132 lines
3.4 KiB
Go
132 lines
3.4 KiB
Go
package queryclient
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import (
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"context"
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"fmt"
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gogogrpc "github.com/cosmos/gogoproto/grpc"
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"google.golang.org/grpc"
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"google.golang.org/grpc/encoding"
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)
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var (
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_ gogogrpc.ClientConn = &QueryHelper{}
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_ gogogrpc.Server = &QueryHelper{}
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)
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// GRPCQueryHandler defines a function type which handles mocked ABCI Query requests
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// using gRPC
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type GRPCQueryHandler = func(ctx context.Context, req *QueryRequest) (*QueryResponse, error)
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// QueryRequest is a light mock of cometbft abci.QueryRequest.
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type QueryRequest struct {
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Data []byte
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Height int64
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}
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// QueryResponse is a light mock of cometbft abci.QueryResponse.
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type QueryResponse struct {
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Value []byte
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Height int64
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}
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// QueryHelper is a test utility for building a query client from a proto interface registry.
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type QueryHelper struct {
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cdc encoding.Codec
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routes map[string]GRPCQueryHandler
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}
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func NewQueryHelper(cdc encoding.Codec) *QueryHelper {
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qh := &QueryHelper{
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cdc: cdc,
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routes: map[string]GRPCQueryHandler{},
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}
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return qh
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}
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// Invoke implements the grpc ClientConn.Invoke method
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func (q *QueryHelper) Invoke(ctx context.Context, method string, args, reply interface{}, _ ...grpc.CallOption) error {
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querier := q.Route(method)
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if querier == nil {
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return fmt.Errorf("handler not found for %s", method)
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}
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reqBz, err := q.cdc.Marshal(args)
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if err != nil {
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return err
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}
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res, err := querier(ctx, &QueryRequest{Data: reqBz})
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if err != nil {
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return err
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}
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err = q.cdc.Unmarshal(res.Value, reply)
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if err != nil {
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return err
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}
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return nil
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}
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// NewStream implements the grpc ClientConn.NewStream method
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func (q *QueryHelper) NewStream(context.Context, *grpc.StreamDesc, string, ...grpc.CallOption) (grpc.ClientStream, error) {
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panic("not implemented")
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}
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// Route returns the GRPCQueryHandler for a given query route path or nil
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// if not found
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func (q *QueryHelper) Route(path string) GRPCQueryHandler {
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handler, found := q.routes[path]
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if !found {
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return nil
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}
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return handler
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}
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// RegisterService implements the gRPC Server.RegisterService method. sd is a gRPC
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// service description, handler is an object which implements that gRPC service/
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//
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// This functions PANICS:
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// - if a protobuf service is registered twice.
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func (q *QueryHelper) RegisterService(sd *grpc.ServiceDesc, handler interface{}) {
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// adds a top-level query handler based on the gRPC service name
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for _, method := range sd.Methods {
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q.registerABCIQueryHandler(sd, method, handler)
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}
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}
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func (q *QueryHelper) registerABCIQueryHandler(sd *grpc.ServiceDesc, method grpc.MethodDesc, handler interface{}) {
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fqName := fmt.Sprintf("/%s/%s", sd.ServiceName, method.MethodName)
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methodHandler := method.Handler
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_, found := q.routes[fqName]
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if found {
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panic(fmt.Sprintf("handler for %s already registered", fqName))
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}
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q.routes[fqName] = func(ctx context.Context, req *QueryRequest) (*QueryResponse, error) {
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// call the method handler from the service description with the handler object,
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// a wrapped sdk.Context with proto-unmarshaled data from the ABCI request data
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res, err := methodHandler(handler, ctx, func(i interface{}) error {
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return q.cdc.Unmarshal(req.Data, i)
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}, nil)
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if err != nil {
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return nil, err
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}
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// proto marshal the result bytes
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var resBytes []byte
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resBytes, err = q.cdc.Marshal(res)
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if err != nil {
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return nil, err
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}
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// return the result bytes as the response value
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return &QueryResponse{
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Height: req.Height,
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Value: resBytes,
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}, nil
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}
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}
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