com.couchbase.transactions.log.PersistedLogReader Maven / Gradle / Ivy

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/*
 * Copyright 2021 Couchbase, Inc.
 *
 * 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 com.couchbase.transactions.log;

import com.couchbase.client.core.annotation.Stability;
import com.couchbase.client.java.Collection;
import com.couchbase.client.java.json.JsonArray;
import com.couchbase.client.java.json.JsonObject;
import com.couchbase.client.java.kv.LookupInSpec;
import com.couchbase.transactions.error.internal.ErrorClasses;
import reactor.core.publisher.Flux;
import reactor.core.publisher.Mono;

import java.time.LocalDateTime;
import java.util.Arrays;

class LogEntry {
    public final String clientUuid;
    public final String value;
    public final LocalDateTime clientTime;
    public final String serverTime;

    LogEntry(String clientUuid, String value, LocalDateTime clientTime, String serverTime) {
        this.clientUuid = clientUuid;
        this.value = value;
        this.clientTime = clientTime;
        this.serverTime = serverTime;
    }

    static public LogEntry create(JsonObject o) {
        return new LogEntry(
                o.getString("u"),
                o.getString("v"),
                LocalDateTime.parse(o.getString("t")),
                o.getString("c"));
    }
}

@Stability.Internal
public class PersistedLogReader {
    public static Flux read(Collection collection) {
        return collection.reactive().lookupIn(PersistedLogWriter.PERSISTED_LOG_DOC_ID,
                Arrays.asList(
                        LookupInSpec.get("l.logs").xattr()
                ))

                .onErrorResume(err -> {
                    ErrorClasses ec = ErrorClasses.classify(err);
                    if (ec == ErrorClasses.FAIL_DOC_NOT_FOUND) {
                        return Mono.empty();
                    }
                    else {
                        return Mono.error(err);
                    }
                })

                .flatMapMany(result -> {
                    JsonArray logs = result.contentAsArray(0);

                    return Flux.fromIterable(logs)
                            .map(log -> LogEntry.create((JsonObject) log));
                });
    }
}