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Add metadata example #289

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1 change: 1 addition & 0 deletions README.md
Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@
- [HTTP Response body](./examples/http_body/)
- [HTTP Configuration](./examples/http_config/)
- [gRPC Auth (random)](./examples/grpc_auth_random/)
- [Filter metadata](./examples/filter_metadata/)

## Articles & blog posts from the community

Expand Down
21 changes: 21 additions & 0 deletions examples/filter_metadata/Cargo.toml
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[package]
publish = false
name = "proxy-wasm-example-filter-metadata"
version = "0.0.1"
authors = ["Martijn Swaagma <[email protected]>"]
description = "Proxy-Wasm plugin example: Filter metadata"
license = "Apache-2.0"
edition = "2018"

[lib]
crate-type = ["cdylib"]

[dependencies]
proxy-wasm = { path = "../../" }

[profile.release]
lto = true
opt-level = 3
codegen-units = 1
panic = "abort"
strip = "debuginfo"
33 changes: 33 additions & 0 deletions examples/filter_metadata/README.md
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## Proxy-Wasm plugin example: Metadata

Proxy-Wasm plugin that demonstrates reading metadata set by other filters

### Building

```sh
$ cargo build --target wasm32-wasip1 --release
```

### Using in Envoy

This example can be run with [`docker compose`](https://docs.docker.com/compose/install/)
and has a matching Envoy configuration.

```sh
$ docker compose up
```

Send a HTTP request to `localhost:10000/` will return the configured response.

```sh
$ curl localhost:10000/
Welcome, set the `x-custom-metadata` header to change the response!
```


Send a HTTP request to `localhost:10000/` with a `x-custom-metadata` header value.

```sh
$ curl localhost:10000/ -H "x-custom-metadata: some-value"
Custom response with `x-custom-metadata` value "some-value"
```
27 changes: 27 additions & 0 deletions examples/filter_metadata/docker-compose.yaml
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# Copyright 2022 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.

services:
envoy:
image: envoyproxy/envoy:v1.31-latest
hostname: envoy
ports:
- "10000:10000"
volumes:
- ./envoy.yaml:/etc/envoy/envoy.yaml
- ./target/wasm32-wasip1/release:/etc/envoy/proxy-wasm-plugins
networks:
- envoymesh
networks:
envoymesh: {}
73 changes: 73 additions & 0 deletions examples/filter_metadata/envoy.yaml
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@@ -0,0 +1,73 @@
# Copyright 2022 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.

static_resources:
listeners:
address:
socket_address:
address: 0.0.0.0
port_value: 10000
filter_chains:
- filters:
- name: envoy.filters.network.http_connection_manager
typed_config:
"@type": type.googleapis.com/envoy.extensions.filters.network.http_connection_manager.v3.HttpConnectionManager
stat_prefix: ingress_http
codec_type: AUTO
route_config:
name: local_routes
virtual_hosts:
- name: local_service
domains:
- "*"
routes:
- match:
prefix: "/"
direct_response:
status: 200
body:
inline_string: "Welcome, set the `x-custom-metadata` header to change the response!\n"
http_filters:
# Set metadata
- name: envoy.filters.http.lua
typed_config:
"@type": type.googleapis.com/envoy.extensions.filters.http.lua.v3.Lua
default_source_code:
inline_string: |
function envoy_on_request(request_handle)
local headers = request_handle:headers()
local data = headers:get("x-custom-metadata")

if data then
request_handle:streamInfo():dynamicMetadata():set("envoy.filters.http.lua", "x-custom-metadata", data)
end

request_handle:logInfo("Metadata set by lua filter")
end
# Read it from a WASM filter
- name: envoy.filters.http.wasm
typed_config:
"@type": type.googleapis.com/udpa.type.v1.TypedStruct
type_url: type.googleapis.com/envoy.extensions.filters.http.wasm.v3.Wasm
value:
config:
name: "metadata_filter"
vm_config:
runtime: "envoy.wasm.runtime.v8"
code:
local:
filename: "/etc/envoy/proxy-wasm-plugins/proxy_wasm_example_filter_metadata.wasm"
- name: envoy.filters.http.router
typed_config:
"@type": type.googleapis.com/envoy.extensions.filters.http.router.v3.Router
56 changes: 56 additions & 0 deletions examples/filter_metadata/src/lib.rs
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// 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.

use proxy_wasm::traits::*;
use proxy_wasm::types::*;

proxy_wasm::main! {{
proxy_wasm::set_log_level(LogLevel::Trace);
proxy_wasm::set_http_context(|_, _| -> Box<dyn HttpContext> { Box::new(MetadataHttp {}) });
}}

struct MetadataHttp {}

impl Context for MetadataHttp {}

impl HttpContext for MetadataHttp {
fn on_http_request_headers(&mut self, _: usize, _: bool) -> Action {
// Read data set by the lua filter
match self.get_property(vec![
"metadata",
"filter_metadata",
"envoy.filters.http.lua",
"x-custom-metadata",
]) {
Some(metadata) => match String::from_utf8(metadata) {
Ok(data) => {
self.send_http_response(
200,
vec![("Powered-By", "proxy-wasm")],
Some(
format!(
"Custom response with `x-custom-metadata` value {:?}!\n",
data
)
.as_bytes(),
),
);
Action::Pause
}
_ => Action::Continue,
},
_ => Action::Continue,
}
}
}
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