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persisted_operation.go
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/
persisted_operation.go
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package cdn
import (
"compress/gzip"
"context"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"github.com/buger/jsonparser"
"github.com/dgraph-io/ristretto"
"github.com/wundergraph/cosmo/router/internal/jwt"
"github.com/wundergraph/cosmo/router/internal/unsafebytes"
"go.uber.org/zap"
)
const (
PersistedOperationNotFoundErrorCode = "PersistedQueryNotFound"
persistentAverageCacheEntrySize = 4 * 1024 // 4kb
)
var (
persistedOperationKeys = [][]string{
{"version"},
{"body"},
}
)
const (
persistedOperationKeyIndexVersion = iota
persistedOperationKeyIndexBody
)
type PersistentOperationNotFoundError interface {
error
ClientName() string
Sha256Hash() string
}
type persistentOperationNotFoundError struct {
clientName string
sha256Hash string
}
func (e *persistentOperationNotFoundError) ClientName() string {
return e.clientName
}
func (e *persistentOperationNotFoundError) Sha256Hash() string {
return string(e.sha256Hash)
}
func (e *persistentOperationNotFoundError) Error() string {
return fmt.Sprintf("operation %s for client %s not found", e.sha256Hash, e.clientName)
}
type cdnPersistedOperationsCache struct {
// cache is the backing store for the in-memory cache. Note
// that if the cache is disabled, this will be nil
cache *ristretto.Cache
}
func (c *cdnPersistedOperationsCache) key(clientName string, operationHash []byte) string {
return clientName + unsafebytes.BytesToString(operationHash)
}
func (c *cdnPersistedOperationsCache) Get(clientName string, operationHash string) []byte {
// Since we're returning nil when the item is not found, we don't need to
// check the return value from the cache nor the type assertion
item, _ := c.cache.Get(c.key(clientName, unsafebytes.StringToBytes(operationHash)))
data, _ := item.([]byte)
return data
}
func (c *cdnPersistedOperationsCache) Set(clientName, operationHash string, operationBody []byte) {
c.cache.Set(c.key(clientName, unsafebytes.StringToBytes(operationHash)), operationBody, int64(len(operationBody)))
}
type PersistentOperationsOptions struct {
// CacheSize indicates the in-memory cache size, in bytes. If 0, no in-memory
// cache is used.
CacheSize uint64
Logger *zap.Logger
}
type PersistentOperationClient struct {
cdnURL *url.URL
authenticationToken string
// federatedGraphID is the ID of the federated graph that was obtained
// from the token, already url-escaped
federatedGraphID string
// organizationID is the ID of the organization for this graph that was obtained
// from the token, already url-escaped
organizationID string
httpClient *http.Client
operationsCache *cdnPersistedOperationsCache
logger *zap.Logger
}
func (cdn *PersistentOperationClient) PersistedOperation(ctx context.Context, clientName string, sha256Hash string) ([]byte, error) {
if data := cdn.operationsCache.Get(clientName, sha256Hash); data != nil {
return data, nil
}
operationPath := fmt.Sprintf("/%s/%s/operations/%s/%s.json",
cdn.organizationID,
cdn.federatedGraphID,
url.PathEscape(clientName),
url.PathEscape(sha256Hash))
operationURL := cdn.cdnURL.ResolveReference(&url.URL{Path: operationPath})
req, err := http.NewRequestWithContext(ctx, "GET", operationURL.String(), nil)
if err != nil {
return nil, err
}
req.Header.Set("Content-Type", "application/json; charset=UTF-8")
req.Header.Add("Authorization", "Bearer "+cdn.authenticationToken)
req.Header.Set("Accept-Encoding", "gzip")
resp, err := cdn.httpClient.Do(req)
if err != nil {
return nil, err
}
defer resp.Body.Close()
if resp.StatusCode != http.StatusOK {
if resp.StatusCode == http.StatusNotFound {
return nil, &persistentOperationNotFoundError{
clientName: clientName,
sha256Hash: sha256Hash,
}
}
if resp.StatusCode == http.StatusUnauthorized {
return nil, errors.New("could not authenticate against CDN")
}
if resp.StatusCode == http.StatusBadRequest {
return nil, errors.New("bad request")
}
return nil, fmt.Errorf("unexpected status code when loading persisted operation, statusCode: %d", resp.StatusCode)
}
var reader io.Reader = resp.Body
if resp.Header.Get("Content-Encoding") == "gzip" {
r, err := gzip.NewReader(resp.Body)
if err != nil {
return nil, errors.New("could not create gzip reader. " + err.Error())
}
defer r.Close()
reader = r
}
body, err := io.ReadAll(reader)
if err != nil {
return nil, errors.New("could not read the response body. " + err.Error())
}
var (
operationVersion []byte
operationBody []byte
)
jsonparser.EachKey(body, func(idx int, value []byte, vt jsonparser.ValueType, err error) {
switch idx {
case persistedOperationKeyIndexVersion:
operationVersion = value
case persistedOperationKeyIndexBody:
operationBody = value
}
}, persistedOperationKeys...)
if len(operationVersion) != 1 || operationVersion[0] != '1' {
return nil, fmt.Errorf("invalid persisted operation version %q", string(operationVersion))
}
unescaped, err := jsonparser.Unescape(operationBody, nil)
if err != nil {
return nil, fmt.Errorf("error unescaping persisted operation body: %w", err)
}
cdn.operationsCache.Set(clientName, sha256Hash, unescaped)
return unescaped, nil
}
// NewPersistentOperationClient creates a new CDN client. URL is the URL of the CDN.
// Token is the token used to authenticate with the CDN, the same as the GRAPH_API_TOKEN
func NewPersistentOperationClient(endpoint string, token string, opts PersistentOperationsOptions) (*PersistentOperationClient, error) {
u, err := url.Parse(endpoint)
if err != nil {
return nil, fmt.Errorf("invalid CDN URL %q: %w", endpoint, err)
}
if opts.Logger == nil {
opts.Logger = zap.NewNop()
}
claims, err := jwt.ExtractFederatedGraphTokenClaims(token)
if err != nil {
return nil, err
}
cacheSize := int64(opts.CacheSize)
var cache *ristretto.Cache
if cacheSize > 0 {
cache, err = ristretto.NewCache(&ristretto.Config{
// assume an average of persistentAverageCacheEntrySize per operation, then
// multiply by 10 to obtain the recommended number of counters
NumCounters: (cacheSize * 10) / persistentAverageCacheEntrySize,
MaxCost: cacheSize,
BufferItems: 64,
})
if err != nil {
return nil, fmt.Errorf("initializing CDN cache: %v", err)
}
}
return &PersistentOperationClient{
cdnURL: u,
authenticationToken: token,
federatedGraphID: url.PathEscape(claims.FederatedGraphID),
organizationID: url.PathEscape(claims.OrganizationID),
httpClient: newRetryableHTTPClient(opts.Logger),
logger: opts.Logger,
operationsCache: &cdnPersistedOperationsCache{
cache: cache,
},
}, nil
}