MarketplaceDapr

How to setup the environment

Make sure you have Dapr CLI installed

https://github.com/dapr/cli

An observation: if you have arm64 architecture, you may need to install Dapr with the following command:

arch -arm64 brew install dapr/tap/dapr-cli

After installing Dapr cli, you can initiate it.

If Docker is available in your environment, just execute:

dapr init

Otherwise:

dapr init --slim

This version will not install default configuration files and set up the Dapr services. In this case, make sure you have a Redis running in the default port to serve as a pubsub for the Dapr apps. You can achieve this using Docker:

docker run -d --name redis -p 6379:6379 redis:latest

How to run

You can execute the microservices individually through the following template command:

dapr run --app-id <MICROSERVICE_NAME> --app-port <PORT> -- dotnet run [--project <CSPROJ_FILEPATH>]

Example:

dapr run --app-id cart --app-port 5001 -- dotnet run --project CartMS.csproj

However, you have to execute a separate dapr run command for every application.

In this sense, Dapr offers in Linux/MacOS a "Multi-App Run" feature. Through a description file, information about all applications are processed and executed by the Dapr runtime.

In the root of this project here a dapr.yaml file, which describes a multi-app dapr execution. You can execute all applications through the following command (make sure iou are in the root of the project):

dapr run -f dapr.yaml

On the other hand, as a preview feature, it shows a performance gap: it takes some time for all listed applications to get up running.

Therefore, there is a bash script that simply creates several terminals, one for each application.

if you are in MacOs, run:

cmhmod 775 deploy_macos.sh
./deploy_macos.sh

How to trigger transactions

Useful links

Killing Postgres instances

PostgresApp/PostgresApp#96 (comment)

Killing Dapr process

https://stackoverflow.com/questions/11583562/how-to-kill-a-process-running-on-particular-port-in-linux

Health checks

could enable dapr health check instead of aspnet, but since it is preview feature, better keep like this https://docs.dapr.io/developing-applications/building-blocks/observability/app-health/ https://www.ibm.com/garage/method/practices/manage/health-check-apis/ https://learn.microsoft.com/en-us/aspnet/core/fundamentals/environments?view=aspnetcore-7.0#set-environment-on-the-command-line https://laurentkempe.com/2023/02/27/debugging-dapr-applications-with-rider-or-visual-studio-a-better-way/

Retry policies

https://docs.dapr.io/operations/resiliency/policies

Dead letter queue

https://docs.dapr.io/developing-applications/building-blocks/pubsub/pubsub-deadletter/

Metrics

https://docs.dapr.io/operations/monitoring/metrics/metrics-overview/ https://docs.dapr.io/operations/monitoring/metrics/prometheus/ https://github.com/RicardoNiepel/dapr-docs/blob/master/howto/setup-monitoring-tools/observe-metrics-with-prometheus-locally.md https://prometheus.io/docs/prometheus/latest/getting_started/

Docker

https://stackoverflow.com/questions/40513545/how-to-prevent-docker-from-starting-a-container-automatically-on-system-startup

Virtualized deployments

https://mikehadlow.com/posts/2022-06-24-writing-dotnet-services-for-kubernetes/

PostgreSQL

https://dba.stackexchange.com/questions/274788/postgres-show-max-connections-output-a-different-value-from-postgresql-conf https://stackoverflow.com/questions/8288823/query-a-parameter-postgresql-conf-setting-like-max-connections

Redis

https://stackoverflow.com/questions/28785383/how-to-disable-persistence-with-redis

Running bash script

https://unix.stackexchange.com/questions/27054/bin-bash-no-such-file-or-directory