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use crate::core::{converter::*, error::*, size_threshold::SizeThreshold};
use async_trait::async_trait;
use clock::Clock;
use mqtt_channel::{Message, TopicFilter};
use thin_edge_json::serialize::ThinEdgeJsonSerializer;
pub struct AzureConverter {
pub(crate) add_timestamp: bool,
pub(crate) clock: Box<dyn Clock>,
pub(crate) size_threshold: SizeThreshold,
pub(crate) mapper_config: MapperConfig,
}
impl AzureConverter {
pub fn new(add_timestamp: bool, clock: Box<dyn Clock>, size_threshold: SizeThreshold) -> Self {
let mapper_config = MapperConfig {
in_topic_filter: Self::in_topic_filter(),
out_topic: make_valid_topic_or_panic("az/messages/events/"),
errors_topic: make_valid_topic_or_panic("tedge/errors"),
};
AzureConverter {
add_timestamp,
clock,
size_threshold,
mapper_config,
}
}
pub fn in_topic_filter() -> TopicFilter {
make_valid_topic_filter_or_panic("tedge/measurements")
}
}
#[async_trait]
impl Converter for AzureConverter {
type Error = ConversionError;
fn get_mapper_config(&self) -> &MapperConfig {
&self.mapper_config
}
async fn try_convert(&mut self, input: &Message) -> Result<Vec<Message>, Self::Error> {
let () = self.size_threshold.validate(input)?;
let default_timestamp = self.add_timestamp.then(|| self.clock.now());
let mut serializer = ThinEdgeJsonSerializer::new_with_timestamp(default_timestamp);
let () = thin_edge_json::parser::parse_str(input.payload_str()?, &mut serializer)?;
let payload = serializer.into_string()?;
Ok(vec![(Message::new(&self.mapper_config.out_topic, payload))])
}
}
#[cfg(test)]
mod tests {
use crate::{
az::converter::AzureConverter,
core::{converter::*, error::ConversionError, size_threshold::SizeThreshold},
};
use assert_json_diff::*;
use assert_matches::*;
use clock::Clock;
use mqtt_channel::{Message, Topic};
use serde_json::json;
use time::macros::datetime;
struct TestClock;
impl Clock for TestClock {
fn now(&self) -> clock::Timestamp {
datetime!(2021-04-08 00:00:00 +05:00)
}
}
#[tokio::test]
async fn converting_invalid_json_is_invalid() {
let mut converter =
AzureConverter::new(false, Box::new(TestClock), SizeThreshold(255 * 1024));
let input = "This is not Thin Edge JSON";
let result = converter.try_convert(&new_tedge_message(input)).await;
assert_matches!(result, Err(ConversionError::FromThinEdgeJsonParser(_)))
}
fn new_tedge_message(input: &str) -> Message {
Message::new(&Topic::new_unchecked("tedge/measurements"), input)
}
fn extract_first_message_payload(mut messages: Vec<Message>) -> String {
messages.pop().unwrap().payload_str().unwrap().to_string()
}
#[tokio::test]
async fn converting_input_without_timestamp_produces_output_without_timestamp_given_add_timestamp_is_false(
) {
let mut converter =
AzureConverter::new(false, Box::new(TestClock), SizeThreshold(255 * 1024));
let input = r#"{
"temperature": 23.0
}"#;
let expected_output = json!({
"temperature": 23.0
});
let output = converter.convert(&new_tedge_message(input)).await;
assert_json_eq!(
serde_json::from_str::<serde_json::Value>(&extract_first_message_payload(output))
.unwrap(),
expected_output
);
}
#[tokio::test]
async fn converting_input_with_timestamp_produces_output_with_timestamp_given_add_timestamp_is_false(
) {
let mut converter =
AzureConverter::new(false, Box::new(TestClock), SizeThreshold(255 * 1024));
let input = r#"{
"time" : "2013-06-22T17:03:14.000+02:00",
"temperature": 23.0
}"#;
let expected_output = json!({
"time" : "2013-06-22T17:03:14+02:00",
"temperature": 23.0
});
let output = converter.convert(&new_tedge_message(input)).await;
assert_json_eq!(
serde_json::from_str::<serde_json::Value>(&extract_first_message_payload(output))
.unwrap(),
expected_output
);
}
#[tokio::test]
async fn converting_input_with_timestamp_produces_output_with_timestamp_given_add_timestamp_is_true(
) {
let mut converter =
AzureConverter::new(true, Box::new(TestClock), SizeThreshold(255 * 1024));
let input = r#"{
"time" : "2013-06-22T17:03:14.000+02:00",
"temperature": 23.0
}"#;
let expected_output = json!({
"time" : "2013-06-22T17:03:14+02:00",
"temperature": 23.0
});
let output = converter.convert(&new_tedge_message(input)).await;
assert_json_eq!(
serde_json::from_str::<serde_json::Value>(&extract_first_message_payload(output))
.unwrap(),
expected_output
);
}
#[tokio::test]
async fn converting_input_without_timestamp_produces_output_with_timestamp_given_add_timestamp_is_true(
) {
let mut converter =
AzureConverter::new(true, Box::new(TestClock), SizeThreshold(255 * 1024));
let input = r#"{
"temperature": 23.0
}"#;
let expected_output = json!({
"temperature": 23.0,
"time": "2021-04-08T00:00:00+05:00"
});
let output = converter.convert(&new_tedge_message(input)).await;
assert_json_eq!(
serde_json::from_str::<serde_json::Value>(&extract_first_message_payload(output))
.unwrap(),
expected_output
);
}
#[tokio::test]
async fn exceeding_threshold_returns_error() {
let mut converter = AzureConverter::new(false, Box::new(TestClock), SizeThreshold(1));
let _topic = "tedge/measurements".to_string();
let input = "ABC";
let result = converter.try_convert(&new_tedge_message(input)).await;
assert_matches!(
result,
Err(ConversionError::SizeThresholdExceeded {
topic: _topic,
actual_size: 3,
threshold: 1
})
);
}
}
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