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Paul-Christian Volkmer
2025-07-11 23:15:18 +02:00
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name: "Run build and deploy"
on:
push:
branches: [ 'master' ]
jobs:
docker:
runs-on: ubuntu-latest
steps:
- uses: actions/checkout@v4
- name: Set up Docker Buildx
uses: docker/setup-buildx-action@v3
- name: Login to Docker Hub
uses: docker/login-action@v3
with:
registry: ghcr.io
username: ${{ github.actor }}
password: ${{ secrets.GITHUB_TOKEN }}
- name: Execute image build and push
run: |
docker build -t ghcr.io/pcvolkmer/dnpm-kafka-rest-proxy .
docker push ghcr.io/pcvolkmer/dnpm-kafka-rest-proxy

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/.idea
/target
*.iml
Cargo.lock

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[package]
name = "dnpm-kafka-rest-proxy"
version = "0.1.0"
edition = "2024"
authors = ["Paul-Christian Volkmer <code@pcvolkmer.de>"]
license = "AGPL-3.0"
description = "DNPM MTB REST Proxy für Kafka"
# Dependencies
[dependencies]
clap = { version = "4.5", features = ["derive", "env"] }
log = "0.4"
axum = { version = "0.8", features = ["tracing"] }
tracing = "0.1"
tracing-subscriber = "0.3"
tokio = { version = "1.46", features = ["rt-multi-thread"] }
tower-http = { version = "0.6", features = ["trace"] }
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
uuid = { version = "1.17", features = ["v4"] }
base64 = "0.22"
bcrypt = "0.17"
rdkafka = { version = "0.38.0", features = ["cmake-build", "libz-static"] }
async-trait = "0.1"
# DTOs
mv64e-mtb-dto = { git = "https://github.com/dnpm-dip/mv64e-mtb-dto-rs", branch = "master" }
[dev-dependencies]
tower = "0.5"
http-body-util = "0.1"
mockall = "0.13"
# Lints
[lints.clippy]
unwrap_used = "deny"
expect_used = "deny"
panic = "deny"
pedantic = { level = "warn", priority = -1 }
[lints.rust]
unused_must_use = "deny"
# Profiles
[profile.release]
opt-level = "s"
codegen-units = 1
lto = "thin"
strip = true
panic = "abort"

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FROM rust:alpine AS back-stage
RUN apk update
RUN apk add cmake make musl-dev g++
WORKDIR /build
COPY Cargo.toml ./
COPY src ./src
COPY test-files ./test-files
# Run tests before release build
RUN cargo test --release
RUN cargo build --release
# Build image from scratch
FROM scratch
LABEL org.opencontainers.image.source="https://github.com/pcvolkmer/dnpm-kafka-rest-proxy"
LABEL org.opencontainers.image.licenses="AGPL-3.0-or-later"
LABEL org.opencontainers.image.description="DNPM MTB REST Proxy für Kafka"
COPY --from=back-stage /build/target/release/dnpm-kafka-rest-proxy .
USER 65532
EXPOSE 3000
CMD ["./bwhc-kafka-rest-proxy"]

