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First implementation of ReadItem

This commit is contained in:
Alex 2022-04-14 16:19:31 +02:00
parent 025db41bba
commit 84536f2e75
Signed by: lx
GPG Key ID: 0E496D15096376BE
5 changed files with 157 additions and 30 deletions
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5
src/api/error.rs
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@ -100,6 +100,10 @@ pub enum Error {
#[error(display = "Bad request: {}", _0)]
BadRequest(String),
/// The client asked for an invalid return format (invalid Accept header)
#[error(display = "Not acceptable: {}", _0)]
NotAcceptable(String),
/// The client sent a request for an action not supported by garage
#[error(display = "Unimplemented action: {}", _0)]
NotImplemented(String),
@ -140,6 +144,7 @@ impl Error {
Error::BucketNotEmpty | Error::BucketAlreadyExists => StatusCode::CONFLICT,
Error::PreconditionFailed => StatusCode::PRECONDITION_FAILED,
Error::Forbidden(_) => StatusCode::FORBIDDEN,
Error::NotAcceptable(_) => StatusCode::NOT_ACCEPTABLE,
Error::InternalError(
GarageError::Timeout
| GarageError::RemoteError(_)

5
src/api/k2v/api_server.rs
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@ -19,6 +19,7 @@ use crate::signature::payload::check_payload_signature;
use crate::signature::streaming::*;
use crate::helpers::*;
use crate::k2v::item::*;
use crate::k2v::router::Endpoint;
use crate::s3::cors::*;
@ -122,6 +123,10 @@ impl ApiHandler for K2VApiServer {
};
let resp = match endpoint {
Endpoint::ReadItem {
partition_key,
sort_key,
} => handle_read_item(garage, &req, bucket_id, &partition_key, &sort_key).await,
//TODO
endpoint => Err(Error::NotImplemented(endpoint.name().to_owned())),
};

123
src/api/k2v/item.rs Normal file
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@ -0,0 +1,123 @@
//! Function related to GET and HEAD requests
use std::sync::Arc;
use std::time::{Duration, UNIX_EPOCH};
use futures::stream::*;
use http::header;
use hyper::body::Bytes;
use hyper::{Body, Request, Response, StatusCode};
use garage_table::EmptyKey;
use garage_util::data::*;
use garage_model::garage::Garage;
use garage_model::k2v::item_table::*;
use crate::error::*;
const X_GARAGE_CAUSALITY_TOKEN: &'static str = "X-Garage-Causality-Token";
pub enum ReturnFormat {
Json,
Binary,
Either,
}
impl ReturnFormat {
pub fn from(req: &Request<Body>) -> Result<Self, Error> {
let accept = match req.headers().get(header::ACCEPT) {
Some(a) => a.to_str()?,
None => return Ok(Self::Json),
};
let accept = accept.split(',').map(|s| s.trim()).collect::<Vec<_>>();
let accept_json = accept.contains(&"application/json");
let accept_binary = accept.contains(&"application/octet-stream");
match (accept_json, accept_binary) {
(true, true) => Ok(Self::Either),
(true, false) => Ok(Self::Json),
(false, true) => Ok(Self::Binary),
(false, false) => Err(Error::NotAcceptable("Invalid Accept: header value, must contain either application/json or application/octet-stream (or both)".into())),
}
}
pub fn make_response(&self, item: &K2VItem) -> Result<Response<Body>, Error> {
let vals = item.values();
if vals.len() == 0 {
return Err(Error::NoSuchKey);
}
let ct = item.causality_context().serialize();
match self {
Self::Binary if vals.len() > 1 => Ok(Response::builder()
.header(X_GARAGE_CAUSALITY_TOKEN, ct)
.status(StatusCode::CONFLICT)
.body(Body::empty())?),
Self::Binary => {
assert!(vals.len() == 1);
Self::make_binary_response(ct, vals[0])
}
Self::Either if vals.len() == 1 => Self::make_binary_response(ct, vals[0]),
_ => Self::make_json_response(ct, &vals[..]),
}
}
fn make_binary_response(ct: String, v: &DvvsValue) -> Result<Response<Body>, Error> {
match v {
DvvsValue::Deleted => Ok(Response::builder()
.header(X_GARAGE_CAUSALITY_TOKEN, ct)
.header(header::CONTENT_TYPE, "application/octet-stream")
.status(StatusCode::NO_CONTENT)
.body(Body::empty())?),
DvvsValue::Value(v) => Ok(Response::builder()
.header(X_GARAGE_CAUSALITY_TOKEN, ct)
.header(header::CONTENT_TYPE, "application/octet-stream")
.status(StatusCode::OK)
.body(Body::from(v.to_vec()))?),
}
}
fn make_json_response(ct: String, v: &[&DvvsValue]) -> Result<Response<Body>, Error> {
let items = v
.iter()
.map(|v| match v {
DvvsValue::Deleted => serde_json::Value::Null,
DvvsValue::Value(v) => serde_json::Value::String(base64::encode(v)),
})
.collect::<Vec<_>>();
let json_body =
serde_json::to_string_pretty(&items).ok_or_internal_error("JSON encoding error")?;
Ok(Response::builder()
.header(X_GARAGE_CAUSALITY_TOKEN, ct)
.header(header::CONTENT_TYPE, "application/json")
.status(StatusCode::OK)
.body(Body::from(json_body))?)
}
}
/// Handle ReadItem request
pub async fn handle_read_item(
garage: Arc<Garage>,
req: &Request<Body>,
bucket_id: Uuid,
partition_key: &str,
sort_key: &String,
) -> Result<Response<Body>, Error> {
let format = ReturnFormat::from(req)?;
let item = garage
.k2v_item_table
.get(
&K2VItemPartition {
bucket_id,
partition_key: partition_key.to_string(),
},
sort_key,
)
.await?
.ok_or(Error::NoSuchKey)?;
format.make_response(&item)
}

