From cb202f7f761090c9d4ff958684a3560e7b5edd35 Mon Sep 17 00:00:00 2001
From: Henrique Dias <hacdias@gmail.com>
Date: Mon, 15 May 2023 12:09:42 +0200
Subject: [PATCH] fix: add newline in NDJSON responses

---
 routing/http/server/server.go      |  6 +++
 routing/http/server/server_test.go | 68 ++++++++++++++++++++++++++++++
 2 files changed, 74 insertions(+)

diff --git a/routing/http/server/server.go b/routing/http/server/server.go
index 8ce7d063b..86e868361 100644
--- a/routing/http/server/server.go
+++ b/routing/http/server/server.go
@@ -254,6 +254,12 @@ func (s *server) findProvidersNDJSON(w http.ResponseWriter, provIter iter.Result
 			logger.Warn("FindProviders ndjson write error", "Error", err)
 			return
 		}
+
+		_, err = w.Write([]byte("\n"))
+		if err != nil {
+			logger.Warn("FindProviders ndjson write error", "Error", err)
+			return
+		}
 		if f, ok := w.(http.Flusher); ok {
 			f.Flush()
 		}
diff --git a/routing/http/server/server_test.go b/routing/http/server/server_test.go
index fec5eaf9a..380846801 100644
--- a/routing/http/server/server_test.go
+++ b/routing/http/server/server_test.go
@@ -2,6 +2,7 @@ package server
 
 import (
 	"context"
+	"io"
 	"net/http"
 	"net/http/httptest"
 	"testing"
@@ -10,6 +11,7 @@ import (
 	"github.com/ipfs/boxo/routing/http/types"
 	"github.com/ipfs/boxo/routing/http/types/iter"
 	"github.com/ipfs/go-cid"
+	"github.com/libp2p/go-libp2p/core/peer"
 	"github.com/stretchr/testify/mock"
 	"github.com/stretchr/testify/require"
 )
@@ -48,6 +50,72 @@ func TestHeaders(t *testing.T) {
 	require.Equal(t, "text/plain; charset=utf-8", header)
 }
 
+func TestResponse(t *testing.T) {
+	router := &mockContentRouter{}
+	server := httptest.NewServer(Handler(router))
+	t.Cleanup(server.Close)
+	serverAddr := "http://" + server.Listener.Addr().String()
+
+	pidStr := "12D3KooWM8sovaEGU1bmiWGWAzvs47DEcXKZZTuJnpQyVTkRs2Vn"
+	cidStr := "bafkreifjjcie6lypi6ny7amxnfftagclbuxndqonfipmb64f2km2devei4"
+
+	pid, err := peer.Decode(pidStr)
+	require.NoError(t, err)
+
+	cid, err := cid.Decode(cidStr)
+	require.NoError(t, err)
+
+	results := iter.FromSlice([]iter.Result[types.ProviderResponse]{
+		{Val: &types.ReadBitswapProviderRecord{
+			Protocol: "transport-bitswap",
+			Schema:   types.SchemaBitswap,
+			ID:       &pid,
+			Addrs:    []types.Multiaddr{},
+		}}},
+	)
+
+	router.On("FindProviders", mock.Anything, cid, mock.Anything).Return(results, nil)
+	urlStr := serverAddr + ProvidePath + cidStr
+
+	t.Run("JSON Response", func(t *testing.T) {
+		t.Parallel()
+
+		req, err := http.NewRequest(http.MethodGet, urlStr, nil)
+		require.NoError(t, err)
+		req.Header.Set("Accept", mediaTypeJSON)
+
+		resp, err := http.DefaultClient.Do(req)
+		require.NoError(t, err)
+		require.Equal(t, 200, resp.StatusCode)
+		header := resp.Header.Get("Content-Type")
+		require.Equal(t, mediaTypeJSON, header)
+
+		body, err := io.ReadAll(resp.Body)
+		require.NoError(t, err)
+
+		require.Equal(t, string(body), `{"Providers":[{"Protocol":"transport-bitswap","Schema":"bitswap","ID":"12D3KooWM8sovaEGU1bmiWGWAzvs47DEcXKZZTuJnpQyVTkRs2Vn","Addrs":[]}]}`)
+	})
+
+	t.Run("NDJSON Response", func(t *testing.T) {
+		t.Parallel()
+
+		req, err := http.NewRequest(http.MethodGet, urlStr, nil)
+		require.NoError(t, err)
+		req.Header.Set("Accept", mediaTypeNDJSON)
+
+		resp, err := http.DefaultClient.Do(req)
+		require.NoError(t, err)
+		require.Equal(t, 200, resp.StatusCode)
+		header := resp.Header.Get("Content-Type")
+		require.Equal(t, mediaTypeNDJSON, header)
+
+		body, err := io.ReadAll(resp.Body)
+		require.NoError(t, err)
+
+		require.Equal(t, string(body), `{"Protocol":"transport-bitswap","Schema":"bitswap","ID":"12D3KooWM8sovaEGU1bmiWGWAzvs47DEcXKZZTuJnpQyVTkRs2Vn","Addrs":[]}`+"\n")
+	})
+}
+
 type mockContentRouter struct{ mock.Mock }
 
 func (m *mockContentRouter) FindProviders(ctx context.Context, key cid.Cid) (iter.ResultIter[types.ProviderResponse], error) {