cmd/swarm, swarm/api: bzzr improve + networkid prio

fixes #3444
fixes #3494
networkid override

Added comments to explain why test against 0 appears twice

* Command line overrides saved config, saved config overrides system default

---

fixes #3476
bzzr get with path

Finally a hopefully clean commit for this PR
Added check for empty path to avoid SIGSEGV in path parser and resolver
Added requested tests for empty path and non-existing manifest.
However signature for StartHTTPServer had changed.
Now it's hacked as so:

	StartHttpServer(api.API, &Server{Addr: "127.0.0.1:8504", CorsString: ""})

* Parse url before resolve when path and ENS is supplied, example
* swarm/api/http proxy server test for retrieval of subpath through get
* Removed nil entry assignment on subtrie leaf in recursive key retrieval
* Cleaned up path-or-no-path condition in proxy server get handler
* swarm: processed with gofmt refers to lash/go-ethereum@90daa7a
* swarm: Added public access method Parse alias to parse
* swarm: processed with gofmt References nolash/go-ethereum@2ec3fd7
* Rename parse to Parse, removed alias

1 files changed, 117 insertions, 0 deletions

diff --git a/swarm/api/http/server_test.go b/swarm/api/http/server_test.go
new file mode 100644
index 000000000..664313afa
--- /dev/null
+++ b/swarm/api/http/server_test.go
@@ -0,0 +1,117 @@
+package http
+
+import (
+	"bytes"
+	"io/ioutil"
+	"net/http"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/ethereum/go-ethereum/common"
+	"github.com/ethereum/go-ethereum/swarm/api"
+	"github.com/ethereum/go-ethereum/swarm/storage"
+)
+
+func TestBzzrGetPath(t *testing.T) {
+
+	var err error
+
+	maxproxyattempts := 3
+
+	testmanifest := []string{
+		`{"entries":[{"path":"a/","hash":"674af7073604ebfc0282a4ab21e5ef1a3c22913866879ebc0816f8a89896b2ed","contentType":"application/bzz-manifest+json","status":0}]}`,
+		`{"entries":[{"path":"a","hash":"011b4d03dd8c01f1049143cf9c4c817e4b167f1d1b83e5c6f0f10d89ba1e7bce","contentType":"","status":0},{"path":"b/","hash":"0a87b1c3e4bf013686cdf107ec58590f2004610ee58cc2240f26939f691215f5","contentType":"application/bzz-manifest+json","status":0}]}`,
+		`{"entries":[{"path":"b","hash":"011b4d03dd8c01f1049143cf9c4c817e4b167f1d1b83e5c6f0f10d89ba1e7bce","contentType":"","status":0},{"path":"c","hash":"011b4d03dd8c01f1049143cf9c4c817e4b167f1d1b83e5c6f0f10d89ba1e7bce","contentType":"","status":0}]}`,
+	}
+
+	testrequests := make(map[string]int)
+	testrequests["/"] = 0
+	testrequests["/a"] = 1
+	testrequests["/a/b"] = 2
+	testrequests["/x"] = 0
+	testrequests[""] = 0
+
+	expectedfailrequests := []string{"", "/x"}
+
+	reader := [3]*bytes.Reader{}
+
+	key := [3]storage.Key{}
+
+	dir, _ := ioutil.TempDir("", "bzz-storage-test")
+
+	storeparams := &storage.StoreParams{
+		ChunkDbPath:   dir,
+		DbCapacity:    5000000,
+		CacheCapacity: 5000,
+		Radius:        0,
+	}
+
+	localStore, err := storage.NewLocalStore(storage.MakeHashFunc("SHA3"), storeparams)
+	if err != nil {
+		t.Fatal(err)
+	}
+	chunker := storage.NewTreeChunker(storage.NewChunkerParams())
+	dpa := &storage.DPA{
+		Chunker:    chunker,
+		ChunkStore: localStore,
+	}
+	dpa.Start()
+	defer dpa.Stop()
+
+	wg := &sync.WaitGroup{}
+
+	for i, mf := range testmanifest {
+		reader[i] = bytes.NewReader([]byte(mf))
+		key[i], err = dpa.Store(reader[i], int64(len(mf)), wg, nil)
+		if err != nil {
+			t.Fatal(err)
+		}
+		wg.Wait()
+	}
+
+	a := api.NewApi(dpa, nil)
+
+	/// \todo iterate port numbers up if fail
+	StartHttpServer(a, &Server{Addr: "127.0.0.1:8504", CorsString: ""})
+	// how to wait for ListenAndServe to have initialized? This is pretty cruuuude
+	// if we fix it we don't need maxproxyattempts anymore either
+	time.Sleep(1000 * time.Millisecond)
+	for i := 0; i <= maxproxyattempts; i++ {
+		_, err := http.Get("http://127.0.0.1:8504/bzzr:/" + common.ToHex(key[0])[2:] + "/a")
+		if i == maxproxyattempts {
+			t.Fatalf("Failed to connect to proxy after %v attempts: %v", i, err)
+		} else if err != nil {
+			time.Sleep(100 * time.Millisecond)
+			continue
+		}
+		break
+	}
+
+	for k, v := range testrequests {
+		var resp *http.Response
+		var respbody []byte
+
+		url := "http://127.0.0.1:8504/bzzr:/"
+		if k[:] != "" {
+			url += common.ToHex(key[0])[2:] + "/" + k[1:] + "?content_type=text/plain"
+		}
+		resp, err = http.Get(url)
+		defer resp.Body.Close()
+		respbody, err = ioutil.ReadAll(resp.Body)
+
+		if string(respbody) != testmanifest[v] {
+			isexpectedfailrequest := false
+
+			for _, r := range expectedfailrequests {
+				if k[:] == r {
+					isexpectedfailrequest = true
+				}
+			}
+			if isexpectedfailrequest == false {
+				t.Fatalf("Response body does not match, expected: %v, got %v", testmanifest[v], string(respbody))
+			}
+		}
+	}
+
+}