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- "heck",
- "hex",
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- "log",
- "mime",
- "openssl",
- "rand 0.6.5",
- "secp256k1",
- "serde",
- "serde_json",
- "serde_qs",
- "thiserror",
- "url",
- "ya-client-model",
-]
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- "strum 0.19.5",
- "strum_macros 0.19.4",
- "thiserror",
-]
-
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- "vergen",
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-
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- "serde",
- "serde_bytes",
- "structopt",
- "strum 0.20.0",
- "strum_macros 0.20.1",
- "thiserror",
- "ya-client-model",
- "ya-service-bus",
-]
-
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- "url",
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-
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- "thiserror",
- "tokio",
- "tokio-util 0.2.0",
- "url",
- "uuid",
- "ya-sb-proto",
- "ya-sb-util",
-]
-
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-dependencies = [
- "linked-hash-map",
-]
-
-[[package]]
-name = "yarapi"
-version = "0.4.0"
-dependencies = [
- "actix",
- "actix-rt",
- "anyhow",
- "bigdecimal",
- "chrono",
- "dotenv",
- "env_logger",
- "futures",
- "futures-core",
- "futures-util",
- "gftp",
- "log",
- "pin-project 1.0.5",
- "secp256k1",
- "semver 0.10.0",
- "serde",
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- "structopt",
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- "ya-agreement-utils",
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-]
diff --git a/Cargo.toml b/Cargo.toml
index d4e2046..83acf70 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -18,24 +18,28 @@ ya-agreement-utils = "0.2"
 
 actix = "0.9"
 actix-rt = "1.0"
-anyhow = "1.0.28"
+anyhow = "^1.0"
 bigdecimal = "0.1.0"
-chrono = "0.4.10"
-dotenv = "0.15.0"
-env_logger = "0.6"
-futures = "0.3"
+chrono = { version = "0.4.10", features = ["clock"] }
+dotenv = "^0.15.0"
+env_logger = "^0.6"
+futures = "^0.3"
 futures-core = "0.3.8"
 futures-util = "0.3.7"
-log = "0.4"
+log = "^0.4"
 pin-project = "1.0.2"
 secp256k1 = "0.17"
-semver = "0.10.0"
-serde = "1.0.118"
-serde_json = "1.0"
+semver = "^0.10.0"
+serde = "^1.0"
+serde_json = "^1.0"
 sha3 = "0.9.1"
+tempfile = "^3.1.0"
+thiserror = "^1.0"
 tokio = { version = "0.2.10", features = ["fs"] }
 url = "2.1.1"
 
+notify = "4.0.12"
+
 [dev-dependencies]
 structopt = "0.3"
 tokio = { version = "0.2.10", features = ["macros"] }
@@ -54,4 +58,4 @@ enable-all-features = true
 #ya-service-bus = { git = "https://github.com/golemfactory/ya-service-bus.git", rev = "6b494e17d7a662e0b710af8c5a2e99ab4007fdb9"}
 #ya-sb-proto = { git = "https://github.com/golemfactory/ya-service-bus.git", rev = "6b494e17d7a662e0b710af8c5a2e99ab4007fdb9"}
 ##ya-sb-router = { git = "https://github.com/golemfactory/ya-service-bus.git", rev = "6b494e17d7a662e0b710af8c5a2e99ab4007fdb9"}
-#ya-sb-util = { git = "https://github.com/golemfactory/ya-service-bus.git", rev = "6b494e17d7a662e0b710af8c5a2e99ab4007fdb9"}
\ No newline at end of file
+#ya-sb-util = { git = "https://github.com/golemfactory/ya-service-bus.git", rev = "6b494e17d7a662e0b710af8c5a2e99ab4007fdb9"}
diff --git a/src/rest.rs b/src/rest.rs
index 4efb182..5b0c936 100644
--- a/src/rest.rs
+++ b/src/rest.rs
@@ -1,9 +1,14 @@
 pub mod activity;
 mod async_drop;
 mod market;
+mod sgx;
 pub mod streaming;
+mod transfer;
 
 pub use activity::{Activity, Credentials, Event as BatchEvent, ExeScriptCommand, RunningBatch};
+pub use transfer::{
+    FileTransferError, JsonTransferError, TransferCmdError, TransferInternalError, Transfers,
+};
 pub use ya_client::web::{WebClient, WebClientBuilder};
 
 use futures::prelude::*;
@@ -36,6 +41,15 @@ impl Session {
         .await
     }
 
