# KafkaRest
Elixir kafka rest proxy client for [Confluent REST Proxy](https://docs.confluent.io/current/kafka-rest/index.html)
## Examples
### Produce
```
{:ok, conn} = Kafka.produce("http://localhost:8082/", "topic_name', [%{value: %{foo: "bar"}}])
:ok == Kafka.close(conn)
```
### Consume
```
defmodule TestModule do
@behaviour Kashka.GenConsumer
def init(conn, _args) do
{:ok, conn, :state}
end
def handle_message_set(conn, :state, message_set) do
IO.inspect(message_set)
#[%{"key" => nil, "offset" => 0, "partition" => 0, "topic" => "test_name", "value" => %{"foo" => "bar"}}]
{:ok, conn, :state}
end
end
args = [
url: "http://localhost:8082/",
name: "my",
consumer_group: "consumer_group",
topics: ["topic_name"],
module: TestModule,
delete_on_exists: false,
retry_on_exists: true,
consumer_opts: %{"auto.offset.reset": :earliest, "auto.commit.enable": true},
]
{:ok, pid} = GenConsumer.start_link(args)
```
### More
See tests for more examples
### Kafka URL explanation
Kafka URL can be a String or a Keyword list. Keyword list can contains url, headers, fix_schema, fix_port, fix_host keys.
Examples:
```
[url: "http://127.0.0.1:8811", headers: [{"host", "smth.com"}]]
```
With `fix_* keys`:
```
[url: "http://127.0.0.1", fix_port: true, fix_schema: true, fix_host: true, headers: [{"host", "smth.com"}]]
```
`fix_*` keys used to automatically preprocess the url returned from create consumer method. For example if create_consumer method returns
`https://smth1.com:443/comsumers/group/instances/name` as a base_uri, it is transformed to `http://127.0.0.1:80/comsumers/group/instances/name` with host header `smth1.com`
It can be helpfull while connecting to kafka resp api through nginx proxy
## How to run tests
* run `doker-compose up` in separate window
* run `mix test`
## TODO
* Make protection from endless loop in Kashka.Http.request
* Correctly process other errors in Kashka.Http.request
* Add documentation
[](https://funbox.ru)
