modularized all source code (#4391)

* modularized all external plugins

* added README.md in plugins

* fixed title

* fixed typo

* relative link to external plugins

* external plugins configuration README

* added plugins link

* remove plugins link

* plugin names are links

* added links to external plugins

* removed unecessary spacing

* list to table

* added language

* fixed typo

* list to table on internal plugins

* added more documentation to internal plugins

* moved python, node, and bash code and configs into the external plugins

* added statsd README

* fix bug with corrupting config.h every 2nd compilation

* moved all config files together with their code

* more documentation

* diskspace info

* fixed broken links in apps.plugin

* added backends docs

* updated plugins readme

* move nc-backend.sh to backends

* created daemon directory

* moved all code outside src/

* fixed readme identation

* renamed plugins.d.plugin to plugins.d

* updated readme

* removed linux- from linux plugins

* updated readme

* updated readme

* updated readme

* updated readme

* updated readme

* updated readme

* fixed README.md links

* fixed netdata tree links

* updated codacy, codeclimate and lgtm excluded paths

* update CMakeLists.txt

* updated automake options at top directory

* libnetdata slit into directories

* updated READMEs

* updated READMEs

* updated ARL docs

* updated ARL docs

* moved /plugins to /collectors

* moved all external plugins outside plugins.d

* updated codacy, codeclimate, lgtm

* updated README

* updated url

* updated readme

* updated readme

* updated readme

* updated readme

* moved api and web into webserver

* web/api web/gui web/server

* modularized webserver

* removed web/gui/version.txt

3 files changed, 258 insertions, 0 deletions

diff --git a/collectors/python.d.plugin/samba/README.md b/collectors/python.d.plugin/samba/README.md
new file mode 100644
index 0000000000..47a5551c06
--- /dev/null
+++ b/collectors/python.d.plugin/samba/README.md
@@ -0,0 +1,61 @@
+# samba
+
+Performance metrics of Samba file sharing.
+
+It produces the following charts:
+
+1. **Syscall R/Ws** in kilobytes/s
+ * sendfile
+ * recvfle
+
+2. **Smb2 R/Ws** in kilobytes/s
+ * readout
+ * writein
+ * readin
+ * writeout
+
+3. **Smb2 Create/Close** in operations/s
+ * create
+ * close
+
+4. **Smb2 Info** in operations/s
+ * getinfo
+ * setinfo
+
+5. **Smb2 Find** in operations/s
+ * find
+
+6. **Smb2 Notify** in operations/s
+ * notify
+
+7. **Smb2 Lesser Ops** as counters
+ * tcon
+ * negprot
+ * tdis
+ * cancel
+ * logoff
+ * flush
+ * lock
+ * keepalive
+ * break
+ * sessetup
+
+### configuration
+
+Requires that smbd has been compiled with profiling enabled.  Also required
+that `smbd` was started either with the `-P 1` option or inside `smb.conf`
+using `smbd profiling level`.
+
+This plugin uses `smbstatus -P` which can only be executed by root.  It uses
+sudo and assumes that it is configured such that the `netdata` user can
+execute smbstatus as root without password.
+
+For example:
+
+    netdata ALL=(ALL)       NOPASSWD: /usr/bin/smbstatus -P
+
+```yaml
+update_every : 5 # update frequency
+```
+
+---
diff --git a/collectors/python.d.plugin/samba/samba.chart.py b/collectors/python.d.plugin/samba/samba.chart.py
new file mode 100644
index 0000000000..27c1c72ecc
--- /dev/null
+++ b/collectors/python.d.plugin/samba/samba.chart.py
@@ -0,0 +1,135 @@
+# -*- coding: utf-8 -*-
+# Description:  samba netdata python.d module
+# Author: Christopher Cox <chris_cox@endlessnow.com>
+# SPDX-License-Identifier: GPL-3.0-or-later
+#
+# The netdata user needs to be able to be able to sudo the smbstatus program
