private async Task NotifyCosmosOfRunningMigration(MigrationDetails details)
{
var versionDocument = await CosmosRepository.ReadVersionDocumentAsync();
if (!(versionDocument is null) && versionDocument.IsApplyingMigration)
{
throw new OnGoingMigrationException(
$"Could not apply migration: {details.MigrationNumber}: Last migration was not complete");
}
await UpdateCosmosMigrationState(details, true, true);
}
private async Task RunMigration(MigrationDetails details)
{
try
{
await Migrate();
details.DidSucceed = true;
}
catch (Exception e)
{
details.DidSucceed = false;
details.FailureMessage = e.Message;
}
}
private async Task UpdateCosmosMigrationState(MigrationDetails details, bool isRunning, bool canFail)
{
try
{
await CosmosRepository.UpsertDocumentAsync(details);
await CosmosRepository.UpdateVersionDocumentAsync(details.MigrationNumber, isRunning);
}
catch (Exception e)
{
if (!canFail)
{
throw e;
}
}
}
public async Task ExectuteMigration(ICosmosRepository cosmosRepository, int migrationNumber)
{
CosmosRepository = cosmosRepository;
var details = new MigrationDetails();
details.MigrationNumber = migrationNumber;
details.id = details.id +
(migrationNumber == -1 ? GetType().Name : migrationNumber.ToString());
details.Started = DateTime.UtcNow;
details.Title = GetType().Name;
await NotifyCosmosOfRunningMigration(details);
await RunMigration(details);
await NotifyCosmosOfFinishedMigration(details);
}
public async Task AddMigrationDetailsAsync(MigrationDetails details)
{
await UpsertDocumentAsync(details);
}
private async Task NotifyCosmosOfFinishedMigration(MigrationDetails details)
{
details.Stopped = DateTime.UtcNow;
await UpdateCosmosMigrationState(details, !details.DidSucceed, false);
}
