Remove ciborium in favor of custom deserialization logic

Unfortunately, looks like serde is not flexible enough to support everything CBOR does,
so a lot of messages cannot be deserialized properly. Other serde-based CBOR libraries
suffer from the same problem.

So now we have a bunch of boring deserialization logic supported by sk-cbor

Cargo.lock

@@ -437,33 +437,6 @@ dependencies = [
  "windows-targets",
 ]
 
-[[package]]
-name = "ciborium"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "effd91f6c78e5a4ace8a5d3c0b6bfaec9e2baaef55f3efc00e45fb2e477ee926"
-dependencies = [
- "ciborium-io",
- "ciborium-ll",
- "serde",
-]
-
-[[package]]
-name = "ciborium-io"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cdf919175532b369853f5d5e20b26b43112613fd6fe7aee757e35f7a44642656"
-
-[[package]]
-name = "ciborium-ll"
-version = "0.2.1"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "defaa24ecc093c77630e6c15e17c51f5e187bf35ee514f4e2d67baaa96dae22b"
-dependencies = [
- "ciborium-io",
- "half",
-]
-
 [[package]]
 name = "cid"
 version = "0.10.1"
@@ -1035,12 +1008,6 @@ dependencies = [
  "tracing",
 ]
 
-[[package]]
-name = "half"
-version = "1.8.2"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "eabb4a44450da02c90444cf74558da904edde8fb4e9035a9a6a4e15445af0bd7"
-
 [[package]]
 name = "hashbrown"
 version = "0.12.3"
@@ -2341,7 +2308,6 @@ dependencies = [
  "axum",
  "chat-gpt-lib-rs",
  "chrono",
- "ciborium",
  "clap",
  "dotenv",
  "env_logger",
@@ -2354,6 +2320,7 @@ dependencies = [
  "scooby",
  "serde",
  "serde_ipld_dagcbor",
+ "sk-cbor",
  "sqlx",
  "tokio",
  "tokio-tungstenite",
@@ -3091,6 +3058,12 @@ dependencies = [
  "rand_core",
 ]
 
+[[package]]
+name = "sk-cbor"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7e94879a793aba6e65d691f345cfd172c4cc924a78259d5f9612a2cbfb78847a"
+
 [[package]]
 name = "slab"
 version = "0.4.9"

Cargo.toml

@@ -14,7 +14,6 @@ atrium-xrpc = "0.4.0"
 axum = "0.6.20"
 chat-gpt-lib-rs = "0.2.1"
 chrono = "0.4.31"
-ciborium = "0.2.1"
 clap = { version = "4.4.4", features = ["derive"] }
 dotenv = "0.15.0"
 env_logger = "0.10.0"
@@ -27,6 +26,7 @@ rs-car = "0.4.1"
 scooby = "0.5.0"
 serde = "1.0.188"
 serde_ipld_dagcbor = "0.4.2"
+sk-cbor = "0.1.2"
 sqlx = { version = "0.7.1", default-features = false, features = ["postgres", "runtime-tokio-native-tls", "chrono"] }
 tokio = { version = "1.32.0", features = ["full"] }
 tokio-tungstenite = { version = "0.20.0", features = ["native-tls"] }

src/services/bluesky.rs

@@ -1,6 +1,7 @@
 mod client;
 mod proto;
 mod streaming;
+mod decode;
 
 pub use client::Bluesky;
 pub use streaming::{CommitDetails, CommitProcessor, Operation};

