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This commit is contained in:
Brian Tarricone
2022-06-08 15:36:08 -07:00
parent a3c2f84223
commit fa2542f361
7 changed files with 63 additions and 87 deletions
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1
Cargo.lock generated
View File

@@ -1040,6 +1040,7 @@ dependencies = [
name = "mqtt2db" name = "mqtt2db"
version = "0.1.0" version = "0.1.0"
dependencies = [ dependencies = [
"anyhow",
"chrono", "chrono",
"env_logger", "env_logger",
"futures", "futures",

3
Cargo.toml
View File

@@ -2,9 +2,10 @@
name = "mqtt2db" name = "mqtt2db"
version = "0.1.0" version = "0.1.0"
authors = ["Brian J. Tarricone <brian@tarricone.org>"] authors = ["Brian J. Tarricone <brian@tarricone.org>"]
edition = "2018" edition = "2021"
[dependencies] [dependencies]
anyhow = "1"
chrono = { version = "0.4", features = ["serde"] } chrono = { version = "0.4", features = ["serde"] }
env_logger = "0.9" env_logger = "0.9"
futures = "0.3" futures = "0.3"

9
src/config.rs
View File

@@ -86,12 +86,11 @@ pub struct Config {
} }
impl Config { impl Config {
pub fn parse<P: AsRef<Path>>(filename: P) -> Result<Config, String> { pub fn parse<P: AsRef<Path>>(filename: P) -> anyhow::Result<Config> {
let mut f = File::open(filename).map_err(|err| err.to_string())?; let mut f = File::open(filename)?;
let mut contents = String::new(); let mut contents = String::new();
f.read_to_string(&mut contents) f.read_to_string(&mut contents)?;
.map_err(|err| err.to_string())?; let config: Config = from_str(&contents)?;
let config: Config = from_str(&contents).map_err(|err| err.to_string())?;
Ok(config) Ok(config)
} }
} }

20
src/interpolate.rs
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@@ -19,8 +19,8 @@ pub enum InterpolatedNamePart {
} }
impl TryFrom<&str> for InterpolatedName { impl TryFrom<&str> for InterpolatedName {
type Error = String; type Error = anyhow::Error;
fn try_from(s: &str) -> Result<InterpolatedName, String> { fn try_from(s: &str) -> Result<InterpolatedName, Self::Error> {
let mut parts: Vec<InterpolatedNamePart> = Vec::new(); let mut parts: Vec<InterpolatedNamePart> = Vec::new();
let mut n_references: usize = 0; let mut n_references: usize = 0;
let mut pos: usize = 0; let mut pos: usize = 0;
@@ -28,7 +28,7 @@ impl TryFrom<&str> for InterpolatedName {
for cap in REFERENCE_RE.captures_iter(s) { for cap in REFERENCE_RE.captures_iter(s) {
let mat = cap let mat = cap
.get(2) .get(2)
.ok_or_else(|| format!("Unable to get full match for name '{}'", s))?; .ok_or_else(|| anyhow!("Unable to get full match for name '{}'", s))?;
if pos < mat.start() { if pos < mat.start() {
parts.push(InterpolatedNamePart::Literal( parts.push(InterpolatedNamePart::Literal(
s.chars() s.chars()
@@ -42,12 +42,12 @@ impl TryFrom<&str> for InterpolatedName {
let num_str = cap let num_str = cap
.get(3) .get(3)
.map(|mat1| mat1.as_str()) .map(|mat1| mat1.as_str())
.ok_or_else(|| format!("Unable to get capture group for name '{}'", s))?; .ok_or_else(|| anyhow!("Unable to get capture group for name '{}'", s))?;
let num = num_str let num = num_str
.parse::<usize>() .parse::<usize>()
.map_err(|_| format!("Couldn't parse '{}' as number for name '{}'", num_str, s))?; .map_err(|_| anyhow!("Couldn't parse '{}' as number for name '{}'", num_str, s))?;
