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pipeline.go
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pipeline.go
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package hooks
import (
"bytes"
"fmt"
"io"
"net/http"
"go.uber.org/zap"
"github.com/wundergraph/graphql-go-tools/pkg/engine/plan"
"github.com/wundergraph/graphql-go-tools/pkg/engine/resolve"
"github.com/wundergraph/graphql-go-tools/pkg/lexer/literal"
"github.com/wundergraph/wundergraph/pkg/pool"
"github.com/wundergraph/wundergraph/pkg/postresolvetransform"
"github.com/wundergraph/wundergraph/pkg/wgpb"
)
type SubscriptionWriter interface {
http.ResponseWriter
resolve.FlushWriter
}
type QueryResolver interface {
ResolveGraphQLResponse(ctx *resolve.Context, response *resolve.GraphQLResponse, data []byte, writer io.Writer) (err error)
}
type ResolveConfiguration struct {
// Pre indicates whether the PreResolve hook should be run
Pre bool
// MutatingPre indicates whether the MutatingPreResolve hook should be run
MutatingPre bool
// Custom indicates whether the CustomResolve hook should be run
Custom bool
// Mock indicates whether the MockResolve hook should be run
Mock bool
}
type PostResolveConfiguration struct {
// Post indicates whether the PostResolve hook should be run
Post bool
// MutatingPost indicates whether the MutatingPostResolve hook should be run
MutatingPost bool
}
type Response struct {
Done bool
Resolved bool
Data []byte
}
type PipelineConfig struct {
Client *Client
Operation *wgpb.Operation
Transformer *postresolvetransform.Transformer
Logger *zap.Logger
}
type SynchronousOperationPipelineConfig struct {
PipelineConfig
Resolver QueryResolver
Plan *plan.SynchronousResponsePlan
}
type SubscriptionOperationPipelineConfig struct {
PipelineConfig
Resolver SubscriptionResolver
Plan *plan.SubscriptionResponsePlan
}
type SubscriptionResolver interface {
ResolveGraphQLSubscription(ctx *resolve.Context, subscription *resolve.GraphQLSubscription, writer resolve.FlushWriter) (err error)
}
type pipeline struct {
client *Client
logger *zap.Logger
operation *wgpb.Operation
postResolveTransformer *postresolvetransform.Transformer
ResolveConfig ResolveConfiguration
PostResolveConfig PostResolveConfiguration
}
func newPipeline(config PipelineConfig) pipeline {
hooksConfig := config.Operation.GetHooksConfiguration()
return pipeline{
client: config.Client,
logger: config.Logger,
operation: config.Operation,
postResolveTransformer: config.Transformer,
ResolveConfig: ResolveConfiguration{
Pre: hooksConfig.GetPreResolve(),
MutatingPre: hooksConfig.GetMutatingPreResolve(),
Custom: hooksConfig.GetCustomResolve(),
// TODO: Mock hook seems to support some extra configuration
Mock: hooksConfig.GetMockResolve().GetEnable(),
},
PostResolveConfig: PostResolveConfiguration{
Post: hooksConfig.GetPostResolve(),
MutatingPost: hooksConfig.GetMutatingPostResolve(),
},
}
}
func NewSynchronousOperationPipeline(config SynchronousOperationPipelineConfig) *SynchronousOperationPipeline {
return &SynchronousOperationPipeline{
pipeline: newPipeline(config.PipelineConfig),
resolver: config.Resolver,
plan: config.Plan,
}
}
func NewSubscriptionOperationPipeline(config SubscriptionOperationPipelineConfig) *SubscriptionOperationPipeline {
return &SubscriptionOperationPipeline{
pipeline: newPipeline(config.PipelineConfig),
resolver: config.Resolver,
plan: config.Plan,
}
}
func (p *pipeline) updateContextHeaders(ctx *resolve.Context, headers map[string]string) {
if len(headers) == 0 {
return
}
httpHeader := http.Header{}
for name := range headers {
httpHeader.Set(name, headers[name])
}
ctx.Request.Header = httpHeader
clientRequest := ctx.Context().Value(pool.ClientRequestKey)
if clientRequest == nil {
return
}
if cr, ok := clientRequest.(*http.Request); ok {
cr.Header = httpHeader
}
}
func (p *pipeline) handleHookResponse(ctx *resolve.Context, w http.ResponseWriter, hook MiddlewareHook, resp *MiddlewareHookResponse) (done bool) {
if resp == nil {
p.logger.Error(fmt.Sprintf("hook %s failed", hook),
zap.String("operationName", p.operation.Name),
zap.String("operationType", p.operation.OperationType.String()),
)
if w != nil {
http.Error(w, "Internal Server Error", http.StatusInternalServerError)
if flusher, ok := w.(http.Flusher); ok {
flusher.Flush()
}
}
return true
}
p.updateContextHeaders(ctx, resp.SetClientRequestHeaders)
return false
}
// PreResolve runs the pre-resolution hooks
func (p *pipeline) PreResolve(ctx *resolve.Context, w http.ResponseWriter, r *http.Request) (*Response, error) {
// XXX: Errors returned by Client.DoOperationRequest() already contain the hook name, do not reannotate them!
