Rust/rusty: Add uwr_get_http_content_str()

This function is like uwr_get_http_content() except that it returns a
Rust str.

This is more convenient if you want to operate on the body content
within Rust.

It's worth noting that uwr_get_http_content() returns a non null
terminated buffer which makes it tricky to work with in Rust.

Signed-off-by: Andrew Clayton <a.clayton@nginx.com>

2 files changed, 21 insertions, 0 deletions

diff --git a/API-Rust.md b/API-Rust.md
index 7520384..8e2b6a9 100644
--- a/API-Rust.md
+++ b/API-Rust.md
@@ -64,6 +64,7 @@ and there isn't a real need to create wrappers specifically for them.
   * [uwr_get_http_local_port](#uwr_get_http_local_port)
   * [uwr_get_http_server_name](#uwr_get_http_server_name)
   * [uwr_get_http_content](#uwr_get_http_content)
+  * [uwr_get_http_content_str](#uwr_get_http_content_str)
   * [uwr_get_http_content_len](#uwr_get_http_content_len)
   * [uwr_get_http_content_sent](#uwr_get_http_content_sent)
   * [uwr_http_is_tls](#uwr_http_is_tls)
@@ -592,6 +593,14 @@ pub fn uwr_get_http_content(ctx: *const luw_ctx_t) -> *const u8;
 
 This function returns a pointer to the start of the request body.
 
+### uwr_get_http_content_str
+
+```Rsut
+pub fn uwr_get_http_content_str(ctx: *const luw_ctx_t) -> &'static str;
+```
+
+Same as above but returns a Rust str.
+
 ### uwr_get_http_content_len
 
 ```Rust
diff --git a/src/rust/unit-wasm-sys/rusty.rs b/src/rust/unit-wasm-sys/rusty.rs
index 3c96d02..3bff4df 100644
--- a/src/rust/unit-wasm-sys/rusty.rs
+++ b/src/rust/unit-wasm-sys/rusty.rs
@@ -9,6 +9,8 @@ use std::ffi::c_char;
 use std::ffi::c_void;
 use std::ffi::CStr;
 use std::ptr::null_mut;
+use std::slice;
+use std::str;
 
 #[macro_export]
 macro_rules! C2S {
@@ -101,6 +103,16 @@ pub fn uwr_get_http_content_len(ctx: *const luw_ctx_t) -> usize {
     unsafe { luw_get_http_content_len(ctx) }
 }
 
+pub fn uwr_get_http_content_str(ctx: *const luw_ctx_t) -> &'static str {
+    unsafe {
+        let slice = slice::from_raw_parts(
+            uwr_get_http_content(ctx),
+            uwr_get_http_content_len(ctx),
+        );
+        str::from_utf8(slice).unwrap()
+    }
+}
+
 pub fn uwr_get_http_content_sent(ctx: *const luw_ctx_t) -> usize {
     unsafe { luw_get_http_content_sent(ctx) }
 }