rpcsrv: add SessionEnabled, MaxIteratorResultItems to getversion

Extend getversion RPC response with RPC server settings (SessionEnabled,
MaxIteratorResultItems).Port neo-project/neo-modules#878.

Close #3276

Signed-off-by: Ekaterina Pavlova <[email protected]>

Author: AliceInHunterland

pkg/neorpc/result/version.go

@@ -19,6 +19,13 @@ type (
 		Nonce     uint32   `json:"nonce"`
 		UserAgent string   `json:"useragent"`
 		Protocol  Protocol `json:"protocol"`
+		RPC       RPC      `json:"rpc"`
+	}
+
+	// RPC represents the RPC server configuration.
+	RPC struct {
+		MaxIteratorResultItems int
+		SessionEnabled         bool
 	}
 
 	// Protocol represents network-dependent parameters.
@@ -48,6 +55,12 @@ type (
 		ValidatorsHistory map[uint32]uint32
 	}
 
+	// rpcMarshallerAux is an auxiliary struct used for RPC JSON marshalling.
+	rpcMarshallerAux struct {
+		MaxIteratorResultItems int  `json:"maxiteratorresultitems"`
+		SessionEnabled         bool `json:"sessionenabled"`
+	}
+
 	// protocolMarshallerAux is an auxiliary struct used for Protocol JSON marshalling.
 	protocolMarshallerAux struct {
 		AddressVersion              byte          `json:"addressversion"`
@@ -77,6 +90,15 @@ type (
 // prefixHardfork is a prefix used for hardfork names in C# node.
 const prefixHardfork = "HF_"
 
+// MarshalJSON implements the JSON marshaler interface.
+func (r RPC) MarshalJSON() ([]byte, error) {
+	aux := rpcMarshallerAux{
+		MaxIteratorResultItems: r.MaxIteratorResultItems,
+		SessionEnabled:         r.SessionEnabled,
+	}
+	return json.Marshal(aux)
+}
+
 // MarshalJSON implements the JSON marshaler interface.
 func (p Protocol) MarshalJSON() ([]byte, error) {
 	// Keep hardforks sorted by name in the result.
@@ -109,6 +131,18 @@ func (p Protocol) MarshalJSON() ([]byte, error) {
 	return json.Marshal(aux)
 }
 
+// UnmarshalJSON implements the JSON unmarshaler interface.
+func (r *RPC) UnmarshalJSON(data []byte) error {
+	var aux rpcMarshallerAux
+	err := json.Unmarshal(data, &aux)
+	if err != nil {
+		return err
+	}
+	r.MaxIteratorResultItems = aux.MaxIteratorResultItems
+	r.SessionEnabled = aux.SessionEnabled
+	return nil
+}
+
 // UnmarshalJSON implements the JSON unmarshaler interface.
 func (p *Protocol) UnmarshalJSON(data []byte) error {
 	var aux protocolMarshallerAux

pkg/neorpc/result/version_test.go

@@ -42,6 +42,10 @@ func TestVersion_MarshalUnmarshalJSON(t *testing.T) {
             "validatorscount": 7,
             "hardforks": [{"name": "Aspidochelone", "blockheight": 123}, {"name": "Basilisk", "blockheight": 1234}]
         },
+        "rpc": {
+            "maxiteratorresultitems": 0,
+            "sessionenabled": false
+        },
         "tcpport": 10333,
         "useragent": "/NEO-GO:0.98.6/",
         "wsport": 10334
@@ -69,6 +73,9 @@ func TestVersion_MarshalUnmarshalJSON(t *testing.T) {
 		WSPort:    10334,
 		Nonce:     1677922561,
 		UserAgent: "/NEO-GO:0.98.6/",
+		RPC: RPC{
+			MaxIteratorResultItems: 0,
+			SessionEnabled:         false},
 		Protocol: Protocol{
 			AddressVersion:              53,
 			Network:                     860833102,

pkg/services/rpcsrv/server.go

@@ -868,6 +868,9 @@ func (s *Server) getVersion(_ params.Params) (any, *neorpc.Error) {
 		TCPPort:   port,
 		Nonce:     s.coreServer.ID(),
 		UserAgent: s.coreServer.UserAgent,
+		RPC: result.RPC{
+			MaxIteratorResultItems: s.config.MaxIteratorResultItems,
+			SessionEnabled:         s.config.SessionEnabled},
 		Protocol: result.Protocol{
 			AddressVersion:              address.NEO3Prefix,
 			Network:                     cfg.Magic,