+    /// Creates Activity object for existing Activity. Created object
+    /// isn't owner of Activity and won't destroy it on Drop. Use for Debugging.
+    pub async fn attach_to_activity(
+        &self,
+        activity_id: &str,
+    ) -> anyhow::Result<activity::DefaultActivity> {
+        activity::DefaultActivity::attach_to_activity(self.client.interface()?, activity_id)
+    }
+
     pub async fn create_secure_activity(
         &self,
         agreement: &market::Agreement,
diff --git a/src/rest/activity.rs b/src/rest/activity.rs
index 766826a..ece1152 100644
--- a/src/rest/activity.rs
+++ b/src/rest/activity.rs
@@ -1,18 +1,21 @@
 use anyhow::{anyhow, Context, Result};
-
-use crate::rest::async_drop::{CancelableDropList, DropList};
 use futures::future::LocalBoxFuture;
 use futures::prelude::*;
-use futures::stream::LocalBoxStream;
 use futures::{FutureExt, StreamExt};
 use std::sync::Arc;
+
+use crate::rest::async_drop::DropList;
 use ya_client::activity::ActivityRequestorApi;
 pub use ya_client::activity::SecureActivityRequestorApi;
 pub use ya_client::model::activity::Credentials;
 pub use ya_client::model::activity::ExeScriptCommand;
-use ya_client::model::activity::ExeScriptRequest;
+use ya_client::model::activity::{
+    ActivityState, ActivityUsage, ExeScriptCommandState, ExeScriptRequest,
+};
 use ya_client::model::activity::{CommandResult, ExeScriptCommandResult};
 
+pub use super::sgx::{SgxActivity, SgxBatch};
+
 #[derive(Debug)]
 pub enum Event {
     StepSuccess {
@@ -72,6 +75,28 @@ impl DefaultActivity {
         })
     }
 
+    /// Debug function, that allows to attach to existing Activity.
+    pub(crate) fn attach_to_activity(
+        api: ActivityRequestorApi,
+        activity_id: &str,
+    ) -> anyhow::Result<Self> {
+        Ok(Self {
+            api,
+            activity_id: activity_id.to_string(),
+            drop_list: None,
+        })
+    }
+
+    /// Debug function to attach to existing batch.
+    pub fn attach_to_batch(&self, batch_id: &str) -> DefaultBatch {
+        DefaultBatch {
+            batch_id: batch_id.to_string(),
+            commands: Arc::from(vec![]),
+            api: self.api.clone(),
+            activity_id: self.activity_id.clone(),
+        }
+    }
+
     pub async fn execute_commands(
         &self,
         commands: Vec<ExeScriptCommand>,
@@ -95,6 +120,51 @@ impl DefaultActivity {
             .try_collect()
             .await
     }
+
+    pub async fn get_state(&self) -> anyhow::Result<ActivityState> {
+        Ok(self
+            .api
+            .state()
+            .get_state(&self.activity_id)
+            .await
+            .map_err(|e| {
+                anyhow!(
+                    "Failed to get state for activity [{}]. {}",
+                    &self.activity_id,
+                    e
+                )
+            })?)
+    }
+
+    pub async fn get_running_command(&self) -> anyhow::Result<ExeScriptCommandState> {
+        Ok(self
+            .api
+            .state()
+            .get_running_command(&self.activity_id)
+            .await
+            .map_err(|e| {
+                anyhow!(
+                    "Failed to get running command for activity [{}]. {}",
+                    &self.activity_id,
+                    e
+                )
+            })?)
+    }
+
+    pub async fn get_usage(&self) -> anyhow::Result<ActivityUsage> {
+        Ok(self
+            .api
+            .state()
+            .get_usage(&self.activity_id)
+            .await
+            .map_err(|e| {
+                anyhow!(
+                    "Failed to get usage for activity [{}]. {}",
+                    &self.activity_id,
+                    e
+                )
+            })?)
+    }
 }
 
 impl Drop for DefaultActivity {
@@ -169,7 +239,7 @@ pub struct DefaultBatch {
     commands: Arc<[ExeScriptCommand]>,
 }
 
