// A generic keyvalue interface for WASI.
interface types {
/// A bucket is a collection of key-value pairs. Each key-value pair is stored
/// as a entry in the bucket, and the bucket itself acts as a collection of all
/// these entries.
///
/// It is worth noting that the exact terminology for bucket in key-value stores
/// can very depending on the specific implementation. For example,
/// 1. Amazon DynamoDB calls a collection of key-value pairs a table
/// 2. Redis has hashes, sets, and sorted sets as different types of collections
/// 3. Cassandra calls a collection of key-value pairs a column family
/// 4. MongoDB calls a collection of key-value pairs a collection
/// 5. Riak calls a collection of key-value pairs a bucket
/// 6. Memcached calls a collection of key-value pairs a slab
/// 7. Azure Cosmos DB calls a collection of key-value pairs a container
///
/// In this interface, we use the term `bucket` to refer to a collection of key-value
// Soon: switch to `resource bucket { ... }`
type bucket = u32;
drop-bucket: func(bucket: bucket);
open-bucket: func(name: string) -> result<bucket, error>;
/// A key is a unique identifier for a value in a bucket. The key is used to
/// retrieve the value from the bucket.
type key = string;
/// A list of keys
type keys = list<key>;
use wasi:io/streams@0.2.0-rc-2023-11-10.{input-stream, output-stream};
use wasi-cloud-error.{ error };
/// A value is the data stored in a key-value pair. The value can be of any type
/// that can be represented in a byte array. It provides a way to write the value
/// to the output-stream defined in the `wasi-io` interface.
// Soon: switch to `resource value { ... }`
type outgoing-value = u32;
type outgoing-value-body-async = output-stream;
type outgoing-value-body-sync = list<u8>;
drop-outgoing-value: func(outgoing-value: outgoing-value);
new-outgoing-value: func() -> outgoing-value;
outgoing-value-write-body-async: func(outgoing-value: outgoing-value) -> result<outgoing-value-body-async, error>;
outgoing-value-write-body-sync: func(outgoing-value: outgoing-value, value: outgoing-value-body-sync) -> result<_, error>;
/// A incoming-value is a wrapper around a value. It provides a way to read the value
/// from the input-stream defined in the `wasi-io` interface.
///
/// The incoming-value provides two ways to consume the value:
/// 1. `incoming-value-consume-sync` consumes the value synchronously and returns the
/// value as a list of bytes.
/// 2. `incoming-value-consume-async` consumes the value asynchronously and returns the
/// value as an input-stream.
// Soon: switch to `resource incoming-value { ... }`
type incoming-value = u32;
type incoming-value-async-body = input-stream;
type incoming-value-sync-body = list<u8>;
drop-incoming-value: func(incoming-value: incoming-value);
incoming-value-consume-sync: func(incoming-value: incoming-value) -> result<incoming-value-sync-body, error>;
incoming-value-consume-async: func(incoming-value: incoming-value) -> result<incoming-value-async-body, error>;
size: func(incoming-value: incoming-value) -> u64;
}