+# without password:
+# netdata ALL=(ALL)       NOPASSWD: /usr/bin/smbstatus -P
+#
+# This makes calls to smbstatus -P
+#
+# This just looks at a couple of values out of syscall, and some from smb2.
+#
+# The Lesser Ops chart is merely a display of current counter values.  They
+# didn't seem to change much to me.  However, if you notice something changing
+# a lot there, bring one or more out into its own chart and make it incremental
+# (like find and notify... good examples).
+
+import re
+
+from bases.collection import find_binary
+from bases.FrameworkServices.ExecutableService import ExecutableService
+
+# default module values (can be overridden per job in `config`)
+update_every = 5
+priority = 60000
+retries = 60
+
+ORDER = [
+    'syscall_rw',
+    'smb2_rw',
+    'smb2_create_close',
+    'smb2_info',
+    'smb2_find',
+    'smb2_notify',
+    'smb2_sm_count'
+]
+
+CHARTS = {
+    'syscall_rw': {
+        'options': [None, 'R/Ws', 'kilobytes/s', 'syscall', 'syscall.rw', 'area'],
+        'lines': [
+            ['syscall_sendfile_bytes', 'sendfile', 'incremental', 1, 1024],
+            ['syscall_recvfile_bytes', 'recvfile', 'incremental', -1, 1024]
+        ]
+    },
+    'smb2_rw': {
+        'options': [None, 'R/Ws', 'kilobytes/s', 'smb2', 'smb2.rw', 'area'],
+        'lines': [
+            ['smb2_read_outbytes', 'readout', 'incremental', 1, 1024],
+            ['smb2_write_inbytes', 'writein', 'incremental', -1, 1024],
+            ['smb2_read_inbytes', 'readin', 'incremental', 1, 1024],
+            ['smb2_write_outbytes', 'writeout', 'incremental', -1, 1024]
+        ]
+    },
+    'smb2_create_close': {
+        'options': [None, 'Create/Close', 'operations/s', 'smb2', 'smb2.create_close', 'line'],
+        'lines': [
+            ['smb2_create_count', 'create', 'incremental', 1, 1],
+            ['smb2_close_count', 'close', 'incremental', -1, 1]
+        ]
+    },
+    'smb2_info': {
+        'options': [None, 'Info', 'operations/s', 'smb2', 'smb2.get_set_info', 'line'],
+        'lines': [
+            ['smb2_getinfo_count', 'getinfo', 'incremental', 1, 1],
+            ['smb2_setinfo_count', 'setinfo', 'incremental', -1, 1]
+        ]
+    },
+    'smb2_find': {
+        'options': [None, 'Find', 'operations/s', 'smb2', 'smb2.find', 'line'],
+        'lines': [
+            ['smb2_find_count', 'find', 'incremental', 1, 1]
+        ]
+    },
+    'smb2_notify': {
+        'options': [None, 'Notify', 'operations/s', 'smb2', 'smb2.notify', 'line'],
+        'lines': [
+            ['smb2_notify_count', 'notify', 'incremental', 1, 1]
+        ]
+    },
+    'smb2_sm_count': {
+        'options': [None, 'Lesser Ops', 'count', 'smb2', 'smb2.sm_counters', 'stacked'],
+        'lines': [
+            ['smb2_tcon_count', 'tcon', 'absolute', 1, 1],
+            ['smb2_negprot_count', 'negprot', 'absolute', 1, 1],
+            ['smb2_tdis_count', 'tdis', 'absolute', 1, 1],
+            ['smb2_cancel_count', 'cancel', 'absolute', 1, 1],
+            ['smb2_logoff_count', 'logoff', 'absolute', 1, 1],
+            ['smb2_flush_count', 'flush', 'absolute', 1, 1],
+            ['smb2_lock_count', 'lock', 'absolute', 1, 1],
+            ['smb2_keepalive_count', 'keepalive', 'absolute', 1, 1],
+            ['smb2_break_count', 'break', 'absolute', 1, 1],
+            ['smb2_sessetup_count', 'sessetup', 'absolute', 1, 1]
+        ]
+    }
+}
+
+
+class Service(ExecutableService):
+    def __init__(self, configuration=None, name=None):
+        ExecutableService.__init__(self, configuration=configuration, name=name)
+        self.order = ORDER
+        self.definitions = CHARTS
