status-go/geth/rpc/route.go

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package rpc
// router implements logic for routing
// JSON-RPC requests either to Upstream or
// Local node.
type router struct {
methods map[string]bool
upstreamEnabled bool
}
// newRouter inits new router.
func newRouter(upstreamEnabled bool) *router {
r := &router{
methods: make(map[string]bool),
upstreamEnabled: upstreamEnabled,
}
for _, m := range remoteMethods {
r.methods[m] = true
}
return r
}
// routeRemote returns true if given method should be routed to the remote node
func (r *router) routeRemote(method string) bool {
if !r.upstreamEnabled {
return false
}
// else check route using the methods list
return r.methods[method]
}
// remoteMethods contains methods that should be routed to
// the upstream node; the rest is considered to be routed to
// the local node.
// A list of supported methods: https://infura.io/docs/#supported-json-rpc-methods
// TODO(tiabc): Write a test on each of these methods to ensure they're all routed to the proper node and ensure they really work
// TODO(tiabc: as we already caught https://github.com/status-im/status-go/issues/350 as the result of missing such test.
// Although it's tempting to only list methods coming to the local node as there're fewer of them
// but it's deceptive: we want to ensure that only known requests leave our zone of responsibility.
// Also, we want new requests in newer Geth versions not to be accidentally routed to the upstream.
// The list of methods: https://github.com/ethereum/wiki/wiki/JSON-RPC
var remoteMethods = [...]string{
"eth_protocolVersion",
"eth_syncing",
"eth_coinbase",
"eth_mining",
"eth_hashrate",
"eth_gasPrice",
//"eth_accounts", // due to sub-accounts handling
"eth_blockNumber",
"eth_getBalance",
"eth_getStorageAt",
"eth_getTransactionCount",
"eth_getBlockTransactionCountByHash",
"eth_getBlockTransactionCountByNumber",
"eth_getUncleCountByBlockHash",
"eth_getUncleCountByBlockNumber",
"eth_getCode",
//"eth_sign", // only the local node has an injected account to sign the payload with
//"eth_sendTransaction", // we handle this specially calling eth_estimateGas, signing it locally and sending eth_sendRawTransaction afterwards
"eth_sendRawTransaction",
"eth_call",
"eth_estimateGas",
"eth_getBlockByHash",
"eth_getBlockByNumber",
"eth_getTransactionByHash",
"eth_getTransactionByBlockHashAndIndex",
"eth_getTransactionByBlockNumberAndIndex",
"eth_getTransactionReceipt",
"eth_getUncleByBlockHashAndIndex",
"eth_getUncleByBlockNumberAndIndex",
//"eth_getCompilers", // goes to the local because there's no need to send it anywhere
//"eth_compileLLL", // goes to the local because there's no need to send it anywhere
//"eth_compileSolidity", // goes to the local because there's no need to send it anywhere
//"eth_compileSerpent", // goes to the local because there's no need to send it anywhere
"eth_newFilter",
"eth_newBlockFilter",
"eth_newPendingTransactionFilter",
"eth_uninstallFilter",
"eth_getFilterChanges",
"eth_getFilterLogs",
"eth_getLogs",
"eth_getWork",
"eth_submitWork",
"eth_submitHashrate",
"net_version",
"net_peerCount",
"net_listening",
}