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Support jmespath for references with jmes: prefix #331

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Support jmespath for references with jmes: prefix #331

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100 changes: 63 additions & 37 deletions pkg/graph/lib.go
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ import (
"sort"
"strings"

"github.com/jmespath/go-jmespath"
"gomodules.xyz/jsonpath"
core "k8s.io/api/core/v1"
kerr "k8s.io/apimachinery/pkg/api/errors"
Expand Down Expand Up @@ -304,25 +305,19 @@ func (finder ObjectFinder) ResourcesFor(src *unstructured.Unstructured, e *Edge)
// TODO: check that namespacePath must be empty

var out []*unstructured.Unstructured

for _, reference := range e.Connection.References {
j := jsonpath.New("jsonpath")
j.AllowMissingKeys(true)
err := j.Parse(reference)
if err != nil {
return nil, fmt.Errorf("fails to parse reference %q between %s -> %s. err:%v", e.Connection.References, e.Src, e.Dst, err)
}
buf := new(bytes.Buffer)
err = j.Execute(buf, src.Object)
if err != nil {
return nil, fmt.Errorf("fails to execute reference %q between %s -> %s. err:%v", e.Connection.References, e.Src, e.Dst, err)
}
r := csv.NewReader(buf)
// Mapper.Comma = ';'
r.Comment = '#'
records, err := r.ReadAll()
if err != nil {
return nil, err
var records [][]string
var err error
if strings.HasPrefix(reference, "jmes:") {
records, err = execJmesPath(src.Object, reference[5:], e.Src, e.Dst)
if err != nil {
return nil, err
}
} else {
records, err = execJsonPath(src.Object, reference, e.Src, e.Dst)
if err != nil {
return nil, err
}
}
refs, err := ParseResourceRefs(records)
if err != nil {
Expand Down Expand Up @@ -509,25 +504,18 @@ func (finder ObjectFinder) ResourcesFor(src *unstructured.Unstructured, e *Edge)
rs := result.Items[i]

for _, reference := range e.Connection.References {

j := jsonpath.New("jsonpath")
j.AllowMissingKeys(true)
err := j.Parse(reference)
if err != nil {
return nil, fmt.Errorf("fails to parse reference %q between %s -> %s. err:%v", e.Connection.References, e.Src, e.Dst, err)
}

buf := new(bytes.Buffer)
err = j.Execute(buf, rs.Object)
if err != nil {
return nil, fmt.Errorf("fails to execute reference %q between %s -> %s. err:%v", e.Connection.References, e.Src, e.Dst, err)
}
r := csv.NewReader(buf)
// Mapper.Comma = ';'
r.Comment = '#'
records, err := r.ReadAll()
if err != nil {
return nil, err
var records [][]string
var err error
if strings.HasPrefix(reference, "jmes:") {
records, err = execJmesPath(rs.Object, reference[5:], e.Src, e.Dst)
if err != nil {
return nil, err
}
} else {
records, err = execJsonPath(rs.Object, reference, e.Src, e.Dst)
if err != nil {
return nil, err
}
}
refs, err := ParseResourceRefs(records)
if err != nil {
Expand Down Expand Up @@ -581,6 +569,44 @@ func (finder ObjectFinder) ResourcesFor(src *unstructured.Unstructured, e *Edge)
return nil, nil
}

func execJmesPath(data any, reference string, src, dst schema.GroupVersionKind) ([][]string, error) {
result, err := jmespath.Search(reference, data)
if err != nil {
return nil, fmt.Errorf("fails to execute jmes reference %q between %s -> %s. err:%w", reference, src, dst, err)
}
switch v := result.(type) {
case string:
return [][]string{{v}}, nil
case []string:
out := make([][]string, len(v))
for i, s := range v {
out[i] = []string{s}
}
return out, nil
case [][]string:
return v, nil
}
return nil, fmt.Errorf("invalid result type %T for jmes reference %q between %s -> %s", result, reference, src, dst)
}

func execJsonPath(data any, reference string, src, dst schema.GroupVersionKind) ([][]string, error) {
j := jsonpath.New("jsonpath")
j.AllowMissingKeys(true)
err := j.Parse(reference)
if err != nil {
return nil, fmt.Errorf("fails to parse reference %q between %s -> %s. err:%v", reference, src, dst, err)
}
buf := new(bytes.Buffer)
err = j.Execute(buf, data)
if err != nil {
return nil, fmt.Errorf("fails to execute reference %q between %s -> %s. err:%v", reference, src, dst, err)
}
r := csv.NewReader(buf)
// Mapper.Comma = ';'
r.Comment = '#'
return r.ReadAll()
}

func isConnected(conn rsapi.OwnershipLevel, obj *unstructured.Unstructured, owner *unstructured.Unstructured) bool {
switch conn {
case rsapi.Controller:
Expand Down
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