refactor scraper into modules

2 files changed, 69 insertions, 0 deletions

diff --git a/modules/followlinks/followlinks.go b/modules/followlinks/followlinks.go
new file mode 100644
index 0000000..dde0e90
--- /dev/null
+++ b/modules/followlinks/followlinks.go
@@ -0,0 +1,30 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package followlinks
+
+import (
+	"github.com/philippta/flyscrape"
+)
+
+func init() {
+	flyscrape.RegisterModule(new(Module))
+}
+
+type Module struct{}
+
+func (m *Module) ID() string {
+	return "followlinks"
+}
+
+func (m *Module) OnResponse(resp *flyscrape.Response) {
+	for _, link := range flyscrape.ParseLinks(resp.HTML, resp.URL) {
+		resp.Visit(link)
+	}
+}
+
+var (
+	_ flyscrape.Module     = (*Module)(nil)
+	_ flyscrape.OnResponse = (*Module)(nil)
+)
diff --git a/modules/followlinks/followlinks_test.go b/modules/followlinks/followlinks_test.go
new file mode 100644
index 0000000..03c3a6b
--- /dev/null
+++ b/modules/followlinks/followlinks_test.go
@@ -0,0 +1,39 @@
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+package followlinks_test
+
+import (
+	"testing"
+
+	"github.com/philippta/flyscrape"
+	"github.com/philippta/flyscrape/modules/followlinks"
+	"github.com/philippta/flyscrape/modules/starturl"
+	"github.com/stretchr/testify/require"
+)
+
+func TestFollowLinks(t *testing.T) {
+	scraper := flyscrape.NewScraper()
+	scraper.LoadModule(&starturl.Module{URL: "http://www.example.com/foo/bar"})
+	scraper.LoadModule(&followlinks.Module{})
+
+	scraper.SetTransport(flyscrape.MockTransport(200, `
+        <a href="/baz">Baz</a>
+        <a href="baz">Baz</a>
+        <a href="http://www.google.com">Google</a>`))
+
+	var urls []string
+	scraper.OnRequest(func(req *flyscrape.Request) {
+		urls = append(urls, req.URL)
+	})
+
+	scraper.Run()
+
+	require.Len(t, urls, 5)
+	require.Contains(t, urls, "http://www.example.com/baz")
+	require.Contains(t, urls, "http://www.example.com/foo/bar")
+	require.Contains(t, urls, "http://www.example.com/foo/baz")
+	require.Contains(t, urls, "http://www.google.com/")
+	require.Contains(t, urls, "http://www.google.com/baz")
+}