Cherry-pick #8485 to 6.x: Beatless initial PR (#8736)

Cherry-pick of PR #8485 to 6.x branch. Original message: 

## This PR provide the following

1. Plugin infra for developing providers and functions
2. A local stdin provider only used for testing, I will remove it in the
final version.
3. AWS provider and function types for:
  - Cloudwatch logs
  - SQS
  - Kinesis
  - Api web gateway proxy
4. License checker
5. Packaging of artifact
6. Runners
7. CLI infrastructure
8. CLI to push a cloudwatch logs function.
9. CLI to delete any function
10. Processors support.
11. Types to validate value from the users and the lambda function.

## What it doesn't provides

- ECS and full event extraction. (NOT for v1)
- Specifying the AWS credentials in the configuration
- CLI for SQS, Kinesis, API
- Robust CLI interaction with the API, rollback on failure / versioning.
- Removal of not supported outputs
- Removal of seccomp check
- Integration tests
- Updated build task to produce containing the user executable beat and
the linux beats.
- Concurrency / memory settings

## Vendored

- aws/aws-lambda-go
- aws/aws-sdk-go-v2

---

**Note:** The PR look much bigger because of the vendored files.

**Notes 2:** 

Make sure you add this to your config YAMl, I wan't to make the following the default options but it would have been really messy to do it in this PR.

```
# Disable anything that could be send to disk
path.data: /tmp
path.logs: /tmp/logs
logging.to_stderr: true
logging.to_files: false
#logging.level: debug
setup.template.enabled: true
queue.mem:
  events: 50
  flush.min_events: 1
  flush.timeout: 0.5s
```

## related work
- #8449
- #8443

.travis.yml

@@ -105,6 +105,17 @@ jobs:
       go: $GO_VERSION
       stage: test
 
+    # Functionbeat
+    - os: linux
+      env: TARGETS="-C x-pack/functionbeat testsuite"
+      go: $GO_VERSION
+      stage: test
+
+    - os: osx
+      env: TARGETS="TEST_ENVIRONMENT=0 -C x-pack/functionbeat testsuite"
+      go: $GO_VERSION
+      stage: test
+
     # Generators
     - os: linux
       env: TARGETS="-C generator/metricbeat test"

CHANGELOG.asciidoc

@@ -27,6 +27,8 @@ https://github.com/elastic/beats/compare/v6.4.0...6.x[Check the HEAD diff]
 
 *Winlogbeat*
 
+*Functionbeat*
+
 ==== Bugfixes
 
 *Affecting all Beats*
@@ -95,6 +97,7 @@ https://github.com/elastic/beats/compare/v6.4.0...6.x[Check the HEAD diff]
 
 *Winlogbeat*
 
+*Functionbeat*
 
 ==== Added
 
@@ -167,6 +170,10 @@ https://github.com/elastic/beats/compare/v6.4.0...6.x[Check the HEAD diff]
 
 - Add automatic config file reloading. {pull}8023[8023]
 
+*Functionbeat*
+
+- Initial version of Functionbeat. {pull}8678[8678]
+
 ==== Deprecated
 
 *Affecting all Beats*
@@ -188,6 +195,8 @@ https://github.com/elastic/beats/compare/v6.4.0...6.x[Check the HEAD diff]
 
 *Winlogbeat*
 
+*Functionbeat*
+
 ==== Known Issue
 
 

Makefile

@@ -1,6 +1,6 @@
 BUILD_DIR=$(CURDIR)/build
 COVERAGE_DIR=$(BUILD_DIR)/coverage
-BEATS?=auditbeat filebeat heartbeat journalbeat metricbeat packetbeat winlogbeat
+BEATS?=auditbeat filebeat heartbeat journalbeat metricbeat packetbeat winlogbeat x-pack/functionbeat
 PROJECTS=libbeat $(BEATS)
 PROJECTS_ENV=libbeat filebeat metricbeat
 PYTHON_ENV?=$(BUILD_DIR)/python-env
@@ -11,6 +11,7 @@ GOLINT_REPO=github.com/golang/lint/golint
 REVIEWDOG=reviewdog
 REVIEWDOG_OPTIONS?=-diff "git diff master"
 REVIEWDOG_REPO=github.com/haya14busa/reviewdog/cmd/reviewdog
+XPACK_SUFFIX=x-pack/
 
