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proxy_wasm_intrinsics.cc
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proxy_wasm_intrinsics.cc
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// Copyright 2016-2019 Envoy Project Authors
// Copyright 2020 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// NOLINT(namespace-envoy)
#include "proxy_wasm_intrinsics.h"
// Required Proxy-Wasm ABI version.
extern "C" PROXY_WASM_KEEPALIVE void proxy_abi_version_0_2_1() {}
static std::unordered_map<std::string, RootFactory> *root_factories = nullptr;
static std::unordered_map<std::string, ContextFactory> *context_factories = nullptr;
static std::unordered_map<int32_t, std::unique_ptr<ContextBase>> context_map;
static std::unordered_map<std::string, RootContext *> root_context_map;
RegisterContextFactory::RegisterContextFactory(ContextFactory context_factory,
RootFactory root_factory, std::string_view root_id) {
if (!root_factories) {
root_factories = new std::unordered_map<std::string, RootFactory>;
context_factories = new std::unordered_map<std::string, ContextFactory>;
}
if (context_factory)
(*context_factories)[std::string(root_id)] = context_factory;
if (root_factory)
(*root_factories)[std::string(root_id)] = root_factory;
}
static Context *ensureContext(uint32_t context_id, uint32_t root_context_id) {
auto e = context_map.insert(std::make_pair(context_id, nullptr));
if (e.second) {
RootContext *root = context_map[root_context_id].get()->asRoot();
std::string root_id = std::string(root->root_id());
if (!context_factories) {
e.first->second = std::make_unique<Context>(context_id, root);
return e.first->second->asContext();
}
auto factory = context_factories->find(root_id);
if (factory == context_factories->end()) {
e.first->second = std::make_unique<Context>(context_id, root);
return e.first->second->asContext();
} else {
e.first->second = factory->second(context_id, root);
}
}
return e.first->second->asContext();
}
static RootContext *ensureRootContext(uint32_t context_id) {
auto it = context_map.find(context_id);
if (it != context_map.end()) {
return it->second->asRoot();
}
const char *root_id_ptr = nullptr;
size_t root_id_size = 0;
CHECK_RESULT(proxy_get_property("plugin_root_id", sizeof("plugin_root_id") - 1, &root_id_ptr,
&root_id_size));
auto root_id = std::make_unique<WasmData>(root_id_ptr, root_id_size);
auto root_id_string = root_id->toString();
if (!root_factories) {
auto context = std::make_unique<RootContext>(context_id, root_id->view());
RootContext *root_context = context->asRoot();
context_map[context_id] = std::move(context);
root_context_map[root_id_string] = root_context;
return root_context;
}
auto factory = root_factories->find(root_id_string);
RootContext *root_context;
if (factory != root_factories->end()) {
auto context = factory->second(context_id, root_id->view());
root_context = context->asRoot();
root_context_map[root_id_string] = root_context;
context_map[context_id] = std::move(context);
} else {
auto context = std::make_unique<RootContext>(context_id, root_id->view());
root_context = context->asRoot();
context_map[context_id] = std::move(context);
root_context_map[root_id_string] = root_context;
}
return root_context;
}
ContextBase *getContextBase(uint32_t context_id) {
auto it = context_map.find(context_id);
if (it == context_map.end()) {
return nullptr;
}
return it->second.get();
}
Context *getContext(uint32_t context_id) {
auto it = context_map.find(context_id);
if (it == context_map.end() || !it->second->asContext()) {
return nullptr;
}
return it->second->asContext();
}
RootContext *getRootContext(uint32_t context_id) {
auto it = context_map.find(context_id);
if (it == context_map.end() || !it->second->asRoot()) {
return nullptr;
}
return it->second->asRoot();
}
RootContext *getRoot(std::string_view root_id) {
auto it = root_context_map.find(std::string(root_id));
if (it != root_context_map.end()) {
return it->second;
}
return nullptr;
}
extern "C" PROXY_WASM_KEEPALIVE uint32_t proxy_on_vm_start(uint32_t root_context_id,
uint32_t vm_configuration_size) {
return getRootContext(root_context_id)->onStart(vm_configuration_size);
}
extern "C" PROXY_WASM_KEEPALIVE uint32_t proxy_validate_configuration(uint32_t root_context_id,
uint32_t configuration_size) {
return getRootContext(root_context_id)->validateConfiguration(configuration_size) ? 1 : 0;
}
extern "C" PROXY_WASM_KEEPALIVE uint32_t proxy_on_configure(uint32_t root_context_id,
uint32_t configuration_size) {
return getRootContext(root_context_id)->onConfigure(configuration_size) ? 1 : 0;
}
extern "C" PROXY_WASM_KEEPALIVE void proxy_on_tick(uint32_t root_context_id) {
getRootContext(root_context_id)->onTick();
}
extern "C" PROXY_WASM_KEEPALIVE void proxy_on_context_create(uint32_t context_id,
uint32_t parent_context_id) {
if (parent_context_id) {
ensureContext(context_id, parent_context_id)->onCreate();
} else {
ensureRootContext(context_id)->onCreate();
}
}
extern "C" PROXY_WASM_KEEPALIVE FilterStatus proxy_on_new_connection(uint32_t context_id) {
return getContext(context_id)->onNewConnection();