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THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published
by the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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# DNPM Kafka Rest Proxy
DNPM Datenmodell 2.1 REST Proxy für Kafka
### Einordnung innerhalb einer DNPM-ETL-Strecke
Diese Anwendung erlaubt das Weiterleiten von REST Anfragen mit einem Request-Body und Inhalt im DNPM-Datenmodell 2.1
sowie `Content-Type` von `application/json` an einen Apache Kafka Cluster.
Verwendung im Zusammenspiel mit https://github.com/pcvolkmer/etl-processor
## Konfiguration
Beim Start der Anwendung können Parameter angegeben werden.
```
Usage: dnpm-kafka-rest-proxy [OPTIONS] --token <TOKEN>
Options:
--bootstrap-server <BOOTSTRAP_SERVER>
Kafka Bootstrap-Server(s) [env: KAFKA_BOOTSTRAP_SERVERS=] [default: kafka:9094]
--topic <TOPIC>
Kafka Topic [env: APP_KAFKA_TOPIC=] [default: etl-processor_input]
--token <TOKEN>
bcrypt hashed Security Token [env: APP_SECURITY_TOKEN=]
--listen <LISTEN>
Address and port for HTTP requests [env: APP_LISTEN=] [default: [::]:3000]
```
Die Anwendung lässt sich auch mit Umgebungsvariablen konfigurieren.
* `APP_KAFKA_SERVERS`: Zu verwendende Kafka-Bootstrap-Server als kommagetrennte Liste
* `APP_KAFKA_TOPIC`: Zu verwendendes Topic zum Warten auf neue Anfragen. Standardwert: `etl-processor_input`
* `APP_SECURITY_TOKEN`: Verpflichtende Angabe es Tokens als *bcrypt*-Hash
* `APP_LISTEN`: Adresse und Port für eingehende HTTP-Requests. Standardwert: `[::]:3000` - Port `3000` auf allen
Adressen (IPv4 und IPv6)
Die Angabe eines Tokens ist verpflichtend und kann entweder über den Parameter `--token` erfolgen, oder über die
Umgebungsvariable `APP_SECURITY_TOKEN`.
## HTTP-Requests
Die folgenden Endpunkte sind verfügbar:
* **POST** `/mtbfile`: Senden eines MTB-Files
* **DELETE** `/mtbfile/:patient_id`: Löschen von Informationen zu dem Patienten
Übermittelte MTB-Files müssen erforderliche Bestandteile beinhalten, ansonsten wird die Anfrage zurückgewiesen.
Zum Löschen von Patienteninformationen wird intern ein MTB-File mit Consent-Status `REJECTED` erzeugt und weiter
geleitet. Hier ist kein Request-Body erforderlich.
Bei Erfolg enthält die Antwort im HTTP-Header `x-request-id` die Anfrage-ID, die auch im ETL-Prozessor verwendet
wird.
### Authentifizierung
Requests müssen einen HTTP-Header `authorization` für HTTP-Basic enthalten. Hier ist es erforderlich, dass der
Benutzername `token` gewählt wird.
Es ist hierzu erforderlich, die erforderliche Umgebungsvariable `APP_SECURITY_TOKEN` zu setzen. Dies kann z.B. mit
*htpasswd* erzeugt werden:
```
htpasswd -Bn token
```
Der hintere Teil (hinter `token:`) entspricht dem *bcrypt*-Hash des Tokens.
### Beispiele für HTTP-Requests und resultierende Kafka-Records
Beispiele für gültige HTTP-Requests zum Übermitteln und Löschen eines MTB-Files.
#### Übermittlung eines MTB-Files
Anfrage mit *curl*, hier mit beiliegendem Test-File:
```bash
curl -u token:very-secret \
-H "Content-Type: application/json" \
--data @test-files/mv64e-mtb-fake-patient.json \
http://localhost:3000/mtb/etl/patient-record
```
Antwort:
```
HTTP/1.1 202 Accepted
x-request-id: 1804d5c1-af3d-4f75-81a0-d9ca7c9739ef
content-length: ...
date: Sat, 09 Mar 2024 11:16:44 GMT
```
Resultierender Kafka-Record:
* **Key**: `{"pid":"P1"}`
* **Headers**:
* `requestId`: `1804d5c1-af3d-4f75-81a0-d9ca7c9739ef`
* **Value**: Inhalt des HTTP-Request-Bodies/Test-Files
#### Löschen von Patienten
Anfrage auch hier mit *curl*:
```bash
curl -u token:very-secret \
-H "Content-Type: application/json" \
-X DELETE \
http://localhost:3000/mtb/etl/patient-record/P1
```
Antwort:
```
HTTP/1.1 202 Accepted
x-request-id: 8473fa67-8b18-4e8f-aa89-874f74fcc672
content-length: ...
date: Sat, 09 Mar 2024 11:24:35 GMT
```
Resultierender Kafka-Record:
* **Key**: `{"pid":"P1"}`
* **Headers**:
* `requestId`: `8473fa67-8b18-4e8f-aa89-874f74fcc672`
* **Value**: JSON-String mit Patienten-ID `P1` und ohne weitere Angaben.
Es werden keine weiteren patientenbezogenen Daten übermittelt.
In optionaler Verbindung mit [Key-Based-Retention](https://github.com/CCC-MF/etl-processor#key-based-retention) wird
lediglich der letzte und aktuelle Record, hier die Information ohne Consent-Zustimmung, in Kafka vorgehalten.
Trifft dieser Kafka-Record im [ETL-Prozessor](https://github.com/CCC-MF/etl-processor) ein, so wird dort ebenfalls eine
Löschanfrage ausgelöst, da keine Modellvorhaben Metadaten enthalten sind.