hookBuf := pool.GetBytesBuffer()
defer pool.PutBytesBuffer(hookBuf)
payloadBuf := pool.GetBytesBuffer()
defer pool.PutBytesBuffer(payloadBuf)
var resp *MiddlewareHookResponse
data := ctx.Variables
if p.ResolveConfig.Pre {
hookData, err := EncodeData(r, hookBuf, data, nil)
if err != nil {
return nil, err
}
resp, err = p.client.DoOperationRequest(ctx.Context(), p.operation.Name, PreResolve, hookData, payloadBuf)
if err != nil {
return nil, err
}
if done := p.handleHookResponse(ctx, w, PreResolve, resp); done {
return &Response{
Done: true,
}, nil
}
}
if p.ResolveConfig.MutatingPre {
hookData, err := EncodeData(r, hookBuf, data, nil)
if err != nil {
return nil, err
}
resp, err = p.client.DoOperationRequest(ctx.Context(), p.operation.Name, MutatingPreResolve, hookData, payloadBuf)
if err != nil {
return nil, err
}
if done := p.handleHookResponse(ctx, w, MutatingPreResolve, resp); done {
return &Response{
Done: true,
}, nil
}
// Update data with what the hook returned
// XXX: mutatingPreResolve returns the data in resp.Input
data = resp.Input
}
if p.ResolveConfig.Mock {
hookData, err := EncodeData(r, hookBuf, data, nil)
if err != nil {
return nil, err
}
resp, err := p.client.DoOperationRequest(ctx.Context(), p.operation.Name, MockResolve, hookData, payloadBuf)
if err != nil {
return nil, err
}
if done := p.handleHookResponse(ctx, w, MutatingPreResolve, resp); done {
return &Response{
Done: true,
}, nil
}
// MockResolve returned data is used unconditionally
return &Response{
Resolved: true,
Data: resp.Response,
}, nil
}
if p.ResolveConfig.Custom {
hookData, err := EncodeData(r, hookBuf, data, nil)
if err != nil {
return nil, err
}
resp, err = p.client.DoOperationRequest(ctx.Context(), p.operation.Name, CustomResolve, hookData, payloadBuf)
if err != nil {
return nil, err
}
if done := p.handleHookResponse(ctx, w, CustomResolve, resp); done {
return &Response{
Done: true,
}, nil
}
// the customResolve hook can indicate to "skip" by responding with "null"
// so, we only write the response if it's not null
// XXX: customResolve returns the data in resp.Response
if !bytes.Equal(resp.Response, literal.NULL) {
return &Response{
Resolved: true,
Data: resp.Response,
}, nil
}
}
return &Response{Data: data}, nil
}
// PostResolve runs the post-resolution hooks
func (p *pipeline) PostResolve(ctx *resolve.Context, w http.ResponseWriter, r *http.Request, responseData []byte) (*Response, error) {
// XXX: Errors returned by Client.DoOperationRequest() already contain the hook name, do not reannotate them!
