1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
|
/*-
* ============LICENSE_START=======================================================
* Copyright (C) 2019 Nordix Foundation.
* ================================================================================
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* SPDX-License-Identifier: Apache-2.0
* ============LICENSE_END=========================================================
*/
package org.onap.dcaegen2.services.pmmapper.datarouter;
import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import com.google.gson.JsonParseException;
import io.undertow.util.HeaderValues;
import lombok.Data;
import lombok.NonNull;
import org.onap.dcaegen2.services.pmmapper.exceptions.NoMetadataException;
import org.onap.dcaegen2.services.pmmapper.model.EventMetadata;
import org.onap.dcaegen2.services.pmmapper.model.Event;
import io.undertow.server.HttpHandler;
import io.undertow.server.HttpServerExchange;
import io.undertow.util.StatusCodes;
import org.onap.dcaegen2.services.pmmapper.model.ServerHandler;
import org.onap.dcaegen2.services.pmmapper.utils.HttpServerExchangeAdapter;
import org.onap.dcaegen2.services.pmmapper.utils.RequiredFieldDeserializer;
import org.onap.logging.ref.slf4j.ONAPLogAdapter;
import org.slf4j.LoggerFactory;
import org.slf4j.MDC;
import java.util.Map;
import java.util.Optional;
/**
* Provides an undertow HttpHandler to be used as an endpoint for data router to send events to.
*/
@Data
public class DeliveryHandler implements HttpHandler, ServerHandler {
public static final String METADATA_HEADER = "X-DMAAP-DR-META";
public static final String PUB_ID_HEADER = "X-DMAAP-DR-PUBLISH-ID";
private static final ONAPLogAdapter logger = new ONAPLogAdapter(LoggerFactory.getLogger(DeliveryHandler.class));
private static final String BAD_METADATA_MESSAGE = "Malformed Metadata.";
private static final String NO_METADATA_MESSAGE = "Missing Metadata.";
private static final String METHOD = "put";
private static final String ENDPOINT_TEMPLATE = "/delivery/{filename}";
private Gson metadataBuilder;
@NonNull
private EventReceiver eventReceiver;
/**
* @param eventReceiver receiver for any inbound events.
*/
public DeliveryHandler(EventReceiver eventReceiver) {
this.eventReceiver = eventReceiver;
this.metadataBuilder = new GsonBuilder()
.registerTypeAdapter(EventMetadata.class, new RequiredFieldDeserializer<EventMetadata>())
.create();
}
private EventMetadata getMetadata(HttpServerExchange httpServerExchange) throws NoMetadataException {
String metadata = Optional.ofNullable(httpServerExchange.getRequestHeaders()
.get(METADATA_HEADER))
.map((HeaderValues headerValues) -> headerValues.get(0))
.orElseThrow(() -> new NoMetadataException("Metadata Not found"));
return metadataBuilder.fromJson(metadata, EventMetadata.class);
}
/**
* Receives inbound requests, verifies that required headers are valid
* and passes an Event onto the eventReceiver.
* The forwarded httpServerExchange response is the responsibility of the eventReceiver.
*
* @param httpServerExchange inbound http server exchange.
*/
@Override
public void handleRequest(HttpServerExchange httpServerExchange) {
try{
logger.entering(new HttpServerExchangeAdapter(httpServerExchange));
try {
Map<String,String> mdc = MDC.getCopyOfContextMap();
EventMetadata metadata = getMetadata(httpServerExchange);
String publishIdentity = httpServerExchange.getRequestHeaders().get(PUB_ID_HEADER).getFirst();
httpServerExchange.getRequestReceiver()
.receiveFullString((callbackExchange, body) ->
httpServerExchange.dispatch(() ->
eventReceiver.receive(new Event(
callbackExchange, body, metadata, mdc, publishIdentity)))
);
} catch (NoMetadataException exception) {
logger.unwrap().info("Bad Request: no metadata found under '{}' header.", METADATA_HEADER, exception);
httpServerExchange.setStatusCode(StatusCodes.BAD_REQUEST)
.getResponseSender()
.send(NO_METADATA_MESSAGE);
} catch (JsonParseException exception) {
logger.unwrap().info("Bad Request: Failure to parse metadata", exception);
httpServerExchange.setStatusCode(StatusCodes.BAD_REQUEST)
.getResponseSender()
.send(BAD_METADATA_MESSAGE);
}
} finally {
logger.exiting();
}
}
@Override
public String getMethod() {
return METHOD;
}
@Override
public String getTemplate() {
return ENDPOINT_TEMPLATE;
}
@Override
public HttpHandler getHandler() {
return this;
}
}
|
