Merging upstream version 1.44.3.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 59 insertions, 0 deletions

diff --git a/fluent-bit/examples/filter_rust/README.md b/fluent-bit/examples/filter_rust/README.md
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+# Fluent Bit / filter_rust
+
+This source source tree provides an example of WASM program with WASI mode mainly written in Rust.
+
+## Prerequisites
+
+* Rust
+  * rustc 1.61.0 (fe5b13d68 2022-05-18)
+* [rustup](https://rustup.rs/) (For preparing rust compiler and toolchains)
+
+## How to build
+
+Add `wasm32-unknown-unknown` target for Rust toolchain:
+
+```console
+$ rustup target add wasm32-unknown-unknown
+```
+
+Then, execute _cargo build_ as follows:
+
+```console
+$ cargo build --target wasm32-unknown-unknown --release
+```
+
+Finally, `*.wasm` file will be created:
+
+```console
+$ ls target/wasm32-unknown-unknown/release/*.wasm
+target/wasm32-unknown-unknown/release/filter_rust.wasm
+```
+
+## How to confirm WASM filter integration
+
+Create fluent-bit configuration file as follows:
+
+```ini
+[SERVICE]
+    Flush        1
+    Daemon       Off
+    Log_Level    info
+    HTTP_Server  Off
+    HTTP_Listen  0.0.0.0
+    HTTP_Port    2020
+
+[INPUT]
+    Name dummy
+    Tag  dummy.local
+
+[FILTER]
+    Name   wasm
+    match  dummy.*
+    WASM_Path /path/to/filter_rust.wasm
+    Function_Name rust_filter
+    accessible_paths .,/path/to/fluent-bit
+
+[OUTPUT]
+    Name  stdout
+    Match *
+```