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rpc: migrated the RPC insterface to a new reflection based RPC layer

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This commit is contained in:
Bas van Kervel
2015-12-16 10:58:01 +01:00
committed by Jeffrey Wilcke
parent f2ab351e8d
commit 19b2640e89
132 changed files with 4711 additions and 14320 deletions
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74
cmd/utils/api.go
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@ -1,74 +0,0 @@
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package utils
import (
"fmt"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/p2p"
rpc "github.com/ethereum/go-ethereum/rpc/v2"
)
// PublicWeb3API offers helper utils
type PublicWeb3API struct {
stack *node.Node
}
// NewPublicWeb3API creates a new Web3Service instance
func NewPublicWeb3API(stack *node.Node) *PublicWeb3API {
return &PublicWeb3API{stack}
}
// ClientVersion returns the node name
func (s *PublicWeb3API) ClientVersion() string {
return s.stack.Server().Name
}
// Sha3 applies the ethereum sha3 implementation on the input.
// It assumes the input is hex encoded.
func (s *PublicWeb3API) Sha3(input string) string {
return common.ToHex(crypto.Sha3(common.FromHex(input)))
}
// PublicNetAPI offers network related RPC methods
type PublicNetAPI struct {
net *p2p.Server
networkVersion int
}
// NewPublicNetAPI creates a new net api instance.
func NewPublicNetAPI(net *p2p.Server, networkVersion int) *PublicNetAPI {
return &PublicNetAPI{net, networkVersion}
}
// Listening returns an indication if the node is listening for network connections.
func (s *PublicNetAPI) Listening() bool {
return true // always listening
}
// Peercount returns the number of connected peers
func (s *PublicNetAPI) PeerCount() *rpc.HexNumber {
return rpc.NewHexNumber(s.net.PeerCount())
}
// ProtocolVersion returns the current ethereum protocol version.
func (s *PublicNetAPI) Version() string {
return fmt.Sprintf("%d", s.networkVersion)
}

176
cmd/utils/client.go Normal file
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@ -0,0 +1,176 @@
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package utils
import (
"encoding/json"
"fmt"
"strings"
"github.com/codegangsta/cli"
"github.com/ethereum/go-ethereum/eth"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/ethereum/go-ethereum/node"
"github.com/ethereum/go-ethereum/rpc"
)
// NewInProcRPCClient will start a new RPC server for the given node and returns a client to interact with it.
func NewInProcRPCClient(stack *node.Node) *inProcClient {
server := rpc.NewServer()
offered := stack.APIs()
for _, api := range offered {
server.RegisterName(api.Namespace, api.Service)
}
web3 := node.NewPublicWeb3API(stack)
server.RegisterName("web3", web3)
var ethereum *eth.Ethereum
if err := stack.Service(&ethereum); err == nil {
net := eth.NewPublicNetAPI(stack.Server(), ethereum.NetVersion())
server.RegisterName("net", net)
} else {
glog.V(logger.Warn).Infof("%v\n", err)
}
buf := &buf{
requests: make(chan []byte),
responses: make(chan []byte),
}
client := &inProcClient{
server: server,
buf: buf,
}
go func() {
server.ServeCodec(rpc.NewJSONCodec(client.buf))
}()
return client
}
// buf represents the connection between the RPC server and console
type buf struct {
readBuf []byte // store remaining request bytes after a partial read
requests chan []byte // list with raw serialized requests
responses chan []byte // list with raw serialized responses
}
// will read the next request in json format
func (b *buf) Read(p []byte) (int, error) {
// last read didn't read entire request, return remaining bytes
if len(b.readBuf) > 0 {
n := copy(p, b.readBuf)
if n < len(b.readBuf) {
b.readBuf = b.readBuf[:n]
} else {
b.readBuf = b.readBuf[:0]
}
return n, nil
}
// read next request
req := <-b.requests
n := copy(p, req)
if n < len(req) {
// buf too small, store remaining chunk for next read
b.readBuf = req[n:]
}
return n, nil
}
// Write send the given buffer to the backend
func (b *buf) Write(p []byte) (n int, err error) {
b.responses <- p
return len(p), nil
}
// Close cleans up obtained resources.