}
extern "C" PROXY_WASM_KEEPALIVE FilterStatus proxy_on_downstream_data(uint32_t context_id,
uint32_t data_length,
uint32_t end_of_stream) {
return getContext(context_id)
->onDownstreamData(static_cast<size_t>(data_length), end_of_stream != 0);
}
extern "C" PROXY_WASM_KEEPALIVE FilterStatus proxy_on_upstream_data(uint32_t context_id,
uint32_t data_length,
uint32_t end_of_stream) {
return getContext(context_id)
->onUpstreamData(static_cast<size_t>(data_length), end_of_stream != 0);
}
extern "C" PROXY_WASM_KEEPALIVE void proxy_on_downstream_connection_close(uint32_t context_id,
uint32_t close_type) {
return getContext(context_id)->onDownstreamConnectionClose(static_cast<CloseType>(close_type));
}
extern "C" PROXY_WASM_KEEPALIVE void proxy_on_upstream_connection_close(uint32_t context_id,
uint32_t close_type) {
return getContext(context_id)->onUpstreamConnectionClose(static_cast<CloseType>(close_type));
}
extern "C" PROXY_WASM_KEEPALIVE FilterHeadersStatus
proxy_on_request_headers(uint32_t context_id, uint32_t headers, uint32_t end_of_stream) {
return getContext(context_id)->onRequestHeaders(headers, end_of_stream != 0);
}
extern "C" PROXY_WASM_KEEPALIVE FilterMetadataStatus proxy_on_request_metadata(uint32_t context_id,
uint32_t elements) {
return getContext(context_id)->onRequestMetadata(elements);
}
extern "C" PROXY_WASM_KEEPALIVE FilterDataStatus proxy_on_request_body(uint32_t context_id,
uint32_t body_buffer_length,
uint32_t end_of_stream) {
return getContext(context_id)
->onRequestBody(static_cast<size_t>(body_buffer_length), end_of_stream != 0);
}
extern "C" PROXY_WASM_KEEPALIVE FilterTrailersStatus proxy_on_request_trailers(uint32_t context_id,
uint32_t trailers) {
return getContext(context_id)->onRequestTrailers(trailers);
}
extern "C" PROXY_WASM_KEEPALIVE FilterHeadersStatus
proxy_on_response_headers(uint32_t context_id, uint32_t headers, uint32_t end_of_stream) {
return getContext(context_id)->onResponseHeaders(headers, end_of_stream != 0);
}
extern "C" PROXY_WASM_KEEPALIVE FilterMetadataStatus proxy_on_response_metadata(uint32_t context_id,
uint32_t elements) {
return getContext(context_id)->onResponseMetadata(elements);
}
extern "C" PROXY_WASM_KEEPALIVE FilterDataStatus proxy_on_response_body(uint32_t context_id,
uint32_t body_buffer_length,
uint32_t end_of_stream) {
return getContext(context_id)
->onResponseBody(static_cast<size_t>(body_buffer_length), end_of_stream != 0);
}
extern "C" PROXY_WASM_KEEPALIVE FilterTrailersStatus proxy_on_response_trailers(uint32_t context_id,
uint32_t trailers) {
return getContext(context_id)->onResponseTrailers(trailers);
}
extern "C" PROXY_WASM_KEEPALIVE uint32_t proxy_on_done(uint32_t context_id) {
return getContextBase(context_id)->onDoneBase();
}
extern "C" PROXY_WASM_KEEPALIVE void proxy_on_log(uint32_t context_id) {
getContextBase(context_id)->onLog();
}
extern "C" PROXY_WASM_KEEPALIVE void proxy_on_delete(uint32_t context_id) {
getContextBase(context_id)->onDelete();
context_map.erase(context_id);
}
extern "C" PROXY_WASM_KEEPALIVE void proxy_on_http_call_response(uint32_t context_id,
uint32_t token, uint32_t headers,
uint32_t body_size,
uint32_t trailers) {
getRootContext(context_id)
->onHttpCallResponse(token, headers, static_cast<size_t>(body_size), trailers);
}
extern "C" PROXY_WASM_KEEPALIVE void
proxy_on_grpc_receive_initial_metadata(uint32_t context_id, uint32_t token, uint32_t headers) {
getRootContext(context_id)->onGrpcReceiveInitialMetadata(token, headers);
}
extern "C" PROXY_WASM_KEEPALIVE void
proxy_on_grpc_receive_trailing_metadata(uint32_t context_id, uint32_t token, uint32_t trailers) {
getRootContext(context_id)->onGrpcReceiveTrailingMetadata(token, trailers);
}
extern "C" PROXY_WASM_KEEPALIVE void proxy_on_grpc_receive(uint32_t context_id, uint32_t token,
uint32_t response_size) {
getRootContext(context_id)->onGrpcReceive(token, static_cast<size_t>(response_size));
}
extern "C" PROXY_WASM_KEEPALIVE void proxy_on_grpc_close(uint32_t context_id, uint32_t token,
uint32_t status_code) {
getRootContext(context_id)->onGrpcClose(token, static_cast<GrpcStatus>(status_code));
}
extern "C" PROXY_WASM_KEEPALIVE void proxy_on_queue_ready(uint32_t context_id, uint32_t token) {
getRootContext(context_id)->onQueueReady(token);
}
extern "C" PROXY_WASM_KEEPALIVE void
proxy_on_foreign_function(uint32_t context_id, uint32_t foreign_function_id, uint32_t data_size) {
getContextBase(context_id)->onForeignFunction(foreign_function_id, data_size);
}
// Patch an Emscripten gap: https://github.com/emscripten-core/emscripten/issues/22782
// Implement getentropy for RNG support (e.g. for absl::random).
typedef uint16_t __wasi_errno_t;
typedef size_t __wasi_size_t;
__wasi_errno_t __wasi_random_get(uint8_t *buf, __wasi_size_t buf_len)
__attribute__((__import_module__("wasi_snapshot_preview1"), __import_name__("random_get")));
extern "C" int getentropy(void *buffer, size_t len) {
if (len > 256) {
errno = EIO;
return -1;
}
int r = __wasi_random_get((uint8_t *)buffer, len);
if (r != 0) {
errno = r;
return -1;
}
return 0;
}