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services:
kafka:
image: bitnami/kafka
hostname: kafka
ports:
- "9092:9092"
- "9094:9094"
environment:
ALLOW_PLAINTEXT_LISTENER: "yes"
KAFKA_CFG_NODE_ID: "0"
KAFKA_CFG_PROCESS_ROLES: "controller,broker"
KAFKA_CFG_LISTENERS: PLAINTEXT://:9092,CONTROLLER://:9093,EXTERNAL://:9094
KAFKA_CFG_ADVERTISED_LISTENERS: PLAINTEXT://kafka:9092,EXTERNAL://localhost:9094
KAFKA_CFG_LISTENER_SECURITY_PROTOCOL_MAP: CONTROLLER:PLAINTEXT,EXTERNAL:PLAINTEXT,PLAINTEXT:PLAINTEXT
KAFKA_CFG_INTER_BROKER_LISTENER_NAME: PLAINTEXT
KAFKA_CFG_AUTO_CREATE_TOPICS_ENABLE: "true"
KAFKA_CFG_CONTROLLER_QUORUM_VOTERS: 0@kafka:9093
KAFKA_CFG_CONTROLLER_LISTENER_NAMES: CONTROLLER

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use base64::prelude::BASE64_STANDARD;
use base64::Engine;
#[allow(clippy::module_name_repetitions)]
pub fn check_basic_auth(auth_header: &str, expected_token: &str) -> bool {
let split = auth_header.split(' ').collect::<Vec<_>>();
if split.len() == 2 && split.first().map(|first| first.to_lowercase()) == Some("basic".into()) {
if let Ok(auth) = BASE64_STANDARD.decode(split.last().unwrap_or(&"")) {
if let Ok(auth) = String::from_utf8(auth) {
let split = auth.split(':').collect::<Vec<_>>();
if split.len() == 2 && split.first() == Some(&"token") {
match split.last() {
None => {}
Some(&token) => {
if let Ok(true) = bcrypt::verify(token, expected_token) {
return true;
}
}
}
}
}
}
}
false
}
#[cfg(test)]
mod tests {
use crate::auth::check_basic_auth;
// plain text value 'very-secret'
const EXPECTED_TOKEN: &str = "$2y$05$LIIFF4Rbi3iRVA4UIqxzPeTJ0NOn/cV2hDnSKFftAMzbEZRa42xSG";
#[test]
fn should_reject_non_basic_header_content() {
assert!(!check_basic_auth("token 123456789", EXPECTED_TOKEN));
}
#[test]
fn should_reject_invalid_basic_auth() {
assert!(!check_basic_auth("Basic 123456789", EXPECTED_TOKEN));
}
#[test]
fn should_reject_basic_auth_without_token_username() {
assert!(!check_basic_auth(
"Basic dXNlcjoxMjM0NTY3ODk=",
EXPECTED_TOKEN
));
}
#[test]
fn should_reject_basic_auth_without_wrong_token() {
assert!(!check_basic_auth(
"Basic dG9rZW46MTIzNDU2Nzg5",
EXPECTED_TOKEN
));
}
#[test]
fn should_accept_basic_auth_without_correct_token() {
assert!(check_basic_auth(
"Basic dG9rZW46dmVyeS1zZWNyZXQ=",
EXPECTED_TOKEN
));
}
}

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use clap::Parser;
#[derive(Parser)]
#[command(author, version, about)]
#[command(arg_required_else_help(true))]
pub struct Cli {
#[arg(
long,
alias = "kafka-servers",
env = "APP_KAFKA_SERVERS",
default_value = "kafka:9094",
help = "Kafka Bootstrap Server"
)]
pub bootstrap_server: String,
#[arg(
long,
alias = "kafka-topic",
env = "APP_KAFKA_TOPIC",
default_value = "etl-processor_input",
help = "Kafka Topic"
)]
pub topic: String,
#[arg(
long,
alias = "security-token",
env = "APP_SECURITY_TOKEN",
help = "bcrypt hashed Security Token"
)]
pub token: String,
#[arg(
long,
env = "APP_LISTEN",
default_value = "[::]:3000",
help = "Address and port for HTTP requests"
)]
pub listen: String,
}