func (b *buf) Close() error {
close(b.requests)
close(b.responses)
return nil
}
// inProcClient starts a RPC server and uses buf to communicate with it.
type inProcClient struct {
server *rpc.Server
buf *buf
}
// Close will stop the RPC server
func (c *inProcClient) Close() {
c.server.Stop()
}
// Send a msg to the endpoint
func (c *inProcClient) Send(msg interface{}) error {
d, err := json.Marshal(msg)
if err != nil {
return err
}
c.buf.requests <- d
return nil
}
// Recv reads a message and tries to parse it into the given msg
func (c *inProcClient) Recv(msg interface{}) error {
data := <-c.buf.responses
return json.Unmarshal(data, &msg)
}
// Returns the collection of modules the RPC server offers.
func (c *inProcClient) SupportedModules() (map[string]string, error) {
return rpc.SupportedModules(c)
}
// NewRemoteRPCClient returns a RPC client which connects to a running geth instance.
// Depending on the given context this can either be a IPC or a HTTP client.
func NewRemoteRPCClient(ctx *cli.Context) (rpc.Client, error) {
if ctx.Args().Present() {
endpoint := ctx.Args().First()
return NewRemoteRPCClientFromString(endpoint)
}
// use IPC by default
endpoint := IPCSocketPath(ctx)
return rpc.NewIPCClient(endpoint)
}
// NewRemoteRPCClientFromString returns a RPC client which connects to the given
// endpoint. It must start with either `ipc:` or `rpc:` (HTTP).
func NewRemoteRPCClientFromString(endpoint string) (rpc.Client, error) {
if strings.HasPrefix(endpoint, "ipc:") {
return rpc.NewIPCClient(endpoint[4:])
}
if strings.HasPrefix(endpoint, "rpc:") {
return rpc.NewHTTPClient(endpoint[4:])
}
if strings.HasPrefix(endpoint, "http://") {
return rpc.NewHTTPClient(endpoint)
}
if strings.HasPrefix(endpoint, "ws:") {
return rpc.NewWSClient(endpoint)
}
return nil, fmt.Errorf("invalid endpoint")
}

157
cmd/utils/flags.go
View File

@ -23,7 +23,6 @@ import (
"log"
"math"
"math/big"
"net"
"net/http"
"os"
"path/filepath"
@ -31,6 +30,8 @@ import (
"strconv"
"strings"
"errors"
"github.com/codegangsta/cli"
"github.com/ethereum/ethash"
"github.com/ethereum/go-ethereum/accounts"
@ -49,14 +50,8 @@ import (
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/nat"
"github.com/ethereum/go-ethereum/params"
"github.com/ethereum/go-ethereum/rpc/api"
"github.com/ethereum/go-ethereum/rpc/codec"
"github.com/ethereum/go-ethereum/rpc/comms"
"github.com/ethereum/go-ethereum/rpc/shared"
"github.com/ethereum/go-ethereum/rpc/useragent"
rpc "github.com/ethereum/go-ethereum/rpc/v2"
"github.com/ethereum/go-ethereum/rpc"
"github.com/ethereum/go-ethereum/whisper"
"github.com/ethereum/go-ethereum/xeth"
)
func init() {
@ -282,10 +277,10 @@ var (
Usage: "Domains from which to accept cross origin requests (browser enforced)",
Value: "",
}
RpcApiFlag = cli.StringFlag{
RPCApiFlag = cli.StringFlag{
Name: "rpcapi",
Usage: "API's offered over the HTTP-RPC interface",
Value: comms.DefaultHttpRpcApis,
Value: rpc.DefaultHttpRpcApis,
}
IPCDisabledFlag = cli.BoolFlag{
Name: "ipcdisable",
@ -294,16 +289,36 @@ var (
IPCApiFlag = cli.StringFlag{
Name: "ipcapi",
Usage: "API's offered over the IPC-RPC interface",
Value: comms.DefaultIpcApis,
Value: rpc.DefaultIpcApis,
}
IPCPathFlag = DirectoryFlag{
Name: "ipcpath",
Usage: "Filename for IPC socket/pipe",
Value: DirectoryString{common.DefaultIpcPath()},
