telegraf/plugins/inputs/graylog/graylog_test.go

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package graylog
import (
"io/ioutil"
"net/http"
"strings"
"testing"
"github.com/influxdata/telegraf/testutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
const validJSON = `
{
"total": 3,
"metrics": [
{
"full_name": "jvm.cl.loaded",
"metric": {
"value": 18910
},
"name": "loaded",
"type": "gauge"
},
{
"full_name": "jvm.memory.pools.Metaspace.committed",
"metric": {
"value": 108040192
},
"name": "committed",
"type": "gauge"
},
{
"full_name": "org.graylog2.shared.journal.KafkaJournal.writeTime",
"metric": {
"time": {
"min": 99
},
"rate": {
"total": 10,
"mean": 2
},
"duration_unit": "microseconds",
"rate_unit": "events/second"
},
"name": "writeTime",
"type": "hdrtimer"
}
]
}`
var validTags = map[string]map[string]string{
"jvm.cl.loaded": {
"name": "loaded",
"type": "gauge",
"port": "12900",
"server": "localhost",
},
"jvm.memory.pools.Metaspace.committed": {
"name": "committed",
"type": "gauge",
"port": "12900",
"server": "localhost",
},
"org.graylog2.shared.journal.KafkaJournal.writeTime": {
"name": "writeTime",
"type": "hdrtimer",
"port": "12900",
"server": "localhost",
},
}
var expectedFields = map[string]map[string]interface{}{
"jvm.cl.loaded": {
"value": float64(18910),
},
"jvm.memory.pools.Metaspace.committed": {
"value": float64(108040192),
},
"org.graylog2.shared.journal.KafkaJournal.writeTime": {
"time_min": float64(99),
"rate_total": float64(10),
"rate_mean": float64(2),
},
}
const invalidJSON = "I don't think this is JSON"
const empty = ""
type mockHTTPClient struct {
responseBody string
statusCode int
}
// Mock implementation of MakeRequest. Usually returns an http.Response with
// hard-coded responseBody and statusCode. However, if the request uses a
// nonstandard method, it uses status code 405 (method not allowed)
func (c *mockHTTPClient) MakeRequest(req *http.Request) (*http.Response, error) {
resp := http.Response{}
resp.StatusCode = c.statusCode
// basic error checking on request method
allowedMethods := []string{"GET", "HEAD", "POST", "PUT", "DELETE", "TRACE", "CONNECT"}
methodValid := false
for _, method := range allowedMethods {
if req.Method == method {
methodValid = true
break
}
}
if !methodValid {
resp.StatusCode = 405 // Method not allowed
}
resp.Body = ioutil.NopCloser(strings.NewReader(c.responseBody))
return &resp, nil
}
func (c *mockHTTPClient) SetHTTPClient(_ *http.Client) {
}
func (c *mockHTTPClient) HTTPClient() *http.Client {
return nil
}
// Generates a pointer to an HttpJson object that uses a mock HTTP client.
// Parameters:
// response : Body of the response that the mock HTTP client should return
// statusCode: HTTP status code the mock HTTP client should return
//
// Returns:
// *HttpJson: Pointer to an HttpJson object that uses the generated mock HTTP client
func genMockGrayLog(response string, statusCode int) []*GrayLog {
return []*GrayLog{
&GrayLog{
client: &mockHTTPClient{responseBody: response, statusCode: statusCode},
Servers: []string{
"http://localhost:12900/system/metrics/multiple",
},
Metrics: []string{
"jvm.memory.pools.Metaspace.committed",
"jvm.cl.loaded",
"org.graylog2.shared.journal.KafkaJournal.writeTime",
},
Username: "test",
Password: "test",
},
}
}
// Test that the proper values are ignored or collected
func TestNormalResponse(t *testing.T) {
graylog := genMockGrayLog(validJSON, 200)
for _, service := range graylog {
var acc testutil.Accumulator
err := service.Gather(&acc)
require.NoError(t, err)
for k, v := range expectedFields {
acc.AssertContainsTaggedFields(t, k, v, validTags[k])
}
}
}
// Test response to HTTP 500
func TestHttpJson500(t *testing.T) {
graylog := genMockGrayLog(validJSON, 500)
var acc testutil.Accumulator
err := graylog[0].Gather(&acc)
assert.NotNil(t, err)
assert.Equal(t, 0, acc.NFields())
}
// Test response to malformed JSON
func TestHttpJsonBadJson(t *testing.T) {
graylog := genMockGrayLog(invalidJSON, 200)
var acc testutil.Accumulator
err := graylog[0].Gather(&acc)
assert.NotNil(t, err)
assert.Equal(t, 0, acc.NFields())
}
// Test response to empty string as response objectgT
func TestHttpJsonEmptyResponse(t *testing.T) {
graylog := genMockGrayLog(empty, 200)
var acc testutil.Accumulator
err := graylog[0].Gather(&acc)
assert.NotNil(t, err)
assert.Equal(t, 0, acc.NFields())
}