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use crate::error::CallError;
use alloc::collections::BTreeMap;
use serde::de::{self, Deserializer, Unexpected, Visitor};
use serde::ser::Serializer;
use serde::{Deserialize, Serialize};
use serde_json::Value as JsonValue;
use std::fmt;
/// JSON-RPC parameter values for subscriptions.
#[derive(Serialize, Deserialize, Debug)]
pub struct JsonRpcSubscriptionParams<T> {
/// Subscription ID
pub subscription: SubscriptionId,
/// Result.
pub result: T,
}
/// JSON-RPC v2 marker type.
#[derive(Clone, Copy, Debug, Default, PartialEq)]
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pub struct TwoPointZero;
struct TwoPointZeroVisitor;
impl<'de> Visitor<'de> for TwoPointZeroVisitor {
type Value = TwoPointZero;
fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result {
formatter.write_str(r#"a string "2.0""#)
}
fn visit_str<E>(self, s: &str) -> Result<Self::Value, E>
where
E: de::Error,
{
match s {
"2.0" => Ok(TwoPointZero),
_ => Err(de::Error::invalid_value(Unexpected::Str(s), &self)),
}
}
}
impl<'de> Deserialize<'de> for TwoPointZero {
fn deserialize<D>(deserializer: D) -> Result<TwoPointZero, D::Error>
where
D: Deserializer<'de>,
{
deserializer.deserialize_str(TwoPointZeroVisitor)
}
}
impl Serialize for TwoPointZero {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: Serializer,
{
serializer.serialize_str("2.0")
}
}
/// Parameters sent with the RPC request
#[derive(Clone, Copy, Debug)]
pub struct RpcParams<'a>(Option<&'a str>);
impl<'a> RpcParams<'a> {
/// Create params
pub fn new(raw: Option<&'a str>) -> Self {
Self(raw)
}
/// Attempt to parse all parameters as array or map into type T
pub fn parse<T>(self) -> Result<T, CallError>
where
T: Deserialize<'a>,
{
let params = self.0.unwrap_or("null");
serde_json::from_str(params).map_err(|_| CallError::InvalidParams)
}
/// Attempt to parse only the first parameter from an array into type T
pub fn one<T>(self) -> Result<T, CallError>
where
T: Deserialize<'a>,
{
self.parse::<[T; 1]>().map(|[res]| res)
}
}
/// Owned version of [`RpcParams`].
#[derive(Clone, Debug)]
pub struct OwnedRpcParams(Option<String>);
impl OwnedRpcParams {
/// Converts `OwnedRpcParams` into borrowed [`RpcParams`].
pub fn borrowed(&self) -> RpcParams<'_> {
RpcParams(self.0.as_ref().map(|s| s.as_ref()))
}
}
impl<'a> From<RpcParams<'a>> for OwnedRpcParams {
fn from(borrowed: RpcParams<'a>) -> Self {
Self(borrowed.0.map(Into::into))
}
}
/// [Serializable JSON-RPC parameters](https://www.jsonrpc.org/specification#parameter_structures)
///
/// If your type implement `Into<JsonValue>` call that favor of `serde_json::to:value` to
/// construct the parameters. Because `serde_json::to_value` serializes the type which
/// allocates whereas `Into<JsonValue>` doesn't in most cases.
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#[serde(untagged)]
pub enum JsonRpcParams<'a> {
/// No params.
NoParams,
/// Positional params (heap allocated)
Array(Vec<JsonValue>),
/// Positional params (slice)
ArrayRef(&'a [JsonValue]),
/// Params by name.
Map(BTreeMap<&'a str, JsonValue>),
}
impl<'a> From<BTreeMap<&'a str, JsonValue>> for JsonRpcParams<'a> {
fn from(map: BTreeMap<&'a str, JsonValue>) -> Self {
Self::Map(map)
}
}
impl<'a> From<Vec<JsonValue>> for JsonRpcParams<'a> {
fn from(arr: Vec<JsonValue>) -> Self {
Self::Array(arr)
}
}
impl<'a> From<&'a [JsonValue]> for JsonRpcParams<'a> {
fn from(slice: &'a [JsonValue]) -> Self {
Self::ArrayRef(slice)
}
}
/// Id of a subscription, communicated by the server.
#[derive(Debug, PartialEq, Clone, Hash, Eq, Deserialize, Serialize)]
#[serde(deny_unknown_fields)]
#[serde(untagged)]
pub enum SubscriptionId {
/// Numeric id
Num(u64),
/// String id
Str(String),
}
impl From<SubscriptionId> for JsonValue {
fn from(sub_id: SubscriptionId) -> Self {
match sub_id {
SubscriptionId::Num(n) => n.into(),
SubscriptionId::Str(s) => s.into(),
}
}
}
/// Request Id
#[derive(Debug, PartialEq, Clone, Hash, Eq, Deserialize, Serialize)]
#[serde(deny_unknown_fields)]
#[serde(untagged)]
pub enum Id<'a> {
/// Null
Null,
/// Numeric id
Number(u64),
/// String id
#[serde(borrow)]
Str(Cow<'a, str>),
impl<'a> Id<'a> {
/// If the Id is a number, returns the associated number. Returns None otherwise.
pub fn as_number(&self) -> Option<&u64> {
match self {
_ => None,
}
}
/// If the Id is a String, returns the associated str. Returns None otherwise.
pub fn as_str(&self) -> Option<&str> {
match self {
Self::Str(s) => Some(s.as_ref()),
_ => None,
}
}
/// If the ID is Null, returns (). Returns None otherwise.
pub fn as_null(&self) -> Option<()> {
match self {
_ => None,
}
}
}
/// Owned version of [`Id`] that allocates memory for the `Str` variant.