}
IPCExperimental = cli.BoolFlag{
Name: "ipcexp",
Usage: "Enable the new RPC implementation",
WSEnabledFlag = cli.BoolFlag{
Name: "ws",
Usage: "Enable the WS-RPC server",
}
WSListenAddrFlag = cli.StringFlag{
Name: "wsaddr",
Usage: "WS-RPC server listening interface",
Value: "127.0.0.1",
}
WSPortFlag = cli.IntFlag{
Name: "wsport",
Usage: "WS-RPC server listening port",
Value: 8546,
}
WSApiFlag = cli.StringFlag{
Name: "wsapi",
Usage: "API's offered over the WS-RPC interface",
Value: rpc.DefaultHttpRpcApis,
}
WSAllowedDomainsFlag = cli.StringFlag{
Name: "wsdomains",
Usage: "Domains from which to accept websockets requests",
Value: "",
}
ExecFlag = cli.StringFlag{
Name: "exec",
@ -760,7 +775,7 @@ func MakeChain(ctx *cli.Context) (chain *core.BlockChain, chainDb ethdb.Database
return chain, chainDb
}
func IpcSocketPath(ctx *cli.Context) (ipcpath string) {
func IPCSocketPath(ctx *cli.Context) (ipcpath string) {
if runtime.GOOS == "windows" {
ipcpath = common.DefaultIpcPath()
if ctx.GlobalIsSet(IPCPathFlag.Name) {
@ -780,79 +795,83 @@ func IpcSocketPath(ctx *cli.Context) (ipcpath string) {
}
func StartIPC(stack *node.Node, ctx *cli.Context) error {
config := comms.IpcConfig{
Endpoint: IpcSocketPath(ctx),
}
var ethereum *eth.Ethereum
if err := stack.Service(&ethereum); err != nil {
return err
}
if ctx.GlobalIsSet(IPCExperimental.Name) {
listener, err := comms.CreateListener(config)
if err != nil {
return err
}
endpoint := IPCSocketPath(ctx)
listener, err := rpc.CreateIPCListener(endpoint)
if err != nil {
return err
}
server := rpc.NewServer()
server := rpc.NewServer()
// register package API's this node provides
offered := stack.APIs()
for _, api := range offered {
server.RegisterName(api.Namespace, api.Service)
glog.V(logger.Debug).Infof("Register %T under namespace '%s' for IPC service\n", api.Service, api.Namespace)
}
// register package API's this node provides
offered := stack.APIs()
for _, api := range offered {
server.RegisterName(api.Namespace, api.Service)
glog.V(logger.Debug).Infof("Register %T under namespace '%s' for IPC service\n", api.Service, api.Namespace)
}
web3 := NewPublicWeb3API(stack)
server.RegisterName("web3", web3)
net := NewPublicNetAPI(stack.Server(), ethereum.NetVersion())
server.RegisterName("net", net)
go func() {
glog.V(logger.Info).Infof("Start IPC server on %s\n", config.Endpoint)
for {
conn, err := listener.Accept()
if err != nil {
glog.V(logger.Error).Infof("Unable to accept connection - %v\n", err)
}
codec := rpc.NewJSONCodec(conn)
go server.ServeCodec(codec)
go func() {
glog.V(logger.Info).Infof("Start IPC server on %s\n", endpoint)
for {
conn, err := listener.Accept()
if err != nil {
glog.V(logger.Error).Infof("Unable to accept connection - %v\n", err)
}
}()
return nil
}
initializer := func(conn net.Conn) (comms.Stopper, shared.EthereumApi, error) {
fe := useragent.NewRemoteFrontend(conn, ethereum.AccountManager())
xeth := xeth.New(stack, fe)
apis, err := api.ParseApiString(ctx.GlobalString(IPCApiFlag.Name), codec.JSON, xeth, stack)
if err != nil {
return nil, nil, err
codec := rpc.NewJSONCodec(conn)
go server.ServeCodec(codec)
}
return xeth, api.Merge(apis...), nil
}
return comms.StartIpc(config, codec.JSON, initializer)
}()
return nil
}
// StartRPC starts a HTTP JSON-RPC API server.
