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expand.go
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expand.go
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package runner
import (
"math"
"github.com/b2wdigital/restQL-golang/v4/internal/domain"
)
const (
valuesParamType string = "values"
bodyParamType = "body"
)
type parameter struct {
paramType string
path []string
value interface{}
}
type listParameters struct {
paramType string
path []string
value []interface{}
}
// MultiplexStatements creates a statement for each value in a
// list parameter value.
// In case of multiple list parameter values it makes the cartesian
// product of all the lists and makes a statement for each value in a
// result product.
func MultiplexStatements(resources domain.Resources) domain.Resources {
for resourceID, stmt := range resources {
switch stmt := stmt.(type) {
case domain.Statement:
resources[resourceID] = multiplex(stmt)
default:
resources[resourceID] = stmt
}
}
return resources
}
func multiplex(statement domain.Statement) interface{} {
values := statement.With.Values
body := statement.With.Body
if values == nil && body == nil {
return statement
}
listParams := getListParamsFromValues(values)
bodyParams := getListParamsFromBody(body)
listParams = append(listParams, bodyParams...)
if len(listParams) == 0 {
return statement
}
statementsParameters := zipListParams(listParams)
result := make([]interface{}, len(statementsParameters))
for i, parameters := range statementsParameters {
newStmt := copyStatement(statement)
for _, p := range parameters {
if p.paramType == valuesParamType {
setParameterOnStatement(newStmt.With.Values, p.path, p.value)
}
if p.paramType == bodyParamType {
newStmt.With.Body = p.value
}
}
result[i] = multiplex(newStmt)
}
return result
}
func getListParamsFromBody(body interface{}) []listParameters {
var result []listParameters
if body, ok := body.([]interface{}); ok {
result = append(result, listParameters{paramType: bodyParamType, value: body})
}
return result
}
func setParameterOnStatement(params interface{}, path []string, value interface{}) {
if params, ok := params.(map[string]interface{}); ok {
if len(path) == 1 {
params[path[0]] = value
return
}
field, ok := params[path[0]]
if !ok {
return
}
setParameterOnStatement(field, path[1:], value)
}
}
func getListParamsFromValues(values map[string]interface{}) []listParameters {
var result []listParameters
for key, val := range values {
lp := findListParameters([]string{key}, val)
result = append(result, lp...)
}
return result
}
func findListParameters(path []string, val interface{}) []listParameters {
switch val := val.(type) {
case domain.NoMultiplex:
return []listParameters{}
case map[string]interface{}:
var result []listParameters
for k, v := range val {
lp := findListParameters(append(path, k), v)
result = append(result, lp...)
}
return result
case []interface{}:
return []listParameters{{path: path, paramType: valuesParamType, value: val}}
default:
return []listParameters{}
}
}
func zipListParams(listParams []listParameters) [][]parameter {
statementCount := minimumListParamLength(listParams)
result := make([][]parameter, statementCount)
var i uint64
for i = 0; i < statementCount; i++ {
statementParameters := make([]parameter, len(listParams))
for j, lp := range listParams {
statementParameters[j] = parameter{path: lp.path, paramType: lp.paramType, value: lp.value[i]}
}
result[i] = statementParameters
}
return result
}
func minimumListParamLength(listParams []listParameters) uint64 {
var result uint64 = math.MaxUint64
for _, lp := range listParams {
length := uint64(len(lp.value))
if length < result {
result = length
}
}
return result
}
func copyStatement(statement domain.Statement) domain.Statement {
newStatement := statement
if statement.Headers != nil {
newStatement.Headers = make(map[string]interface{}, len(statement.Headers))
for k, v := range statement.Headers {
newStatement.Headers[k] = v
}
}
if statement.With.Values != nil {
newStatement.With.Values = make(map[string]interface{}, len(statement.With.Values))
for k, v := range statement.With.Values {
newStatement.With.Values[k] = copyValue(v)
}
}
if statement.Only != nil {
newStatement.Only = make([]interface{}, len(statement.Only))
copy(newStatement.Only, statement.Only)
}
return newStatement
}
func copyValue(value interface{}) interface{} {
switch value := value.(type) {
case map[string]interface{}:
m := make(map[string]interface{})
for k, v := range value {
m[k] = copyValue(v)
}
return m
default:
return value
}
}