com.telenordigital.sms.smpp.SmppConnectionGroup Maven / Gradle / Ivy

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A smpp client library implementing SMPP specification from https://smpp.org.
There is a newer version: 1.18
package com.telenordigital.sms.smpp;

/*-
 * #%L
 * sms-smpp
 * %%
 * Copyright (C) 2022 Telenor Digital
 * %%
 * 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.
 * #L%
 */

import com.telenordigital.sms.smpp.config.SmppConnectionConfig;
import com.telenordigital.sms.smpp.pdu.SubmitSm;
import com.telenordigital.sms.smpp.pdu.SubmitSmResp;
import java.io.Closeable;
import java.lang.invoke.MethodHandles;
import java.time.Clock;
import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.CompletableFuture;
import java.util.function.Function;
import java.util.function.Supplier;
import java.util.stream.Collectors;
import java.util.stream.IntStream;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class SmppConnectionGroup implements Closeable {
  private static final Logger LOG = LoggerFactory.getLogger(MethodHandles.lookup().lookupClass());

  private final List connections;
  private final Clock clock;
  private final String name;

  public SmppConnectionGroup(
      final Clock clock,
      final String name,
      final List config,
      final Function> smsDrHandler,
      final Function> smsMoHandler) {
    this.name = name;
    connections =
        config.stream()
            .flatMap(
                conn ->
                    IntStream.range(0, conn.numberOfBinds())
                        .mapToObj(i -> new SmppConnection(conn, smsMoHandler, smsDrHandler)))
            .toList();
    this.clock = clock;
  }

  public Map> connectionsWithOpenWindowSlots() {
    return IntStream.range(0, connections.size())
        .boxed()
        .collect(
            Collectors.toMap(
                i -> String.format("%s-%d", this.name, i),
                i -> () -> connections.get(i).getOpenWindowSlots()));
  }

  public CompletableFuture submit(final SmppSmsMt sms) {
    return trySubmit(sms)
        .thenCompose(
            r -> {
              if (r.result() == SmppResultCode.RETRIABLE_ERROR) {
                LOG.info("SubmitSm failed with a retriable error. Retrying once: {}", r);
                return trySubmit(sms);
              }
              return CompletableFuture.completedFuture(r);
            });
  }

  private CompletableFuture trySubmit(final SmppSmsMt sms) {
    final var activeConnections = connections.stream().filter(SmppConnection::isActive).toList();
    // connections with more free slots first
    return activeConnections.stream()
        .max(Comparator.comparing(SmppConnection::getOpenWindowSlots))
        .map(conn -> submitInternal(conn, sms))
        .orElseGet(
            () ->
                CompletableFuture.completedFuture(
                    SmppResponse.routeDown("No active connections", info())));
  }

  private CompletableFuture submitInternal(
      final SmppConnection conn, final SmppSmsMt sms) {
    final var details = info() + ". " + conn.info();

    return conn.submit(
            SubmitSm.create(clock, sms.sender(), sms.msisdn(), sms.message(), sms.validityPeriod()))
        .thenApply(resp -> mapSubmitSmResp(resp, details))
        .exceptionally(e -> SmppResponse.retriableError(e.getMessage(), details));
  }

  private static SmppResponse mapSubmitSmResp(final SubmitSmResp resp, final String details) {
    return SmppMapping.map(resp.commandStatus())
        .map(
            status ->
                new SmppResponse(
                    status.result(),
                    resp.messageId(),
                    status.name() + ": " + status.message(),
                    status.isSuccessful() ? null : details,
                    resp.destSubAddress()))
        .orElse(SmppResponse.failure("Unknown command status", details));
  }

  public String info() {
    return String.format("Group: %s", name);
  }

  public long getNumberOfActiveConnections() {
    return connections.stream().filter(SmppConnection::isActive).count();
  }

  @Override
  public void close() {
    connections.forEach(SmppConnection::close);
  }

  public boolean isHealthy() {
    // are all connections up?
    return getNumberOfActiveConnections() == connections.size();
  }
}