func StartRPC(stack *node.Node, ctx *cli.Context) error {
config := comms.HttpConfig{
ListenAddress: ctx.GlobalString(RPCListenAddrFlag.Name),
ListenPort: uint(ctx.GlobalInt(RPCPortFlag.Name)),
CorsDomain: ctx.GlobalString(RPCCORSDomainFlag.Name),
for _, api := range stack.APIs() {
if adminApi, ok := api.Service.(*node.PrivateAdminAPI); ok {
address := ctx.GlobalString(RPCListenAddrFlag.Name)
port := ctx.GlobalInt(RPCPortFlag.Name)
cors := ctx.GlobalString(RPCCORSDomainFlag.Name)
apiStr := ""
if ctx.GlobalIsSet(RPCApiFlag.Name) {
apiStr = ctx.GlobalString(RPCApiFlag.Name)
}
_, err := adminApi.StartRPC(address, port, cors, apiStr)
return err
}
}
xeth := xeth.New(stack, nil)
codec := codec.JSON
glog.V(logger.Error).Infof("Unable to start RPC-HTTP interface, could not find admin API")
return errors.New("Unable to start RPC-HTTP interface")
}
apis, err := api.ParseApiString(ctx.GlobalString(RpcApiFlag.Name), codec, xeth, stack)
if err != nil {
return err
// StartWS starts a websocket JSON-RPC API server.
func StartWS(stack *node.Node, ctx *cli.Context) error {
for _, api := range stack.APIs() {
if adminApi, ok := api.Service.(*node.PrivateAdminAPI); ok {
address := ctx.GlobalString(WSListenAddrFlag.Name)
port := ctx.GlobalInt(WSAllowedDomainsFlag.Name)
allowedDomains := ctx.GlobalString(WSAllowedDomainsFlag.Name)
apiStr := ""
if ctx.GlobalIsSet(WSApiFlag.Name) {
apiStr = ctx.GlobalString(WSApiFlag.Name)
}
_, err := adminApi.StartWS(address, port, allowedDomains, apiStr)
return err
}
}
return comms.StartHttp(config, codec, api.Merge(apis...))
glog.V(logger.Error).Infof("Unable to start RPC-WS interface, could not find admin API")
return errors.New("Unable to start RPC-WS interface")
}
func StartPProf(ctx *cli.Context) {

323
cmd/utils/jeth.go Normal file
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@ -0,0 +1,323 @@
// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
package utils
import (
"encoding/json"
"fmt"
"time"
"github.com/ethereum/go-ethereum/jsre"
"github.com/ethereum/go-ethereum/rpc"
"github.com/robertkrimen/otto"
)
type Jeth struct {
re *jsre.JSRE
client rpc.Client
}
// NewJeth create a new backend for the JSRE console
func NewJeth(re *jsre.JSRE, client rpc.Client) *Jeth {
return &Jeth{re, client}
}
func (self *Jeth) err(call otto.FunctionCall, code int, msg string, id *int64) (response otto.Value) {
m := rpc.JSONErrResponse{
Version: "2.0",
Id: id,
Error: rpc.JSONError{
Code: code,
Message: msg,
},
}
errObj, _ := json.Marshal(m.Error)
errRes, _ := json.Marshal(m)
call.Otto.Run("ret_error = " + string(errObj))
res, _ := call.Otto.Run("ret_response = " + string(errRes))
return res
}
// UnlockAccount asks the user for the password and than executes the jeth.UnlockAccount callback in the jsre
func (self *Jeth) UnlockAccount(call otto.FunctionCall) (response otto.Value) {
var cmd, account, passwd string
timeout := int64(300)
var ok bool
if len(call.ArgumentList) == 0 {
fmt.Println("expected address of account to unlock")
return otto.FalseValue()
}
if len(call.ArgumentList) >= 1 {
if accountExport, err := call.Argument(0).Export(); err == nil {
if account, ok = accountExport.(string); ok {
if len(call.ArgumentList) == 1 {
