Finishes the generate implementation

Cargo.lock

@@ -2,6 +2,28 @@
 # It is not intended for manual editing.
 version = 4
 
+[[package]]
+name = "async-stream"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b5a71a6f37880a80d1d7f19efd781e4b5de42c88f0722cc13bcb6cc2cfe8476"
+dependencies = [
+ "async-stream-impl",
+ "futures-core",
+ "pin-project-lite",
+]
+
+[[package]]
+name = "async-stream-impl"
+version = "0.3.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c7c24de15d275a1ecfd47a380fb4d5ec9bfe0933f309ed5e705b775596a3574d"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "atomic-waker"
 version = "1.1.2"
@@ -612,6 +634,7 @@ dependencies = [
 name = "ollama-rs"
 version = "0.1.0"
 dependencies = [
+ "async-stream",
  "dotenvy",
  "futures-util",
  "reqwest",

Cargo.toml

@@ -10,6 +10,7 @@ serde_json = "1.0.146"
 tokio-util = "0.7.17"
 tracing = "0.1.44"
 futures-util = "0.3.31"
+async-stream = "0.3.6"
 
 [dev-dependencies]
 dotenvy = "0.15.7"

examples/generate.rs

@@ -1,5 +1,6 @@
-use std::{env, error::Error};
+use std::{env, error::Error, io::Write};
 
+use futures_util::StreamExt;
 use ollama_rs::{OllamaClient, types::generate::GenerateRequest};
 
 #[tokio::main]
@@ -8,9 +9,21 @@ async fn main() -> Result<(), Box<dyn Error>> {
     let server_address = env::var("OLLAMA_SERVER")?;
     let ollama_client = OllamaClient::new(server_address);
     let request = GenerateRequest::builder("dolphin3:8b")
+        .system_prompt("You a role play character called Gerald. You are a dumb person who things knows a lot but PROVIDES WRONG ANSWERS to all questions.")
         .prompt("Why is the sky blue?")
         .build();
-    let response = ollama_client.generate(request).await?;
-    println!("{:?}", response);
+
+    let mut stream = ollama_client.generate(request).await;
+
+    while let Some(response) = stream.next().await {
+        match response {
+            Ok(token) => {
+                print!("{}", token.response);
+                std::io::stdout().flush()?;
+            }
+            Err(e) => println!("Error: {}", e),
+        }
+    }
+
     Ok(())
 }

src/error.rs

@@ -1,11 +1,14 @@
 use std::{error::Error, fmt::Display};
 
+use tokio_util::codec::LinesCodecError;
+
 pub type OllamaResult<T> = Result<T, OllamaError>;
 
 #[derive(Debug)]
 pub enum OllamaError {
     NetworkError(reqwest::Error),
     ResponseParseError(serde_json::Error),
+    LinesCoderError(LinesCodecError),
 }
 
 impl Error for OllamaError {}
@@ -15,6 +18,7 @@ impl Display for OllamaError {
         match self {
             OllamaError::NetworkError(e) => writeln!(f, "Network error: {}", e),
             OllamaError::ResponseParseError(e) => writeln!(f, "ResponseParseError error: {}", e),
+            OllamaError::LinesCoderError(e) => writeln!(f, "LinesCoderError error: {}", e),
         }
     }
 }
@@ -30,3 +34,9 @@ impl From<serde_json::Error> for OllamaError {
         Self::ResponseParseError(error)
     }
 }
+
+impl From<LinesCodecError> for OllamaError {
+    fn from(value: LinesCodecError) -> Self {
+        Self::LinesCoderError(value)
+    }
+}

src/lib.rs

@@ -1,10 +1,14 @@
-use futures_util::{StreamExt};
+use async_stream::stream;
+use futures_util::{Stream, StreamExt};
 use serde_json::Value;
-use tokio_util::io::StreamReader;
+use tokio_util::{
+    codec::{FramedRead, LinesCodec},
+    io::StreamReader,
+};
 use tracing::info;
 
 use crate::{
-    error::OllamaResult,
+    error::{OllamaError, OllamaResult},
     types::{
         generate::{GenerateRequest, GenerateResponse},
         ps::RunningModel,
@@ -71,32 +75,42 @@ impl OllamaClient {
     }
 
     /// Generates a response for the provided prompt
-    pub async fn generate(&self, request: GenerateRequest) -> OllamaResult<()> {
+    pub async fn generate(
+        &self,
+        request: GenerateRequest,
+    ) -> impl Stream<Item = OllamaResult<GenerateResponse>> {
         let request_address = format!("{}/api/generate", self.server_address);
         let client = reqwest::Client::new();
-        let response = client
-            .post(request_address)
-            .json(&request)
-            .send()
-            .await?
-            .error_for_status()?;
-        let stream = response.bytes_stream().;
-        // let reader = BufReader::new(stream);
-        let reader = StreamReader(stream);
-        while reader
-        while let Some(item) = stream.next().await {
-            let item = item?;
-            println!("Chunk: {:?}", item?);
-        }
 
-        // let stream_reader = tokio_util::io::StreamReader::new(stream);
-        // let reder = BufReader::new(stream);
-        // let full_response = response.text().await?;
-        // let parts = full_response
-        //     .lines()
-        //     .map(|line| serde_json::from_str::<GenerateResponse>(line).unwrap())
-        //     .collect::<Vec<_>>();
-        // println!("{:#?}", parts);
-        Ok(())
+        // The stream macro creates an asynchronous generator
+        Box::pin(stream! {
+            let response = client
+                .post(request_address)
+                .json(&request)
+                .send()
+                .await
+                .map_err(|e| OllamaError::from(e))?; // Adjust based on your error type
+
+            let bytes_stream = response.bytes_stream();
+
+            let body_reader = StreamReader::new(
+                bytes_stream.map(|res| res.map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e))),
+            );
+
+            let mut lines_stream = FramedRead::new(body_reader, LinesCodec::new());
+
+            while let Some(line_result) = lines_stream.next().await {
+                match line_result {
+                    Ok(line_content) => {
+                        if let Ok(parsed) = serde_json::from_str::<GenerateResponse>(&line_content) {
+                            let done = parsed.done;
+                            yield Ok(parsed);
+                            if done { break; }
+                        }
+                    }
+                    Err(e) => yield Err(OllamaError::from(e)),
+                }
+            }
+        })
     }
 }

src/types/generate.rs

@@ -41,6 +41,11 @@ impl GenerateRequestBuilder {
         }
     }
 
+    pub fn system_prompt<P: Into<String>>(mut self, system_prompt: P) -> Self {
+        self.generate_request.system = Some(system_prompt.into());
+        self
+    }
+
     pub fn prompt<P: Into<String>>(mut self, prompt: P) -> Self {
         self.generate_request.prompt = Some(prompt.into());
         self

src/types/mod.rs

@@ -1,3 +1,4 @@
+pub mod chat;
 pub mod common;
 pub mod generate;
 pub mod ps;