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/*
* Copyright © 2017-2019 AT&T, Bell Canada
*
* 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.
*/
package org.onap.ccsdk.apps.blueprintsprocessor.functions.netconf.executor.core
import org.onap.ccsdk.apps.blueprintsprocessor.functions.netconf.executor.api.DeviceInfo
import org.onap.ccsdk.apps.blueprintsprocessor.functions.netconf.executor.api.NetconfReceivedEvent
import org.onap.ccsdk.apps.blueprintsprocessor.functions.netconf.executor.api.NetconfSessionListener
import org.onap.ccsdk.apps.blueprintsprocessor.functions.netconf.executor.utils.NetconfMessageUtils
import org.onap.ccsdk.apps.blueprintsprocessor.functions.netconf.executor.utils.RpcMessageUtils
import org.slf4j.LoggerFactory
import java.io.BufferedReader
import java.io.IOException
import java.io.InputStream
import java.io.InputStreamReader
import java.io.OutputStream
import java.io.OutputStreamWriter
import java.nio.charset.StandardCharsets
import java.util.concurrent.CompletableFuture
class NetconfDeviceCommunicator(private var inputStream: InputStream,
private var out: OutputStream,
private val deviceInfo: DeviceInfo,
private val sessionListener: NetconfSessionListener,
private var replies: MutableMap<String, CompletableFuture<String>>) : Thread() {
private val log = LoggerFactory.getLogger(NetconfDeviceCommunicator::class.java)
private var state = NetconfMessageState.NO_MATCHING_PATTERN
init {
start()
}
override fun run() {
var bufferReader: BufferedReader? = null
while (bufferReader == null) {
bufferReader = BufferedReader(InputStreamReader(inputStream, StandardCharsets.UTF_8))
}
try {
var socketClosed = false
val deviceReplyBuilder = StringBuilder()
while (!socketClosed) {
val cInt = bufferReader.read()
if (cInt == -1) {
log.error("$deviceInfo: Received cInt = -1")
// bufferReader.close()
socketClosed = true
// sessionListener.notify(NetconfReceivedEvent(
// NetconfReceivedEvent.Type.SESSION_CLOSED,
// deviceInfo = deviceInfo))
}
val c = cInt.toChar()
state = state.evaluateChar(c)
deviceReplyBuilder.append(c)
if (state === NetconfMessageState.END_PATTERN) {
var deviceReply = deviceReplyBuilder.toString()
if (deviceReply == RpcMessageUtils.END_PATTERN) {
socketClosed = true
bufferReader.close()
sessionListener.notify(NetconfReceivedEvent(
NetconfReceivedEvent.Type.DEVICE_UNREGISTERED,
deviceInfo = deviceInfo))
} else {
deviceReply = deviceReply.replace(RpcMessageUtils.END_PATTERN, "")
receivedMessage(deviceReply)
deviceReplyBuilder.setLength(0)
}
} else if (state === NetconfMessageState.END_CHUNKED_PATTERN) {
var deviceReply = deviceReplyBuilder.toString()
if (!NetconfMessageUtils.validateChunkedFraming(deviceReply)) {
log.debug("$deviceInfo: Received badly framed message $deviceReply")
socketClosed = true
sessionListener.notify(NetconfReceivedEvent(
NetconfReceivedEvent.Type.DEVICE_ERROR,
deviceInfo = deviceInfo))
} else {
deviceReply = deviceReply.replace(RpcMessageUtils.MSGLEN_REGEX_PATTERN.toRegex(), "")
deviceReply = deviceReply.replace(NetconfMessageUtils.CHUNKED_END_REGEX_PATTERN.toRegex(), "")
receivedMessage(deviceReply)
deviceReplyBuilder.setLength(0)
}
}
}
} catch (e: IOException) {
log.warn("$deviceInfo: Fail while reading from channel", e)
sessionListener.notify(NetconfReceivedEvent(
NetconfReceivedEvent.Type.DEVICE_ERROR,
deviceInfo = deviceInfo))
}
}
private enum class NetconfMessageState {
NO_MATCHING_PATTERN {
override fun evaluateChar(c: Char): NetconfMessageState {
return if (c == ']') {
FIRST_BRACKET
} else if (c == '\n') {
FIRST_LF
} else {
this
}
}
},
FIRST_BRACKET {
override fun evaluateChar(c: Char): NetconfMessageState {
return if (c == ']') {
SECOND_BRACKET
} else {
NO_MATCHING_PATTERN
}
}
},
SECOND_BRACKET {
override fun evaluateChar(c: Char): NetconfMessageState {
return if (c == '>') {
FIRST_BIGGER
} else {
NO_MATCHING_PATTERN
}
}
},
FIRST_BIGGER {
override fun evaluateChar(c: Char): NetconfMessageState {
return if (c == ']') {
THIRD_BRACKET
} else {
NO_MATCHING_PATTERN
}
}
},
THIRD_BRACKET {
override fun evaluateChar(c: Char): NetconfMessageState {
return if (c == ']') {
ENDING_BIGGER
} else {
NO_MATCHING_PATTERN
}
}
},
ENDING_BIGGER {
override fun evaluateChar(c: Char): NetconfMessageState {
return if (c == '>') {
END_PATTERN
} else {
NO_MATCHING_PATTERN
}
}
},
FIRST_LF {
override fun evaluateChar(c: Char): NetconfMessageState {
return if (c == '#') {
FIRST_HASH
} else if (c == ']') {
FIRST_BRACKET
} else if (c == '\n') {
this
} else {
NO_MATCHING_PATTERN
}
}
},
FIRST_HASH {
override fun evaluateChar(c: Char): NetconfMessageState {
return if (c == '#') {
SECOND_HASH
} else {
NO_MATCHING_PATTERN
}
}
},
SECOND_HASH {
override fun evaluateChar(c: Char): NetconfMessageState {
return if (c == '\n') {
END_CHUNKED_PATTERN
} else {
NO_MATCHING_PATTERN
}
}
},
END_CHUNKED_PATTERN {
override fun evaluateChar(c: Char): NetconfMessageState {
return NO_MATCHING_PATTERN
}
},
END_PATTERN {
override fun evaluateChar(c: Char): NetconfMessageState {
return NO_MATCHING_PATTERN
}
};
internal abstract fun evaluateChar(c: Char): NetconfMessageState
}
fun sendMessage(request: String, messageId: String): CompletableFuture<String> {
log.info("$deviceInfo: Sending message: \n $request")
val future = CompletableFuture<String>()
replies.put(messageId, future)
val outputStream = OutputStreamWriter(out, StandardCharsets.UTF_8)
synchronized(this) {
try {
outputStream.write(request)
outputStream.flush()
} catch (e: IOException) {
log.error("$deviceInfo: Failed to send message : \n $request", e)
future.completeExceptionally(e)
}
}
return future
}
private fun receivedMessage(deviceReply: String) {
if (deviceReply.contains(RpcMessageUtils.RPC_REPLY) || deviceReply.contains(RpcMessageUtils.RPC_ERROR)
|| deviceReply.contains(RpcMessageUtils.HELLO)) {
log.info("$deviceInfo: Received message with messageId: {} \n $deviceReply",
NetconfMessageUtils.getMsgId(deviceReply))
} else {
log.error("$deviceInfo: Invalid message received: \n $deviceReply")
}
sessionListener.notify(NetconfReceivedEvent(
NetconfReceivedEvent.Type.DEVICE_REPLY,
deviceReply,
NetconfMessageUtils.getMsgId(deviceReply),
deviceInfo))
}
}
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