-fn generate_events<Generator, GResult>(
+pub(crate) fn generate_events<Generator, GResult>(
     generator: Generator,
     commands: Arc<[ExeScriptCommand]>,
 ) -> impl Stream<Item = Result<Event>>
@@ -258,132 +328,3 @@ impl RunningBatch for DefaultBatch {
         .boxed_local()
     }
 }
-
-pub struct SgxActivity {
-    secure_api: SecureActivityRequestorApi,
-    api: ActivityRequestorApi,
-    activity_id: String,
-    drop_list: CancelableDropList,
-}
-
-impl Drop for SgxActivity {
-    fn drop(&mut self) {
-        if let Some(ref drop_list) = self.drop_list.take() {
-            let api = self.api.clone();
-            let id = self.activity_id.clone();
-            drop_list.async_drop(async move {
-                api.control()
-                    .destroy_activity(&id)
-                    .await
-                    .with_context(|| format!("Failed to auto destroy Activity: {:?}", id))?;
-                log::debug!(target:"yarapi::drop", "Activity {:?} destroyed", id);
-                Ok(())
-            })
-        }
-    }
-}
-
-impl SgxActivity {
-    pub(crate) async fn create(
-        api: ActivityRequestorApi,
-        agreement_id: &str,
-        drop_list: CancelableDropList,
-    ) -> Result<Self> {
-        let secure_api = api
-            .control()
-            .create_secure_activity(agreement_id)
-            .await
-            .with_context(|| {
-                format!("failed to create activity for agreement {:?}", agreement_id)
-            })?;
-        let activity_id = secure_api.activity_id();
-
-        Ok(Self {
-            api,
-            secure_api,
-            activity_id,
-            drop_list,
-        })
-    }
-}
-
-impl Activity for SgxActivity {
-    type RunningBatch = SgxBatch;
-
-    fn id(&self) -> &str {
-        &self.activity_id
-    }
-
-    fn exec(
-        &self,
-        commands: Vec<ExeScriptCommand>,
-    ) -> LocalBoxFuture<'static, Result<Self::RunningBatch>> {
-        let api = self.secure_api.clone();
-        async move {
-            let batch_commands = commands.clone().into();
-            let batch_id = api.exec(commands).await?;
-            Ok(SgxBatch {
-                api,
-                batch_id,
-                commands: batch_commands,
-            })
-        }
-        .boxed_local()
-    }
-
-    fn credentials(&self) -> Option<Credentials> {
-        Some(self.secure_api.proof())
-    }
-
-    fn destroy(&self) -> LocalBoxFuture<'static, Result<()>> {
-        let api = self.api.clone();
-        let activity_id = self.activity_id.clone();
-        async move {
-            api.control()
-                .destroy_activity(&activity_id)
-                .await
-                .with_context(|| format!("failed to destroy sgx activity: {:?}", activity_id))
-        }
-        .boxed_local()
-    }
-}
-
-pub struct SgxBatch {
-    api: SecureActivityRequestorApi,
-    batch_id: String,
-    commands: Arc<[ExeScriptCommand]>,
-}
-
-impl RunningBatch for SgxBatch {
-    fn id(&self) -> &str {
-        &self.batch_id
-    }
-
-    fn commands(&self) -> Vec<ExeScriptCommand> {
-        self.commands.iter().cloned().collect()
-    }
-
-    fn events(&self) -> LocalBoxStream<'static, Result<Event>> {
-        let api = self.api.clone();
-        let batch_id: Arc<str> = self.batch_id.clone().into();
-
-        generate_events(
-            move |idx| {
-                let api = api.clone();
-                let batch_id = batch_id.clone();
-                async move {
-                    loop {
-                        match api.get_exec_batch_results(&batch_id, Some(10.0), idx).await {
-                            Ok(v) => return Ok(v),
-                            Err(ya_client::Error::TimeoutError { .. }) => (),
-                            Err(ya_client::Error::InternalError(ref msg)) if msg == "Timeout" => (),
-                            Err(e) => return Err(e.into()),
-                        }
-                    }
-                }
-            },
-            self.commands.clone(),
-        )
-        .boxed_local()
-    }
-}
diff --git a/src/rest/market.rs b/src/rest/market.rs
index e2da3b5..9af83e3 100644
--- a/src/rest/market.rs
+++ b/src/rest/market.rs
@@ -1,14 +1,17 @@
 use anyhow::{anyhow, bail, Context};
-use chrono::{DateTime, Utc};
+use chrono::{DateTime, TimeZone, Utc};
 use futures::prelude::*;
 use futures::TryStreamExt;
 use std::sync::Arc;
 use tokio::sync::mpsc;
 
 use crate::rest::async_drop::{CancelableDropList, DropList};
+use std::collections::HashSet;
+use std::fmt::Display;
 use ya_client::market::MarketRequestorApi;
-use ya_client::model::market::NewDemand;
-use ya_client::model::market::{AgreementProposal, RequestorEvent};
+use ya_client::model::market::{
+    AgreementEventType, AgreementOperationEvent, AgreementProposal, NewDemand, RequestorEvent,
+};
 use ya_client::model::NodeId;
 use ya_client::web::WebClient;
 