if num == 0 { if num == 0 {
Err(format!("Invalid reference number 0 for name '{}'", s))?; Err(anyhow!("Invalid reference number 0 for name '{}'", s))?;
} }
parts.push(InterpolatedNamePart::Reference(num)); parts.push(InterpolatedNamePart::Reference(num));
n_references += 1; n_references += 1;
@@ -69,7 +69,7 @@ impl TryFrom<&str> for InterpolatedName {
} }
impl InterpolatedName { impl InterpolatedName {
pub fn interpolate<S: AsRef<str>>(&self, reference_values: &Vec<S>) -> Result<String, String> { pub fn interpolate<S: AsRef<str>>(&self, reference_values: &Vec<S>) -> anyhow::Result<String> {
self.parts self.parts
.iter() .iter()
.fold(Ok(String::new()), |accum, part| match accum { .fold(Ok(String::new()), |accum, part| match accum {
@@ -83,7 +83,7 @@ impl InterpolatedName {
accum.push_str(reference_value.as_ref()); accum.push_str(reference_value.as_ref());
Ok(accum) Ok(accum)
} }
None => Err(format!( None => Err(anyhow!(
"Can't find reference number {} to interpolate", "Can't find reference number {} to interpolate",
num num
)), )),
@@ -99,7 +99,7 @@ mod test {
use super::*; use super::*;
#[test] #[test]
fn interpolated_name_parsing() -> Result<(), String> { fn interpolated_name_parsing() -> anyhow::Result<()> {
use InterpolatedNamePart::*; use InterpolatedNamePart::*;
assert_eq!( assert_eq!(
@@ -135,7 +135,7 @@ mod test {
} }
#[test] #[test]
fn interpolation() -> Result<(), String> { fn interpolation() -> anyhow::Result<()> {
let interp = InterpolatedName::try_from("foo$1bar$2 baz $1")?; let interp = InterpolatedName::try_from("foo$1bar$2 baz $1")?;
assert_eq!( assert_eq!(
"foofirstbarsecond baz first".to_string(), "foofirstbarsecond baz first".to_string(),

71
src/main.rs
View File

@@ -1,8 +1,9 @@
#[macro_use] #[macro_use]
extern crate anyhow;
#[macro_use]
extern crate log; extern crate log;
use config::{Config, Database as ConfigDatabase, MqttAuth, MqttConfig, UserAuth}; use config::{Config, Database as ConfigDatabase, MqttAuth, MqttConfig, UserAuth};
use futures::TryFutureExt;
use influxdb::InfluxDbWriteable; use influxdb::InfluxDbWriteable;
use influxdb::{Client as InfluxClient, Timestamp, Type}; use influxdb::{Client as InfluxClient, Timestamp, Type};
use mapping::{Mapping, Payload, TagValue, TopicLevel}; use mapping::{Mapping, Payload, TagValue, TopicLevel};
@@ -13,11 +14,9 @@ use rumqttc::{
use serde_json::Value as JsonValue; use serde_json::Value as JsonValue;
use std::convert::TryFrom; use std::convert::TryFrom;
use std::env; use std::env;
use std::path::Path;
use std::sync::Arc; use std::sync::Arc;
use std::time::{SystemTime, UNIX_EPOCH}; use std::time::{SystemTime, UNIX_EPOCH};
use tokio::fs::File; use tokio::fs;
use tokio::io::AsyncReadExt;
use value::ToInfluxType; use value::ToInfluxType;
mod config; mod config;
@@ -30,31 +29,8 @@ struct Database {
measurement: String, measurement: String,
} }
async fn init_mqtt(config: &MqttConfig) -> Result<(MqttAsyncClient, MqttEventLoop), String> { async fn init_mqtt(config: &MqttConfig) -> anyhow::Result<(MqttAsyncClient, MqttEventLoop)> {
async fn file_to_bytevec<P: AsRef<Path>>(file: P) -> Result<Vec<u8>, String> { let mut options = MqttOptions::new(&config.client_id, &config.host, config.port);
let mut f = File::open(&file)
