brian/mqtt2db
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Support JSON in MQTT payloads

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The imeptus for this is to allow embedding an event timestamp with the
data, since MQTT doesn't tag messages with the time they were sent.  So
Instead of having a payload value like "some value", you could have:

{
    "timestamp": 1630360029124,
    "value": "some value"
}

... and then configure the mapping in mqtt2db to be a JSON mapping, with
timestamp field name "timestamp" and value field name "value", and we
just figure things out.

If no mapping payload type is specified, we just assume it's a raw value
as before.
This commit is contained in:
Brian Tarricone
2021-08-30 14:46:11 -07:00
parent 0b95f5bf7c
commit 2984561a9a
6 changed files with 109 additions and 19 deletions
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9
src/mapping.rs
View File

@ -1,9 +1,9 @@
use influxdb::Type;
use std::convert::TryFrom;
use crate::config::{Mapping as ConfigMapping, TagValue as ConfigTagValue};
use crate::config::{Mapping as ConfigMapping, Payload, TagValue as ConfigTagValue};
use crate::interpolate::{InterpolatedName, InterpolatedNamePart};
use crate::value::ValueType;
use crate::value::{ToInfluxType, ValueType};
#[derive(Clone, Debug, PartialEq)]
pub enum TopicLevel {
@ -45,7 +45,7 @@ impl TryFrom<&ConfigTagValue> for TagValue {
_ => Ok(TagValue::InterpolatedStr(interp)),
}
}
other => other.parse(&tag_value.value).map(TagValue::Literal),
other => tag_value.value.to_influx_type(other).map(TagValue::Literal),
}
}
}
@ -53,6 +53,7 @@ impl TryFrom<&ConfigTagValue> for TagValue {
#[derive(Debug)]
pub struct Mapping {
pub topic: Vec<TopicLevel>,
pub payload: Option<Payload>,
pub field_name: InterpolatedName,
pub value_type: ValueType,
pub tags: Vec<(String, TagValue)>,
@ -108,6 +109,7 @@ impl TryFrom<&ConfigMapping> for Mapping {
Ok(Mapping {
topic,
payload: mapping.payload.as_ref().map(|p| p.clone()),
field_name,
value_type: mapping.value_type,
tags,
@ -135,6 +137,7 @@ mod test {
fn mk_cfg_mapping(topic: &str) -> ConfigMapping {
ConfigMapping {
topic: topic.to_string(),
payload: None,
field_name: "".to_string(),
value_type: ValueType::Text,
tags: HashMap::new(),