@@ -28,7 +31,7 @@ impl AsRef<str> for SubscriptionId {
 }
 
 pub struct Market {
-    api: MarketRequestorApi,
+    pub api: MarketRequestorApi,
     drop_list: DropList,
 }
 
@@ -70,6 +73,84 @@ impl Market {
     pub fn subscriptions(&self) -> impl Stream<Item = anyhow::Result<Subscription>> {
         stream::empty()
     }
+
+    /// Lists all Agreements for identity, that is currently used.
+    /// You can filter Agreements using AppSessionId parameter.
+    pub async fn list_agreements<Tz>(
+        &self,
+        since: &DateTime<Tz>,
+        app_session_id: Option<String>,
+    ) -> anyhow::Result<Vec<String>>
+    where
+        Tz: TimeZone,
+        Tz::Offset: Display,
+    {
+        Ok(self
+            .list_agreement_events(since, app_session_id)
+            .await?
+            .into_iter()
+            .filter_map(|event| match event.event_type {
+                AgreementEventType::AgreementApprovedEvent => Some(event.agreement_id),
+                _ => None,
+            })
+            .collect())
+    }
+
+    pub async fn list_active_agreements<Tz>(
+        &self,
+        since: &DateTime<Tz>,
+        app_session_id: Option<String>,
+    ) -> anyhow::Result<Vec<String>>
+    where
+        Tz: TimeZone,
+        Tz::Offset: Display,
+    {
+        let mut agreements = HashSet::new();
+        self.list_agreement_events(since, app_session_id)
+            .await?
+            .into_iter()
+            .for_each(|event| {
+                match event.event_type {
+                    AgreementEventType::AgreementApprovedEvent => {
+                        agreements.insert(event.agreement_id)
+                    }
+                    AgreementEventType::AgreementTerminatedEvent { .. } => {
+                        agreements.remove(&event.agreement_id)
+                    }
+                    _ => false,
+                };
+                ()
+            });
+
+        Ok(agreements.into_iter().collect())
+    }
+
+    pub async fn list_agreement_events<Tz>(
+        &self,
+        since: &DateTime<Tz>,
+        app_session_id: Option<String>,
+    ) -> anyhow::Result<Vec<AgreementOperationEvent>>
+    where
+        Tz: TimeZone,
+        Tz::Offset: Display,
+    {
+        let mut since = since.with_timezone(&Utc);
+        let mut events = vec![];
+
+        loop {
+            let new_events = self
+                .api
+                .collect_agreement_events(Some(0.0), Some(&since), Some(30), app_session_id.clone())
+                .await?;
+
+            if new_events.is_empty() {
+                return Ok(events);
+            }
+
+            since = new_events.last().unwrap().event_date;
+            events.extend(new_events);
+        }
+    }
 }
 
