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schema_list_diff.go
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schema_list_diff.go
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package diff
import (
"fmt"
"strings"
"github.com/getkin/kin-openapi/openapi3"
"github.com/treeverse/oasdiff/utils"
)
/*
SchemaListDiff describes the changes between a pair of lists of schema objects: https://swagger.io/specification/#schema-object
The result is a combination of two diffs:
1. Diff of schemas with a $ref: added/deleted schema names; modified=diff of schemas with the same $ref
2. Diff of schemas without a $ref (inline schemas): added/deleted schemas (base/revision + index in the list of schemas); modified=only if exactly one schema was added and one deleted, the Modified field will show a diff between them
*/
type SchemaListDiff struct {
Added utils.StringList `json:"added,omitempty" yaml:"added,omitempty"`
Deleted utils.StringList `json:"deleted,omitempty" yaml:"deleted,omitempty"`
Modified ModifiedSchemas `json:"modified,omitempty" yaml:"modified,omitempty"`
}
// Empty indicates whether a change was found in this element
func (diff *SchemaListDiff) Empty() bool {
if diff == nil {
return true
}
return len(diff.Added) == 0 &&
len(diff.Deleted) == 0 &&
len(diff.Modified) == 0
}
func getSchemaListsDiff(config *Config, state *state, schemaRefs1, schemaRefs2 openapi3.SchemaRefs) (*SchemaListDiff, error) {
diff, err := getSchemaListsDiffInternal(config, state, schemaRefs1, schemaRefs2)
if err != nil {
return nil, err
}
if diff.Empty() {
return nil, nil
}
return diff, nil
}
func (diff SchemaListDiff) combine(other SchemaListDiff) (*SchemaListDiff, error) {
return &SchemaListDiff{
Added: append(diff.Added, other.Added...),
Deleted: append(diff.Deleted, other.Deleted...),
Modified: diff.Modified.combine(other.Modified),
}, nil
}
func getSchemaListsDiffInternal(config *Config, state *state, schemaRefs1, schemaRefs2 openapi3.SchemaRefs) (*SchemaListDiff, error) {
if len(schemaRefs1) == 0 && len(schemaRefs2) == 0 {
return nil, nil
}
diffRefs, err := getSchemaListsRefsDiff(config, state, schemaRefs1, schemaRefs2, isSchemaRef)
if err != nil {
return nil, err
}
diffInline, err := getSchemaListsInlineDiff(config, state, schemaRefs1, schemaRefs2, isSchemaInline)
if err != nil {
return nil, err
}
return diffRefs.combine(diffInline)
}
type schemaRefsFilter func(schemaRef *openapi3.SchemaRef) bool
// getSchemaListsRefsDiff compares schemas by $ref name
func getSchemaListsRefsDiff(config *Config, state *state, schemaRefs1, schemaRefs2 openapi3.SchemaRefs, filter schemaRefsFilter) (SchemaListDiff, error) {
added := utils.StringList{}
deleted := utils.StringList{}
modified := ModifiedSchemas{}
schemaMap2 := toSchemaRefMap(schemaRefs2, filter)
for _, schema1 := range schemaRefs1 {
if !filter(schema1) {
continue
}
ref := schema1.Ref
if schema2, found := schemaMap2[ref]; found {
schemaMap2.delete(ref)
if err := modified.addSchemaDiff(config, state, ref, schema1, schema2.schemaRef); err != nil {
return SchemaListDiff{}, err
}
} else {
schemaName := ref[strings.LastIndex(ref, "/")+1:]
deleted = append(deleted, schemaName)
}
}
schemaMap1 := toSchemaRefMap(schemaRefs1, filter)
for _, schema2 := range schemaRefs2 {
if !filter(schema2) {
continue
}
ref := schema2.Ref
if _, found := schemaMap1[ref]; found {
schemaMap1.delete(ref)
} else {
schemaName := ref[strings.LastIndex(ref, "/")+1:]
added = append(added, schemaName)
}
}
return SchemaListDiff{
Added: added,
Deleted: deleted,
Modified: modified,
}, nil
}
// getSchemaListsRefsDiff compares schemas by their syntax
func getSchemaListsInlineDiff(config *Config, state *state, schemaRefs1, schemaRefs2 openapi3.SchemaRefs, filter schemaRefsFilter) (SchemaListDiff, error) {
addedIdx, addedSchemas, err := getGroupDiffForInlineSchemas(config, state, schemaRefs2, schemaRefs1, filter, "RevisionSchema")
if err != nil {
return SchemaListDiff{}, err
}
deletedIdx, deletedSchemas, err := getGroupDiffForInlineSchemas(config, state, schemaRefs1, schemaRefs2, filter, "BaseSchema")
if err != nil {
return SchemaListDiff{}, err
}
if len(addedIdx) == 1 && len(deletedIdx) == 1 {
d, err := getSchemaDiff(config, state, schemaRefs1[deletedIdx[0]], schemaRefs2[addedIdx[0]])
if err != nil {
return SchemaListDiff{}, err
}
if d.Empty() {
return SchemaListDiff{}, err
}
return SchemaListDiff{
Modified: ModifiedSchemas{fmt.Sprintf("#%d", 1+deletedIdx[0]): d},
}, nil
}
return SchemaListDiff{
Added: addedSchemas,
Deleted: deletedSchemas,
}, nil
}
func getGroupDiffForInlineSchemas(config *Config, state *state, schemaRefs1, schemaRefs2 openapi3.SchemaRefs, filter schemaRefsFilter, inlineSchemaPrefix string) ([]int, []string, error) {
notContainedIdx := []int{}
notContainedSchemas := []string{}
matched := map[int]struct{}{}
for index1, schemaRef1 := range schemaRefs1 {
if !filter(schemaRef1) {
continue
}
if found, index2, err := findIndenticalSchema(config, state, schemaRef1, schemaRefs2, matched, filter); err != nil {
return nil, nil, err
} else if !found {
notContainedIdx = append(notContainedIdx, index1)
schemaName := fmt.Sprintf("%s[%d]", inlineSchemaPrefix, index1)
notContainedSchemas = append(notContainedSchemas, schemaName)
} else {
matched[index2] = struct{}{}
}
}
return notContainedIdx, notContainedSchemas, nil
}
func findIndenticalSchema(config *Config, state *state, schemaRef1 *openapi3.SchemaRef, schemasRefs2 openapi3.SchemaRefs, matched map[int]struct{}, filter schemaRefsFilter) (bool, int, error) {
for index2, schemaRef2 := range schemasRefs2 {
if !filter(schemaRef1) {
continue
}
if alreadyMatched(index2, matched) {
continue
}
if schemaDiff, err := getSchemaDiff(config, state, schemaRef1, schemaRef2); err != nil {
return false, 0, err
} else if schemaDiff.Empty() {
return true, index2, nil
}
}
return false, 0, nil
}
func alreadyMatched(index int, matched map[int]struct{}) bool {
_, found := matched[index]
return found
}
func isSchemaInline(schemaRef *openapi3.SchemaRef) bool {
if schemaRef == nil {
return false
}
return schemaRef.Ref == ""
}
func isSchemaRef(schemaRef *openapi3.SchemaRef) bool {
if schemaRef == nil {
return false
}
return schemaRef.Ref != ""
}