 # Runs complete testsuites (unit, system, integration) for all beats with coverage and race detection.
 # Also it builds the docs and the generators
@@ -152,7 +153,7 @@ release: beats-dashboards
 	@$(foreach var,$(BEATS),$(MAKE) -C $(var) release || exit 1;)
 	@$(foreach var,$(BEATS), \
       test -d $(var)/build/distributions && test -n "$$(ls $(var)/build/distributions)" || exit 0; \
-      mkdir -p build/distributions/$(var) && mv -f $(var)/build/distributions/* build/distributions/$(var)/ || exit 1;)
+      mkdir -p build/distributions/$(subst $(XPACK_SUFFIX),'',$(var)) && mv -f $(var)/build/distributions/* build/distributions/$(subst $(XPACK_SUFFIX),'',$(var))/ || exit 1;)
 
 # Builds a snapshot release. The Go version defined in .go-version will be
 # installed and used for the build.

NOTICE.txt

@@ -115,6 +115,66 @@ 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.
 
+--------------------------------------------------------------------
+Dependency: github.com/aws/aws-lambda-go
+Version: =v1.6.0
+Revision: 2d482ef09017ae953b1e8d5a6ddac5b696663a3c
+License type (autodetected): Apache-2.0
+./vendor/github.com/aws/aws-lambda-go/LICENSE:
+--------------------------------------------------------------------
+Apache License 2.0
+
+
+--------------------------------------------------------------------
+Dependency: github.com/aws/aws-lambda-go
+Version: =v1.6.0
+Revision: 2d482ef09017ae953b1e8d5a6ddac5b696663a3c
+License type (autodetected): MIT
+./vendor/github.com/aws/aws-lambda-go/LICENSE-LAMBDACODE:
+--------------------------------------------------------------------
+MIT No Attribution
+
+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.
+
+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.
+
+
+--------------------------------------------------------------------
+Dependency: github.com/aws/aws-sdk-go-v2
+Version: v2.0.0-preview.5
+Revision: d52522b5f4b95591ff6528d7c54923951aadf099
+License type (autodetected): Apache-2.0
+./vendor/github.com/aws/aws-sdk-go-v2/LICENSE.txt:
+--------------------------------------------------------------------
+Apache License 2.0
+
+-------NOTICE.txt-----
+AWS SDK for Go
+Copyright 2015 Amazon.com, Inc. or its affiliates. All Rights Reserved. 
+Copyright 2014-2015 Stripe, Inc.
+
+--------------------------------------------------------------------
+Dependency: github.com/awslabs/goformation
+Version: 1.2.2
+Revision: d42502ef32a8892bf380256e2f57c6f69190d802
+License type (autodetected): Apache-2.0
+./vendor/github.com/awslabs/goformation/LICENSE:
+--------------------------------------------------------------------
+Apache License 2.0
+
+-------NOTICE-----
+GoFormation
+Copyright 2011-2017 Amazon.com, Inc. or its affiliates. All Rights Reserved. 
+
 --------------------------------------------------------------------
 Dependency: github.com/bsm/sarama-cluster
 Revision: 7e67d87a6b3f83fe08c096fd084691bd9dca112f
@@ -723,6 +783,14 @@ THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+--------------------------------------------------------------------
+Dependency: github.com/go-ini/ini
+License type (autodetected): Apache-2.0
+./vendor/github.com/go-ini/ini/LICENSE:
+--------------------------------------------------------------------
+Apache License 2.0
+
+
 --------------------------------------------------------------------
 Dependency: github.com/go-ole/go-ole
 Revision: de8695c8edbf8236f30d6e1376e20b198a028d42
@@ -1377,6 +1445,41 @@ License type (autodetected): Apache-2.0
 Apache License 2.0
 
