Offchain-worker APIs stubs (#2615)

* WiP: HTTP Apis. * Working on the API. * Add docs, clean up the API. * Expose ext_ stuff as well. * Implement HTTP helpers for offchain sr-io. * Remove HTTP stuff. * Revert "Remove HTTP stuff." This reverts commit 7cca029d6ae93c5849b50edfcc6d2c313ba3e5bf. * HTTP apis. * Additional offchain methods. * Make it compile. * Implement wasm-ext boundary of offchain methods. * Add stubs for offchain stuff to prevent panics. * Fix tests. * Addres some more issues. * Introduce typedef, use unsafe from_utf8 * Bump runtime version. * Introduce error to distinguish deadline and io errors. * Add local_storage_cas * Some tests for offchain stuff. * Address more grumbles. * Fix tests compilation. * Fix borked merge. * Improve docs for expected return values from ext functions. * Adding new sign/enrypt/decrypt APIs.
2026-06-12 21:41:12 +00:00 · 2019-05-31 09:33:44 +02:00
parent 80b18c8531
commit 308ab4f269
26 changed files with 2648 additions and 120 deletions
@@ -0,0 +1,244 @@
+// Copyright 2019 Parity Technologies (UK) Ltd.
+// This file is part of Substrate.
+
+// Substrate is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+
+// Substrate is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with Substrate.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Offchain Externalities implementation for tests.
+
+use std::{
+	collections::BTreeMap,
+	sync::Arc,
+};
+use parking_lot::RwLock;
+use primitives::offchain::{
+	self,
+	HttpError,
+	HttpRequestId as RequestId,
+	HttpRequestStatus as RequestStatus,
+	Timestamp,
+	CryptoKind,
+	CryptoKeyId,
+};
+
+/// Pending request.
+#[derive(Debug, Default, PartialEq, Eq)]
+pub struct PendingRequest {
+	/// HTTP method
+	pub method: String,
+	/// URI
+	pub uri: String,
+	/// Encoded Metadata
+	pub meta: Vec<u8>,
+	/// Request headers
+	pub headers: Vec<(String, String)>,
+	/// Request body
+	pub body: Vec<u8>,
+	/// Has the request been sent already.
+	pub sent: bool,
+	/// Response body
+	pub response: Vec<u8>,
+	/// Number of bytes already read from the response body.
+	pub read: usize,
+	/// Response headers
+	pub response_headers: Vec<(String, String)>,
+}
+
+/// Internal state of the externalities.
+///
+/// This can be used in tests to respond or assert stuff about interactions.
+#[derive(Debug, Default)]
+pub struct State {
+	/// A list of pending requests.
+	pub requests: BTreeMap<RequestId, PendingRequest>,
+}
+
+impl State {
+	/// Asserts that pending request has been submitted and fills it's response.
+	pub fn fulfill_pending_request(
+		&mut self,
+		id: u16,
+		expected: PendingRequest,
+		response: impl Into<Vec<u8>>,
+		response_headers: impl IntoIterator<Item=(String, String)>,
+	) {
+		match self.requests.get_mut(&RequestId(id)) {
+			None => {
+				panic!("Missing expected request: {:?}.\n\nAll: {:?}", id, self.requests);
+			}
+			Some(req) => {
+				assert_eq!(
+					*req,
+					expected,
+				);
+				req.response = response.into();
+				req.response_headers = response_headers.into_iter().collect();
+			}
+		}
+	}
+}
+
+/// Implementation of offchain externalities used for tests.