+        self.rgx_smb2 = re.compile(r'(smb2_[^:]+|syscall_.*file_bytes):\s+(\d+)')
+
+    def check(self):
+        sudo_binary, smbstatus_binary = find_binary('sudo'), find_binary('smbstatus')
+
+        if not (sudo_binary and smbstatus_binary):
+            self.error("Can\'t locate 'sudo' or 'smbstatus' binary")
+            return False
+
+        self.command = [sudo_binary, '-v']
+        err = self._get_raw_data(stderr=True)
+        if err:
+            self.error(''.join(err))
+            return False
+
+        self.command = ' '.join([sudo_binary, '-n', smbstatus_binary, '-P'])
+
+        return ExecutableService.check(self)
+
+    def _get_data(self):
+        """
+        Format data received from shell command
+        :return: dict
+        """
+        raw_data = self._get_raw_data()
+        if not raw_data:
+            return None
+
+        parsed = self.rgx_smb2.findall(' '.join(raw_data))
+
+        return dict(parsed) or None
diff --git a/collectors/python.d.plugin/samba/samba.conf b/collectors/python.d.plugin/samba/samba.conf
new file mode 100644
index 0000000000..ee513c60f9
--- /dev/null
+++ b/collectors/python.d.plugin/samba/samba.conf
@@ -0,0 +1,62 @@
+# netdata python.d.plugin configuration for samba
+#
+# This file is in YaML format. Generally the format is:
+#
+# name: value
+#
+# There are 2 sections:
+#  - global variables
+#  - one or more JOBS
+#
+# JOBS allow you to collect values from multiple sources.
+# Each source will have its own set of charts.
+#
+# JOB parameters have to be indented (using spaces only, example below).
+
+# ----------------------------------------------------------------------
+# Global Variables
+# These variables set the defaults for all JOBs, however each JOB
+# may define its own, overriding the defaults.
+
+# update_every sets the default data collection frequency.
+# If unset, the python.d.plugin default is used.
+update_every: 5
+
+# priority controls the order of charts at the netdata dashboard.
+# Lower numbers move the charts towards the top of the page.
+# If unset, the default for python.d.plugin is used.
+# priority: 60000
+
+# retries sets the number of retries to be made in case of failures.
+# If unset, the default for python.d.plugin is used.
+# Attempts to restore the service are made once every update_every
+# and only if the module has collected values in the past.
+# retries: 60
+
+# autodetection_retry sets the job re-check interval in seconds.
+# The job is not deleted if check fails.
+# Attempts to start the job are made once every autodetection_retry.
+# This feature is disabled by default.
+# autodetection_retry: 0
+
+# ----------------------------------------------------------------------
+# JOBS (data collection sources)
+#
+# The default JOBS share the same *name*. JOBS with the same name
+# are mutually exclusive. Only one of them will be allowed running at
+# any time. This allows autodetection to try several alternatives and
+# pick the one that works.
+#
+# Any number of jobs is supported.
+#
+# All python.d.plugin JOBS (for all its modules) support a set of
+# predefined parameters. These are:
+#
+# job_name:
+#     name: myname            # the JOB's name as it will appear at the
+#                             # dashboard (by default is the job_name)
+#                             # JOBs sharing a name are mutually exclusive
+#     update_every: 1         # the JOB's data collection frequency
+#     priority: 60000         # the JOB's order on the dashboard
+#     retries: 60             # the JOB's number of restoration attempts
+#     autodetection_retry: 0  # the JOB's re-check interval in seconds
\ No newline at end of file