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use crate::routing_rules::{CloudEventFields, RoutingRules, RoutingTable};
use cerk::kernel::{BrokerEvent, Config, IncomingCloudEvent, OutgoingCloudEvent, RoutingResult};
use cerk::runtime::channel::{BoxedReceiver, BoxedSender};
use cerk::runtime::{InternalServerFn, InternalServerFnRefStatic, InternalServerId};
use cloudevents::{AttributesReader, Event};
use serde_json;
use serde_json::error::Error as SerdeErrorr;
fn compare_field<F>(field: &CloudEventFields, cloud_event: &Event, compare: F) -> bool
where
F: for<'a> Fn(Option<&'a str>) -> bool,
{
match field {
CloudEventFields::Id => compare(Some(cloud_event.id())),
CloudEventFields::Source => compare(Some(cloud_event.source().as_str())),
CloudEventFields::Subject => cloud_event
.subject()
.and_then(|s| Some(compare(Some(s))))
.unwrap_or_else(|| false),
CloudEventFields::Dataschema => compare(cloud_event.dataschema().map(|s| s.as_str())),
CloudEventFields::Type => compare(Some(cloud_event.ty())),
}
}
fn route_to_port(rules: &RoutingRules, cloud_event: &Event) -> bool {
match rules {
RoutingRules::And(rules) => rules.iter().all(|rule| route_to_port(rule, cloud_event)),
RoutingRules::Or(rules) => rules.iter().any(|rule| route_to_port(rule, cloud_event)),
RoutingRules::Exact(field, value) => compare_field(field, cloud_event, |field| {
field == value.as_ref().map(|s| &**s)
}),
RoutingRules::Contains(field, value) => compare_field(field, cloud_event, |field| {
field.map_or(false, |f| f.contains(value.as_str()))
}),
RoutingRules::StartsWith(field, value) => compare_field(field, cloud_event, |field| {
field.map_or(false, |f| f.starts_with(value.as_str()))
}),
RoutingRules::EndsWith(field, value) => compare_field(field, cloud_event, |field| {
field.map_or(false, |f| f.ends_with(value.as_str()))
}),
}
}
fn route_event(
event: IncomingCloudEvent,
sender_to_kernel: &BoxedSender,
port_config: &RoutingTable,
) {
let IncomingCloudEvent {
cloud_event,
routing_id,
incoming_id,
args,
} = event;
let routing: Vec<_> = port_config
.iter()
.filter(|(_, rules)| route_to_port(rules, &cloud_event))
.map(|(port_id, _)| OutgoingCloudEvent {
routing_id: routing_id.clone(),
cloud_event: cloud_event.clone(),
destination_id: port_id.clone(),
args: args.clone(),
})
.collect();
sender_to_kernel.send(BrokerEvent::RoutingResult(RoutingResult {
routing_id,
incoming_id,
routing,
args,
}))
}
fn parse_config(config_update: String) -> Result<RoutingTable, SerdeErrorr> {
serde_json::from_str::<RoutingTable>(&config_update)
}
pub fn router_start(id: InternalServerId, inbox: BoxedReceiver, sender_to_kernel: BoxedSender) {
info!("start broadcast router with id {}", id);
let mut config: Option<RoutingTable> = None;
loop {
match inbox.receive() {
BrokerEvent::Init => info!("{} initiated", id),
BrokerEvent::IncomingCloudEvent(event) => {
if let Some(config) = config.as_ref() {
route_event(event, &sender_to_kernel, config);
} else {
error!("No configs defined yet, event will be droped");
}
}
BrokerEvent::ConfigUpdated(updated_config, _) => {
if let Config::String(string_config) = updated_config {
match parse_config(string_config) {
Ok(parsed_config) => config = Some(parsed_config),
Err(err) => panic!("was not able to parse configs {:?}", err),
}
}
}
broker_event => warn!("event {} not implemented", broker_event),
}
}
}
pub static ROUTER_RULE_BASED: InternalServerFnRefStatic = &(router_start as InternalServerFn);
#[cfg(test)]
mod tests {
use super::*;
use crate::routing_rules::{CloudEventFields, RoutingRules};
use cloudevents::{EventBuilder, EventBuilderV10};
#[test]
fn rout_to_port_by_id() {
let rule = RoutingRules::Exact(CloudEventFields::Id, Some("1234".to_string()));
assert!(route_to_port(
&rule,
&EventBuilderV10::new()
.id("1234")
.ty("test type")
.source("http://example.com/testi")
.build()
.unwrap(),
));
assert!(!route_to_port(
&rule,
&EventBuilderV10::new()
.id("12345")
.ty("test type")
.source("http://example.com/testi")
.build()
.unwrap(),
));
}
#[test]
fn rout_to_port_by_type_and_source() {
let rule = RoutingRules::And(vec![
RoutingRules::StartsWith(CloudEventFields::Type, "testtype".to_string()),
RoutingRules::Contains(CloudEventFields::Source, "testsource".to_string()),
]);
assert!(route_to_port(
&rule,
&EventBuilderV10::new()
.id("1")
.ty("testtype1")
.source("http://example.com/1testsource1")
.build()
.unwrap(),
));
assert!(!route_to_port(
&rule,
&EventBuilderV10::new()
.id("1")
.ty("1testtype")
.source("http://example.com/1test1source1")
.build()
.unwrap(),
));
}
}