.map_err(|err| {
format!(
"Unable to open {}: {}",
file.as_ref().to_string_lossy(),
err
)
})
.await?;
let mut buf = Vec::new();
f.read_to_end(&mut buf)
.map_err(|err| {
format!(
"Unable to read {}: {}",
file.as_ref().to_string_lossy(),
err
)
})
.await?;
Ok(buf)
}
let mut options = MqttOptions::new(config.client_id.clone(), config.host.clone(), config.port);
if let Some(connect_timeout) = config.connect_timeout { if let Some(connect_timeout) = config.connect_timeout {
options.set_connection_timeout(connect_timeout.as_secs()); options.set_connection_timeout(connect_timeout.as_secs());
} }
@@ -62,7 +38,7 @@ async fn init_mqtt(config: &MqttConfig) -> Result<(MqttAsyncClient, MqttEventLoo
options.set_keep_alive(keep_alive); options.set_keep_alive(keep_alive);
} }
if let Some(ca_file) = &config.ca_file { if let Some(ca_file) = &config.ca_file {
let ca = file_to_bytevec(ca_file).await?; let ca = fs::read(ca_file).await?;
options.set_transport(Transport::Tls(TlsConfiguration::Simple { options.set_transport(Transport::Tls(TlsConfiguration::Simple {
ca, ca,
alpn: None, alpn: None,
@@ -71,8 +47,8 @@ async fn init_mqtt(config: &MqttConfig) -> Result<(MqttAsyncClient, MqttEventLoo
private_key_file, private_key_file,
}) = &config.auth }) = &config.auth
{ {
let cert = file_to_bytevec(cert_file).await?; let cert = fs::read(cert_file).await?;
let private_key = file_to_bytevec(private_key_file).await?; let private_key = fs::read(private_key_file).await?;
Some((cert, Key::RSA(private_key))) Some((cert, Key::RSA(private_key)))
} else { } else {
None None
@@ -87,10 +63,10 @@ async fn init_mqtt(config: &MqttConfig) -> Result<(MqttAsyncClient, MqttEventLoo
Ok(MqttAsyncClient::new(options, 100)) Ok(MqttAsyncClient::new(options, 100))
} }
fn init_db(config: &ConfigDatabase) -> Result<Database, String> { fn init_db(config: &ConfigDatabase) -> anyhow::Result<Database> {
match config { match config {
ConfigDatabase::Influxdb { url, auth, db_name, measurement } => { ConfigDatabase::Influxdb { url, auth, db_name, measurement } => {
let mut client = InfluxClient::new(url.clone(), db_name.clone()); let mut client = InfluxClient::new(url, db_name);
if let Some(UserAuth { username, password }) = auth { if let Some(UserAuth { username, password }) = auth {
client = client.with_auth(username, password); client = client.with_auth(username, password);
} }
@@ -105,7 +81,7 @@ fn init_db(config: &ConfigDatabase) -> Result<Database, String> {
async fn init_subscriptions( async fn init_subscriptions(
mqtt_client: &mut MqttAsyncClient, mqtt_client: &mut MqttAsyncClient,
topics: &Vec<&String>, topics: &Vec<&String>,
) -> Result<(), String> { ) -> anyhow::Result<()> {
let topics: Vec<SubscribeFilter> = topics let topics: Vec<SubscribeFilter> = topics
.iter() .iter()
.map(|topic| { .map(|topic| {
@@ -115,8 +91,7 @@ async fn init_subscriptions(
.collect(); .collect();
mqtt_client mqtt_client
.subscribe_many(topics) .subscribe_many(topics)
.await .await?;
.map_err(|err| err.to_string())?;
Ok(()) Ok(())
} }
@@ -124,7 +99,7 @@ async fn handle_publish(
publish: &Publish, publish: &Publish,
mapping: Arc<Mapping>, mapping: Arc<Mapping>,
databases: Arc<Vec<Database>>, databases: Arc<Vec<Database>>,
) -> Result<(), String> { ) -> anyhow::Result<()> {
