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// Presents an interface to a storage backend such as s3 or local disk.
// The interface is a simple key-value store, which maps to s3 well.
// For now the interface fetches a file and stores it at a specific
// location on disk. This is not ideal for s3, but it is a start.
// Ideally we would support streaming the file from s3 to the index
// but the current implementation of hnswlib makes this complicated.
// Once we move to our own implementation of hnswlib we can support
// streaming from s3.
use super::{config::StorageConfig, Storage};
use crate::config::{Configurable, WorkerConfig};
use crate::errors::ChromaError;
use async_trait::async_trait;
use aws_sdk_s3;
use aws_sdk_s3::error::SdkError;
use aws_sdk_s3::operation::create_bucket::CreateBucketError;
use aws_smithy_types::byte_stream::ByteStream;
use std::clone::Clone;
use std::io::Write;
#[derive(Clone)]
struct S3Storage {
bucket: String,
client: aws_sdk_s3::Client,
}
impl S3Storage {
fn new(bucket: &str, client: aws_sdk_s3::Client) -> S3Storage {
return S3Storage {
bucket: bucket.to_string(),
client: client,
};
}
async fn create_bucket(&self) -> Result<(), String> {
// Creates a public bucket with default settings in the region.
// This should only be used for testing and in production
// the bucket should be provisioned ahead of time.
let res = self
.client
.create_bucket()
.bucket(self.bucket.clone())
.send()
.await;
match res {
Ok(_) => {
println!("created bucket {}", self.bucket);
return Ok(());
}
Err(e) => match e {
SdkError::ServiceError(err) => match err.into_err() {
CreateBucketError::BucketAlreadyExists(msg) => {
println!("bucket already exists: {}", msg);
return Ok(());
}
CreateBucketError::BucketAlreadyOwnedByYou(msg) => {
println!("bucket already owned by you: {}", msg);
return Ok(());
}
e => {
println!("error: {}", e.to_string());
return Err::<(), String>(e.to_string());
}
},
_ => {
println!("error: {}", e);
return Err::<(), String>(e.to_string());
}
},
}
}
}
#[async_trait]
impl Configurable for S3Storage {
async fn try_from_config(config: &WorkerConfig) -> Result<Self, Box<dyn ChromaError>> {
match &config.storage {
StorageConfig::S3(s3_config) => {
let config = aws_config::load_from_env().await;
let client = aws_sdk_s3::Client::new(&config);
let storage = S3Storage::new(&s3_config.bucket, client);
return Ok(storage);
}
}
}
}
#[async_trait]
impl Storage for S3Storage {
async fn get(&self, key: &str, path: &str) -> Result<(), String> {
let mut file = std::fs::File::create(path);
let res = self
.client
.get_object()
.bucket(self.bucket.clone())
.key(key)
.send()
.await;
match res {
Ok(mut res) => {
match file {
Ok(mut file) => {
while let bytes = res.body.next().await {
match bytes {
Some(bytes) => match bytes {
Ok(bytes) => {
file.write_all(&bytes).unwrap();
}
Err(e) => {
println!("error: {}", e);
return Err::<(), String>(e.to_string());
}
},
None => {
// Stream is done
return Ok(());
}
}
}
}
Err(e) => {
println!("error: {}", e);
return Err::<(), String>(e.to_string());
}
}
return Ok(());
}
Err(e) => {
println!("error: {}", e);
return Err::<(), String>(e.to_string());
}
}
}
async fn put(&self, key: &str, path: &str) -> Result<(), String> {
// Puts from a file on disk to s3.
let bytestream = ByteStream::from_path(path).await;
match bytestream {
Ok(bytestream) => {
let res = self
.client
.put_object()
.bucket(self.bucket.clone())
.key(key)
.body(bytestream)
.send()
.await;
match res {
Ok(_) => {
println!("put object {} to bucket {}", key, self.bucket);
return Ok(());
}
Err(e) => {
println!("error: {}", e);
return Err::<(), String>(e.to_string());
}
}
}
Err(e) => {
println!("error: {}", e);
return Err::<(), String>(e.to_string());
}
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use tempfile::tempdir;
#[tokio::test]
#[cfg(CHROMA_KUBERNETES_INTEGRATION)]
async fn test_get() {
// Set up credentials assuming minio is running locally
let cred = aws_sdk_s3::config::Credentials::new(
"minio",
"minio123",
None,
None,
"loaded-from-env",
);
// Set up s3 client
let config = aws_sdk_s3::config::Builder::new()
.endpoint_url("http://127.0.0.1:9000".to_string())
.credentials_provider(cred)
.behavior_version_latest()
.region(aws_sdk_s3::config::Region::new("us-east-1"))
.force_path_style(true)
.build();
let client = aws_sdk_s3::Client::from_conf(config);
let storage = S3Storage {
bucket: "test".to_string(),
client: client,
};
storage.create_bucket().await.unwrap();
// Write some data to a test file, put it in s3, get it back and verify its contents
let tmp_dir = tempdir().unwrap();
let persist_path = tmp_dir.path().to_str().unwrap().to_string();
let test_data = "test data";
let test_file_in = format!("{}/test_file_in", persist_path);
let test_file_out = format!("{}/test_file_out", persist_path);
std::fs::write(&test_file_in, test_data).unwrap();
storage.put("test", &test_file_in).await.unwrap();
storage.get("test", &test_file_out).await.unwrap();
let contents = std::fs::read_to_string(test_file_out).unwrap();
assert_eq!(contents, test_data);
}
}
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