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package it.niedermann.nextcloud.deck.remote.helpers;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import com.nextcloud.android.sso.exceptions.NextcloudHttpRequestFailedException;
import java.net.HttpURLConnection;
import java.time.Instant;
import java.util.List;
import java.util.concurrent.CountDownLatch;
import it.niedermann.nextcloud.deck.DeckLog;
import it.niedermann.nextcloud.deck.database.DataBaseAdapter;
import it.niedermann.nextcloud.deck.model.Account;
import it.niedermann.nextcloud.deck.model.enums.DBStatus;
import it.niedermann.nextcloud.deck.model.interfaces.IRemoteEntity;
import it.niedermann.nextcloud.deck.remote.adapters.ServerAdapter;
import it.niedermann.nextcloud.deck.remote.api.ResponseCallback;
import it.niedermann.nextcloud.deck.remote.helpers.providers.AbstractSyncDataProvider;
import it.niedermann.nextcloud.deck.remote.helpers.providers.IRelationshipProvider;
public class SyncHelper {
@NonNull
private final ServerAdapter serverAdapter;
@NonNull
private final DataBaseAdapter dataBaseAdapter;
@Nullable
private final Instant lastSync;
private final boolean etagsEnabled;
private Account account;
private long accountId;
private ResponseCallback<Boolean> responseCallback;
public SyncHelper(@NonNull ServerAdapter serverAdapter, @NonNull DataBaseAdapter dataBaseAdapter, @Nullable Instant lastSync) {
this.serverAdapter = serverAdapter;
this.dataBaseAdapter = dataBaseAdapter;
this.lastSync = lastSync;
// check only once per sync
this.etagsEnabled = serverAdapter.isEtagsEnabled();
}
// Sync Server -> App
public <T extends IRemoteEntity> void doSyncFor(@NonNull final AbstractSyncDataProvider<T> provider) {
provider.registerChildInParent(provider);
provider.getAllFromServer(serverAdapter, dataBaseAdapter, accountId, new ResponseCallback<>(account) {
@Override
public void onResponse(List<T> response) {
if (response != null) {
provider.goingDeeper();
for (T entityFromServer : response) {
if (entityFromServer == null) {
// see https://github.com/stefan-niedermann/nextcloud-deck/issues/574
DeckLog.error("Skipped null value from server for DataProvider:", provider.getClass().getSimpleName());
continue;
}
entityFromServer.setAccountId(accountId);
T existingEntity = provider.getSingleFromDB(dataBaseAdapter, accountId, entityFromServer);
if (existingEntity == null) {
provider.createInDB(dataBaseAdapter, accountId, entityFromServer);
} else {
//TODO: how to handle deletes? what about archived?
if (existingEntity.getStatus() != DBStatus.UP_TO_DATE.getId()) {
DeckLog.warn("Conflicting changes on entity:", existingEntity);
// TODO: what to do?
} else {
if (etagsEnabled && entityFromServer.getEtag() != null && entityFromServer.getEtag().equals(existingEntity.getEtag())) {
DeckLog.log("[" + provider.getClass().getSimpleName() + "] ETags do match! skipping " + existingEntity.getClass().getSimpleName() + " with localId: " + existingEntity.getLocalId());
continue;
}
provider.updateInDB(dataBaseAdapter, accountId, applyUpdatesFromRemote(provider, existingEntity, entityFromServer, accountId), false);
}
}
existingEntity = provider.getSingleFromDB(dataBaseAdapter, accountId, entityFromServer);
provider.goDeeper(SyncHelper.this, existingEntity, entityFromServer, responseCallback);
}
provider.handleDeletes(serverAdapter, dataBaseAdapter, accountId, response);
provider.doneGoingDeeper(responseCallback, true);
} else {
provider.childDone(provider, responseCallback, false);
}
}
@Override
public void onError(Throwable throwable) {
if (throwable.getClass() == NextcloudHttpRequestFailedException.class) {
final NextcloudHttpRequestFailedException requestFailedException = (NextcloudHttpRequestFailedException) throwable;
if (HttpURLConnection.HTTP_NOT_MODIFIED == requestFailedException.getStatusCode()) {
DeckLog.log("[" + provider.getClass().getSimpleName() + "] ETags do match! skipping this one.");
// well, etags say we're fine here. no need to go deeper.
