Added getVersion placeholder

Implementation of #38 on the multiepoch time.

multiepoch-getVersion.go

@@ -0,0 +1,31 @@
+package main
+
+import (
+  "context"
+  "fmt"
+
+  "github.com/sourcegraph/jsonrpc2"
+)
+
+// @TODO make these values make sense
+func (ser *MultiEpoch) handleGetVersion(ctx context.Context, conn *requestContext, req *jsonrpc2.Request) (*jsonrpc2.Error, error) {
+  // taken from solana mainnet version reponse
+  var versionResponse GetVersionResponse
+  versionResponse.FeatureSet = 1879391783
+  versionResponse.SolanaCore = "1.14.23"
+  var err = conn.Reply(
+          ctx,
+          req.ID,
+          versionResponse,
+          func(m map[string]any) map[string]any {
+                  r := map[string]any{}
+                  r["feature-set"] = m["featureSet"]
+                  r["solana-core"] = m["solanaCore"]
+                  return r
+          },
+  )
+  if err != nil {
+          return nil, fmt.Errorf("failed to reply: %w", err)
+  }
+  return nil, nil
+}

multiepoch.go

@@ -355,6 +355,8 @@ func (ser *MultiEpoch) handleRequest(ctx context.Context, conn *requestContext,
 		return ser.handleGetTransaction(ctx, conn, req)
 	case "getSignaturesForAddress":
 		return ser.handleGetSignaturesForAddress(ctx, conn, req)
+  case "getVersion":
+    return ser.handleGetVersion(ctx, conn, req)
 	default:
 		return &jsonrpc2.Error{
 			Code:    jsonrpc2.CodeMethodNotFound,

storage.go

@@ -125,6 +125,11 @@ type GetTransactionResponse struct {
 	Signatures  []solana.Signature `json:"-"` // TODO: enable this
 }
 
+type GetVersionResponse struct {
+  FeatureSet uint64 `json:"feature-set"`
+  SolanaCore string `json:"solana-core"`
+}
+
 func loadDataFromDataFrames(
 	firstDataFrame *ipldbindcode.DataFrame,
 	dataFrameGetter func(ctx context.Context, wantedCid cid.Cid) (*ipldbindcode.DataFrame, error),