fmt.Printf("Unlock account %s\n", account)
passwd, err = PromptPassword("Passphrase: ", true)
if err != nil {
return otto.FalseValue()
}
}
}
}
}
if len(call.ArgumentList) >= 2 {
if passwdExport, err := call.Argument(1).Export(); err == nil {
passwd, _ = passwdExport.(string)
}
}
if len(call.ArgumentList) >= 3 {
if timeoutExport, err := call.Argument(2).Export(); err == nil {
timeout, _ = timeoutExport.(int64)
}
}
cmd = fmt.Sprintf("jeth.unlockAccount('%s', '%s', %d)", account, passwd, timeout)
if val, err := call.Otto.Run(cmd); err == nil {
return val
}
return otto.FalseValue()
}
// NewAccount asks the user for the password and than executes the jeth.newAccount callback in the jsre
func (self *Jeth) NewAccount(call otto.FunctionCall) (response otto.Value) {
if len(call.ArgumentList) == 0 {
passwd, err := PromptPassword("Passphrase: ", true)
if err != nil {
return otto.FalseValue()
}
passwd2, err := PromptPassword("Repeat passphrase: ", true)
if err != nil {
return otto.FalseValue()
}
if passwd != passwd2 {
fmt.Println("Passphrases don't match")
return otto.FalseValue()
}
cmd := fmt.Sprintf("jeth.newAccount('%s')", passwd)
if val, err := call.Otto.Run(cmd); err == nil {
return val
}
} else {
fmt.Println("New account doesn't expect argument(s), you will be prompted for a password")
}
return otto.FalseValue()
}
func (self *Jeth) Send(call otto.FunctionCall) (response otto.Value) {
reqif, err := call.Argument(0).Export()
if err != nil {
return self.err(call, -32700, err.Error(), nil)
}
jsonreq, err := json.Marshal(reqif)
var reqs []rpc.JSONRequest
batch := true
err = json.Unmarshal(jsonreq, &reqs)
if err != nil {
reqs = make([]rpc.JSONRequest, 1)
err = json.Unmarshal(jsonreq, &reqs[0])
batch = false
}
call.Otto.Set("response_len", len(reqs))
call.Otto.Run("var ret_response = new Array(response_len);")
for i, req := range reqs {
err := self.client.Send(&req)
if err != nil {
return self.err(call, -32603, err.Error(), req.Id)
}
result := make(map[string]interface{})
err = self.client.Recv(&result)
if err != nil {
return self.err(call, -32603, err.Error(), req.Id)
}
_, isSuccessResponse := result["result"]
_, isErrorResponse := result["error"]
if !isSuccessResponse && !isErrorResponse {
return self.err(call, -32603, fmt.Sprintf("Invalid response"), new(int64))
}
id, _ := result["id"]
call.Otto.Set("ret_id", id)
jsonver, _ := result["jsonrpc"]
call.Otto.Set("ret_jsonrpc", jsonver)
var payload []byte
if isSuccessResponse {
payload, _ = json.Marshal(result["result"])
} else if isErrorResponse {
payload, _ = json.Marshal(result["error"])
}
call.Otto.Set("ret_result", string(payload))
call.Otto.Set("response_idx", i)
response, err = call.Otto.Run(`
ret_response[response_idx] = { jsonrpc: ret_jsonrpc, id: ret_id, result: JSON.parse(ret_result) };
`)
}
if !batch {
call.Otto.Run("ret_response = ret_response[0];")
}
if call.Argument(1).IsObject() {
call.Otto.Set("callback", call.Argument(1))
call.Otto.Run(`
if (Object.prototype.toString.call(callback) == '[object Function]') {
callback(null, ret_response);
}
`)
}
return
}
/*
// handleRequest will handle user agent requests by interacting with the user and sending
// the user response back to the geth service
