telegraf/plugins/inputs/httpjson/httpjson_test.go

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package httpjson
import (
"io/ioutil"
"net/http"
"strings"
"testing"
"github.com/influxdb/telegraf/testutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
const validJSON = `
{
"parent": {
"child": 3,
"ignored_child": "hi"
},
"ignored_null": null,
"integer": 4,
"ignored_list": [3, 4],
"ignored_parent": {
"another_ignored_list": [4],
"another_ignored_null": null,
"ignored_string": "hello, world!"
}
}`
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const validJSONTags = `
{
"value": 15,
"role": "master",
"build": "123"
}`
var expectedFields = map[string]interface{}{
"parent_child": float64(3),
"integer": float64(4),
}
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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
}
// 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 genMockHttpJson(response string, statusCode int) []*HttpJson {
return []*HttpJson{
&HttpJson{
client: mockHTTPClient{responseBody: response, statusCode: statusCode},
Servers: []string{
"http://server1.example.com/metrics/",
"http://server2.example.com/metrics/",
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},
Name: "my_webapp",
Method: "GET",
Parameters: map[string]string{
"httpParam1": "12",
"httpParam2": "the second parameter",
},
},
&HttpJson{
client: mockHTTPClient{responseBody: response, statusCode: statusCode},
Servers: []string{
"http://server3.example.com/metrics/",
"http://server4.example.com/metrics/",
},
Name: "other_webapp",
Method: "POST",
Parameters: map[string]string{
"httpParam1": "12",
"httpParam2": "the second parameter",
},
TagKeys: []string{
"role",
"build",
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},
},
}
}
// Test that the proper values are ignored or collected
func TestHttpJson200(t *testing.T) {
httpjson := genMockHttpJson(validJSON, 200)
for _, service := range httpjson {
var acc testutil.Accumulator
err := service.Gather(&acc)
require.NoError(t, err)
assert.Equal(t, 4, acc.NFields())
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for _, srv := range service.Servers {
tags := map[string]string{"server": srv}
mname := "httpjson_" + service.Name
acc.AssertContainsTaggedFields(t, mname, expectedFields, tags)
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}
}
}
// Test response to HTTP 500
func TestHttpJson500(t *testing.T) {
httpjson := genMockHttpJson(validJSON, 500)
var acc testutil.Accumulator
err := httpjson[0].Gather(&acc)
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assert.NotNil(t, err)
assert.Equal(t, 0, acc.NFields())
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}
// Test response to HTTP 405
func TestHttpJsonBadMethod(t *testing.T) {
httpjson := genMockHttpJson(validJSON, 200)
httpjson[0].Method = "NOT_A_REAL_METHOD"
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var acc testutil.Accumulator
err := httpjson[0].Gather(&acc)
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assert.NotNil(t, err)
assert.Equal(t, 0, acc.NFields())
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}
// Test response to malformed JSON
func TestHttpJsonBadJson(t *testing.T) {
httpjson := genMockHttpJson(invalidJSON, 200)
var acc testutil.Accumulator
err := httpjson[0].Gather(&acc)
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assert.NotNil(t, err)
assert.Equal(t, 0, acc.NFields())
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}
// Test response to empty string as response objectgT
func TestHttpJsonEmptyResponse(t *testing.T) {
httpjson := genMockHttpJson(empty, 200)
var acc testutil.Accumulator
err := httpjson[0].Gather(&acc)
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assert.NotNil(t, err)
assert.Equal(t, 0, acc.NFields())
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}
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// Test that the proper values are ignored or collected
func TestHttpJson200Tags(t *testing.T) {
httpjson := genMockHttpJson(validJSONTags, 200)
for _, service := range httpjson {
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if service.Name == "other_webapp" {
var acc testutil.Accumulator
err := service.Gather(&acc)
require.NoError(t, err)
assert.Equal(t, 2, acc.NFields())
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for _, srv := range service.Servers {
tags := map[string]string{"server": srv, "role": "master", "build": "123"}
fields := map[string]interface{}{"value": float64(15)}
mname := "httpjson_" + service.Name
acc.AssertContainsTaggedFields(t, mname, fields, tags)
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}
}
}
}