[Filebeat][httpjson] Convert httpjson input to a v2 input (#20226)

* Convert httpjson input to a v2 cursor input

* Add CHANGELOG entry

* Fix format errors

* Convert to stateless input and refactor:
- Paginator takes care of requesting next page info
- Rate limiter takes care of rate limiting requests
- Date cursor takes care of keeping track of cursor state

* Remove python tests

* Do not fail if there is no next page

* Refactor go integration tests to work with v2 input

* Do suggested changes to input and tests

* Update time.Periodic call with error return

* Change test duration values

* Sepparate sync test case

* Create custon url config type

* Change input.Run comment

* Change input.Run to only return on context cancellation

* Remove all usages of pkg/errors

CHANGELOG.next.asciidoc

@@ -534,7 +534,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Add event.ingested to all Filebeat modules. {pull}20386[20386]
 - Return error when log harvester tries to open a named pipe. {issue}18682[18682] {pull}20450[20450]
 - Avoid goroutine leaks in Filebeat readers. {issue}19193[19193] {pull}20455[20455]
-
+- Convert httpjson to v2 input {pull}20226[20226]
 
 *Heartbeat*
 

x-pack/filebeat/input/default-inputs/inputs.go

@@ -12,6 +12,7 @@ import (
 	"github.com/elastic/beats/v7/libbeat/logp"
 	"github.com/elastic/beats/v7/x-pack/filebeat/input/cloudfoundry"
 	"github.com/elastic/beats/v7/x-pack/filebeat/input/http_endpoint"
+	"github.com/elastic/beats/v7/x-pack/filebeat/input/httpjson"
 	"github.com/elastic/beats/v7/x-pack/filebeat/input/o365audit"
 )
 
@@ -26,6 +27,7 @@ func xpackInputs(info beat.Info, log *logp.Logger, store beater.StateStore) []v2
 	return []v2.Plugin{
 		cloudfoundry.Plugin(),
 		http_endpoint.Plugin(),
+		httpjson.Plugin(),
 		o365audit.Plugin(log, store),
 	}
 }

x-pack/filebeat/input/httpjson/config.go

@@ -5,13 +5,14 @@
 package httpjson
 
 import (
+	"errors"
+	"fmt"
+	"net/url"
 	"regexp"
 	"strings"
 	"text/template"
 	"time"
 
-	"github.com/pkg/errors"
-
 	"github.com/elastic/beats/v7/libbeat/common"
 	"github.com/elastic/beats/v7/libbeat/common/transport/tlscommon"
 )
@@ -35,7 +36,7 @@ type config struct {
 	RetryWaitMin         time.Duration     `config:"retry.wait_min"`
 	RetryWaitMax         time.Duration     `config:"retry.wait_max"`
 	TLS                  *tlscommon.Config `config:"ssl"`
-	URL                  string            `config:"url" validate:"required"`
+	URL                  *URL              `config:"url" validate:"required"`
 	DateCursor           *DateCursor       `config:"date_cursor"`
 }
 
@@ -92,6 +93,21 @@ func (t *Template) Unpack(in string) error {
 	return nil
 }
 
+type URL struct {
+	*url.URL
+}
+
+func (u *URL) Unpack(in string) error {
+	parsed, err := url.Parse(in)
+	if err != nil {
+		return err
+	}
+
+	*u = URL{URL: parsed}
+
+	return nil
+}
+
 // IsEnabled returns true if the `enable` field is set to true in the yaml.
 func (dc *DateCursor) IsEnabled() bool {
 	return dc != nil && (dc.Enabled == nil || *dc.Enabled)
@@ -121,26 +137,26 @@ func (c *config) Validate() error {
 	case "GET", "POST":
 		break
 	default:
-		return errors.Errorf("httpjson input: Invalid http_method, %s", c.HTTPMethod)
+		return fmt.Errorf("httpjson input: Invalid http_method, %s", c.HTTPMethod)
 	}
 	if c.NoHTTPBody {
 		if len(c.HTTPRequestBody) > 0 {
-			return errors.Errorf("invalid configuration: both no_http_body and http_request_body cannot be set simultaneously")
+			return errors.New("invalid configuration: both no_http_body and http_request_body cannot be set simultaneously")
 		}
 		if c.Pagination != nil && (len(c.Pagination.ExtraBodyContent) > 0 || c.Pagination.RequestField != "") {
-			return errors.Errorf("invalid configuration: both no_http_body and pagination.extra_body_content or pagination.req_field cannot be set simultaneously")
+			return errors.New("invalid configuration: both no_http_body and pagination.extra_body_content or pagination.req_field cannot be set simultaneously")
 		}
 	}
 	if c.Pagination != nil {
 		if c.Pagination.Header != nil {
 			if c.Pagination.RequestField != "" || c.Pagination.IDField != "" || len(c.Pagination.ExtraBodyContent) > 0 {
-				return errors.Errorf("invalid configuration: both pagination.header and pagination.req_field or pagination.id_field or pagination.extra_body_content cannot be set simultaneously")
+				return errors.New("invalid configuration: both pagination.header and pagination.req_field or pagination.id_field or pagination.extra_body_content cannot be set simultaneously")
 			}
 		}
 	}
 	if c.OAuth2.IsEnabled() {
 		if c.APIKey != "" || c.AuthenticationScheme != "" {
-			return errors.Errorf("invalid configuration: oauth2 and api_key or authentication_scheme cannot be set simultaneously")
+			return errors.New("invalid configuration: oauth2 and api_key or authentication_scheme cannot be set simultaneously")
 		}
 	}
 	return nil

