internal string Initialize(ILogger logger)
{
try
{
// Parse and process the function app dependencies defined in the manifest.
_dependenciesFromManifest = _storage.GetDependencies().ToArray();
if (!_dependenciesFromManifest.Any())
{
logger.Log(isUserOnlyLog: true, LogLevel.Warning, PowerShellWorkerStrings.FunctionAppDoesNotHaveDependentModulesToInstall);
return(null);
}
_currentSnapshotPath = _installedDependenciesLocator.GetPathWithAcceptableDependencyVersionsInstalled()
?? _storage.CreateNewSnapshotPath();
_purger.SetCurrentlyUsedSnapshot(_currentSnapshotPath, logger);
return(_currentSnapshotPath);
}
catch (Exception e)
{
var errorMsg = string.Format(PowerShellWorkerStrings.FailToInstallFuncAppDependencies, e.Message);
throw new DependencyInstallationException(errorMsg, e);
}
}
/// <summary>
/// Returns the path for the new dependencies snapshot.
/// </summary>
public string InstallAndPurgeSnapshots(Func <PowerShell> pwshFactory, ILogger logger)
{
try
{
// Purge before installing a new snapshot, as we may be able to free some space.
_purger.Purge(logger);
if (IsAnyInstallationStartedRecently())
{
return(null);
}
var nextSnapshotPath = _storage.CreateNewSnapshotPath();
using (var pwsh = pwshFactory())
{
_installer.InstallSnapshot(
_dependencyManifest,
nextSnapshotPath,
pwsh,
// Background dependency upgrades are optional because the current
// worker already has a good enough snapshot, and nothing depends on
// the new snapshot yet, so installation failures will not affect
// function invocations.
DependencySnapshotInstallationMode.Optional,
logger);
}
// Now that a new snapshot has been installed, there is a chance an old snapshot can be purged.
_purger.Purge(logger);
return(nextSnapshotPath);
}
catch (Exception e)
{
logger.Log(
isUserOnlyLog: false,
RpcLog.Types.Level.Warning,
string.Format(PowerShellWorkerStrings.DependenciesUpgradeSkippedMessage, e.Message));
return(null);
}
}
