swarm: push tags integration - request flow

swarm/api: integrate tags to count chunks being split and stored
swarm/api/http: integrate tags in middleware for HTTP `POST` calls and assert chunks being calculated and counted correctly
swarm: remove deprecated and unused code, add swarm hash to DoneSplit signature, remove calls to the api client from the http package

swarm/testutil/tag.go

@@ -0,0 +1,51 @@
+// Copyright 2019 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package testutil
+
+import (
+	"testing"
+
+	"github.com/ethereum/go-ethereum/swarm/chunk"
+)
+
+// CheckTag checks the first tag in the api struct to be in a certain state
+func CheckTag(t *testing.T, tag *chunk.Tag, split, stored, seen, total int64) {
+	t.Helper()
+	if tag == nil {
+		t.Fatal("no tag found")
+	}
+
+	tSplit := tag.Get(chunk.StateSplit)
+	if tSplit != split {
+		t.Fatalf("should have had split chunks, got %d want %d", tSplit, split)
+	}
+
+	tSeen := tag.Get(chunk.StateSeen)
+	if tSeen != seen {
+		t.Fatalf("should have had seen chunks, got %d want %d", tSeen, seen)
+	}
+
+	tStored := tag.Get(chunk.StateStored)
+	if tStored != stored {
+		t.Fatalf("mismatch stored chunks, got %d want %d", tStored, stored)
+	}
+
+	tTotal := tag.Total()
+	if tTotal != total {
+		t.Fatalf("mismatch total chunks, got %d want %d", tTotal, total)
+	}
+}