pubsub

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pubsub Examples and Code Snippets

PubSub

pypi

Lines of Code : 5

License : No License

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>>> r = redis.Redis(...)
>>> p = r.pubsub()
>>> p.subscribe('my-first-channel', 'my-second-channel', ...)
>>> p.get_message()
{'pattern': None, 'type': 'subscribe', 'channel': b'my-second-channel', 'data': 1}

PubSub

pypi

Lines of Code : 5

License : No License

Copy

>>> r = redis.Redis(...)
>>> p = r.pubsub()
>>> p.subscribe('my-first-channel', 'my-second-channel', ...)
>>> p.get_message()
{'pattern': None, 'type': 'subscribe', 'channel': b'my-second-channel', 'data': 1}

Community Discussions

Trending Discussions on pubsub

Firestore, query and update with node.js

Dynamically set bigquery table id in dataflow pipeline

Apache Beam Python gscio upload method has @retry.no_retries implemented causes data loss?

Ensure Fairness in Publisher/Subscriber Pattern

Include custom attributes using Spring Cloud Stream (StreamBridge)

Redis sentinel node can not sync after failover

Can we get conversation history from Azure Web PubSub

how to integrate events from Azure Events Hub (kafka interface) to google cloud pub/sub

Pub/Sub Ordering and Multi-Region

Terraform GCP Assign IAM roles to service account

QUESTION

Firestore, query and update with node.js

Asked 2021-Jun-15 at 20:01

I need a cloud function that triggers automatically once per day and query in my "users" collection where "watched" field is true and update all of them as false. I get "13:26 error Parsing error: Unexpected token MyFirstRef" this error in my terminal while deploying my function. I am not familiar with js so can anyone please correct function. Thanks.

...

ANSWER

Answered 2021-Jun-15 at 16:13

There are several points to correct in your code:

You need to return a Promise when all the asynchronous job is completed. See this doc for more details.
If you use the await keyword, you need to declare the function async, see here.
A QuerySnapshot has a forEach() method
You can get the DocumentReference of a doc from the QuerySnapshot just by using the ref property.

The following should therefore do the trick:

Source https://stackoverflow.com/questions/67989283

QUESTION

Dynamically set bigquery table id in dataflow pipeline

Asked 2021-Jun-15 at 14:30

I have dataflow pipeline, it's in Python and this is what it is doing:

Read Message from PubSub. Messages are zipped protocol buffer. One Message receive on a PubSub contain multiple type of messages. See the protocol parent's message specification below:
...

ANSWER

Answered 2021-Apr-16 at 18:49

How about using TaggedOutput.

Source https://stackoverflow.com/questions/67107333

QUESTION

Apache Beam Python gscio upload method has @retry.no_retries implemented causes data loss?

Asked 2021-Jun-14 at 18:49

I have a Python Apache Beam streaming pipeline running in Dataflow. It's reading from PubSub and writing to GCS. Sometimes I get errors like "Error in _start_upload while inserting file ...", which comes from:

...

ANSWER

Answered 2021-Jun-14 at 18:49

In a streaming pipeline, Dataflow retries work items running into errors indefinitely.

The code itself does not need to have retry logic.

Source https://stackoverflow.com/questions/67972758

QUESTION

Ensure Fairness in Publisher/Subscriber Pattern

Asked 2021-Jun-14 at 01:48

How can I ensure fairness in the Pub/Sub Pattern in e.g. kafka when one publisher produces thousands of messages, while all other producers are in a low digit of messages? It's not predictable which producer will have high activity.

It would be great if other messages from other producers don't have to wait hours just because one producer is very very active.

What are the patterns for that? Is it possible with Kafka or another technology like Google PubSub? If yes, how?

Multiple partitions also doesn't work very well in that case, or I can see how.

...

ANSWER

Answered 2021-Jun-14 at 01:48

In Kafka, you could utilise the concept of quotas to prevent a certain clients to monopolise the cluster resources.

There are 2 types of quotas that can be enforced:

Network bandwidth quotas
Request rate quotas

More detailed information on how these can be configured can be found in the official documentation of Kafka.

Source https://stackoverflow.com/questions/67916611

QUESTION

Include custom attributes using Spring Cloud Stream (StreamBridge)

Asked 2021-Jun-13 at 13:20

This document describes how to include custom attributes into PubSub messages.

https://cloud.google.com/pubsub/docs/samples/pubsub-publish-custom-attributes

Is this possible using the newer Spring Cloud Stream functional APIs?

