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rpc: make RPC WSClient thread-safe

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Add ability to use unique request IDs for RPC requests.
This commit is contained in:
AnnaShaleva 2022-02-18 20:28:13 +03:00
parent 5b2e88b916
commit 8991ee91cd
5 changed files with 93 additions and 20 deletions
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15
pkg/rpc/client/client.go
View file

@ -17,6 +17,7 @@ import (
"github.com/nspcc-dev/neo-go/pkg/rpc/request"
"github.com/nspcc-dev/neo-go/pkg/rpc/response"
"github.com/nspcc-dev/neo-go/pkg/util"
"go.uber.org/atomic"
)
const (
@ -40,6 +41,12 @@ type Client struct {
// cache is mostly filled in during Init(), but can also be updated
// during regular Client lifecycle.
cache cache
latestReqID *atomic.Uint64
// getNextRequestID returns ID to be used for subsequent request creation.
// It is defined on Client so that our testing code can override this method
// for the sake of more predictable request IDs generation behaviour.
getNextRequestID func() uint64
}
// Options defines options for the RPC client.
@ -110,12 +117,18 @@ func New(ctx context.Context, endpoint string, opts Options) (*Client, error) {
cache: cache{
nativeHashes: make(map[string]util.Uint160),
},
latestReqID: atomic.NewUint64(0),
}
cl.getNextRequestID = (cl).getRequestID
cl.opts = opts
cl.requestF = cl.makeHTTPRequest
return cl, nil
}
func (c *Client) getRequestID() uint64 {
return c.latestReqID.Inc()
}
// Init sets magic of the network client connected to, stateRootInHeader option
// and native NEO, GAS and Policy contracts scripthashes. This method should be
// called before any header- or block-related requests in order to deserialize
@ -159,7 +172,7 @@ func (c *Client) performRequest(method string, p request.RawParams, v interface{
JSONRPC: request.JSONRPCVersion,
Method: method,
RawParams: p.Values,
ID: 1,
ID: c.getNextRequestID(),
}
raw, err := c.requestF(&r)

23
pkg/rpc/client/rpc_test.go
View file

@ -1705,6 +1705,7 @@ func TestRPCClients(t *testing.T) {
testRPCClient(t, func(ctx context.Context, endpoint string, opts Options) (*Client, error) {
c, err := New(ctx, endpoint, opts)
require.NoError(t, err)
c.getNextRequestID = getTestRequestID
require.NoError(t, c.Init())
return c, nil
})
@ -1713,6 +1714,7 @@ func TestRPCClients(t *testing.T) {
testRPCClient(t, func(ctx context.Context, endpoint string, opts Options) (*Client, error) {
wsc, err := NewWS(ctx, httpURLtoWS(endpoint), opts)
require.NoError(t, err)
wsc.getNextRequestID = getTestRequestID
require.NoError(t, wsc.Init())
return &wsc.Client, nil
})
@ -1732,6 +1734,7 @@ func testRPCClient(t *testing.T, newClient func(context.Context, string, Options
if err != nil {
t.Fatal(err)
}
c.getNextRequestID = getTestRequestID
actual, err := testCase.invoke(c)
if testCase.fails {
@ -1755,14 +1758,14 @@ func testRPCClient(t *testing.T, newClient func(context.Context, string, Options
endpoint := srv.URL
opts := Options{}
c, err := newClient(context.TODO(), endpoint, opts)
if err != nil {
t.Fatal(err)
}
for _, testCase := range testBatch {
t.Run(testCase.name, func(t *testing.T) {
_, err := testCase.invoke(c)
c, err := newClient(context.TODO(), endpoint, opts)
if err != nil {
t.Fatal(err)
}
c.getNextRequestID = getTestRequestID
_, err = testCase.invoke(c)
assert.Error(t, err)
})
}
@ -1878,6 +1881,7 @@ func TestCalculateValidUntilBlock(t *testing.T) {
if err != nil {
t.Fatal(err)
}
c.getNextRequestID = getTestRequestID
require.NoError(t, c.Init())
validUntilBlock, err := c.CalculateValidUntilBlock()
@ -1913,6 +1917,7 @@ func TestGetNetwork(t *testing.T) {
if err != nil {
t.Fatal(err)
}
c.getNextRequestID = getTestRequestID
// network was not initialised
_, err = c.GetNetwork()
require.True(t, errors.Is(err, errNetworkNotInitialized))
@ -1924,6 +1929,7 @@ func TestGetNetwork(t *testing.T) {
if err != nil {
t.Fatal(err)
}
c.getNextRequestID = getTestRequestID
require.NoError(t, c.Init())
m, err := c.GetNetwork()
require.NoError(t, err)
@ -1945,6 +1951,7 @@ func TestUninitedClient(t *testing.T) {
c, err := New(context.TODO(), endpoint, opts)
require.NoError(t, err)
c.getNextRequestID = getTestRequestID
_, err = c.GetBlockByIndex(0)
require.Error(t, err)
@ -1970,3 +1977,7 @@ func newTestNEF(script []byte) nef.File {
ne.Checksum = ne.CalculateChecksum()
return ne
}
func getTestRequestID() uint64 {
return 1
}