src/services/bluesky/decode.rs

@@ -0,0 +1,154 @@
+use sk_cbor::Value;
+use anyhow::{Result, Error, anyhow};
+
+type CborMap = Vec<(Value, Value)>;
+
+pub struct PostRecord {
+    pub langs: Option<Vec<String>>,
+    pub text: String
+}
+
+impl TryFrom<&CborMap> for PostRecord {
+    type Error = Error;
+
+    fn try_from(root: &CborMap) -> Result<Self> {
+        let mut text: Option<&str> = None;
+        let mut langs: Option<Vec<&str>> = None;
+
+        for (key, value) in iter_string_keys(&root) {
+            match key {
+                "text" => { text = Some(string(value)?) },
+                "langs" => { langs = Some(array_of_strings(value)?) },
+                _ => continue,
+            }
+        }
+
+        Ok(PostRecord {
+            text: text.ok_or_else(|| anyhow!("Missing field: text"))?.to_owned(),
+            langs: langs.map(|v| v.into_iter().map(str::to_owned).collect()),
+        })
+    }
+}
+
+pub struct LikeRecord {
+    pub subject: Subject,
+}
+
+impl TryFrom<&CborMap> for LikeRecord {
+    type Error = Error;
+
+    fn try_from(root: &CborMap) -> Result<Self> {
+        let mut subject = None;
+
+        for (key, value) in iter_string_keys(&root) {
+            match key {
+                "subject" => { subject = Some(map(value)?.try_into()?) },
+                _ => continue,
+            }
+        }
+
+        Ok(LikeRecord { 
+            subject: subject.ok_or_else(|| anyhow!("Missing field: subject"))?
+        })
+    }
+}
+
+pub struct Subject {
+    pub cid: String,
+    pub uri: String,
+}
+
+impl TryFrom<&CborMap> for Subject {
+    type Error = Error;
+
+    fn try_from(root: &CborMap) -> Result<Self> {
+        let mut cid = None;
+        let mut uri = None;
+
+        for (key, value) in iter_string_keys(&root) {
+            match key {
+                "cid" => { cid = Some(string(value)?) },
+                "uri" => { uri = Some(string(value)?) },
+                _ => continue,
+            }
+        }
+
+        Ok(Subject {
+            cid: cid.ok_or_else(|| anyhow!("Missing field: cid"))?.to_owned(),
+            uri: uri.ok_or_else(|| anyhow!("Missing field: uri"))?.to_owned(),
+        })
+    }
+}
+
+pub struct FollowRecord {
+    pub subject: String,
+}
+
+impl TryFrom<&CborMap> for FollowRecord {
+    type Error = Error;
+
+    fn try_from(root: &CborMap) -> Result<Self> {
+        let mut subject = None;
+
+        for (key, value) in iter_string_keys(&root) {
+            match key {
+                "subject" => { subject = Some(string(value)?) },
+                _ => continue,
+            }
+        }
+
+        Ok(FollowRecord {
+            subject: subject.ok_or_else(|| anyhow!("Missing field: subject"))?.to_owned(),
+        })
+    }
+}
+
+pub fn read_record<T: for<'a> TryFrom<&'a CborMap, Error = Error>>(bytes: &[u8]) -> Result<T> {
+    let root = match sk_cbor::read(bytes) {
+        Err(_) => return Err(anyhow!("Could not decode anything")),
+        Ok(v) => v
+    };
+
+    let root_map = match root {
+        Value::Map(m) => m,
+        _ => return Err(anyhow!("Expected root object to be a map")),
+    };
+
+    (&root_map).try_into()
+}
+
+fn iter_string_keys(map: &CborMap) -> impl Iterator<Item = (&str, &Value)> {
+    map.into_iter().flat_map(|(k, v)| {
+        match k {
+            Value::TextString(k) => Some((k.as_str(), v)),
+            _ => None
+        }
+    })
+}
+
+fn map(value: &Value) -> Result<&CborMap> {
+    match value {
+        Value::Map(m) => Ok(m),
+        _ => Err(anyhow!("Expected a map")),
+    }
+}
+
+fn string(value: &Value) -> Result<&str> {
+    match value {
+        Value::TextString(value) => Ok(value.as_str()),
+        _ => Err(anyhow!("Expected string"))
+    }
+}
+
+fn array_of_strings(value: &Value) -> Result<Vec<&str>> {
+    match value {
+        Value::Array(vec) => {
+            let mut res = Vec::with_capacity(vec.len());
+            for vec_value in vec {
+                res.push(string(&vec_value)?)
+            }
+            Ok(res)
+        }
+        _ => Err(anyhow!("Expected array"))
+    }
+}

src/services/bluesky/streaming.rs

@@ -4,7 +4,7 @@ use anyhow::Result;
 use async_trait::async_trait;
 use atrium_api::com::atproto::sync::subscribe_repos::{Commit, Message};
 
-use super::proto::Frame;
+use super::{proto::Frame, decode::{read_record, PostRecord, LikeRecord, FollowRecord}};
 
 const COLLECTION_POST: &str = "app.bsky.feed.post";
 const COLLECTION_LIKE: &str = "app.bsky.feed.like";
@@ -109,9 +109,7 @@ async fn extract_operations(commit: &Commit) -> Result<Vec<Operation>> {
 
                 match collection {
                     COLLECTION_POST => {
-                        use atrium_api::app::bsky::feed::post::Record;
-
-                        let record: Record = ciborium::from_reader(&mut block.as_slice())?;
+                        let record: PostRecord = read_record(&block)?;
 
                         Operation::CreatePost {
                             author_did: commit.repo.clone(),
@@ -122,9 +120,7 @@ async fn extract_operations(commit: &Commit) -> Result<Vec<Operation>> {
                         }
                     }
                     COLLECTION_LIKE => {
-                        use atrium_api::app::bsky::feed::like::Record;
-
-                        let record: Record = ciborium::from_reader(&mut block.as_slice())?;
+                        let record: LikeRecord = read_record(&block)?;
 
                         Operation::CreateLike {
                             author_did: commit.repo.clone(),
@@ -135,9 +131,7 @@ async fn extract_operations(commit: &Commit) -> Result<Vec<Operation>> {
                         }
                     }
                     COLLECTION_FOLLOW => {
-                        use atrium_api::app::bsky::graph::follow::Record;
-
-                        let record: Record = ciborium::from_reader(&mut block.as_slice())?;
+                        let record: FollowRecord = read_record(&block)?;
 
                         Operation::CreateFollow {
                             author_did: commit.repo.clone(),