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use axum::body::Body;
use axum::http::header::{AUTHORIZATION, CONTENT_TYPE};
use axum::http::{HeaderValue, Request, StatusCode};
use axum::middleware::{from_fn, Next};
use axum::response::{IntoResponse, Response};
use clap::Parser;
use serde::{Deserialize, Serialize};
use std::sync::{Arc, LazyLock};
#[cfg(debug_assertions)]
use tower_http::trace::TraceLayer;
use crate::cli::Cli;
use crate::routes::routes;
use crate::sender::DefaultMtbFileSender;
use crate::AppResponse::{Accepted, Unauthorized, UnsupportedContentType};
mod auth;
mod cli;
mod routes;
mod sender;
#[derive(Serialize, Deserialize)]
struct RecordKey {
#[serde(rename = "pid")]
patient_id: String,
}
enum AppResponse<'a> {
Accepted(&'a str),
Unauthorized,
InternalServerError,
UnsupportedContentType,
}
#[allow(clippy::expect_used)]
impl IntoResponse for AppResponse<'_> {
fn into_response(self) -> Response {
match self {
UnsupportedContentType => (
StatusCode::UNSUPPORTED_MEDIA_TYPE,
"This application accepts DNPM data model version 2.1 with content type 'application/json'"
).into_response(),
_ => match self {
Accepted(request_id) => Response::builder()
.status(StatusCode::ACCEPTED)
.header("X-Request-Id", request_id),
Unauthorized => Response::builder().status(StatusCode::UNAUTHORIZED),
_ => Response::builder().status(StatusCode::INTERNAL_SERVER_ERROR),
}
.body(Body::empty()).expect("response built"),
}
}
}
static CONFIG: LazyLock<Cli> = LazyLock::new(Cli::parse);
#[tokio::main]
async fn main() -> Result<(), ()> {
#[cfg(debug_assertions)]
{
tracing_subscriber::fmt()
.with_max_level(tracing::Level::DEBUG)
.init();
}
let sender = Arc::new(DefaultMtbFileSender::new(
&CONFIG.topic,
&CONFIG.bootstrap_server,
)?);
let routes = routes(sender)
.layer(from_fn(check_content_type_header))
.layer(from_fn(check_basic_auth));
#[cfg(debug_assertions)]
let routes = routes.layer(TraceLayer::new_for_http());
match tokio::net::TcpListener::bind(&CONFIG.listen).await {
Ok(listener) => {
log::info!("Starting application listening on '{}'", CONFIG.listen);
if let Err(err) = axum::serve(listener, routes).await {
log::error!("Error starting application: {err}");
}
}
Err(err) => log::error!("Error listening on '{}': {}", CONFIG.listen, err),
}
Ok(())
}
async fn check_content_type_header(request: Request<Body>, next: Next) -> Response {
match request
.headers()
.get(CONTENT_TYPE)
.map(HeaderValue::as_bytes)
{
Some(b"application/json" | b"application/json; charset=utf-8") => next.run(request).await,
_ => UnsupportedContentType.into_response(),
}
}
async fn check_basic_auth(request: Request<Body>, next: Next) -> Response {
if let Some(Ok(auth_header)) = request.headers().get(AUTHORIZATION).map(|x| x.to_str()) {
if auth::check_basic_auth(auth_header, &CONFIG.token) {
return next.run(request).await;
}
}
Unauthorized.into_response()
}
#[cfg(test)]
mod tests {
use axum::http::StatusCode;
use axum::response::IntoResponse;
use uuid::Uuid;
use crate::AppResponse::{Accepted, InternalServerError};
#[test]
fn should_return_success_response() {
let response = Accepted(&Uuid::new_v4().to_string()).into_response();
assert_eq!(response.status(), StatusCode::ACCEPTED);
assert!(response.headers().contains_key("x-request-id"));
}
#[test]
fn should_return_error_response() {
let response = InternalServerError.into_response();
assert_eq!(response.status(), StatusCode::INTERNAL_SERVER_ERROR);
assert!(!response.headers().contains_key("x-request-id"));
}
}

