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comparison.go
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comparison.go
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// Copyright 2018 Istio 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 galley
import (
"encoding/json"
"fmt"
multierror "github.com/hashicorp/go-multierror"
"github.com/pmezard/go-difflib/difflib"
)
type comparisonResult struct {
actual map[string]interface{}
expected map[string]interface{}
extraActual []string
missingExpected []string
conflicting []string
}
func (r *comparisonResult) generateError() (err error) {
for _, n := range r.missingExpected {
js, er := json.MarshalIndent(r.expected[n], "", " ")
if er != nil {
return er
}
err = multierror.Append(err, fmt.Errorf("expected resource not found: %s\n%v", n, string(js)))
}
for _, n := range r.extraActual {
js, er := json.MarshalIndent(r.actual[n], "", " ")
if er != nil {
return er
}
err = multierror.Append(err, fmt.Errorf("extra resource found: %s\n%v", n, string(js)))
}
for _, n := range r.conflicting {
ajs, er := json.MarshalIndent(r.actual[n], "", " ")
if er != nil {
return er
}
ejs, er := json.MarshalIndent(r.expected[n], "", " ")
if er != nil {
return er
}
diff := difflib.UnifiedDiff{
FromFile: fmt.Sprintf("Expected %q", n),
A: difflib.SplitLines(string(ejs)),
ToFile: fmt.Sprintf("Actual %q", n),
B: difflib.SplitLines(string(ajs)),
Context: 100,
}
text, er := difflib.GetUnifiedDiffString(diff)
if er != nil {
return er
}
err = multierror.Append(err, fmt.Errorf("resource mismatch: %q\n%s",
n, text))
}
return multierror.Append(err).ErrorOrNil()
}