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… that is, support converting Kafka messages into Svix API calls.
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[package] | ||
name = "svix-bridge-plugin-kafka" | ||
version = "0.1.0" | ||
edition = "2021" | ||
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[dependencies] | ||
rdkafka = { version = "0.36.0", features = ["cmake-build", "ssl", "tracing"] } | ||
serde = { version = "1.0", features = ["derive"] } | ||
serde_json = "1.0.117" | ||
svix-bridge-types = { path = "../svix-bridge-types" } | ||
thiserror = "1.0.61" | ||
tokio = { version = "1.28.1", features = ["time"] } | ||
tracing = "0.1.40" | ||
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[dev-dependencies] | ||
ctor = "0.2.8" | ||
tracing-subscriber = { version = "0.3.18", features = ["env-filter"] } | ||
wiremock = "0.5.18" |
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Copyright (c) 2024 Svix Inc. | ||
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Permission is hereby granted, free of charge, to any person obtaining | ||
a copy of this software and associated documentation files (the | ||
"Software"), to deal in the Software without restriction, including | ||
without limitation the rights to use, copy, modify, merge, publish, | ||
distribute, sublicense, and/or sell copies of the Software, and to | ||
permit persons to whom the Software is furnished to do so, subject to | ||
the following conditions: | ||
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The above copyright notice and this permission notice shall be | ||
included in all copies or substantial portions of the Software. | ||
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | ||
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | ||
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | ||
NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE | ||
LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION | ||
OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION | ||
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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use rdkafka::{consumer::StreamConsumer, error::KafkaResult, ClientConfig}; | ||
use serde::Deserialize; | ||
use svix_bridge_types::{SenderInput, SenderOutputOpts, TransformationConfig}; | ||
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use crate::{input::KafkaConsumer, Result}; | ||
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#[derive(Clone, Deserialize)] | ||
pub struct KafkaInputOpts { | ||
/// Comma-separated list of addresses. | ||
/// | ||
/// Example: `localhost:9094` | ||
#[serde(rename = "kafka_bootstrap_brokers")] | ||
pub bootstrap_brokers: String, | ||
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/// The consumer group ID, used to track the stream offset between restarts | ||
/// (due to host maintenance, upgrades, crashes, etc.). | ||
#[serde(rename = "kafka_group_id")] | ||
pub group_id: String, | ||
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/// The topic to listen to. | ||
#[serde(rename = "kafka_topic")] | ||
pub topic: String, | ||
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/// The value for 'security.protocol' in the kafka config. | ||
#[serde(flatten)] | ||
pub security_protocol: KafkaSecurityProtocol, | ||
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/// The 'debug' config value for rdkafka - enables more verbose logging | ||
/// for the selected 'contexts' | ||
#[serde(rename = "kafka_debug_contexts")] | ||
pub debug_contexts: Option<String>, | ||
} | ||
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impl KafkaInputOpts { | ||
pub(crate) fn create_consumer(self) -> KafkaResult<StreamConsumer> { | ||
let mut config = ClientConfig::new(); | ||
config | ||
.set("group.id", self.group_id) | ||
.set("bootstrap.servers", self.bootstrap_brokers) | ||
// messages are committed manually after webhook delivery was successful. | ||
.set("enable.auto.commit", "false"); | ||
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match self.security_protocol { | ||
KafkaSecurityProtocol::Plaintext => { | ||
config.set("security.protocol", "plaintext"); | ||
} | ||
KafkaSecurityProtocol::Ssl => { | ||
config.set("security.protocol", "ssl"); | ||
} | ||
KafkaSecurityProtocol::SaslSsl { | ||
sasl_username, | ||
sasl_password, | ||
} => { | ||
config | ||
.set("security.protocol", "sasl_ssl") | ||
.set("sasl.mechanisms", "SCRAM-SHA-512") | ||
.set("sasl.username", sasl_username) | ||
.set("sasl.password", sasl_password); | ||
} | ||
} | ||
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if let Some(debug_contexts) = self.debug_contexts { | ||
if !debug_contexts.is_empty() { | ||
config.set("debug", debug_contexts); | ||
} | ||
} | ||
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config.create() | ||
} | ||
} | ||
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#[derive(Clone, Debug, Deserialize)] | ||
#[serde(tag = "kafka_security_protocol", rename_all = "snake_case")] | ||
pub enum KafkaSecurityProtocol { | ||
Plaintext, | ||
Ssl, | ||
SaslSsl { | ||
#[serde(rename = "kafka_sasl_username")] | ||
sasl_username: String, | ||
#[serde(rename = "kafka_sasl_password")] | ||
sasl_password: String, | ||
}, | ||
} | ||
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pub fn into_sender_input( | ||
name: String, | ||
opts: KafkaInputOpts, | ||
transformation: Option<TransformationConfig>, | ||
output: SenderOutputOpts, | ||
) -> Result<Box<dyn SenderInput>> { | ||
Ok(Box::new(KafkaConsumer::new( | ||
name, | ||
opts, | ||
transformation, | ||
output, | ||
)?)) | ||
} |
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use std::str; | ||
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use rdkafka::error::KafkaError; | ||
use svix_bridge_types::svix::error::Error as SvixClientError; | ||
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#[derive(Debug, thiserror::Error)] | ||
pub enum Error { | ||
#[error("kafka error")] | ||
Kafka(#[from] KafkaError), | ||
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#[error("svix client error")] | ||
SvixClient(#[from] SvixClientError), | ||
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#[error("JSON deserialization failed")] | ||
Deserialization(#[source] serde_json::Error), | ||
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#[error("non-UTF8 payload")] | ||
NonUtf8Payload(#[source] str::Utf8Error), | ||
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#[error("kafka message is missing payload")] | ||
MissingPayload, | ||
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#[error("transformation error: {error}")] | ||
Transformation { error: String }, | ||
} | ||
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impl Error { | ||
pub(crate) fn transformation(error: impl Into<String>) -> Self { | ||
Self::Transformation { | ||
error: error.into(), | ||
} | ||
} | ||
} | ||
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pub type Result<T, E = Error> = std::result::Result<T, E>; |
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