debug!("Got publish: {:?}; {:?}", publish, publish.payload); debug!("Got publish: {:?}; {:?}", publish, publish.payload);
let reference_values = publish let reference_values = publish
@@ -139,27 +114,27 @@ async fn handle_publish(
let field_name = mapping.field_name.interpolate(&reference_values)?; let field_name = mapping.field_name.interpolate(&reference_values)?;
let payload = String::from_utf8(Vec::from(publish.payload.as_ref())) let payload = String::from_utf8(Vec::from(publish.payload.as_ref()))
.map_err(|err| format!("Invalid payload value: {}", err))?; .map_err(|err| anyhow!("Invalid payload value: {}", err))?;
let (influx_value, timestamp) = match &mapping.payload { let (influx_value, timestamp) = match &mapping.payload {
Payload::Raw => (payload.to_influx_type(mapping.value_type)?, None), Payload::Raw => (payload.to_influx_type(mapping.value_type)?, None),
Payload::Json { value_field_selector, timestamp_field_selector } => { Payload::Json { value_field_selector, timestamp_field_selector } => {
let payload_root: JsonValue = serde_json::from_str(&payload) let payload_root: JsonValue = serde_json::from_str(&payload)
.map_err(|err| format!("Failed to parse payload as JSON: {}", err))?; .map_err(|err| anyhow!("Failed to parse payload as JSON: {}", err))?;
let influx_value = value_field_selector let influx_value = value_field_selector
.find(&payload_root) .find(&payload_root)
.next() .next()
.ok_or_else(|| format!("Couldn't find value in payload on topic {}", publish.topic)) .ok_or_else(|| anyhow!("Couldn't find value in payload on topic {}", publish.topic))
.and_then(|value| value.to_influx_type(mapping.value_type))?; .and_then(|value| value.to_influx_type(mapping.value_type))?;
let timestamp = timestamp_field_selector let timestamp = timestamp_field_selector
.as_ref() .as_ref()
.map(|selector| selector .map(|selector| selector
.find(&payload_root) .find(&payload_root)
.next() .next()
.ok_or_else(|| format!("Couldn't find timestamp in payload on topic {}", publish.topic)) .ok_or_else(|| anyhow!("Couldn't find timestamp in payload on topic {}", publish.topic))
.and_then(|ts_value| ts_value .and_then(|ts_value| ts_value
.as_u64() .as_u64()
.map(|ts| ts as u128) .map(|ts| ts as u128)
.ok_or_else(|| format!("'{}' cannot be converted to a timestamp", ts_value)) .ok_or_else(|| anyhow!("'{}' cannot be converted to a timestamp", ts_value))
) )
) )
.transpose()?; .transpose()?;
@@ -189,7 +164,7 @@ async fn handle_publish(
.client .client
.query(&query) .query(&query)
.await .await
.map_err(|err| format!("Failed to write to DB: {}", err))?; .map_err(|err| anyhow!("Failed to write to DB: {}", err))?;
debug!("wrote to influx: {:?}", query); debug!("wrote to influx: {:?}", query);
} }
@@ -247,10 +222,10 @@ async fn run_event_loop(
} }
#[tokio::main] #[tokio::main]
async fn main() -> Result<(), String> { async fn main() -> anyhow::Result<()> {
let config_filename = env::args() let config_filename = env::args()
.nth(1) .nth(1)
.ok_or_else(|| "Missing argument 'config filename'")?; .ok_or_else(|| anyhow!("Missing argument 'config filename'"))?;
let config = Config::parse(&config_filename)?; let config = Config::parse(&config_filename)?;
let logger_env = env_logger::Env::new() let logger_env = env_logger::Env::new()
