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use_prelude!();
use crate::error::{DittoError, ErrorKind};
#[derive(Debug, Clone, Default, PartialOrd, Ord, PartialEq, Eq, Hash)]
/// An identifier for a [`DittoDocument`].
///
/// Each `DocumentId` represents a unique identifier for a document.
pub struct DocumentId {
pub(crate) bytes: Vec<u8>,
}
impl DocumentId {
/// Create a new DocumentId from a serializable value.
/// # panic
/// This function will panic if the value can't be serialized into cbor.
pub fn new<V: ::serde::Serialize>(value: &V) -> Result<Self, DittoError> {
let cbor_bytes = ::serde_cbor::to_vec(value).unwrap();
let bytes = validate_doc_id_cbor_bytes(cbor_bytes)?;
Ok(Self { bytes })
}
/// Return a String representation of the DocumentId that can be used in a query string.
pub fn to_query_compatible(
&self,
string_primitive_fmt: ffi_sdk::StringPrimitiveFormat,
) -> String {
let str_boxed = ffi_sdk::ditto_document_id_query_compatible(
self.bytes.as_slice().into(),
string_primitive_fmt,
);
str_boxed.into_string()
}
/// Return the inner bytes value in a cbor form
pub fn value(&self) -> ::serde_cbor::Value {
self.to_cbor()
}
/// Return the inner bytes value in a cbor form
pub fn to_cbor(&self) -> ::serde_cbor::Value {
::serde_cbor::from_slice(&self.bytes[..]).expect("DocumentId can be represented as CBOR")
}
}
impl From<Vec<u8>> for DocumentId {
fn from(bytes: Vec<u8>) -> Self {
Self { bytes }
}
}
impl From<Box<[u8]>> for DocumentId {
fn from(bytes: Box<[u8]>) -> Self {
Self {
bytes: bytes.into(),
}
}
}
impl From<&[u8]> for DocumentId {
fn from(slice: &[u8]) -> Self {
Self {
bytes: slice.to_owned().to_vec(),
}
}
}
impl AsRef<[u8]> for DocumentId {
fn as_ref(&self) -> &[u8] {
&self.bytes[..]
}
}
impl std::fmt::Display for DocumentId {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(
f,
"{}",
self.to_query_compatible(ffi_sdk::StringPrimitiveFormat::WithoutQuotes)
)
}
}
impl serde::Serialize for DocumentId {
fn serialize<S: serde::Serializer>(&self, serializer: S) -> Result<S::Ok, S::Error> {
// Note (Ham & Daniel): This serialization was previously done by first
// deserializing the document ID's CBOR bytes into a `serde_cbor::Value`
// before then serializing that into the serialized form. This was
// usually fine because the serializer being used to serialize the
// `serde_cbor::Value` was almost always `serde_cbor`'s, and so while a
// little bit of a roundabout method of getting back to some CBOR bytes,
// it always worked fine.
//
// However, if you wanted to `upsert` a document into Ditto by
// specifying the document's content using `serde_json`'s `json!` macro
// and you wanted to specify the document's ID by providing a
// `DocumentId` value under the `_id` at the root of the document then
// this codepath would get hit and would lead to an error if you were
// using a document ID that contained an integer value. This is because
// `serde_cbor::Value` has an `Integer` case that stores all integers as
// `i128`s. `serde_json` does not support serializing `i128`s and would
// return an error saying as much. It looks like you'd then be able to
// get this to work by enabling the `"arbitrary_precision"` feature of
// `serde_json`. This does mean that you don't get an error returned
// anymore but integers then end up getting serialized as an object
// like:
//
// { "$serde_json::private::Number": 42 }
//
// This does not work well with in a cross-platform world unfortunately.
//
// As such, we're instead using `serde_transcode` for now, to avoid all
// integers getting temporarily represented as `i128`s. This may or may
// not end up being a suitable long term solution so is something that
// may need to be re-evaluated in the future.
let mut deserializer = serde_cbor::Deserializer::from_slice(&self.bytes[..]);
serde_transcode::transcode(&mut deserializer, serializer)
}
}
impl<'de> serde::de::Deserialize<'de> for DocumentId {
fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
where
D: serde::de::Deserializer<'de>,
{
let cbor_bytes =
serde_cbor::to_vec(&serde_cbor::Value::deserialize(deserializer)?).unwrap();
// We have to go to the trouble of crossing the FFI to ensure that the
// bytes we've got here are in Ditto document ID canonical CBOR form
let bytes = validate_doc_id_cbor_bytes(cbor_bytes)
.expect("document id bytes are valid when deserializing");
Ok(Self { bytes })
}
}
fn validate_doc_id_cbor_bytes(bytes: Vec<u8>) -> Result<Vec<u8>, DittoError> {
use safer_ffi::prelude::{AsOut, ManuallyDropMut};
let mut out_cbor_slot = None;
let out_cbor = out_cbor_slot.manually_drop_mut().as_out();
{
let res = ffi_sdk::ditto_validate_document_id(bytes[..].into(), out_cbor);
if res != 0 {
return Err(DittoError::from_ffi(ErrorKind::Internal));
}
}
Ok(match out_cbor_slot {
None => bytes,
Some(cbor_boxed_slice) => cbor_boxed_slice.to::<Box<[u8]>>().into(),
})
}