Update readme

bao-http-tool/README.md

@@ -2,16 +2,26 @@
 
 ## Usage
 
-To test this, run a http dev server that supports range requests in your iroh data dir.
+Create an outboard for an asset that is available via http:
 
-The outboard data must be *without* length prefix.
+```
+❯ bao-http-tool generate --data http://127.0.0.1:3003/370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2.data --block-size-log 4
+Computing outboard for http://127.0.0.1:3003/370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2.data of size 100000000 with block log 4, size 16384
+Computed hash: 370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2
+Writing outboard to 370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2.obao4
+```
+
+Validate a range of the file:
 
 ```
-RUST_LOG=debug \
-  cargo run -- \
-  --hash 370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2 \
-  --block-size-log 4
-  --url http://127.0.0.1:3003/370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2.data
-  --outboard http://127.0.0.1:3003/370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2.obao4
-  --range 0..10000000
-```
+validate --hash 370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2 --block-size-log 4 --data http://127.0.0.1:3003/370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2.data --outboard 370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2.obao4 --range 0..10000000
+Size: 100000000
+Outboard: 390592
+Hash: 370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2
+Block size: BlockSize(4)
+Byte ranges: RangeSet{0..10000000}
+Chunk ranges: RangeSet{0..9766}
+confirmed that range RangeSet{0..10000000} of http://127.0.0.1:3003/370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2.data matches 370e2b3002be3b38b120f7b3be53da4cf646810e26f8f4a5018247c8188af5b2
+```
+
+Note that for validation both data **and** outboard can be available via http.

bao-http-tool/src/main.rs

@@ -28,8 +28,11 @@ async fn generate(args: GenerateArgs) -> anyhow::Result<()> {
     let size = data.size().await?;
     let tree = BaoTree::new(size, block_size);
     println!(
-        "Computing outboard for {} of size {} with block size {}",
-        args.data, size, block_size
+        "Computing outboard for {} of size {} with block log {}, size {}",
+        args.data,
+        size,
+        block_size.chunk_log(),
+        block_size.bytes()
     );
     let hash =
         bao_tree::io::fsm::outboard_post_order(Cursor::new(data), tree, &mut outboard).await?;