[coordinator] Influxdb importer endpoint (at /api/v1/influxdb/write)

glide.yaml

@@ -1,5 +1,10 @@
 package: github.com/m3db/m3
 import:
+  - package: github.com/influxdata/influxdb
+    version: 01c8dd416270f424ab0c40f9291e269ac6921964
+    subpackages:
+      - models
+
   - package: github.com/m3db/bitset
     version: 07973db6b78acb62ac207d0538055e874b49d90d
 

src/query/api/v1/handler/influxdb/rewrite.go

@@ -0,0 +1,91 @@
+// Copyright (c) 2019 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package influxdb
+
+import (
+	"regexp"
+)
+
+type regexpRewriter struct {
+	okStart, okRest [256]bool
+	replacement     byte
+}
+
+func newRegexpRewriter(startRe, restRe string) *regexpRewriter {
+	createArray := func(okRe string) (ret [256]bool) {
+		re := regexp.MustCompile(okRe)
+		// Check for only 7 bit non-control ASCII characters
+		for i := 32; i < 128; i++ {
+			if re.Match([]byte{byte(i)}) {
+				ret[i] = true
+			}
+		}
+		return
+	}
+	return &regexpRewriter{okStart: createArray(startRe), okRest: createArray(restRe), replacement: byte('_')}
+}
+
+func (rr *regexpRewriter) rewrite(input []byte) {
+	if len(input) == 0 {
+		return
+	}
+	if !rr.okStart[input[0]] {
+		input[0] = rr.replacement
+	}
+	for i := 1; i < len(input); i++ {
+		if !rr.okRest[input[i]] {
+			input[i] = rr.replacement
+		}
+	}
+}
+
+// Utility, which handles both __name__ ('metric') tag, as well as
+// rest of tags ('labels')
+//
+// It allow using any influxdb client, rewriting the tag names + the
+// magic __name__ tag to match what Prometheus expects
+type promRewriter struct {
+	metric, metricTail, label *regexpRewriter
+}
+
+func newPromRewriter() *promRewriter {
+	return &promRewriter{
+		metric: newRegexpRewriter(
+			"[a-zA-Z_:]",
+			"[a-zA-Z0-9_:]"),
+		metricTail: newRegexpRewriter(
+			"[a-zA-Z0-9_:]",
+			"[a-zA-Z0-9_:]"),
+		label: newRegexpRewriter(
+			"[a-zA-Z_]", "[a-zA-Z0-9_]")}
+}
+
+func (pr *promRewriter) rewriteMetric(data []byte) {
+	pr.metric.rewrite(data)
+}
+
+func (pr *promRewriter) rewriteMetricTail(data []byte) {
+	pr.metricTail.rewrite(data)
+}
+
+func (pr *promRewriter) rewriteLabel(data []byte) {
+	pr.label.rewrite(data)
+}

src/query/api/v1/handler/influxdb/rewrite_test.go

@@ -0,0 +1,53 @@
+// Copyright (c) 2019 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+package influxdb
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type test struct {
+	in, outMetric, outMetricTail, outLabel string
+}
+
+func TestPromRewriter(t *testing.T) {
+	r := newPromRewriter()
+	tests := []test{{"foo", "foo", "foo", "foo"},
+		{".bar", "_bar", "_bar", "_bar"},
+		{"b.ar", "b_ar", "b_ar", "b_ar"},
+		{":bar", ":bar", ":bar", "_bar"},
+		{"ba:r", "ba:r", "ba:r", "ba_r"},
+		{"9bar", "_bar", "9bar", "_bar"},
+	}
+	for _, test := range tests {
+		in1 := []byte(test.in)
+		r.rewriteMetric(in1)
+		assert.Equal(t, test.outMetric, string(in1))
+		in2 := []byte(test.in)
+		r.rewriteMetricTail(in2)
+		assert.Equal(t, test.outMetricTail, string(in2))
+		in3 := []byte(test.in)
+		r.rewriteLabel(in3)
+		assert.Equal(t, test.outLabel, string(in3))
+	}
+}