@@ -266,7 +241,7 @@ async fn main() -> Result<(), String> {
.mappings .mappings
.iter() .iter()
.map(Mapping::try_from) .map(Mapping::try_from)
.collect::<Result<Vec<Mapping>, String>>()?; .collect::<anyhow::Result<Vec<Mapping>>>()?;
let (mut mqtt_client, mqtt_event_loop) = init_mqtt(&config.mqtt).await?; let (mut mqtt_client, mqtt_event_loop) = init_mqtt(&config.mqtt).await?;
init_subscriptions( init_subscriptions(
@@ -282,7 +257,7 @@ async fn main() -> Result<(), String> {
let databases = config.databases let databases = config.databases
.iter() .iter()
.map(init_db) .map(init_db)
.collect::<Result<Vec<Database>, String>>()?; .collect::<anyhow::Result<Vec<Database>>>()?;
run_event_loop(mqtt_event_loop, mappings, databases).await; run_event_loop(mqtt_event_loop, mappings, databases).await;

24
src/mapping.rs
View File

@@ -14,13 +14,13 @@ pub enum TopicLevel {
} }
impl TryFrom<&str> for TopicLevel { impl TryFrom<&str> for TopicLevel {
type Error = String; type Error = anyhow::Error;
fn try_from(s: &str) -> Result<Self, Self::Error> { fn try_from(s: &str) -> Result<Self, Self::Error> {
match s { match s {
"+" => Ok(TopicLevel::SingleWildcard), "+" => Ok(TopicLevel::SingleWildcard),
"#" => Ok(TopicLevel::MultiWildcard), "#" => Ok(TopicLevel::MultiWildcard),
s if s.contains("+") || s.contains("#") => { s if s.contains("+") || s.contains("#") => {
Err(format!("Topic level '{}' cannot contain '+' or '#'", s)) Err(anyhow!("Topic level '{}' cannot contain '+' or '#'", s))
} }
s => Ok(TopicLevel::Literal(s.to_string())), s => Ok(TopicLevel::Literal(s.to_string())),
} }
@@ -34,7 +34,7 @@ pub enum TagValue {
} }
impl TryFrom<&ConfigTagValue> for TagValue { impl TryFrom<&ConfigTagValue> for TagValue {
type Error = String; type Error = anyhow::Error;
fn try_from(tag_value: &ConfigTagValue) -> Result<Self, Self::Error> { fn try_from(tag_value: &ConfigTagValue) -> Result<Self, Self::Error> {
match tag_value.r#type { match tag_value.r#type {
ValueType::Text => { ValueType::Text => {
@@ -79,19 +79,19 @@ pub struct Mapping {
} }
impl TryFrom<&ConfigMapping> for Mapping { impl TryFrom<&ConfigMapping> for Mapping {
type Error = String; type Error = anyhow::Error;
fn try_from(mapping: &ConfigMapping) -> Result<Self, Self::Error> { fn try_from(mapping: &ConfigMapping) -> Result<Self, Self::Error> {
let topic = mapping let topic = mapping
.topic .topic
.split("/") .split("/")
.map(|level| TopicLevel::try_from(level)) .map(|level| TopicLevel::try_from(level))
.collect::<Result<Vec<TopicLevel>, String>>()?; .collect::<anyhow::Result<Vec<TopicLevel>>>()?;
let pre_multi_levels: Vec<&TopicLevel> = topic let pre_multi_levels: Vec<&TopicLevel> = topic
.iter() .iter()
.take_while(|level| **level != TopicLevel::MultiWildcard) .take_while(|level| **level != TopicLevel::MultiWildcard)
.collect(); .collect();
if pre_multi_levels.len() < topic.len() - 1 { if pre_multi_levels.len() < topic.len() - 1 {
Err(format!( Err(anyhow!(
"Topic '{}' has '#' wildcard before last topic level", "Topic '{}' has '#' wildcard before last topic level",
mapping.topic mapping.topic
))?; ))?;
@@ -103,7 +103,7 @@ impl TryFrom<&ConfigMapping> for Mapping {
.count(); .count();
let field_name = match InterpolatedName::try_from(mapping.field_name.as_str()) { let field_name = match InterpolatedName::try_from(mapping.field_name.as_str()) {