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ANSWER

Answered 2021-Jun-13 at 13:20

You can publish Spring Message and specify your attributes as headers

Source https://stackoverflow.com/questions/67939295

QUESTION

Redis sentinel node can not sync after failover

Asked 2021-Jun-13 at 07:24

We have setup Redis with sentinel high availability using 3 nodes. Suppose fist node is master, when we reboot first node, failover happens and second node becomes master, until this point every thing is OK. But when fist node comes back it cannot sync with master and we saw that in its config no "masterauth" is set.
Here is the error log and Generated by CONFIG REWRITE config:

...

ANSWER

Answered 2021-Jun-13 at 07:24

For those who may run into same problem, problem was REDIS misconfiguration, after third deployment we carefully set parameters and no problem was found.

Source https://stackoverflow.com/questions/67749867

QUESTION

Can we get conversation history from Azure Web PubSub

Asked 2021-Jun-11 at 14:35

I am developing a chat window using Can we get conversation history from Azure Web PubSub. Is there a way i can get the convesation history.

...

ANSWER

Answered 2021-Jun-11 at 14:35

According to this FAQ, the Azure Web PubSub service works as a data processor service and does not store customer messages. Therefore, you need to leverage other Azure services to store the conversation history. There is a Chatr application built by Ben Coleman which may be a good reference for you. You could start from this blog.

Source https://stackoverflow.com/questions/67820565

QUESTION

how to integrate events from Azure Events Hub (kafka interface) to google cloud pub/sub

Asked 2021-Jun-11 at 12:56

I have a requirement where I need to consume a kafka topic on Azure events hub. POST endpoint needs to be created which will consume a topic provided as an argument. The message has to be send on a pubsub topic with the kafka topic as attribute and the message content as body.

This is a high level requirement. I have looked here to understand how this can be achieved. However, if anyone has implemented this in real time that is events from Azure events hub to google cloud pub sub or have worked on similar implementation, please help.

...

ANSWER

Answered 2021-Jun-10 at 07:58

As discussed in the comment section, in order to further contribuite to the community, I am posting the summary of our discussion as an answer.

Since your data's destination is BigQuery, you can use the Kafka to BigQuery template in Dataflow, you can use this template to load json messages from Kafka to BigQuery. In addition, according to the documentation,

How to use this Dataflow template Kafka to BigQuery This template creates a streaming pipeline that ingests JSON data from Kafka, executes an optional JavaScript user defined function (UDF), and writes the resulting records to BigQuery. Any errors during the transformation of the data, execution of the UDF, or writing into BigQuery will be written into a separate errors table in BigQuery. The errors table will be created if it does not exist.

Pipeline Requirements

The Kafka topic(s) exists and the message is encoded as a valid JSON.

The BigQuery output table exists.

The Kafka brokers are reachable from the Dataflow worker machines.

On the other hand, you can create your own template with your specific requirements using the KafkaIO method, you can check this tutorial to understand better how to start with.

Source https://stackoverflow.com/questions/67820912

QUESTION

Pub/Sub Ordering and Multi-Region

Asked 2021-Jun-09 at 15:10

While searching for the ordering features of Pub/Sub I stumbled upon the fact that ordering is preserved on the same region. Supposing I have ordered Pub/Sub subscriptions outside of GCP. Each subscription is on a different Datacenter on a Different Provider on another Region. How can I specify that those subscriptions will consume from a specific region? Is there an option on an ordered subscription to specify a region? If not then how Pub/Sub decides which region my application is located since it is provisioned in another datacenter, on another provider. Is the region assigned going to change?

...

ANSWER

Answered 2021-Jun-09 at 15:10

The ordering is preserved on the publish side only within a region. In other words, if you are publishing messages to multiple regions, only messages within the same region will be delivered in a consistent order. If your messages were all published to the same region, but your subscribers are spread across regions, then the subscribers will receive all messages in order. If you want to guarantee that your publishes all go to the same region to ensure they are in order, then you can use the regional service endpoints.

Source https://stackoverflow.com/questions/67906441

QUESTION

Terraform GCP Assign IAM roles to service account

Asked 2021-Jun-08 at 17:19

I'm using the following

...

ANSWER

Answered 2021-Jun-06 at 21:47

I think this is achieved with this resource:

https://registry.terraform.io/providers/hashicorp/google/latest/docs/resources/google_service_account_iam

So with your code, minus the data sources, alter to taste:

Source https://stackoverflow.com/questions/67863863