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")
+                    .setMethod(call.method)
-                    .setTarget(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
         }
     }

src/test/groovy/io/emeraldpay/dshackle/rpc/NativeCallSpec.groovy

@@ -155,7 +155,7 @@ class NativeCallSpec extends Specification {
             .addAllItems([1, 2].collect { id ->
                 return BlockchainOuterClass.NativeCallItem.newBuilder()
                 .setId(id)
-                .setTarget("eth_test")
+                .setMethod("eth_test")
                 .build()
             })
             .build()
@@ -178,7 +178,7 @@ class NativeCallSpec extends Specification {
                 .addAllItems([1, 2].collect { id ->
                     return BlockchainOuterClass.NativeCallItem.newBuilder()
                             .setId(id)
-                            .setTarget("eth_test")
+                            .setMethod("eth_test")
                             .build()
                 })
                 .build()

src/test/groovy/io/emeraldpay/dshackle/test/EthereumApiMock.groovy

@@ -54,7 +54,7 @@ class EthereumApiMock extends EthereumApi {
 
     def nativeCall(BlockchainOuterClass.NativeCallRequest request, StreamObserver<BlockchainOuterClass.NativeCallReplyItem> responseObserver) {
         request.itemsList.forEach { req ->
-            def resp = execute(req.id, req.target, objectMapper.readerFor(List).readValue(req.payload.toByteArray()))
+            def resp = execute(req.id, req.method, objectMapper.readerFor(List).readValue(req.payload.toByteArray()))
             resp.subscribe {
                 def proto = BlockchainOuterClass.NativeCallReplyItem.newBuilder()
                         .setId(req.id)

src/test/groovy/io/emeraldpay/dshackle/upstream/EthereumGrpcTransportSpec.groovy

@@ -58,7 +58,7 @@ class EthereumGrpcTransportSpec extends Specification {
             chain.number == Chain.ETHEREUM.id
             itemsCount == 1
             with(getItems(0)) {
-                target == "eth_test"
+                method == "eth_test"
                 payload.toStringUtf8() == "[1]"
             }
         }
@@ -106,11 +106,11 @@ class EthereumGrpcTransportSpec extends Specification {
             chain.number == Chain.ETHEREUM.id
             itemsCount == 2
             with(getItems(0)) {
-                target == "eth_test"
+                method == "eth_test"
                 payload.toStringUtf8() == "[1]"
             }
             with(getItems(1)) {
-                target == "eth_test2"
+                method == "eth_test2"
                 payload.toStringUtf8() == "[2,\"3\"]"
             }
         }