From d241f2f9ee448e95066c3a66b6b6221931ce651e Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Sun, 23 May 2021 09:00:48 +0200
Subject: Impl get subcommand

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
---
 src/cli.rs  | 14 ++++++++++++++
 src/main.rs | 23 +++++++++++++++++++++++
 2 files changed, 37 insertions(+)

diff --git a/src/cli.rs b/src/cli.rs
index 4df70fa..21b27e8 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -43,4 +43,18 @@ pub fn app<'a>() -> App<'a> {
                 .help("Post this TEXT as text/text")
             )
         )
+
+        .subcommand(App::new("get")
+            .author(crate_authors!())
+            .version(crate_version!())
+            .about("Get block")
+            .arg(Arg::with_name("head")
+                .index(1)
+                .multiple(false)
+                .takes_value(true)
+                .required(true)
+                .value_name("HEAD")
+                .help("Get HEAD block")
+            )
+        )
 }
diff --git a/src/main.rs b/src/main.rs
index 3db85d5..1b97f6d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,6 +1,7 @@
 use std::path::PathBuf;
 use std::str::FromStr;
 
+use anyhow::anyhow;
 use anyhow::Result;
 use daglib::DagBackend;
 use rand_os::OsRng;
@@ -104,6 +105,28 @@ async fn main() -> Result<()> {
             Ok(())
         },
 
+        ("get", Some(mtch)) => {
+            let head = mtch
+                .value_of("head")
+                .map(cid::Cid::from_str)
+                .transpose()?
+                .map(crate::backend::Id::from)
+                .unwrap(); // Safe by clap
+
+            let (id, node) = backend
+                .get(head.clone())
+                .await?
+                .ok_or_else(|| anyhow!("Not found: {:?}", head))?;
+
+            let payload = backend.ipfs().fetch(node.payload_id(), backend.ipfs().peers()).await?;
+            let payload = payload.decode::<libipld::cbor::DagCborCodec, crate::backend::Payload>()?;
+
+            println!("id      = {:?}", id);
+            println!("node    = {:?}", node);
+            println!("payload = {:?}", payload);
+            Ok(())
+        },
+
         (other, _) => {
             unimplemented!()
         },
-- 
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