63
pkg/rpc/client/wsclient.go
View file

@ -4,6 +4,7 @@ import (
"context"
"encoding/json"
"errors"
"strconv"
"sync"
"time"
@ -31,14 +32,16 @@ type WSClient struct {
// be closed, so make sure to handle this.
Notifications chan Notification
ws *websocket.Conn
done chan struct{}
responses chan *response.Raw
requests chan *request.Raw
shutdown chan struct{}
ws *websocket.Conn
done chan struct{}
requests chan *request.Raw
shutdown chan struct{}
subscriptionsLock sync.RWMutex
subscriptions map[string]bool
respLock sync.RWMutex
respChannels map[uint64]chan *response.Raw
}
// Notification represents server-generated notification for client subscriptions.
@ -95,7 +98,7 @@ func NewWS(ctx context.Context, endpoint string, opts Options) (*WSClient, error
ws: ws,
shutdown: make(chan struct{}),
done: make(chan struct{}),
responses: make(chan *response.Raw),
respChannels: make(map[uint64]chan *response.Raw),
requests: make(chan *request.Raw),
subscriptions: make(map[string]bool),
}
@ -178,14 +181,27 @@ readloop:
resp.JSONRPC = rr.JSONRPC
resp.Error = rr.Error
resp.Result = rr.Result
c.responses <- resp
id, err := strconv.Atoi(string(resp.ID))
if err != nil {
break // Malformed response (invalid response ID).
}
ch := c.getResponseChannel(uint64(id))
if ch == nil {
break // Unknown response (unexpected response ID).
}
ch <- resp
} else {
// Malformed response, neither valid request, nor valid response.
break
}
}
close(c.done)
close(c.responses)
c.respLock.Lock()
for _, ch := range c.respChannels {
close(ch)
}
c.respChannels = nil
c.respLock.Unlock()
close(c.Notifications)
}
@ -220,16 +236,41 @@ func (c *WSClient) wsWriter() {
}
}
func (c *WSClient) registerRespChannel(id uint64, ch chan *response.Raw) {
c.respLock.Lock()
defer c.respLock.Unlock()
c.respChannels[id] = ch
}
func (c *WSClient) unregisterRespChannel(id uint64) {
c.respLock.Lock()
defer c.respLock.Unlock()
if ch, ok := c.respChannels[id]; ok {
delete(c.respChannels, id)
close(ch)
}
}
func (c *WSClient) getResponseChannel(id uint64) chan *response.Raw {
c.respLock.RLock()
defer c.respLock.RUnlock()
return c.respChannels[id]
}
func (c *WSClient) makeWsRequest(r *request.Raw) (*response.Raw, error) {
ch := make(chan *response.Raw)
c.registerRespChannel(r.ID, ch)
select {
case <-c.done:
return nil, errors.New("connection lost")
return nil, errors.New("connection lost before sending the request")
case c.requests <- r:
}
select {
case <-c.done:
return nil, errors.New("connection lost")
case resp := <-c.responses:
return nil, errors.New("connection lost while waiting for the response")
case resp := <-ch:
c.unregisterRespChannel(r.ID)
return resp, nil
}
}

8
pkg/rpc/client/wsclient_test.go
View file

@ -45,6 +45,7 @@ func TestWSClientSubscription(t *testing.T) {
srv := initTestServer(t, `{"jsonrpc": "2.0", "id": 1, "result": "55aaff00"}`)
wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
require.NoError(t, err)
wsc.getNextRequestID = getTestRequestID
require.NoError(t, wsc.Init())
id, err := f(wsc)
require.NoError(t, err)
@ -58,6 +59,7 @@ func TestWSClientSubscription(t *testing.T) {
srv := initTestServer(t, `{"jsonrpc": "2.0", "id": 1, "error":{"code":-32602,"message":"Invalid Params"}}`)
wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
require.NoError(t, err)
wsc.getNextRequestID = getTestRequestID
require.NoError(t, wsc.Init())
_, err = f(wsc)
require.Error(t, err)
@ -107,6 +109,7 @@ func TestWSClientUnsubscription(t *testing.T) {
srv := initTestServer(t, rc.response)
wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
require.NoError(t, err)
wsc.getNextRequestID = getTestRequestID
require.NoError(t, wsc.Init())
rc.code(t, wsc)
})
@ -143,6 +146,7 @@ func TestWSClientEvents(t *testing.T) {
wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
require.NoError(t, err)
wsc.getNextRequestID = getTestRequestID
wsc.cache.initDone = true // Our server mock is restricted, so perform initialisation manually.
wsc.cache.network = netmode.UnitTestNet
for range events {
@ -167,6 +171,7 @@ func TestWSExecutionVMStateCheck(t *testing.T) {
srv := initTestServer(t, `{"jsonrpc": "2.0", "id": 1, "result": "55aaff00"}`)
wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
require.NoError(t, err)
wsc.getNextRequestID = getTestRequestID
require.NoError(t, wsc.Init())
filter := "NONE"
_, err = wsc.SubscribeForTransactionExecutions(&filter)
@ -316,6 +321,7 @@ func TestWSFilteredSubscriptions(t *testing.T) {
}))
wsc, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
require.NoError(t, err)
wsc.getNextRequestID = getTestRequestID
wsc.cache.network = netmode.UnitTestNet
c.clientCode(t, wsc)
wsc.Close()
@ -329,6 +335,8 @@ func TestNewWS(t *testing.T) {
t.Run("good", func(t *testing.T) {
c, err := NewWS(context.TODO(), httpURLtoWS(srv.URL), Options{})
require.NoError(t, err)
c.getNextRequestID = getTestRequestID
c.cache.network = netmode.UnitTestNet
require.NoError(t, c.Init())
})
t.Run("bad URL", func(t *testing.T) {

4
pkg/rpc/request/types.go
View file

@ -32,12 +32,12 @@ func NewRawParams(vals ...interface{}) RawParams {
return p
}
// Raw represents JSON-RPC request.
// Raw represents JSON-RPC request on the Client side.
type Raw struct {
JSONRPC string `json:"jsonrpc"`
Method string `json:"method"`
RawParams []interface{} `json:"params"`
ID int `json:"id"`
ID uint64 `json:"id"`
}
// Request contains standard JSON-RPC 2.0 request and batch of