Fix sqlite busy errors

[jlewi]

Fix sqlite busy errors with session based learning

There were a couple different errors

• We were still enqueing block ids and not sessions in some places
• When we call Enqueue we should filter out sessions that aren't suitable for learning; this should minimize DB contention
• Improve logging

By default sqlite doesn't have any retries for SQLITE_BUSY errors. We could configure a timeout for retries using a PRAGMA; we should probably do that but I want to hold off to see if this PR fixes the contention.

• Filed Enable pragma busy_timeout in sqlite #348 to follow up on this

Use ko to create docker images as part of the development process

• This is convenient when we want to build a docker image from our latest changes without doing a relase.
• Change the Dockerfile to not include any arguments so that it is compatible with the image ko builds

[netlify]

✅ Deploy Preview for foyle canceled.

Name	Link
🔨 Latest commit	fa84ee6
🔍 Latest deploy log	https://app.netlify.com/sites/foyle/deploys/674402b8f7f4350009456316

[standard-input]

Suggested change

	// isLearnable returns true if the session is eligible for learning and false otherwise
	func isLearnable(session *logspb.Session) bool {
	// Make sure there is a cell execution log event.
	// Right now we rely on the cell execution log event to get the actual cell content.
	// So we can't learn from sessions without cell execution events. TN013 has some ideas for how we could
	// learn in the event of non cell execution events.
	execEvent := getLastExecEvent(session)
	if execEvent == nil {
	// Since the cell wasn't successfully executed we don't learn from it
	sessProcessed.WithLabelValues("noexec").Inc()
	return false
	}
	log := zapr.NewLogger(zap.L())
	if session.GetFullContext() == nil {
	sessProcessed.WithLabelValues("nocontext").Inc()
	log.Error(errors.New("Session missing fullcontext"), "contextId", session.GetContextId())
	return false
	}
	if session.GetFullContext().GetNotebook() == nil {
	sessProcessed.WithLabelValues("nonotebook").Inc()
	log.Error(errors.New("Session missing notebook"), "contextId", session.GetContextId())
	return false
	}
	if session.GetFullContext().GetSelected() == 0 {
	// If its the first cell we can't learn from it because what would we use as context to predict it?
	// isLearnable determines if the session is learnable based on the presence of execution events and contextual information.
	func isLearnable(session *logspb.Session) bool {
	// Make sure there is a cell execution log event.
	// Right now we rely on the cell execution log event to get the actual cell content.
	// So we can't learn from sessions without cell execution events. TN013 has some ideas for how we could
	// learn in the event of non cell execution events.
	execEvent := getLastExecEvent(session)
	if execEvent == nil {
	// Since the cell wasn't successfully executed we don't learn from it
	sessProcessed.WithLabelValues("noexec").Inc()
	return false
	}
	log := zapr.NewLogger(zap.L())
	if session.GetFullContext() == nil {
	sessProcessed.WithLabelValues("nocontext").Inc()
	log.Error(errors.New("session missing full context"), "contextId", session.GetContextId())
	return false
	}
	if session.GetFullContext().GetNotebook() == nil {
	sessProcessed.WithLabelValues("nonotebook").Inc()
	log.Error(errors.New("session missing notebook"), "contextId", session.GetContextId())
	return false
	}
	if session.GetFullContext().GetSelected() == 0 {
	// If it's the first cell we can't learn from it because what would we use as context to predict it?

add comment to isLearnable function, fix typos in error messages

[standard-input]

Suggested change

	// getLasExecEvent returns the last successful execution event in the session
	// or null if there isn't one.
	func getLastExecEvent(session *logspb.Session) *v1alpha1.LogEvent {
	// getLastExecEvent retrieves the last successful execution log event from a session.
	func getLastExecEvent(session *logspb.Session) *v1alpha1.LogEvent {

add comment to getLastExecEvent function