76 lines
2.3 KiB
Rust
76 lines
2.3 KiB
Rust
use std::collections::HashMap;
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use serde::ser::{Serialize, SerializeMap, Serializer};
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use serde_json::{Map, Value};
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use super::interface::SessionState;
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const SESSION_STATE_FORMAT_VERSION: u8 = 1;
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#[derive(Debug)]
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struct StoredSessionStateRef<'a> {
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state: &'a SessionState,
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}
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impl Serialize for StoredSessionStateRef<'_> {
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fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
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where
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S: Serializer,
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{
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let mut map = serializer.serialize_map(Some(2))?;
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map.serialize_entry("v", &SESSION_STATE_FORMAT_VERSION)?;
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map.serialize_entry("state", self.state)?;
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map.end()
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}
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}
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pub(crate) fn serialize_session_state(
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session_state: &SessionState,
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) -> Result<String, anyhow::Error> {
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let stored = StoredSessionStateRef {
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state: session_state,
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};
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serde_json::to_string(&stored).map_err(anyhow::Error::new)
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}
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pub(crate) fn deserialize_session_state(value: &str) -> Result<SessionState, anyhow::Error> {
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let value = serde_json::from_str::<Value>(value)?;
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let Value::Object(mut obj) = value else {
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anyhow::bail!("Session state is not a JSON object");
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};
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if matches!(obj.get("state"), Some(Value::Object(_))) {
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if let Some(Value::Number(v)) = obj.get("v") {
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let v = v
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.as_u64()
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.ok_or_else(|| anyhow::anyhow!("Invalid session state format version"))?;
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let v = u8::try_from(v)
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.map_err(|_| anyhow::anyhow!("Invalid session state format version"))?;
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anyhow::ensure!(
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v == SESSION_STATE_FORMAT_VERSION,
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"Unsupported session state format version: {}",
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v
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);
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let Some(Value::Object(state)) = obj.remove("state") else {
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unreachable!("`state` was checked to be an object above");
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};
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return Ok(state);
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}
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}
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if obj.values().all(Value::is_string) {
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let legacy: HashMap<String, String> = serde_json::from_value(Value::Object(obj))?;
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let mut migrated: Map<String, Value> = Map::new();
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for (key, json_encoded) in legacy {
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migrated.insert(key, serde_json::from_str::<Value>(&json_encoded)?);
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}
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return Ok(migrated);
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}
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Ok(obj)
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}
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