path: root/rpc/api/mergedapi.go

package api

import "github.com/ethereum/go-ethereum/rpc/shared"

// combines multiple API's
type mergedApi struct {
    apis []string
    methods map[string]EthereumApi
}

// create new merged api instance
func newMergedApi(apis ...EthereumApi) *mergedApi {
    mergedApi := new(mergedApi)
    mergedApi.apis = make([]string, len(apis))
    mergedApi.methods = make(map[string]EthereumApi)

    for i, api := range apis {
        mergedApi.apis[i] = api.Name()
        for _, method := range api.Methods() {
            mergedApi.methods[method] = api
        }
    }
    return mergedApi
}

// Supported RPC methods
func (self *mergedApi) Methods() []string {
    all := make([]string, len(self.methods))
    for method, _ := range self.methods {
        all = append(all, method)
    }
    return all
}

// Call the correct API's Execute method for the given request
func (self *mergedApi) Execute(req *shared.Request) (interface{}, error) {
    if res, _ := self.handle(req); res != nil {
        return res, nil
    }
    if api, found := self.methods[req.Method]; found {
        return api.Execute(req)
    }
    return nil, shared.NewNotImplementedError(req.Method)
}

func (self *mergedApi) Name() string {
    return MergedApiName
}

func (self *mergedApi) handle(req *shared.Request) (interface{}, error) {
    if req.Method == "support_apis" {   // provided API's
        return self.apis, nil
    }

    return nil, nil
}