solution: rename grpc target to method

src/main/kotlin/io/emeraldpay/dshackle/rpc/Describe.kt

@@ -3,8 +3,6 @@ package io.emeraldpay.dshackle.rpc
 import io.emeraldpay.api.proto.BlockchainOuterClass
 import io.emeraldpay.api.proto.Common
 import io.emeraldpay.dshackle.upstream.*
-import io.emeraldpay.grpc.Chain
-import io.grpc.stub.StreamObserver
 import org.springframework.beans.factory.annotation.Autowired
 import org.springframework.stereotype.Service
 import reactor.core.publisher.Mono
@@ -24,7 +22,7 @@ class Describe(
                     val targets = chainUpstreams.getSupportedTargets()
                     val chainDescription = BlockchainOuterClass.DescribeChain.newBuilder()
                             .setChain(Common.ChainRef.forNumber(chain.id))
-                            .addAllSupportedTargets(targets)
+                            .addAllSupportedMethods(targets)
                             .setStatus(status)
                     chainUpstreams.getAll().let { ups ->
                         ups.forEach { up ->

src/main/kotlin/io/emeraldpay/dshackle/rpc/NativeCall.kt

@@ -80,7 +80,7 @@ class NativeCall(
         val matcher = Selector.convertToMatcher(request.selector)
         val apis = upstream.getApis(matcher)
         return request.itemsList.toFlux().map {
-            val method = it.target
+            val method = it.method
             val params = it.payload.toStringUtf8()
             val callQuorum = upstream.targets?.getQuorumFor(method) ?: AlwaysQuorum()
             callQuorum.init(upstream.getHead())

src/main/kotlin/io/emeraldpay/dshackle/upstream/EthereumGrpcTransport.kt

@@ -89,8 +89,7 @@ class EthereumGrpcTransport(
             val params = objectMapper.writeValueAsBytes(call.params)
             val nativeCallItem = BlockchainOuterClass.NativeCallItem.newBuilder()
                     .setId(id)
-                    .setMethod("POST")
-                    .setTarget(call.method)
+                    .setMethod(call.method)
                     .setPayload(ByteString.copyFrom(params))
                     .build()
             req.addItems(nativeCallItem)

src/main/kotlin/io/emeraldpay/dshackle/upstream/GrpcUpstream.kt

@@ -112,7 +112,7 @@ open class GrpcUpstream(
     }
 
     fun init(conf: BlockchainOuterClass.DescribeChain) {
-        supportedMethods.addAll(conf.supportedTargetsList)
+        supportedMethods.addAll(conf.supportedMethodsList)
         val nodes = NodeDetailsList()
         conf.nodesList.forEach { node ->
             val node = NodeDetailsList.NodeDetails(node.quorum,

src/main/kotlin/io/emeraldpay/dshackle/upstream/UpstreamValidator.kt

@@ -26,7 +26,6 @@ class UpstreamValidator(
             }
             return UpstreamAvailability.OK
         } catch (e: Throwable) {
-            e.printStackTrace()
             return UpstreamAvailability.UNAVAILABLE
         }
     }