = "json-alpha1"
+	Text       = "text"
+)
+
+// Result represents the final result
+type Result struct {
+	Passed  bool     `json:"passed"`
+	Outputs []output `json:"outputs"`
+}
+
+// output represents the logs which are used to return the final result in the JSON format
+type output struct {
+	Type    string `json:"type"`
+	Message string `json:"message"`
+}
+
+// NewResult return a new result object which starts with passed == true since has no errors
+func NewResult() Result {
+	return Result{Passed: true}
+}
+
+// AddInfo will add a log to the result with the Info Level
+func (o *Result) AddInfo(msg string) {
+	o.Outputs = append(o.Outputs, output{
+		Type:    logrus.InfoLevel.String(),
+		Message: msg,
+	})
+}
+
+// AddError will add a log to the result with the Error Level
+func (o *Result) AddError(err error) {
+	verr := registrybundle.ValidationError{}
+	if errors.As(err, &verr) {
+		for _, valErr := range verr.Errors {
+			o.Outputs = append(o.Outputs, output{
+				Type:    logrus.ErrorLevel.String(),
+				Message: valErr.Error(),
+			})
+		}
+	} else {
+		o.Outputs = append(o.Outputs, output{
+			Type:    logrus.ErrorLevel.String(),
+			Message: err.Error(),
+		})
+	}
+	o.Passed = false
+}
+
+// AddWarn will add a log to the result with the Warn Level
+func (o *Result) AddWarn(err error) {
+	o.Outputs = append(o.Outputs, output{
+		Type:    logrus.WarnLevel.String(),
+		Message: err.Error(),
+	})
+}
+
+// printText will print the output in human readable format
+func (o *Result) printText(logger *logrus.Entry) error {
+	for _, obj := range o.Outputs {
+		lvl, err := logrus.ParseLevel(obj.Type)
+		if err != nil {
+			return err
+		}
+		switch lvl {
+		case logrus.InfoLevel:
+			logger.Info(obj.Message)
+		case logrus.WarnLevel:
+			logger.Warn(obj.Message)
+		case logrus.ErrorLevel:
+			logger.Error(obj.Message)
+		default:
+			return fmt.Errorf("unknown output level %q", obj.Type)
+		}
+	}
+
+	return nil
+}
+
+// printJSON will print the output in JSON format
+func (o *Result) printJSON() error {
+	prettyJSON, err := json.MarshalIndent(o, "", "    ")
+	if err != nil {
+		return fmt.Errorf("error marshaling JSON output: %v", err)
+	}
+	fmt.Printf("%s\n", string(prettyJSON))
+	return nil
+}
+
+// prepare should be used when writing an Result to a non-log writer.
+// it will ensure that the passed boolean will properly set in the case of the setters were not properly used
+func (o *Result) prepare() error {
+	o.Passed = true
+	for i, obj := range o.Outputs {
+		lvl, err := logrus.ParseLevel(obj.Type)
+		if err != nil {
+			return err
+		}
+		if o.Passed && lvl == logrus.ErrorLevel {
+			o.Passed = false
+		}
+		lvlBytes, _ := lvl.MarshalText()
+		o.Outputs[i].Type = string(lvlBytes)
+	}
+	return nil
+}
+
+// PrintWithFormat prints output to w in format, and exits if some object in output
+// is not in a passing state.
+func (o *Result) PrintWithFormat(format string) (err error) {
+	// the prepare will ensure the result data if the setters were not used
+	if err = o.prepare(); err != nil {
+		return fmt.Errorf("error to prepare output: %v", err)
+	}
+
+	printf := o.getPrintFuncFormat(format)
+	if err = printf(*o); err == nil && !o.Passed {
+		os.Exit(1) // Exit with error when any Error type was added
+	}
+	return err
+}
+
+// getPrintFuncFormat returns a function that writes an Result to w in a given
+// format, defaulting to "text" if format is not recognized.
+func (o *Result) getPrintFuncFormat(format string) func(Result) error {
+	// PrintWithFormat output in desired format.
+	switch format {
+	case JSONAlpha1:
+		return func(o Result) error {
+			return o.printJSON()
+		}
+	}
+
+	// Address all to the Stdout when the type is not JSON
+	logger := log.NewEntry(NewLoggerTo(os.Stdout))
+	return func(o Result) error {
+		return o.printText(logger)
+	}
+}