Adding upstream version 3.2.6.upstream/3.2.6upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# Libknot API in Python
+
+A Python interface for managing the Knot DNS daemon.
+
+# Table of contents
+
+* [Introduction](#introduction)
+* [Control module](#control-module)
+  + [Usage](#using-the-control-module)
+  + [Example](#control-module-example)
+* [Probe module](#probe-module)
+  + [Usage](#using-the-probe-module)
+  + [Example](#probe-module-example)
+* [Dname module](#dname-module)
+  + [Usage](#using-the-dname-module)
+  + [Example](#dname-module-example)
+
+## Introduction
+
+If the shared `libknot.so` library isn't available in the library search path, it's
+necessary to load the library first, e.g.:
+
+```python3
+import libknot
+libknot.Knot("/usr/lib/libknot.so")
+```
+
+## Control module
+
+Using this module it's possible to create scripts for efficient tasks that
+would require complex shell scripts with multiple calls of `knotc`. For
+communication with the daemon it uses the same mechanism as the `knotc` utility,
+i.e. communication via a Unix socket.
+
+The module API is stored in `libknot.control`.
+
+### Using the Control module
+
+The module usage consists of several steps:
+
+* Initialization and connection to the daemon control socket.
+* One or more control operations. An operation is called by sending a command
+  with optional data to the daemon. The operation result has to be received
+  afterwards.
+* Closing the connection and deinitialization.
+
+### Control module example
+
+```python3
+import json
+import libknot.control
+
+# Initialization
+ctl = libknot.control.KnotCtl()
+ctl.connect("/var/run/knot/knot.sock")
+ctl.set_timeout(60)
+
+try:
+    # Operation without parameters
+    ctl.send_block(cmd="conf-begin")
+    resp = ctl.receive_block()
+
+    # Operation with parameters
+    ctl.send_block(cmd="conf-set", section="zone", item="domain", data="test")
+    resp = ctl.receive_block()
+
+    ctl.send_block(cmd="conf-commit")
+    resp = ctl.receive_block()
+
+    # Operation with a result displayed in JSON format
+    ctl.send_block(cmd="conf-read", section="zone", item="domain")
+    resp = ctl.receive_block()
+    print(json.dumps(resp, indent=4))
+except libknot.control.KnotCtlError as exc:
+    # Print libknot error
+    print(exc)
+finally:
+    # Deinitialization
+    ctl.send(libknot.control.KnotCtlType.END)
+    ctl.close()
+```
+
+```python3
+    # List configured zones (including catalog member ones)
+    ctl.send_block(cmd="conf-list", flags="z")
+    resp = ctl.receive_block()
+    for zone in resp['zone']:
+        print(zone)
+```
+
+## Probe module
+
+Using this module it's possible to receive traffic data from a running daemon with
+active probe module.
+
+The module API is stored in `libknot.probe`.
+
+### Using the Probe module
+
+The module usage consists of several steps:
+
+* Initialization of one or more probe channels
+* Periodical receiving of data units from the channels and data processing
+
+### Probe module example
+
+```python3
+import libknot.probe
+
+# Initialization of the first probe channel stored in `/run/knot`
+probe = libknot.probe.KnotProbe("/run/knot", 1)
+
+# Array for storing up to 8 data units
+data = libknot.probe.KnotProbeDataArray(8)
+while (True):
+    # Receiving data units with timeout of 1000 ms
+    if probe.consume(data, 1000) > 0:
+        # Printing received data units in the default format
+        for item in data:
+            print(item)
+```
+
+## Dname module
+
+This module provides a few dname-related operations.
+
+### Using the Dname module
+
+The dname object is initialized from a string with textual dname.
+Then the dname can be reformatted to wire format or back to textual format.
+
+### Dname module example
+
+```python3
+import libknot.dname
+
+dname = libknot.dname.KnotDname("e\\120ample.c\om.")
+print(dname.size()
+print(dname.str())
+print(dname.wire())
+```
+
+```bash
+13
+example.com.
+b'\x07example\x03com\x00'
+```