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response.go
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response.go
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package runner
import (
"bytes"
"github.com/b2wdigital/restQL-golang/v6/pkg/restql"
"strconv"
"strings"
"github.com/b2wdigital/restQL-golang/v6/internal/domain"
)
// DoneResourceOptions represents information
// from the statement that should be passed
// to the result.
type DoneResourceOptions struct {
Debugging bool
IgnoreErrors bool
MaxAge interface{}
SMaxAge interface{}
}
// NewDoneResource constructs a DoneResourceOptions value.
func NewDoneResource(request restql.HTTPRequest, response restql.HTTPResponse, options DoneResourceOptions) restql.DoneResource {
dr := restql.DoneResource{
Status: response.StatusCode,
Success: response.StatusCode >= 200 && response.StatusCode < 400,
IgnoreErrors: options.IgnoreErrors,
CacheControl: makeCacheControl(response, options),
Method: request.Method,
URL: response.URL,
RequestParams: request.Query,
RequestBody: request.Body,
RequestHeaders: request.Headers,
ResponseHeaders: response.Headers,
ResponseBody: response.Body,
ResponseTime: response.Duration.Milliseconds(),
}
return dr
}
// NewErrorResponse builds a DoneResource value for a failed HTTP call.
func NewErrorResponse(log restql.Logger, err error, request restql.HTTPRequest, response restql.HTTPResponse, options DoneResourceOptions) restql.DoneResource {
rb := restql.NewResponseBodyFromValue(log, err.Error())
return restql.DoneResource{
Status: response.StatusCode,
Success: false,
IgnoreErrors: options.IgnoreErrors,
ResponseBody: rb,
Method: request.Method,
URL: response.URL,
RequestParams: request.Query,
RequestBody: request.Body,
RequestHeaders: request.Headers,
ResponseHeaders: response.Headers,
ResponseTime: response.Duration.Milliseconds(),
}
}
// NewEmptyChainedResponse builds a DoneResource for a statement
// with unresolved chain parameters.
func NewEmptyChainedResponse(log restql.Logger, params []string, options DoneResourceOptions) restql.DoneResource {
var buf bytes.Buffer
buf.WriteString("The request was skipped due to missing { ")
for _, p := range params {
buf.WriteString(":")
buf.WriteString(p)
buf.WriteString(" ")
}
buf.WriteString("} param value")
rb := restql.NewResponseBodyFromValue(log, buf.String())
return restql.DoneResource{
Status: 400,
Success: false,
IgnoreErrors: options.IgnoreErrors,
ResponseBody: rb,
}
}
// GetEmptyChainedParams returns the chain parameters that
// could not be resolved.
func GetEmptyChainedParams(statement domain.Statement) []string {
var r []string
for key, value := range statement.With.Values {
if isEmptyChained(value) {
r = append(r, key)
}
}
return r
}
func isEmptyChained(value interface{}) bool {
switch value := value.(type) {
case map[string]interface{}:
for _, v := range value {
if isEmptyChained(v) {
return true
}
}
return false
case []interface{}:
for _, v := range value {
if isEmptyChained(v) {
return true
}
}
return false
default:
return value == EmptyChained
}
}
func NewNewDependsOnUnresolvedResponse(log restql.Logger, stmt domain.Statement, options DoneResourceOptions) restql.DoneResource {
var buf bytes.Buffer
buf.WriteString("The request was skipped due to unresolved dependency { ")
buf.WriteString(stmt.DependsOn.Target)
buf.WriteString(" }")
rb := restql.NewResponseBodyFromValue(log, buf.String())
return restql.DoneResource{
Status: 400,
Success: false,
IgnoreErrors: options.IgnoreErrors,
ResponseBody: rb,
}
}
func makeCacheControl(response restql.HTTPResponse, options DoneResourceOptions) restql.ResourceCacheControl {
headerCacheControl, headerFound := getCacheControlOptionsFromHeader(response)
defaultCacheControl, defaultFound := getDefaultCacheControlOptions(options)
if !headerFound && !defaultFound {
return restql.ResourceCacheControl{}
}
switch {
case !headerFound && !defaultFound:
return restql.ResourceCacheControl{}
case !headerFound:
return defaultCacheControl
case !defaultFound:
return headerCacheControl
default:
return bestCacheControl(headerCacheControl, defaultCacheControl)
}
}
func bestCacheControl(first restql.ResourceCacheControl, second restql.ResourceCacheControl) restql.ResourceCacheControl {
result := restql.ResourceCacheControl{}
if first.NoCache || second.NoCache {
result.NoCache = true
return result
}
result.MaxAge = bestCacheControlValue(first.MaxAge, second.MaxAge)
result.SMaxAge = bestCacheControlValue(first.SMaxAge, second.SMaxAge)
return result
}
func bestCacheControlValue(first restql.ResourceCacheControlValue, second restql.ResourceCacheControlValue) restql.ResourceCacheControlValue {
switch {
case !first.Exist && !second.Exist:
return restql.ResourceCacheControlValue{Exist: false}
case !first.Exist:
return second
case !second.Exist:
return first
default:
time := min(first.Time, second.Time)
return restql.ResourceCacheControlValue{Exist: true, Time: time}
}
}
func min(a int, b int) int {
if a < b {
return a
}
return b
}
func getDefaultCacheControlOptions(options DoneResourceOptions) (cc restql.ResourceCacheControl, found bool) {
maxAge, ok := options.MaxAge.(int)
if ok {
found = true
cc.MaxAge = restql.ResourceCacheControlValue{Exist: true, Time: maxAge}
}
smaxAge, ok := options.SMaxAge.(int)
if ok {
found = true
cc.SMaxAge = restql.ResourceCacheControlValue{Exist: true, Time: smaxAge}
}
return cc, found
}
func isComma(r rune) bool {
return r == ','
}
func findCacheControlHeader(response restql.HTTPResponse) (string, bool) {
for k, v := range response.Headers {
if strings.EqualFold(k, "Cache-Control") {
return v, true
}
}
return "", false
}
func getCacheControlOptionsFromHeader(response restql.HTTPResponse) (cc restql.ResourceCacheControl, found bool) {
cacheControl, ok := findCacheControlHeader(response)
if !ok {
return restql.ResourceCacheControl{}, false
}
cacheControlFields := strings.FieldsFunc(cacheControl, isComma)
for _, ccField := range cacheControlFields {
ccField = strings.TrimSpace(ccField)
if strings.EqualFold(ccField, "no-cache") {
return restql.ResourceCacheControl{NoCache: true}, true
}
keyValue := strings.Split(ccField, "=")
if len(keyValue) < 2 {
continue
}
key, value := keyValue[0], keyValue[1]
if strings.EqualFold(key, "max-age") {
timeValue, err := strconv.Atoi(value)
if err != nil {
continue
}
found = true
cc.MaxAge = restql.ResourceCacheControlValue{Exist: true, Time: timeValue}
}
if strings.EqualFold(key, "s-maxage") {
timeValue, err := strconv.Atoi(value)
if err != nil {
continue
}
found = true
cc.SMaxAge = restql.ResourceCacheControlValue{Exist: true, Time: timeValue}
}
}
return cc, found
}