From 685e35d302873d3047ef86dd8904e769202d23cf Mon Sep 17 00:00:00 2001
From: Matthias Beyer <mail@beyermatthias.de>
Date: Wed, 20 May 2020 11:20:12 +0200
Subject: Unite ipfs-api client abstraction into one "Model" type

Signed-off-by: Matthias Beyer <mail@beyermatthias.de>
---
 src/model.rs | 151 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 151 insertions(+)
 create mode 100644 src/model.rs

(limited to 'src/model.rs')

diff --git a/src/model.rs b/src/model.rs
new file mode 100644
index 0000000..b81ea17
--- /dev/null
+++ b/src/model.rs
@@ -0,0 +1,151 @@
+//! The "model" module implements the Database-layer of the application
+
+use std::io::Cursor;
+use std::ops::Deref;
+use std::result::Result as RResult;
+use std::sync::Arc;
+
+use anyhow::Error;
+use chrono::NaiveDateTime;
+use failure::Fail;
+use futures::future::Future;
+use futures::future::FutureExt;
+use futures::stream::Stream;
+use futures::stream::StreamExt;
+use futures::stream::TryStreamExt;
+use ipfs_api::IpfsClient;
+use ipfs_api::TryFromUri;
+use serde::Serialize;
+use serde::de::DeserializeOwned;
+use serde_json::from_str as serde_json_from_str;
+use serde_json::to_string as serde_json_to_str;
+
+use crate::types::block::Block;
+use crate::types::content::Content;
+use crate::types::payload::Payload;
+use crate::types::util::IPFSHash;
+use crate::types::util::IPNSHash;
+
+#[derive(Clone)]
+pub struct Model(Arc<IpfsClient>);
+
+impl std::fmt::Debug for Model{
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> RResult<(), std::fmt::Error> {
+        write!(f, "Model")
+    }
+}
+
+impl Model {
+    pub fn new(host: &str, port: u16) -> Result<Model, Error> {
+        debug!("Creating new Model object: {}:{}", host, port);
+        IpfsClient::from_str(&format!("{}:{}", host, port))
+            .map(Arc::new)
+            .map(|c| Model(c))
+            .map_err(|e| Error::from(e.compat()))
+    }
+
+
+    //
+    //
+    // Low-level interface to the ipfs-api
+    //
+    //
+
+    pub(crate) async fn get_raw_bytes<H: AsRef<IPFSHash>>(&self, hash: H) -> Result<Vec<u8>, Error> {
+        debug!("Get: {}", hash.as_ref());
+        self.0
+            .clone()
+            .cat(hash.as_ref())
+            .map_ok(|b| b.to_vec())
+            .try_concat()
+            .map(|r| r.map_err(|e| anyhow!("UNIMPLEMENTED!()")))
+            .await
+    }
+
+    pub(crate) async fn put_raw_bytes(&self, data: Vec<u8>) -> Result<IPFSHash, Error> {
+        debug!("Put: {:?}", data);
+        self.0
+            .clone()
+            .add(Cursor::new(data))
+            .await
+            .map(|res| IPFSHash::from(res.hash))
+            .map_err(|e| anyhow!("UNIMPLEMENTED!()"))
+    }
+
+    pub(crate) async fn publish(&self, key: &str, hash: &str) -> Result<IPNSHash, Error> {
+        debug!("Publish: {:?} -> {:?}", key, hash);
+        self.0
+            .clone()
+            .name_publish(hash, false, None, None, Some(key))
+            .await
+            .map(|res| IPNSHash::from(res.value))
+            .map_err(|e| anyhow!("UNIMPLEMENTED!()"))
+    }
+
+    pub(crate) async fn resolve(&self, ipns: IPNSHash) -> Result<IPFSHash, Error> {
+        self.0
+            .clone()
+            .name_resolve(Some(&ipns), true, false)
+            .await
+            .map(|res| IPFSHash::from(res.path))
+            .map_err(|e| anyhow!("UNIMPLEMENTED!()"))
+    }
+
+    //
+    //
+    // Generic typed interface
+    //
+    //
+
+    pub(crate) async fn get_typed<H, D>(&self, hash: H) -> Result<D, Error>
+        where H: AsRef<IPFSHash>,
+              D: DeserializeOwned
+    {
+        self.get_raw_bytes(hash)
+            .await
+            .and_then(|data| {
+                debug!("Got data, building object: {:?}", data);
+
+                serde_json::from_slice(&data).map_err(|e| Error::from(e.compat()))
+            })
+    }
+
+    pub(crate) async fn put_typed<S, Ser>(&self, data: &S) -> Result<IPFSHash, Error>
+        where S: AsRef<Ser>,
+              Ser: Serialize
+    {
+        let data = serde_json_to_str(data.as_ref())?;
+        self.put_raw_bytes(data.into_bytes()).await
+    }
+
+    //
+    //
+    // Typed interface
+    //
+    //
+
+    pub async fn get_block<H>(&self, hash: H) -> Result<Block, Error>
+        where H: AsRef<IPFSHash>
+    {
+        self.get_typed(hash).await
+    }
+
+    pub async fn put_block<B>(&self, b: B) -> Result<IPFSHash, Error>
+        where B: AsRef<Block>
+    {
+        self.put_typed(b.as_ref()).await
+    }
+
+    pub async fn get_content<H>(&self, hash: H) -> Result<Content, Error>
+        where H: AsRef<IPFSHash>
+    {
+        self.get_typed(hash).await
+    }
+
+    pub async fn put_content<C>(&self, c: C) -> Result<IPFSHash, Error>
+        where C: AsRef<Content>
+    {
+        self.put_typed(c.as_ref()).await
+    }
+
+}
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