#[derive(Debug, PartialEq, Clone, Hash, Eq, Deserialize, Serialize)]
#[serde(deny_unknown_fields)]
#[serde(untagged)]
pub enum OwnedId {
/// Null
Null,
/// Numeric id
Number(u64),
/// String id
Str(String),
}
impl OwnedId {
/// Converts `OwnedId` into borrowed `Id`.
pub fn borrowed(&self) -> Id<'_> {
match self {
Self::Null => Id::Null,
Self::Number(num) => Id::Number(*num),
Self::Str(str) => Id::Str(Cow::borrowed(str)),
}
}
}
impl<'a> From<Id<'a>> for OwnedId {
fn from(borrowed: Id<'a>) -> Self {
match borrowed {
Id::Null => Self::Null,
Id::Number(num) => Self::Number(num),
Id::Str(num) => Self::Str(num.as_ref().to_owned()),
}
}
}
#[cfg(test)]
mod test {
use super::{
Cow, Id, JsonRpcParams, JsonRpcSubscriptionParams, JsonValue, RpcParams, SubscriptionId, TwoPointZero,
};
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#[test]
fn id_deserialization() {
let s = r#""2""#;
let deserialized: Id = serde_json::from_str(s).unwrap();
assert_eq!(deserialized, Id::Str("2".into()));
let s = r#"2"#;
let deserialized: Id = serde_json::from_str(s).unwrap();
assert_eq!(deserialized, Id::Number(2));
let s = r#""2x""#;
let deserialized: Id = serde_json::from_str(s).unwrap();
assert_eq!(deserialized, Id::Str(Cow::const_str("2x")));
let s = r#"[1337]"#;
assert!(serde_json::from_str::<Id>(s).is_err());
let s = r#"[null, 0, 2, "3"]"#;
let deserialized: Vec<Id> = serde_json::from_str(s).unwrap();
assert_eq!(deserialized, vec![Id::Null, Id::Number(0), Id::Number(2), Id::Str("3".into())]);
}
#[test]
fn id_serialization() {
let d =
vec![Id::Null, Id::Number(0), Id::Number(2), Id::Number(3), Id::Str("3".into()), Id::Str("test".into())];
let serialized = serde_json::to_string(&d).unwrap();
assert_eq!(serialized, r#"[null,0,2,3,"3","test"]"#);
}
#[test]
fn params_serialize() {
let test_vector = &[
("null", JsonRpcParams::NoParams),
("[42,23]", JsonRpcParams::Array(serde_json::from_str("[42,23]").unwrap())),
(
r#"{"a":42,"b":null,"c":"aa"}"#,
JsonRpcParams::Map(serde_json::from_str(r#"{"a":42,"b":null,"c":"aa"}"#).unwrap()),
),
];
for (initial_ser, params) in test_vector {
let serialized = serde_json::to_string(params).unwrap();
assert_eq!(&serialized, initial_ser);
}
}
#[test]
fn params_parse() {
let none = RpcParams::new(None);
assert!(none.one::<u64>().is_err());
let array_params = RpcParams::new(Some("[1, 2, 3]"));
let arr: Result<[u64; 3], _> = array_params.parse();
assert!(arr.is_ok());
let arr: Result<(u64, u64, u64), _> = array_params.parse();
assert!(arr.is_ok());
let array_one = RpcParams::new(Some("[1]"));
let one: Result<u64, _> = array_one.one();
assert!(one.is_ok());
let object_params = RpcParams::new(Some(r#"{"beef":99,"dinner":0}"#));
let obj: Result<JsonValue, _> = object_params.parse();
assert!(obj.is_ok());
}
#[test]
fn two_point_zero_serde_works() {
let initial_ser = r#""2.0""#;
// The fact that it was deserialized is enough.
let two_point_zero: TwoPointZero = serde_json::from_str(initial_ser).unwrap();
let serialized = serde_json::to_string(&two_point_zero).unwrap();
assert_eq!(serialized, initial_ser);
}
#[test]
fn subscription_id_serde_works() {
let test_vector = &[("42", SubscriptionId::Num(42)), (r#""one""#, SubscriptionId::Str("one".into()))];
for (initial_ser, expected) in test_vector {
let id: SubscriptionId = serde_json::from_str(initial_ser).unwrap();
assert_eq!(&id, expected);
let serialized = serde_json::to_string(&id).unwrap();
assert_eq!(&serialized, initial_ser);
}
}
#[test]
fn subscription_params_serialize_work() {
let ser =
serde_json::to_string(&JsonRpcSubscriptionParams { subscription: SubscriptionId::Num(12), result: "goal" })
.unwrap();
let exp = r#"{"subscription":12,"result":"goal"}"#;
assert_eq!(ser, exp);
}
#[test]
fn subscription_params_deserialize_work() {
let ser = r#"{"subscription":"9","result":"offside"}"#;
assert!(
serde_json::from_str::<JsonRpcSubscriptionParams<()>>(ser).is_err(),
"invalid type should not be deserializable"
);
let dsr: JsonRpcSubscriptionParams<JsonValue> = serde_json::from_str(ser).unwrap();
assert_eq!(dsr.subscription, SubscriptionId::Str("9".into()));
assert_eq!(dsr.result, serde_json::json!("offside"));
}