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aggregators.go
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aggregators.go
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package eval
import (
"fmt"
"github.com/b2wdigital/restQL-golang/v6/internal/domain"
"github.com/b2wdigital/restQL-golang/v6/pkg/restql"
"github.com/imdario/mergo"
"github.com/pkg/errors"
)
// ApplyAggregators resolves the `in` keyword in the query,
// taking values from one statement result than setting it
// on target statement result.
func ApplyAggregators(log restql.Logger, query domain.Query, resources domain.Resources) domain.Resources {
for _, stmt := range query.Statements {
if len(stmt.In) == 0 {
continue
}
target := stmt.In[0]
path := stmt.In[1:]
originResourceID := domain.NewResourceID(stmt)
originResource := resources[originResourceID]
targetResourceID := domain.ResourceID(target)
targetResource := resources[targetResourceID]
err := aggregateOriginOnTarget(path, originResource, targetResource)
if err != nil {
log.Error("an error occurred when aggregating the resources", err)
continue
}
resources[originResourceID] = cleanOriginResult(originResource)
}
return resources
}
func aggregateOriginOnTarget(path []string, origin interface{}, target interface{}) error {
switch target := target.(type) {
case restql.DoneResource:
body := target.ResponseBody.Unmarshal()
return aggregateOriginOnTarget(path, origin, body)
case restql.DoneResources:
return aggregateOriginOnListTarget(path, origin, target)
case []interface{}:
return aggregateOriginOnListTarget(path, origin, target)
case map[string]interface{}:
field := path[0]
nextTarget, targetFieldExist := target[field]
if !targetFieldExist {
nextTarget = make(map[string]interface{})
target[field] = nextTarget
}
if len(path) > 1 {
return aggregateOriginOnTarget(path[1:], origin, nextTarget)
}
originValue := parseOrigin(origin)
if !targetFieldExist {
target[field] = originValue
return nil
}
targetValue := target[field]
merged, err := merge(targetValue, originValue)
if err != nil {
return err
}
target[field] = merged
return nil
default:
return errors.Errorf("unknown target type: %T", target)
}
}
func merge(target interface{}, origin interface{}) (interface{}, error) {
switch target := target.(type) {
case map[string]interface{}:
return mergeInObject(target, origin)
case []interface{}:
return mergeInList(target, origin)
default:
return target, errors.Errorf("invalid target type for merge: %T", target)
}
}
func mergeInObject(target map[string]interface{}, origin interface{}) (interface{}, error) {
switch origin := origin.(type) {
case map[string]interface{}:
err := mergo.Merge(&target, origin, mergo.WithOverride, mergo.WithSliceDeepCopy)
return target, err
default:
return target, errors.Errorf("invalid origin type for merge into object: %T", origin)
}
}
func mergeInList(target []interface{}, origin interface{}) (interface{}, error) {
switch origin := origin.(type) {
case []interface{}:
size := max(len(target), len(origin))
l := make([]interface{}, size)
for i := 0; i < size; i++ {
if i > len(target)-1 {
l[i] = origin[i]
continue
}
if i > len(origin)-1 {
l[i] = target[i]
continue
}
merged, err := merge(target[i], origin[i])
if err != nil {
return target, err
}
l[i] = merged
}
return l, nil
default:
return target, errors.Errorf("invalid origin type for merge into list: %T", origin)
}
}
func max(a int, b int) int {
if a > b {
return a
}
return b
}
func aggregateOriginOnListTarget(path []string, origin interface{}, target []interface{}) error {
switch origin := origin.(type) {
case restql.DoneResource:
body := origin.ResponseBody.Unmarshal()
return aggregateOriginOnTarget(path, body, target)
case restql.DoneResources:
var err error
for i, t := range target {
aggregateErr := aggregateOriginOnTarget(path, origin[i], t)
if aggregateErr != nil {
err = fmt.Errorf("failed to aggregate multiplexed resource into target: %v\n%w", aggregateErr, err)
}
}
return err
case []interface{}:
var err error
for i, t := range target {
aggregateErr := aggregateOriginOnTarget(path, origin[i], t)
if aggregateErr != nil {
err = fmt.Errorf("failed to aggregate multiplexed resource into target: %v\n%w", aggregateErr, err)
}
}
return err
default:
var err error
for _, t := range target {
aggregateErr := aggregateOriginOnTarget(path, origin, t)
if aggregateErr != nil {
err = fmt.Errorf("failed to aggregate multiplexed resource into target: %v\n%w", aggregateErr, err)
}
}
return err
}
}
func parseOrigin(origin interface{}) interface{} {
switch origin := origin.(type) {
case restql.DoneResource:
body := origin.ResponseBody.Unmarshal()
return body
case restql.DoneResources:
result := make([]interface{}, len(origin))
for i, o := range origin {
result[i] = parseOrigin(o)
}
return result
default:
return origin
}
}
func cleanOriginResult(origin interface{}) interface{} {
switch origin := origin.(type) {
case restql.DoneResource:
origin.ResponseBody.Clear()
return origin
case restql.DoneResources:
result := make(restql.DoneResources, len(origin))
for i, o := range origin {
result[i] = cleanOriginResult(o)
}
return result
default:
return nil
}
}