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use crate::sender::DynMtbFileSender;
use crate::AppResponse::{Accepted, InternalServerError};
use axum::extract::Path;
use axum::response::{IntoResponse, Response};
use axum::routing::{delete, post};
use axum::{Extension, Json, Router};
use mv64e_mtb_dto::Mtb;
pub async fn handle_delete(
Path(patient_id): Path<String>,
Extension(sender): Extension<DynMtbFileSender>,
) -> Response {
let delete_mtb_file = Mtb::new_with_consent_rejected(&patient_id);
match sender.send(delete_mtb_file).await {
Ok(request_id) => Accepted(&request_id).into_response(),
_ => InternalServerError.into_response(),
}
}
pub async fn handle_post(
Extension(sender): Extension<DynMtbFileSender>,
Json(mtb_file): Json<Mtb>,
) -> Response {
match sender.send(mtb_file).await {
Ok(request_id) => Accepted(&request_id).into_response(),
_ => InternalServerError.into_response(),
}
}
pub fn routes(sender: DynMtbFileSender) -> Router {
Router::new()
.route("/mtb/etl/patient-record", post(handle_post))
.route(
"/mtb/etl/patient-record/{patient_id}",
delete(handle_delete),
)
.layer(Extension(sender))
}
#[cfg(test)]
mod tests {
use super::*;
use crate::sender::MockMtbFileSender;
use axum::body::Body;
use axum::http::header::CONTENT_TYPE;
use axum::http::{Method, Request, StatusCode};
use std::sync::Arc;
use tower::ServiceExt;
#[tokio::test]
#[allow(clippy::expect_used)]
async fn should_handle_post_request() {
let mut sender_mock = MockMtbFileSender::new();
sender_mock
.expect_send()
.withf(|mtb| mtb.patient.id.eq("fae56ea7-24a7-4556-82fb-2b5dde71bb4d"))
.return_once(move |_| Ok(String::new()));
let router = routes(Arc::new(sender_mock) as DynMtbFileSender);
let body = Body::from(include_str!("../test-files/mv64e-mtb-fake-patient.json"));
let response = router
.oneshot(
Request::builder()
.method(Method::POST)
.uri("/mtb/etl/patient-record")
.header(CONTENT_TYPE, "application/json")
.body(body)
.expect("request built"),
)
.await
.unwrap();
assert_eq!(response.status(), StatusCode::ACCEPTED);
}
#[tokio::test]
#[allow(clippy::expect_used)]
async fn should_handle_delete_request() {
let mut sender_mock = MockMtbFileSender::new();
sender_mock
.expect_send()
// Expect patient id is set in Kafka record
.withf(|mtb| mtb.patient.id.eq("fae56ea7-24a7-4556-82fb-2b5dde71bb4d"))
// Expect no Metadata => no consent in kafka record
.withf(|mtb| mtb.metadata.is_none())
.return_once(move |_| Ok(String::new()));
let router = routes(Arc::new(sender_mock) as DynMtbFileSender);
let response = router
.oneshot(
Request::builder()
.method(Method::DELETE)
.uri("/mtb/etl/patient-record/fae56ea7-24a7-4556-82fb-2b5dde71bb4d")
.header(CONTENT_TYPE, "application/json")
.body(Body::empty())
.expect("request built"),
)
.await
.unwrap();
assert_eq!(response.status(), StatusCode::ACCEPTED);
}
}

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use async_trait::async_trait;
use mv64e_mtb_dto::Mtb;
use rdkafka::message::{Header, OwnedHeaders};
use rdkafka::producer::{FutureProducer, FutureRecord};
use rdkafka::ClientConfig;
use std::sync::Arc;
use std::time::Duration;
use uuid::Uuid;
#[cfg(test)]
use mockall::automock;
use crate::RecordKey;
pub type DynMtbFileSender = Arc<dyn MtbFileSender + Send + Sync>;
#[cfg_attr(test, automock)]
#[async_trait]
pub trait MtbFileSender {
async fn send(&self, mtb: Mtb) -> Result<String, ()>;
}
#[allow(clippy::module_name_repetitions)]
#[derive(Clone)]
pub struct DefaultMtbFileSender {
topic: String,
producer: FutureProducer,
}
impl DefaultMtbFileSender {
pub fn new(topic: &str, bootstrap_server: &str) -> Result<Self, ()> {
let producer = ClientConfig::new()
.set("bootstrap.servers", bootstrap_server)
.set("message.timeout.ms", "5000")
.create::<FutureProducer>()
.map_err(|_| ())?;
Ok(Self {
topic: topic.to_string(),
producer,
})
}
}
#[async_trait]
impl MtbFileSender for DefaultMtbFileSender {
async fn send(&self, mtb: Mtb) -> Result<String, ()> {
let request_id = Uuid::new_v4();
let record_key = RecordKey {
patient_id: mtb.patient.id.to_string(),
};
let record_headers = OwnedHeaders::default().insert(Header {
key: "requestId",
value: Some(&request_id.to_string()),
});
let record_key = serde_json::to_string(&record_key).map_err(|_| ())?;
match serde_json::to_string(&mtb) {
Ok(json) => {
self.producer
.send(
FutureRecord::to(&self.topic)
.key(&record_key)
.headers(record_headers)
.payload(&json),
Duration::from_secs(1),
)
.await
.map_err(|_| ())
.map(|_| ())?;
Ok(request_id.to_string())
}
Err(_) => Err(()),
}
}
}

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