s3ql 0.1.3

Query Language for S3
Documentation 
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use async_trait::async_trait;
use rusoto_core::RusotoError;
use rusoto_s3::{
    GetObjectError, GetObjectOutput, GetObjectRequest, HeadObjectError, HeadObjectRequest,
    ListObjectsV2Error, ListObjectsV2Output, ListObjectsV2Request, S3Client, S3,
};
use tokio::io::AsyncReadExt;

#[async_trait]
pub trait Readable: S3 {
    async fn read_s3_object(
        &self,
        bucket_name: String,
        key: String,
        if_id_matches: Option<String>,
        if_modified_since: Option<String>,
        if_unmodified_since: Option<String>,
    ) -> Result<GetObjectOutput, RusotoError<GetObjectError>>;

    async fn read_s3_object_body(
        &self,
        bucket_name: String,
        key: String,
        if_id_matches: Option<String>,
        if_modified_since: Option<String>,
        if_unmodified_since: Option<String>,
    ) -> Option<String>;

    async fn has_s3_object(
        &self,
        bucket_name: String,
        key: String,
        if_id_matches: Option<String>,
        if_modified_since: Option<String>,
        if_unmodified_since: Option<String>,
    ) -> Result<(), RusotoError<HeadObjectError>>;

    async fn show_s3_objects(
        &self,
        bucket_name: String,
        max_keys: Option<i64>,
    ) -> Result<ListObjectsV2Output, RusotoError<ListObjectsV2Error>>;
}

#[async_trait]
impl Readable for S3Client {
    async fn read_s3_object(
        &self,
        bucket_name: String,
        key: String,
        if_id_matches: Option<String>,
        if_modified_since: Option<String>,
        if_unmodified_since: Option<String>,
    ) -> Result<GetObjectOutput, RusotoError<GetObjectError>> {
        let get_object = GetObjectRequest {
            bucket: bucket_name,
            key,
            if_match: if_id_matches,
            if_modified_since,
            if_unmodified_since,
            ..Default::default()
        };

        self.get_object(get_object).await
    }

    async fn read_s3_object_body(
        &self,
        bucket_name: String,
        key: String,
        if_id_matches: Option<String>,
        if_modified_since: Option<String>,
        if_unmodified_since: Option<String>,
    ) -> Option<String> {
        let get_object = GetObjectRequest {
            bucket: bucket_name,
            key,
            if_match: if_id_matches,
            if_modified_since,
            if_unmodified_since,
            ..Default::default()
        };

        match self.get_object(get_object).await {
            Err(_) => None,
            Ok(obj) => {
                if let Some(obj_body) = obj.body {
                    let mut stream = obj_body.into_async_read();
                    let mut body = Vec::new();
                    stream.read_to_end(&mut body).await.ok();

                    String::from_utf8(body).ok()
                } else {
                    None
                }
            }
        }
    }

    async fn has_s3_object(
        &self,
        bucket_name: String,
        key: String,
        if_id_matches: Option<String>,
        if_modified_since: Option<String>,
        if_unmodified_since: Option<String>,
    ) -> Result<(), RusotoError<HeadObjectError>> {
        let head_object = HeadObjectRequest {
            bucket: bucket_name,
            key,
            if_match: if_id_matches,
            if_modified_since,
            if_unmodified_since,
            ..Default::default()
        };

        match self.head_object(head_object).await {
            Err(e) => Err(e),
            Ok(_) => Ok(()),
        }
    }

    async fn show_s3_objects(
        &self,
        bucket_name: String,
        max_keys: Option<i64>,
    ) -> Result<ListObjectsV2Output, RusotoError<ListObjectsV2Error>> {
        let list_objs = ListObjectsV2Request {
            bucket: bucket_name,
            max_keys,
            ..Default::default()
        };

        self.list_objects_v2(list_objs).await
    }
}