Ok(name) if find_max_ref(&name) > max_interp_ref => Err(format!( Ok(name) if find_max_ref(&name) > max_interp_ref => Err(anyhow!(
"Topic '{}' has field name '{}' which has invalid references", "Topic '{}' has field name '{}' which has invalid references",
mapping.topic, mapping.field_name mapping.topic, mapping.field_name
)), )),
@@ -115,10 +115,10 @@ impl TryFrom<&ConfigMapping> for Mapping {
None => Payload::Raw, None => Payload::Raw,
Some(ConfigPayload::Json { value_field_path, timestamp_field_path }) => { Some(ConfigPayload::Json { value_field_path, timestamp_field_path }) => {
let value_field_selector = Selector::new(&value_field_path) let value_field_selector = Selector::new(&value_field_path)
.map_err(|err| format!("Value field path '{}' is invalid: {}'", value_field_path, err))?; .map_err(|err| anyhow!("Value field path '{}' is invalid: {}'", value_field_path, err))?;
let timestamp_field_selector = timestamp_field_path.as_ref() let timestamp_field_selector = timestamp_field_path.as_ref()
.map(|path| Selector::new(path) .map(|path| Selector::new(path)
.map_err(|err| format!("Timestamp field path '{}' is invalid: {}'", path, err)) .map_err(|err| anyhow!("Timestamp field path '{}' is invalid: {}'", path, err))
) )
.transpose()?; .transpose()?;
Payload::Json { Payload::Json {
@@ -133,7 +133,7 @@ impl TryFrom<&ConfigMapping> for Mapping {
.iter() .iter()
.map(|tag| match TagValue::try_from(tag.1) { .map(|tag| match TagValue::try_from(tag.1) {
Ok(TagValue::InterpolatedStr(ref name)) if find_max_ref(name) > max_interp_ref => { Ok(TagValue::InterpolatedStr(ref name)) if find_max_ref(name) > max_interp_ref => {
Err(format!( Err(anyhow!(
"Topic '{}' has tag value '{:?}' which has invalid references", "Topic '{}' has tag value '{:?}' which has invalid references",
mapping.topic, tag.1 mapping.topic, tag.1
)) ))
@@ -141,7 +141,7 @@ impl TryFrom<&ConfigMapping> for Mapping {
Ok(value) => Ok((tag.0.clone(), value)), Ok(value) => Ok((tag.0.clone(), value)),
Err(err) => Err(err), Err(err) => Err(err),
}) })
.collect::<Result<Vec<(String, TagValue)>, String>>()?; .collect::<anyhow::Result<Vec<(String, TagValue)>>>()?;
Ok(Mapping { Ok(Mapping {
topic, topic,
@@ -167,7 +167,7 @@ mod test {
use super::*; use super::*;
#[test] #[test]
fn mapping_parsing() -> Result<(), String> { fn mapping_parsing() -> anyhow::Result<()> {
use TopicLevel::*; use TopicLevel::*;
fn mk_cfg_mapping(topic: &str) -> ConfigMapping { fn mk_cfg_mapping(topic: &str) -> ConfigMapping {

22
src/value.rs
View File

@@ -28,53 +28,53 @@ impl fmt::Display for ValueType {
} }
pub trait ToInfluxType { pub trait ToInfluxType {
fn to_influx_type(&self, value_type: ValueType) -> Result<Type, String>; fn to_influx_type(&self, value_type: ValueType) -> anyhow::Result<Type>;
} }
impl ToInfluxType for String { impl ToInfluxType for String {
fn to_influx_type(&self, value_type: ValueType) -> Result<Type, String> { fn to_influx_type(&self, value_type: ValueType) -> anyhow::Result<Type> {
match value_type { match value_type {
ValueType::Boolean if self == "true" => Ok(Type::Boolean(true)), ValueType::Boolean if self == "true" => Ok(Type::Boolean(true)),