hookBuf := pool.GetBytesBuffer()
defer pool.PutBytesBuffer(hookBuf)
payloadBuf := pool.GetBytesBuffer()
defer pool.PutBytesBuffer(payloadBuf)
if p.PostResolveConfig.Post {
postResolveData, err := EncodeData(r, hookBuf, ctx.Variables, responseData)
if err != nil {
return nil, err
}
resp, err := p.client.DoOperationRequest(ctx.Context(), p.operation.Name, PostResolve, postResolveData, payloadBuf)
if err != nil {
return nil, err
}
if done := p.handleHookResponse(ctx, w, CustomResolve, resp); done {
return &Response{
Done: true,
}, nil
}
}
if p.PostResolveConfig.MutatingPost {
mutatingPostData, err := EncodeData(r, hookBuf, ctx.Variables, responseData)
if err != nil {
return nil, err
}
resp, err := p.client.DoOperationRequest(ctx.Context(), p.operation.Name, MutatingPostResolve, mutatingPostData, payloadBuf)
if err != nil {
return nil, err
}
if done := p.handleHookResponse(ctx, w, CustomResolve, resp); done {
return &Response{
Done: true,
}, nil
}
responseData = resp.Response
}
return &Response{
Data: responseData,
}, nil
}
type SynchronousOperationPipeline struct {
pipeline
resolver QueryResolver
plan *plan.SynchronousResponsePlan
}
// Run runs the pre-resolution hooks, resolves the operation if needed and then runs the post-resolution
// hooks. The pipeline Resolver must implement ResolveOperation.
func (p *SynchronousOperationPipeline) Run(ctx *resolve.Context, w http.ResponseWriter, r *http.Request, buf *bytes.Buffer) (*Response, error) {
preResolveResp, err := p.PreResolve(ctx, w, r)
if err != nil {
return nil, fmt.Errorf("preResolve hooks failed: %w", err)
}
if preResolveResp.Done {
return preResolveResp, nil
}
variables := ctx.Variables
ctx.Variables = preResolveResp.Data
if preResolveResp.Resolved {
_, err = io.Copy(buf, bytes.NewReader(ctx.Variables))
} else {
err = p.resolver.ResolveGraphQLResponse(ctx, p.plan.Response, nil, buf)
}
// Restore ctx.Variables, since ctx might be reused for live queries
ctx.Variables = variables
if err != nil {
return nil, fmt.Errorf("ResolveGraphQLResponse failed: %w", err)
}
var response []byte
if p.postResolveTransformer != nil {
response, err = p.postResolveTransformer.Transform(buf.Bytes())
if err != nil {
return nil, fmt.Errorf("postResolveTransformer failed: %w", err)
}
} else {
response = buf.Bytes()
}
postResolveResp, err := p.PostResolve(ctx, w, r, response)
if err != nil {
return nil, fmt.Errorf("postResolve hooks failed: %w", err)
}
if postResolveResp.Done {
return postResolveResp, nil
}
return &Response{
Data: postResolveResp.Data,
}, nil
}
type SubscriptionOperationPipeline struct {
pipeline
resolver SubscriptionResolver
plan *plan.SubscriptionResponsePlan
}
// RunSubscription runs the pre-resolution hooks and resolves the subscription if needed. The writer is responsible for
// calling the post-resolution hooks (usually via Pipeline.PostResolve()). The pipeline Resolver must implement
// ResolveSubscription.
func (p *SubscriptionOperationPipeline) RunSubscription(ctx *resolve.Context, w SubscriptionWriter, r *http.Request) (*Response, error) {
preResolveResp, err := p.PreResolve(ctx, w, r)
if err != nil {
return nil, fmt.Errorf("preResolve hooks failed: %w", err)
}
if preResolveResp.Done {
return preResolveResp, nil
}
if preResolveResp.Resolved {
_, err = w.Write(preResolveResp.Data)
} else {
variables := ctx.Variables
ctx.Variables = preResolveResp.Data
err = p.resolver.ResolveGraphQLSubscription(ctx, p.plan.Response, w)
// Restore ctx.Variables, since ctx might be reused
ctx.Variables = variables
}
if err != nil {
return nil, fmt.Errorf("ResolveGraphQLResponse failed: %w", err)
}
return &Response{
Done: true,
}, nil
}