Show HN: Inquery (YC W23) – Real-time events for Postgres (opens in new tab)

(github.com)

23 pointsmitchpatin3y ago15 comments

Hi HN, we're excited to share our open source tool with the community!

Inquery is a utility for Postgres that triggers webhooks when rows are inserted, updated, or deleted. It uses database triggers that send low-latency websocket messages to a Go application. This application then calls any configured webhooks with a JSON payload that includes specified values from the database row.

Let us know if you have any feedback or questions!

15 comments

drx3y ago

Pretty cool! Any plans for a cloud version? If so, what would be the pricing model?

mitchpatinOP3y ago

Thanks! We've discussed offering a cloud version at some point; however, we're initially focused on the self-hosted version.

Regarding the cloud option, we'd likely take a usage-based approach to pricing. Not sure if that would be based on number of events, actions, or some combination of the two. When we do offer this, we'll make sure that the free tier is generous and easy for small projects to use without worrying about paying.

v3ss0n3y ago

Supabase said 8k payload limit of listen/ notify is deal breaker for them so they had to start own websocket based realtime engine by watching oplog. How would you handle that?

ciminelli3y ago

We're working on and looking into a few different solutions right now:

1. Split the payload into chunks of 8k bytes and send them as separate messages to the server (in progress, will be released in the next few days).

2. Use a new table as an event queue where the trigger will write data and our server will consume it. We do want to incorporate an event queue soon so this approach would solve for that as long as users are ok with the system writing to a new table.

3. Use one of the Postgres logs to stream events instead of LISTEN/NOTIFY.

Let me know if you have thoughts on any of these approaches!

tony_landis3y ago

What are the specific requirements postgres must soppprt? Any extensions or pl language support needed?

ciminelli3y ago

No extensions are required since we're using LISTEN/NOTIFY in the triggers! We haven't tested full backwards compatibility with older versions but are planning on doing that soon.

halotrope3y ago

This is exactly what I was looking for. Can you add it to Supabase please?

kiwicopple3y ago

{disclosure - supabase employee}

hopefully this isn't detracting too much from Inquery's product, which looks great, but I thought it's worth flagging - https://supabase.com/docs/guides/database/webhooks

mitchpatinOP3y ago

Not at all detracting - we're big fans of Supabase! We're taking a bit of a different approach by trying to bring tools to existing databases (like those hosted in RDS) as opposed to the full platform approach.

We played around with Database Webhooks in Supabase and really liked the experience!

1 more reply

mritchie7123y ago

Yeah, we already use this feature in Supabase, works great!

somehelpful3y ago

Are you using NOTIFY? If so, how do you handle the limit of 8000 bytes?

ciminelli3y ago

Yes and great question, right now we are limited to 8000 bytes but are working on an update to handle large payloads via chunking—stay tuned!

avinassh3y ago

can you elaborate on how this would work?

1 more reply

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15 comments

drx3y ago

Pretty cool! Any plans for a cloud version? If so, what would be the pricing model?

mitchpatinOP3y ago

Thanks! We've discussed offering a cloud version at some point; however, we're initially focused on the self-hosted version.

v3ss0n3y ago

Supabase said 8k payload limit of listen/ notify is deal breaker for them so they had to start own websocket based realtime engine by watching oplog. How would you handle that?

ciminelli3y ago

We're working on and looking into a few different solutions right now:

1. Split the payload into chunks of 8k bytes and send them as separate messages to the server (in progress, will be released in the next few days).

3. Use one of the Postgres logs to stream events instead of LISTEN/NOTIFY.

Let me know if you have thoughts on any of these approaches!

tony_landis3y ago

What are the specific requirements postgres must soppprt? Any extensions or pl language support needed?

ciminelli3y ago

No extensions are required since we're using LISTEN/NOTIFY in the triggers! We haven't tested full backwards compatibility with older versions but are planning on doing that soon.

halotrope3y ago

This is exactly what I was looking for. Can you add it to Supabase please?

kiwicopple3y ago

{disclosure - supabase employee}

hopefully this isn't detracting too much from Inquery's product, which looks great, but I thought it's worth flagging - https://supabase.com/docs/guides/database/webhooks

mitchpatinOP3y ago

We played around with Database Webhooks in Supabase and really liked the experience!

1 more reply

mritchie7123y ago

Yeah, we already use this feature in Supabase, works great!

somehelpful3y ago

Are you using NOTIFY? If so, how do you handle the limit of 8000 bytes?

ciminelli3y ago

Yes and great question, right now we are limited to 8000 bytes but are working on an update to handle large payloads via chunking—stay tuned!

avinassh3y ago

can you elaborate on how this would work?

1 more reply

j / k navigate · click thread line to collapse