 
+--------------------------------------------------------------------
+Dependency: github.com/imdario/mergo
+Revision: 9f23e2d6bd2a77f959b2bf6acdbefd708a83a4a4
+License type (autodetected): BSD-3-Clause
+./vendor/github.com/imdario/mergo/LICENSE:
+--------------------------------------------------------------------
+Copyright (c) 2013 Dario Castañé. All rights reserved.
+Copyright (c) 2012 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 --------------------------------------------------------------------
 Dependency: github.com/inconshreveable/mousetrap
 Revision: 76626ae9c91c4f2a10f34cad8ce83ea42c93bb75
@@ -1422,6 +1525,16 @@ CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+--------------------------------------------------------------------
+Dependency: github.com/jmespath/go-jmespath
+Version: 0.2.2
+Revision: 3433f3ea46d9f8019119e7dd41274e112a2359a9
+License type (autodetected): Apache-2.0
+./vendor/github.com/jmespath/go-jmespath/LICENSE:
+--------------------------------------------------------------------
+Apache License 2.0
+
+
 --------------------------------------------------------------------
 Dependency: github.com/joeshaw/multierror
 Revision: 69b34d4ec901851247ae7e77d33909caf9df99ed
@@ -2138,6 +2251,112 @@ ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+--------------------------------------------------------------------
+Dependency: github.com/sanathkr/go-yaml
+Version: v2
+Revision: ed9d249f429b3f5a69f80a7abef6bfce81fef894
+License type (autodetected): Apache-2.0
+./vendor/github.com/sanathkr/go-yaml/LICENSE:
+--------------------------------------------------------------------
+Apache License 2.0
+
+
+--------------------------------------------------------------------
+Dependency: github.com/sanathkr/go-yaml
+Version: v2
+Revision: ed9d249f429b3f5a69f80a7abef6bfce81fef894
+License type (autodetected): MIT
+./vendor/github.com/sanathkr/go-yaml/LICENSE.libyaml:
+--------------------------------------------------------------------
+The following files were ported to Go from C files of libyaml, and thus
+are still covered by their original copyright and license:
+
+    apic.go
+    emitterc.go
+    parserc.go
+    readerc.go
+    scannerc.go
+    writerc.go
+    yamlh.go
+    yamlprivateh.go
+
+Copyright (c) 2006 Kirill Simonov
+
+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.
+
+--------------------------------------------------------------------
+Dependency: github.com/sanathkr/yaml
+Revision: 0056894fa522748ca336761ffeeeb6bbae654d07
+License type (autodetected): MIT
+./vendor/github.com/sanathkr/yaml/LICENSE:
+--------------------------------------------------------------------
+The MIT License (MIT)
+
+Copyright (c) 2014 Sam Ghods
+
+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.
+
+
+Copyright (c) 2012 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
 --------------------------------------------------------------------
 Dependency: github.com/shirou/gopsutil
 Version: v2.18.06

dev-tools/generate_notice.py

@@ -7,6 +7,7 @@
 import json
 import csv
 import re
+import pdb
 import copy
 
 
@@ -87,6 +88,8 @@ def gather_dependencies(vendor_dirs, overrides=None):
 
 # Allow to skip files that could match the `LICENSE` pattern but does not have any license information.
 SKIP_FILES = [
+    # AWS lambda go defines that some part of the code is APLv2 and other on a MIT Modified license.
+    "./vendor/github.com/aws/aws-lambda-go/LICENSE-SUMMARY"
 ]
 
 

dev-tools/mage/fields.go

@@ -18,6 +18,7 @@
 package mage
 
 import (
+	"os"
 	"path/filepath"
 
 	"github.com/magefile/mage/sh"
@@ -40,7 +41,11 @@ func OSSBeatDir(path ...string) string {
 
 	// Check if we need to correct ossDir because it's in x-pack.
 	if parentDir := filepath.Base(filepath.Dir(ossDir)); parentDir == "x-pack" {
-		ossDir = filepath.Join(ossDir, "../..", BeatName)
+		// If the OSS version of the beat exists.
+		tmp := filepath.Join(ossDir, "../..", BeatName)
+		if _, err := os.Stat(tmp); !os.IsNotExist(err) {
+			ossDir = tmp
+		}
 	}
 
 	return filepath.Join(append([]string{ossDir}, path...)...)