x-pack/filebeat/input/httpjson/config_oauth.go

@@ -7,13 +7,13 @@ package httpjson
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io/ioutil"
 	"net/http"
 	"os"
 	"strings"
 
-	"github.com/pkg/errors"
 	"golang.org/x/oauth2"
 	"golang.org/x/oauth2/clientcredentials"
 	"golang.org/x/oauth2/endpoints"

x-pack/filebeat/input/httpjson/config_test.go

@@ -6,11 +6,12 @@ package httpjson
 
 import (
 	"context"
+	"errors"
 	"os"
 	"testing"
 	"time"
 
-	"github.com/pkg/errors"
+	"github.com/stretchr/testify/assert"
 	"golang.org/x/oauth2/google"
 
 	"github.com/elastic/beats/v7/libbeat/common"
@@ -110,6 +111,16 @@ func TestConfigValidationCase7(t *testing.T) {
 	}
 }
 
+func TestConfigMustFailWithInvalidURL(t *testing.T) {
+	m := map[string]interface{}{
+		"url": "::invalid::",
+	}
+	cfg := common.MustNewConfigFrom(m)
+	conf := defaultConfig()
+	err := cfg.Unpack(&conf)
+	assert.EqualError(t, err, `parse "::invalid::": missing protocol scheme accessing 'url'`)
+}
+
 func TestConfigOauth2Validation(t *testing.T) {
 	cases := []struct {
 		name        string

x-pack/filebeat/input/httpjson/date_cursor.go

@@ -0,0 +1,105 @@
+// Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+// or more contributor license agreements. Licensed under the Elastic License;
+// you may not use this file except in compliance with the Elastic License.
+
+package httpjson
+
+import (
+	"bytes"
+	"net/url"
+	"time"
+
+	"github.com/elastic/beats/v7/libbeat/common"
+	"github.com/elastic/beats/v7/libbeat/logp"
+)
+
+type dateCursor struct {
+	log             *logp.Logger
+	enabled         bool
+	field           string
+	url             url.URL
+	urlField        string
+	initialInterval time.Duration
+	dateFormat      string
+
+	value    string
+	valueTpl *Template
+}
+
+func newDateCursorFromConfig(config config, log *logp.Logger) *dateCursor {
+	c := &dateCursor{
+		enabled: config.DateCursor.IsEnabled(),
+		url:     *config.URL.URL,
+	}
+
+	if !c.enabled {
+		return c
+	}
+
+	c.log = log
+	c.field = config.DateCursor.Field
+	c.urlField = config.DateCursor.URLField
+	c.initialInterval = config.DateCursor.InitialInterval
+	c.dateFormat = config.DateCursor.GetDateFormat()
+	c.valueTpl = config.DateCursor.ValueTemplate
+
+	return c
+}
+
+func (c *dateCursor) getURL() string {
+	if !c.enabled {
+		return c.url.String()
+	}
+
+	var dateStr string
+	if c.value == "" {
+		t := timeNow().UTC().Add(-c.initialInterval)
+		dateStr = t.Format(c.dateFormat)
+	} else {
+		dateStr = c.value
+	}
+
+	q := c.url.Query()
+
+	var value string
+	if c.valueTpl == nil {
+		value = dateStr
+	} else {
+		buf := new(bytes.Buffer)
+		if err := c.valueTpl.Template.Execute(buf, dateStr); err != nil {
+			return c.url.String()
+		}
+		value = buf.String()
+	}
+
+	q.Set(c.urlField, value)
+
+	c.url.RawQuery = q.Encode()
+
+	return c.url.String()
+}
+
+func (c *dateCursor) advance(m common.MapStr) {
+	if c.field == "" {
+		c.value = time.Now().UTC().Format(c.dateFormat)
+		return
+	}
+
+	v, err := m.GetValue(c.field)
+	if err != nil {
+		c.log.Warnf("date_cursor field: %q", err)
+		return
+	}
+	switch t := v.(type) {
+	case string:
+		_, err := time.Parse(c.dateFormat, t)
+		if err != nil {
+			c.log.Warn("date_cursor field does not have the expected layout")
+			return
+		}
+		c.value = t
+	default:
+		c.log.Warn("date_cursor field must be a string, cursor will not advance")
+		return
+	}
+}