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https://github.com/mattlangsenkamp/otel4s-context-propagation
A demo showing some of what is possible with OpenTelemetry and the Typelevel stack
https://github.com/mattlangsenkamp/otel4s-context-propagation
cassandra elasticsearch grpc kafka opentelemetry postgres scala scala3 typelevel
Last synced: 25 days ago
JSON representation
A demo showing some of what is possible with OpenTelemetry and the Typelevel stack
- Host: GitHub
- URL: https://github.com/mattlangsenkamp/otel4s-context-propagation
- Owner: MattLangsenkamp
- Created: 2024-02-27T03:34:22.000Z (8 months ago)
- Default Branch: main
- Last Pushed: 2024-05-18T17:55:18.000Z (6 months ago)
- Last Synced: 2024-09-30T04:02:58.919Z (about 1 month ago)
- Topics: cassandra, elasticsearch, grpc, kafka, opentelemetry, postgres, scala, scala3, typelevel
- Language: Scala
- Homepage: https://mattlangsenkamp.github.io/posts/otel4s-context-propagation/
- Size: 278 KB
- Stars: 8
- Watchers: 1
- Forks: 3
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# Context Propagation with otel4s
## System Requirements
This application depends on scala, sbt and docker. It was developed with sbt 1.9.8, scala 3.3.1 and Docker 25.0.3. Other version will likely work for all dependencies.
## System Architecture
Below is a diagram of the whole system. The arrows from one service to another represent the direction the data flows.
## Running
Built the docker containers by running `sbt docker`
Run `docker compose up -d` to start all containers.
After a second or two run the following command in the console.
`curl -X POST localhost:8080/api/v1/push_message?message=hello!`
you should get a response telling you how long it waited in the gRPC server.
## Viewing the Datastores
### Elasticsearch
Go to `http://localhost:5601/app/dev_tools#/console`
Run the following query:
```
GET elastic_messages/_search
{
"query": {
"match_all": {}
}
}
```
### Postgres
Log into postgres using something like DBeaver. Run the following query:
```
select * from postgres_messages;
```
### Cassandra
Start a CQL session using docker
```
docker run --rm -it --network oteldemo-network nuvo/docker-cqlsh cqlsh cassandra 9042 --cqlversion='3.4.6'
```
then run
```
select * from store.cassandra_messages;
```
## Tracing
To see traces for each http request go to `http://localhost:16686/search`. Individual traces look like what is displayed below.
