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json.go
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json.go
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package matchers
import (
"github.com/onsi/gomega/types"
"github.com/pkg/errors"
"github.com/weaveworks/eksctl/pkg/cfn/manager"
"encoding/json"
)
// BeNodeGroupsWithNamesWhich helps match JSON-formatted nodegroups by
// accepting matchers on an array of nodegroup names.
func BeNodeGroupsWithNamesWhich(matchers ...types.GomegaMatcher) types.GomegaMatcher {
return &jsonNodeGroupMatcher{
matchers: matchers,
}
}
type jsonNodeGroupMatcher struct {
matchers []types.GomegaMatcher
failureMessage string
negatedFailureMessage string
}
func (matcher *jsonNodeGroupMatcher) Match(actual interface{}) (success bool, err error) {
rawJSON, ok := actual.(string)
if !ok {
return false, errors.Wrapf(err, "BeNodeGroupsWithNamesWhich matcher expects a string")
}
ngSummaries := []manager.NodeGroupSummary{}
if err := json.Unmarshal([]byte(rawJSON), &ngSummaries); err != nil {
return false, errors.Wrapf(err, "BeNodeGroupsWithNamesWhich matcher expects a NodeGroupSummary JSON array")
}
ngNames := extractNames(ngSummaries)
for _, m := range matcher.matchers {
if ok, err := m.Match(ngNames); !ok {
matcher.failureMessage = m.FailureMessage(ngNames)
matcher.negatedFailureMessage = m.NegatedFailureMessage(ngNames)
return false, err
}
}
return true, nil
}
func extractNames(ngSummaries []manager.NodeGroupSummary) []string {
ngNames := make([]string, len(ngSummaries))
for i, ngSummary := range ngSummaries {
ngNames[i] = ngSummary.Name
}
return ngNames
}
func (matcher *jsonNodeGroupMatcher) FailureMessage(unusedActual interface{}) string {
return matcher.failureMessage
}
func (matcher *jsonNodeGroupMatcher) NegatedFailureMessage(unusedActual interface{}) string {
return matcher.negatedFailureMessage
}