2
src/api/k2v/mod.rs
View File

@ -1,3 +1,5 @@
pub mod api_server;
mod router;
mod item;

52
src/model/k2v/item_table.rs
View File

@ -36,44 +36,36 @@ pub enum DvvsValue {
impl K2VItem {
/// Creates a new K2VItem when no previous entry existed in the db
pub fn new(
bucket_id: Uuid,
partition_key: String,
sort_key: String,
this_node: Uuid,
value: DvvsValue,
) -> Self {
let mut ret = Self {
pub fn new(bucket_id: Uuid, partition_key: String, sort_key: String) -> Self {
Self {
partition: K2VItemPartition {
bucket_id,
partition_key,
},
sort_key,
items: BTreeMap::new(),
};
let node_id = make_node_id(this_node);
ret.items.insert(
node_id,
DvvsEntry {
t_discard: 0,
values: vec![(1, value)],
},
);
ret
}
}
/// Updates a K2VItem with a new value or a deletion event
pub fn update(&mut self, this_node: Uuid, context: CausalContext, new_value: DvvsValue) {
for (node, t_discard) in context.vector_clock.iter() {
if let Some(e) = self.items.get_mut(node) {
e.t_discard = std::cmp::max(e.t_discard, *t_discard);
} else {
self.items.insert(
*node,
DvvsEntry {
t_discard: *t_discard,
values: vec![],
},
);
pub fn update(
&mut self,
this_node: Uuid,
context: Option<CausalContext>,
new_value: DvvsValue,
) {
if let Some(context) = context {
for (node, t_discard) in context.vector_clock.iter() {
if let Some(e) = self.items.get_mut(node) {
e.t_discard = std::cmp::max(e.t_discard, *t_discard);
} else {
self.items.insert(
*node,
DvvsEntry {
t_discard: *t_discard,
values: vec![],
},
);
}
}
}