provider.childDone(provider, responseCallback, false);
return;
}
}
super.onError(throwable);
provider.onError(responseCallback);
responseCallback.onError(throwable);
}
}, lastSync);
}
// Sync App -> Server
public <T extends IRemoteEntity> void doUpSyncFor(@NonNull AbstractSyncDataProvider<T> provider) {
doUpSyncFor(provider, null);
}
public <T extends IRemoteEntity> void doUpSyncFor(@NonNull AbstractSyncDataProvider<T> provider, @Nullable CountDownLatch countDownLatch) {
final List<T> allFromDB = provider.getAllChangedFromDB(dataBaseAdapter, accountId, lastSync);
if (allFromDB != null && !allFromDB.isEmpty()) {
for (T entity : allFromDB) {
if (entity.getId() != null) {
if (entity.getStatusEnum() == DBStatus.LOCAL_DELETED) {
provider.deleteOnServer(serverAdapter, accountId, getDeleteCallback(provider, entity), entity, dataBaseAdapter);
if (countDownLatch != null) {
countDownLatch.countDown();
}
} else {
provider.updateOnServer(serverAdapter, dataBaseAdapter, accountId, getUpdateCallback(provider, entity, countDownLatch), entity);
}
} else {
provider.createOnServer(serverAdapter, dataBaseAdapter, accountId, getUpdateCallback(provider, entity, countDownLatch), entity);
}
}
} else {
provider.goDeeperForUpSync(this, serverAdapter, dataBaseAdapter, responseCallback);
if (countDownLatch != null) {
countDownLatch.countDown();
}
}
}
private <T extends IRemoteEntity> ResponseCallback<Void> getDeleteCallback(@NonNull AbstractSyncDataProvider<T> provider, T entity) {
return new ResponseCallback<>(account) {
@Override
public void onResponse(Void response) {
provider.deletePhysicallyInDB(dataBaseAdapter, accountId, entity);
provider.goDeeperForUpSync(SyncHelper.this, serverAdapter, dataBaseAdapter, responseCallback);
}
@Override
public void onError(Throwable throwable) {
super.onError(throwable);
responseCallback.onError(throwable);
}
};
}
private <T extends IRemoteEntity> ResponseCallback<T> getUpdateCallback(@NonNull AbstractSyncDataProvider<T> provider, @NonNull T entity, @Nullable CountDownLatch countDownLatch) {
return new ResponseCallback<>(account) {
@Override
public void onResponse(T response) {
response.setAccountId(this.account.getId());
T update = applyUpdatesFromRemote(provider, entity, response, accountId);
update.setId(response.getId());
update.setStatus(DBStatus.UP_TO_DATE.getId());
provider.updateInDB(dataBaseAdapter, accountId, update, false);
provider.goDeeperForUpSync(SyncHelper.this, serverAdapter, dataBaseAdapter, responseCallback);
if (countDownLatch != null) {
countDownLatch.countDown();
}
}
@Override
public void onError(Throwable throwable) {
super.onError(throwable);
responseCallback.onError(throwable);
if (countDownLatch != null) {
countDownLatch.countDown();
}
}
};
}
public void fixRelations(@NonNull IRelationshipProvider relationshipProvider) {
// this is OK, since the delete only affects records with status UP_TO_DATE
relationshipProvider.deleteAllExisting(dataBaseAdapter, accountId);
relationshipProvider.insertAllNecessary(dataBaseAdapter, accountId);
}
private <T extends IRemoteEntity> T applyUpdatesFromRemote(@NonNull AbstractSyncDataProvider<T> provider, @NonNull T localEntity, @NonNull T remoteEntity, @NonNull Long accountId) {
if (!accountId.equals(localEntity.getAccountId())) {
throw new IllegalArgumentException("IDs of Accounts are not matching! WTF are you doin?!");
}
remoteEntity.setLocalId(localEntity.getLocalId());
remoteEntity = provider.applyUpdatesFromRemote(localEntity, remoteEntity, accountId);
return remoteEntity;
}
public SyncHelper setResponseCallback(@NonNull ResponseCallback<Boolean> callback) {
this.responseCallback = callback;
this.account = responseCallback.getAccount();
accountId = account.getId();
return this;
}
public interface Factory {
SyncHelper create(@NonNull ServerAdapter serverAdapter, @NonNull DataBaseAdapter dataBaseAdapter, @Nullable Instant lastSync);
}
}
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