ValueType::Boolean if self == "false" => Ok(Type::Boolean(false)), ValueType::Boolean if self == "false" => Ok(Type::Boolean(false)),
ValueType::Boolean => Err(format!("Value '{}' is not a valid boolean", self)), ValueType::Boolean => Err(anyhow!("Value '{}' is not a valid boolean", self)),
ValueType::Float => self ValueType::Float => self
.parse::<f64>() .parse::<f64>()
.map(|v| Type::Float(v)) .map(|v| Type::Float(v))
.map_err(|err| err.to_string()), .map_err(|err| err.into()),
ValueType::SignedInteger => self ValueType::SignedInteger => self
.parse::<i64>() .parse::<i64>()
.map(|v| Type::SignedInteger(v)) .map(|v| Type::SignedInteger(v))
.map_err(|err| err.to_string()), .map_err(|err| err.into()),
ValueType::UnsignedInteger => self ValueType::UnsignedInteger => self
.parse::<u64>() .parse::<u64>()
.map(|v| Type::UnsignedInteger(v)) .map(|v| Type::UnsignedInteger(v))
.map_err(|err| err.to_string()), .map_err(|err| err.into()),
ValueType::Text => Ok(Type::Text(self.clone())), ValueType::Text => Ok(Type::Text(self.clone())),
} }
} }
} }
impl ToInfluxType for JsonValue { impl ToInfluxType for JsonValue {
fn to_influx_type(&self, value_type: ValueType) -> Result<Type, String> { fn to_influx_type(&self, value_type: ValueType) -> anyhow::Result<Type> {
match (value_type, self) { match (value_type, self) {
(ValueType::Boolean, JsonValue::Bool(true)) => Ok(Type::Boolean(true)), (ValueType::Boolean, JsonValue::Bool(true)) => Ok(Type::Boolean(true)),
(ValueType::Boolean, JsonValue::Bool(false)) => Ok(Type::Boolean(false)), (ValueType::Boolean, JsonValue::Bool(false)) => Ok(Type::Boolean(false)),
(ValueType::Float, JsonValue::Number(num)) => num (ValueType::Float, JsonValue::Number(num)) => num
.as_f64() .as_f64()
.ok_or_else(|| format!("Cannot be expressed as f64: {}", num)) .ok_or_else(|| anyhow!("Cannot be expressed as f64: {}", num))
.map(|v| Type::Float(v)), .map(|v| Type::Float(v)),
(ValueType::SignedInteger, JsonValue::Number(num)) => num (ValueType::SignedInteger, JsonValue::Number(num)) => num
.as_i64() .as_i64()
.ok_or_else(|| format!("Cannot be expressed as i64:{}", num)) .ok_or_else(|| anyhow!("Cannot be expressed as i64: {}", num))
.map(|v| Type::SignedInteger(v)), .map(|v| Type::SignedInteger(v)),
(ValueType::UnsignedInteger, JsonValue::Number(num)) => num (ValueType::UnsignedInteger, JsonValue::Number(num)) => num
.as_u64() .as_u64()
.ok_or_else(|| format!("Cannot be expressed as u64:{}", num)) .ok_or_else(|| anyhow!("Cannot be expressed as u64: {}", num))
.map(|v| Type::UnsignedInteger(v)), .map(|v| Type::UnsignedInteger(v)),
(ValueType::Text, JsonValue::String(s)) => Ok(Type::Text(s.to_string())), (ValueType::Text, JsonValue::String(s)) => Ok(Type::Text(s.to_string())),
(ValueType::Text, JsonValue::Bool(b)) => Ok(Type::Text(b.to_string())), (ValueType::Text, JsonValue::Bool(b)) => Ok(Type::Text(b.to_string())),
(ValueType::Text, JsonValue::Number(num)) => Ok(Type::Text(num.to_string())), (ValueType::Text, JsonValue::Number(num)) => Ok(Type::Text(num.to_string())),
(other_type, other_value) => Err(format!("Unable to parse self from JSON; need type {} but got '{}'", other_type, other_value)), (other_type, other_value) => Err(anyhow!("Unable to parse self from JSON; need type {} but got '{}'", other_type, other_value)),
} }
} }
} }