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128 lines
3.7 KiB
128 lines
3.7 KiB
package server
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import (
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"context"
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"errors"
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"fmt"
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"net/http"
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"reflect"
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"github.com/tendermint/tendermint/libs/log"
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)
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// RegisterRPCFuncs adds a route to mux for each non-websocket function in the
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// funcMap, and also a root JSON-RPC POST handler.
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func RegisterRPCFuncs(mux *http.ServeMux, funcMap map[string]*RPCFunc, logger log.Logger) {
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for name, fn := range funcMap {
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if fn.ws {
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continue // skip websocket endpoints, not usable via GET calls
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}
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mux.HandleFunc("/"+name, makeHTTPHandler(fn, logger))
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}
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// Endpoints for POST.
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mux.HandleFunc("/", handleInvalidJSONRPCPaths(makeJSONRPCHandler(funcMap, logger)))
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}
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// Function introspection
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// RPCFunc contains the introspected type information for a function.
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type RPCFunc struct {
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f reflect.Value // underlying rpc function
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args []reflect.Type // type of each function arg
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returns []reflect.Type // type of each return arg
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argNames []string // name of each argument
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ws bool // websocket only
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}
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// NewRPCFunc constructs an RPCFunc for f, which must be a function whose type
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// signature matches one of these schemes:
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//
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// func(context.Context, T1, T2, ...) error
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// func(context.Context, T1, T2, ...) (R, error)
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//
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// for arbitrary types T_i and R. The number of argNames must exactly match the
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// number of non-context arguments to f. Otherwise, NewRPCFunc panics.
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//
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// The parameter names given are used to map JSON object keys to the
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// corresonding parameter of the function. The names do not need to match the
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// declared names, but must match what the client sends in a request.
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func NewRPCFunc(f interface{}, argNames ...string) *RPCFunc {
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rf, err := newRPCFunc(f, argNames)
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if err != nil {
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panic("invalid RPC function: " + err.Error())
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}
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return rf
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}
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// NewWSRPCFunc behaves as NewRPCFunc, but marks the resulting function for use
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// via websocket.
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func NewWSRPCFunc(f interface{}, argNames ...string) *RPCFunc {
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rf := NewRPCFunc(f, argNames...)
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rf.ws = true
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return rf
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}
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var (
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ctxType = reflect.TypeOf((*context.Context)(nil)).Elem()
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errType = reflect.TypeOf((*error)(nil)).Elem()
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)
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// newRPCFunc constructs an RPCFunc for f. See the comment at NewRPCFunc.
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func newRPCFunc(f interface{}, argNames []string) (*RPCFunc, error) {
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if f == nil {
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return nil, errors.New("nil function")
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}
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// Check the type and signature of f.
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fv := reflect.ValueOf(f)
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if fv.Kind() != reflect.Func {
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return nil, errors.New("not a function")
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}
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ft := fv.Type()
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if np := ft.NumIn(); np == 0 {
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return nil, errors.New("wrong number of parameters")
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} else if ft.In(0) != ctxType {
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return nil, errors.New("first parameter is not context.Context")
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} else if np-1 != len(argNames) {
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return nil, fmt.Errorf("have %d names for %d parameters", len(argNames), np-1)
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}
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if no := ft.NumOut(); no < 1 || no > 2 {
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return nil, errors.New("wrong number of results")
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} else if ft.Out(no-1) != errType {
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return nil, errors.New("last result is not error")
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}
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args := make([]reflect.Type, ft.NumIn())
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for i := 0; i < ft.NumIn(); i++ {
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args[i] = ft.In(i)
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}
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outs := make([]reflect.Type, ft.NumOut())
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for i := 0; i < ft.NumOut(); i++ {
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outs[i] = ft.Out(i)
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}
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return &RPCFunc{
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f: fv,
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args: args,
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returns: outs,
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argNames: argNames,
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}, nil
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}
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//-------------------------------------------------------------
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// NOTE: assume returns is result struct and error. If error is not nil, return it
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func unreflectResult(returns []reflect.Value) (interface{}, error) {
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errV := returns[1]
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if err, ok := errV.Interface().(error); ok && err != nil {
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return nil, err
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}
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rv := returns[0]
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// the result is a registered interface,
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// we need a pointer to it so we can marshal with type byte
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rvp := reflect.New(rv.Type())
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rvp.Elem().Set(rv)
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return rvp.Interface(), nil
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}
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