+#[derive(Clone, Default, Debug)]
+pub struct TestOffchainExt(pub Arc<RwLock<State>>);
+
+impl offchain::Externalities for TestOffchainExt {
+	fn submit_transaction(&mut self, _ex: Vec<u8>) -> Result<(), ()> {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn new_crypto_key(&mut self, _crypto: CryptoKind) -> Result<CryptoKeyId, ()> {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn encrypt(&mut self, _key: Option<CryptoKeyId>, _data: &[u8]) -> Result<Vec<u8>, ()> {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn decrypt(&mut self, _key: Option<CryptoKeyId>, _data: &[u8]) -> Result<Vec<u8>, ()> {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn sign(&mut self, _key: Option<CryptoKeyId>, _data: &[u8]) -> Result<Vec<u8>, ()> {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn verify(&mut self, _key: Option<CryptoKeyId>, _msg: &[u8], _signature: &[u8]) -> Result<bool, ()> {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn timestamp(&mut self) -> Timestamp {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn sleep_until(&mut self, _deadline: Timestamp) {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn random_seed(&mut self) -> [u8; 32] {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn local_storage_set(&mut self, _key: &[u8], _value: &[u8]) {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn local_storage_compare_and_set(
+		&mut self,
+		_key: &[u8],
+		_old_value: &[u8],
+		_new_value: &[u8]
+	) {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn local_storage_get(&mut self, _key: &[u8]) -> Option<Vec<u8>> {
+		unimplemented!("not needed in tests so far")
+	}
+
+	fn http_request_start(&mut self, method: &str, uri: &str, meta: &[u8]) -> Result<RequestId, ()> {
+		let mut state = self.0.write();
+		let id = RequestId(state.requests.len() as u16);
+		state.requests.insert(id.clone(), PendingRequest {
+			method: method.into(),
+			uri: uri.into(),
+			meta: meta.into(),
+			..Default::default()
+		});
+		Ok(id)
+	}
+
+	fn http_request_add_header(
+		&mut self,
+		request_id: RequestId,
+		name: &str,
+		value: &str,
+	) -> Result<(), ()> {
+		let mut state = self.0.write();
+		if let Some(req) = state.requests.get_mut(&request_id) {
+			req.headers.push((name.into(), value.into()));
+			Ok(())
+		} else {
+			Err(())
+		}
+	}
+
+	fn http_request_write_body(
+		&mut self,
+		request_id: RequestId,
+		chunk: &[u8],
+		_deadline: Option<Timestamp>
+	) -> Result<(), HttpError> {
+		let mut state = self.0.write();
+		if let Some(req) = state.requests.get_mut(&request_id) {
+			if chunk.is_empty() {
+				req.sent = true;
+			}
+			req.body.extend(chunk);
+			Ok(())
+		} else {
+			Err(HttpError::IoError)
+		}
+	}
+
+	fn http_response_wait(
+		&mut self,
+		ids: &[RequestId],
+		_deadline: Option<Timestamp>,
+	) -> Vec<RequestStatus> {
+		let state = self.0.read();
+
+		ids.iter().map(|id| match state.requests.get(id) {
+			Some(req) if req.response.is_empty() => RequestStatus::DeadlineReached,
+			None => RequestStatus::Unknown,
+			_ => RequestStatus::Finished(200),
+		}).collect()
+	}
+
+	fn http_response_headers(&mut self, request_id: RequestId) -> Vec<(Vec<u8>, Vec<u8>)> {
+		let state = self.0.read();
+		if let Some(req) = state.requests.get(&request_id) {
+			req.response_headers
+				.clone()
+				.into_iter()
+				.map(|(k, v)| (k.into_bytes(), v.into_bytes()))
+				.collect()
+		} else {
+			Default::default()
+		}
+	}
+
+	fn http_response_read_body(
+		&mut self,
+		request_id: RequestId,
+		buffer: &mut [u8],
+		_deadline: Option<Timestamp>
+	) -> Result<usize, HttpError> {
+		let mut state = self.0.write();
+		if let Some(req) = state.requests.get_mut(&request_id) {
+			if req.read >= req.response.len() {
+				// Remove the pending request as per spec.
+				state.requests.remove(&request_id);
+				Ok(0)
+			} else {
+				let read = std::cmp::min(buffer.len(), req.response[req.read..].len());
+				buffer[0..read].copy_from_slice(&req.response[req.read..read]);
+				req.read += read;
+				Ok(read)
+			}
+		} else {
+			Err(HttpError::IoError)
+		}
+	}
+}
+