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depends_on.go
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depends_on.go
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package runner
import (
"fmt"
"github.com/b2wdigital/restQL-golang/v6/internal/domain"
"github.com/b2wdigital/restQL-golang/v6/pkg/restql"
"github.com/pkg/errors"
)
// ErrInvalidDependsOnTarget represents an error when a depends-on target
// references an unknown statement.
var ErrInvalidDependsOnTarget = errors.New("depends-on targets an unknown resource")
// ResolveDependsOn takes an unresolved Resource collection and
// find if a resource dependency was successfully resolved
func ResolveDependsOn(resources domain.Resources, doneResources domain.Resources) domain.Resources {
for resourceID, stmt := range resources {
resources[resourceID] = resolveDependsOnIntoStatement(stmt, doneResources)
}
return resources
}
func resolveDependsOnIntoStatement(stmt interface{}, doneResources domain.Resources) interface{} {
switch stmt := stmt.(type) {
case domain.Statement:
target := stmt.DependsOn.Target
if target == "" {
stmt.DependsOn.Resolved = true
return stmt
}
dr := doneResources[domain.ResourceID(target)]
stmt.DependsOn.Resolved = isResolved(dr)
return stmt
case []interface{}:
result := make([]interface{}, len(stmt))
for i, s := range stmt {
result[i] = resolveDependsOnIntoStatement(s, doneResources)
}
return result
default:
return stmt
}
}
func isResolved(doneResource interface{}) bool {
switch done := doneResource.(type) {
case restql.DoneResource:
return done.IgnoreErrors || (done.Status >= 200 && done.Status <= 399)
case restql.DoneResources:
resolved := false
for _, d := range done {
resolved = resolved || isResolved(d)
}
return resolved
default:
return false
}
}
// ValidateDependsOnTarget returns an error if a depends-on
// target references an unknown statement.
func ValidateDependsOnTarget(resources domain.Resources) error {
for _, stmt := range resources {
err := validateDependsOnIntoStatement(stmt, resources)
if err != nil {
return err
}
}
return nil
}
func validateDependsOnIntoStatement(stmt interface{}, resources domain.Resources) error {
switch stmt := stmt.(type) {
case domain.Statement:
target := stmt.DependsOn.Target
if target == "" {
return nil
}
_, found := resources[domain.ResourceID(target)]
if !found {
return fmt.Errorf("%w: %s", ErrInvalidDependsOnTarget, target)
}
return nil
case []interface{}:
for _, s := range stmt {
err := validateDependsOnIntoStatement(s, resources)
if err != nil {
return err
}
}
return nil
}
return nil
}