Add span decoder for slices

data-pipeline/src/trace_exporter/mod.rs

@@ -588,7 +588,7 @@ impl TraceExporter {
 
     fn send_deser_ser(&self, data: tinybytes::Bytes) -> Result<String, TraceExporterError> {
         // TODO base on input format
-        let (mut traces, size) = match msgpack_decoder::v04::decoder::from_slice(data) {
+        let (mut traces, size) = match msgpack_decoder::v04::decoder::from_bytes(data) {
             Ok(res) => res,
             Err(err) => {
                 error!("Error deserializing trace from request body: {err}");

tinybytes/src/bytes_string.rs

@@ -82,6 +82,21 @@ impl BytesString {
         }
     }
 
+    /// Creates a `BytesString` from a string slice within the given buffer.
+    ///
+    /// # Arguments
+    ///
+    /// * `bytes` - A `tinybytes::Bytes` instance that will be converted into a `BytesString`.
+    /// * `slice` - The string slice pointing into the given bytes that will form the `BytesString`.
+    pub fn try_from_bytes_slice(bytes: &Bytes, slice: &str) -> Option<Self> {
+        // SAFETY: This is safe as a str slice is definitely a valid UTF-8 slice.
+        unsafe {
+            Some(Self::from_bytes_unchecked(
+                bytes.slice_ref(slice.as_bytes())?,
+            ))
+        }
+    }
+
     /// Creates a `BytesString` from a `tinybytes::Bytes` instance without validating the bytes.
     ///
     /// This function does not perform any validation on the provided bytes, and assumes that the

trace-utils/src/msgpack_decoder/mod.rs

@@ -1,4 +1,5 @@
 // Copyright 2024-Present Datadog, Inc. https://www.datadoghq.com/
 // SPDX-License-Identifier: Apache-2.0
 
+/// Decoding logic for V04 encoded trace payload
 pub mod v04;