func (self *Jeth) handleRequest(req *shared.Request) bool {
var err error
var args []interface{}
if err = json.Unmarshal(req.Params, &args); err != nil {
glog.V(logger.Info).Infof("Unable to parse agent request - %v\n", err)
return false
}
switch req.Method {
case useragent.AskPasswordMethod:
return self.askPassword(req.Id, req.Jsonrpc, args)
case useragent.ConfirmTransactionMethod:
return self.confirmTransaction(req.Id, req.Jsonrpc, args)
}
return false
}
// askPassword will ask the user to supply the password for a given account
func (self *Jeth) askPassword(id interface{}, jsonrpc string, args []interface{}) bool {
var err error
var passwd string
if len(args) >= 1 {
if account, ok := args[0].(string); ok {
fmt.Printf("Unlock account %s\n", account)
} else {
return false
}
}
passwd, err = PromptPassword("Passphrase: ", true)
if err = self.client.Send(shared.NewRpcResponse(id, jsonrpc, passwd, err)); err != nil {
glog.V(logger.Info).Infof("Unable to send user agent ask password response - %v\n", err)
}
return err == nil
}
func (self *Jeth) confirmTransaction(id interface{}, jsonrpc string, args []interface{}) bool {
// Accept all tx which are send from this console
return self.client.Send(shared.NewRpcResponse(id, jsonrpc, true, nil)) == nil
}
*/
// throwJSExeception panics on an otto value, the Otto VM will then throw msg as a javascript error.
func throwJSExeception(msg interface{}) otto.Value {
p, _ := otto.ToValue(msg)
panic(p)
return p
}
// Sleep will halt the console for arg[0] seconds.
func (self *Jeth) Sleep(call otto.FunctionCall) (response otto.Value) {
if len(call.ArgumentList) >= 1 {
if call.Argument(0).IsNumber() {
sleep, _ := call.Argument(0).ToInteger()
time.Sleep(time.Duration(sleep) * time.Second)
return otto.TrueValue()
}
}
return throwJSExeception("usage: sleep(<sleep in seconds>)")
}
// SleepBlocks will wait for a specified number of new blocks or max for a
// given of seconds. sleepBlocks(nBlocks[, maxSleep]).
func (self *Jeth) SleepBlocks(call otto.FunctionCall) (response otto.Value) {
nBlocks := int64(0)
maxSleep := int64(9999999999999999) // indefinitely
nArgs := len(call.ArgumentList)
if nArgs == 0 {
throwJSExeception("usage: sleepBlocks(<n blocks>[, max sleep in seconds])")
}
if nArgs >= 1 {
if call.Argument(0).IsNumber() {
nBlocks, _ = call.Argument(0).ToInteger()
} else {
throwJSExeception("expected number as first argument")
}
}
if nArgs >= 2 {
if call.Argument(1).IsNumber() {
maxSleep, _ = call.Argument(1).ToInteger()
} else {
throwJSExeception("expected number as second argument")
}
}
// go through the console, this will allow web3 to call the appropriate
// callbacks if a delayed response or notification is received.
currentBlockNr := func() int64 {
result, err := call.Otto.Run("eth.blockNumber")
if err != nil {
throwJSExeception(err.Error())
}
blockNr, err := result.ToInteger()
if err != nil {
throwJSExeception(err.Error())
}
return blockNr
}
targetBlockNr := currentBlockNr() + nBlocks
deadline := time.Now().Add(time.Duration(maxSleep) * time.Second)
for time.Now().Before(deadline) {
if currentBlockNr() >= targetBlockNr {
return otto.TrueValue()
}
time.Sleep(time.Second)
}
return otto.FalseValue()
}