feat(indexer): add extension .bin.gz to blocks chunks files

indexer/src/blocks_chunks.rs

@@ -19,6 +19,8 @@ use flate2::write::ZlibEncoder;
 use flate2::Compression;
 
 const CHUNK_SIZE: u32 = 4_096;
+const CHUNK_FILE_PREFIX: &str = "_";
+const CHUNK_FILE_EXT: &str = ".bin.gz";
 
 pub fn apply_block_blocks_chunk<B: Backend>(
     block: &DubpBlockV10,
@@ -60,7 +62,10 @@ fn read_and_remove_compressed_chunk(
     chunk_index: u32,
     chunks_folder_path: &Path,
 ) -> std::io::Result<Option<Vec<u8>>> {
-    let file_path = chunks_folder_path.join(format!("_{}", chunk_index));
+    let file_path = chunks_folder_path.join(format!(
+        "{}{}{}",
+        CHUNK_FILE_PREFIX, chunk_index, CHUNK_FILE_EXT
+    ));
     if !file_path.exists() {
         return Ok(None);
     }
@@ -86,7 +91,10 @@ fn write_and_compress_chunk_in_file(
     if !chunks_folder_path.exists() {
         std::fs::create_dir(chunks_folder_path)?;
     }
-    let file = std::fs::File::create(chunks_folder_path.join(format!("_{}", chunk_index)))?;
+    let file = std::fs::File::create(chunks_folder_path.join(format!(
+        "{}{}{}",
+        CHUNK_FILE_PREFIX, chunk_index, CHUNK_FILE_EXT
+    )))?;
     let mut e = ZlibEncoder::new(file, Compression::new(3));
     e.write_all(chunk)?;
     e.finish()?;