Implement api request logging to Redis Streams.

This makes it possible for external services to subscribe (through
Redis) for realtime events. E.g. a create, update or delete device event
could trigger an external synchronization.

api/python/Makefile

@@ -37,6 +37,7 @@ api:
 	$(PROTOC) ${PROTOC_ARGS} chirpstack-api/api/gateway.proto
 	$(PROTOC) ${PROTOC_ARGS} chirpstack-api/api/frame_log.proto
 	$(PROTOC) ${PROTOC_ARGS} chirpstack-api/api/multicast_group.proto
+	$(PROTOC) ${PROTOC_ARGS} chirpstack-api/api/request_log.proto
 
 integration:
 	$(PROTOC) ${PROTOC_ARGS} chirpstack-api/integration/integration.proto

api/python/proto/chirpstack-api/api/request_log.proto

@@ -0,0 +1,23 @@
+syntax = "proto3";
+
+package api;
+
+option go_package = "github.com/chirpstack/chirpstack/api/go/v4/api";
+option java_package = "io.chirpstack.api";
+option java_multiple_files = true;
+option java_outer_classname = "RequestLog";
+
+import "google/protobuf/timestamp.proto";
+import "chirpstack-api/common/common.proto";
+import "chirpstack-api/gw/gw.proto";
+
+message RequestLog {
+    // API service name.
+    string service = 1;
+
+    // API method name.
+    string method = 2;
+
+    // Metadata.
+    map<string, string> metadata = 3;
+}

api/python/src/chirpstack_api/api/__init__.py

@@ -18,3 +18,4 @@ from .tenant_pb2 import *
 from .tenant_pb2_grpc import *
 from .user_pb2 import *
 from .user_pb2_grpc import *
+from .request_log_pb2 import *

api/python/src/chirpstack_api/api/request_log_pb2.py

@@ -0,0 +1,33 @@
+# -*- coding: utf-8 -*-
+# Generated by the protocol buffer compiler.  DO NOT EDIT!
+# source: chirpstack-api/api/request_log.proto
+"""Generated protocol buffer code."""
+from google.protobuf.internal import builder as _builder
+from google.protobuf import descriptor as _descriptor
+from google.protobuf import descriptor_pool as _descriptor_pool
+from google.protobuf import symbol_database as _symbol_database
+# @@protoc_insertion_point(imports)
+
+_sym_db = _symbol_database.Default()
+
+
+from google.protobuf import timestamp_pb2 as google_dot_protobuf_dot_timestamp__pb2
+from chirpstack_api.common import common_pb2 as chirpstack__api_dot_common_dot_common__pb2
+from chirpstack_api.gw import gw_pb2 as chirpstack__api_dot_gw_dot_gw__pb2
+
+
+DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n$chirpstack-api/api/request_log.proto\x12\x03\x61pi\x1a\x1fgoogle/protobuf/timestamp.proto\x1a\"chirpstack-api/common/common.proto\x1a\x1a\x63hirpstack-api/gw/gw.proto\"\x8f\x01\n\nRequestLog\x12\x0f\n\x07service\x18\x01 \x01(\t\x12\x0e\n\x06method\x18\x02 \x01(\t\x12/\n\x08metadata\x18\x03 \x03(\x0b\x32\x1d.api.RequestLog.MetadataEntry\x1a/\n\rMetadataEntry\x12\x0b\n\x03key\x18\x01 \x01(\t\x12\r\n\x05value\x18\x02 \x01(\t:\x02\x38\x01\x42Q\n\x11io.chirpstack.apiB\nRequestLogP\x01Z.github.com/chirpstack/chirpstack/api/go/v4/apib\x06proto3')
+
+_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals())
+_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'chirpstack_api.api.request_log_pb2', globals())
+if _descriptor._USE_C_DESCRIPTORS == False:
+
+  DESCRIPTOR._options = None
+  DESCRIPTOR._serialized_options = b'\n\021io.chirpstack.apiB\nRequestLogP\001Z.github.com/chirpstack/chirpstack/api/go/v4/api'
+  _REQUESTLOG_METADATAENTRY._options = None
+  _REQUESTLOG_METADATAENTRY._serialized_options = b'8\001'
+  _REQUESTLOG._serialized_start=143
+  _REQUESTLOG._serialized_end=286
+  _REQUESTLOG_METADATAENTRY._serialized_start=239
+  _REQUESTLOG_METADATAENTRY._serialized_end=286
+# @@protoc_insertion_point(module_scope)

api/python/src/chirpstack_api/api/request_log_pb2_grpc.py

@@ -0,0 +1,4 @@
+# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT!
+"""Client and server classes corresponding to protobuf-defined services."""
+import grpc
+