 #[derive(Clone)]
diff --git a/src/rest/sgx.rs b/src/rest/sgx.rs
new file mode 100644
index 0000000..404ce2e
--- /dev/null
+++ b/src/rest/sgx.rs
@@ -0,0 +1,143 @@
+use anyhow::{Context, Result};
+use futures::future::LocalBoxFuture;
+use futures::stream::LocalBoxStream;
+use futures::{FutureExt, StreamExt};
+use std::sync::Arc;
+
+use crate::rest::activity::{generate_events, Event};
+use crate::rest::async_drop::CancelableDropList;
+use crate::rest::{Activity, RunningBatch};
+
+use ya_client::activity::ActivityRequestorApi;
+pub use ya_client::activity::SecureActivityRequestorApi;
+pub use ya_client::model::activity::Credentials;
+pub use ya_client::model::activity::ExeScriptCommand;
+
+pub struct SgxActivity {
+    secure_api: SecureActivityRequestorApi,
+    api: ActivityRequestorApi,
+    activity_id: String,
+    drop_list: CancelableDropList,
+}
+
+impl Drop for SgxActivity {
+    fn drop(&mut self) {
+        if let Some(ref drop_list) = self.drop_list.take() {
+            let api = self.api.clone();
+            let id = self.activity_id.clone();
+            drop_list.async_drop(async move {
+                api.control()
+                    .destroy_activity(&id)
+                    .await
+                    .with_context(|| format!("Failed to auto destroy Activity: {:?}", id))?;
+                log::debug!(target:"yarapi::drop", "Activity {:?} destroyed", id);
+                Ok(())
+            })
+        }
+    }
+}
+
+impl SgxActivity {
+    pub(crate) async fn create(
+        api: ActivityRequestorApi,
+        agreement_id: &str,
+        drop_list: CancelableDropList,
+    ) -> Result<Self> {
+        let secure_api = api
+            .control()
+            .create_secure_activity(agreement_id)
+            .await
+            .with_context(|| {
+                format!("failed to create activity for agreement {:?}", agreement_id)
+            })?;
+        let activity_id = secure_api.activity_id();
+
+        Ok(Self {
+            api,
+            secure_api,
+            activity_id,
+            drop_list,
+        })
+    }
+}
+
+impl Activity for SgxActivity {
+    type RunningBatch = SgxBatch;
+
+    fn id(&self) -> &str {
+        &self.activity_id
+    }
+
+    fn exec(
+        &self,
+        commands: Vec<ExeScriptCommand>,
+    ) -> LocalBoxFuture<'static, Result<Self::RunningBatch>> {
+        let api = self.secure_api.clone();
+        async move {
+            let batch_commands = commands.clone().into();
+            let batch_id = api.exec(commands).await?;
+            Ok(SgxBatch {
+                api,
+                batch_id,
+                commands: batch_commands,
+            })
+        }
+        .boxed_local()
+    }
+
+    fn credentials(&self) -> Option<Credentials> {
+        Some(self.secure_api.proof())
+    }
+
+    fn destroy(&self) -> LocalBoxFuture<'static, Result<()>> {
+        let api = self.api.clone();
+        let activity_id = self.activity_id.clone();
+        async move {
+            api.control()
+                .destroy_activity(&activity_id)
+                .await
+                .with_context(|| format!("failed to destroy sgx activity: {:?}", activity_id))
+        }
+        .boxed_local()
+    }
+}
+
+pub struct SgxBatch {
+    api: SecureActivityRequestorApi,
+    batch_id: String,
+    commands: Arc<[ExeScriptCommand]>,
+}
+
+impl RunningBatch for SgxBatch {
+    fn id(&self) -> &str {
+        &self.batch_id
+    }
+
+    fn commands(&self) -> Vec<ExeScriptCommand> {
+        self.commands.iter().cloned().collect()
+    }
+
+    fn events(&self) -> LocalBoxStream<'static, Result<Event>> {
+        let api = self.api.clone();
+        let batch_id: Arc<str> = self.batch_id.clone().into();
+
+        generate_events(
+            move |idx| {
+                let api = api.clone();
+                let batch_id = batch_id.clone();
+                async move {
+                    loop {
+                        match api.get_exec_batch_results(&batch_id, Some(10.0), idx).await {
+                            Ok(v) => return Ok(v),
+                            Err(ya_client::Error::TimeoutError { .. }) => (),
+                            Err(ya_client::Error::InternalError(ref msg)) if msg == "Timeout" => (),
+                            Err(e) => return Err(e.into()),
+                        }
+                    }
+                }
+            },
+            self.commands.clone(),
+        )
+        .boxed_local()
+    }
+}
diff --git a/src/rest/streaming.rs b/src/rest/streaming.rs
index 3fbdb39..b110842 100644
--- a/src/rest/streaming.rs
+++ b/src/rest/streaming.rs
@@ -1,5 +1,4 @@
 mod batch;
-mod capture_messages;
 mod forward_to_file;
 mod forward_to_std;
 mod messaging;
diff --git a/src/rest/streaming/batch.rs b/src/rest/streaming/batch.rs
index 3e9da8a..573ae0e 100644
--- a/src/rest/streaming/batch.rs
+++ b/src/rest/streaming/batch.rs
@@ -1,9 +1,10 @@
 use anyhow::{anyhow, Result};
 use futures::prelude::*;
 use futures::FutureExt;
+use std::io::Write;
 use std::sync::Arc;
 
-use crate::rest::activity::DefaultActivity;
+use crate::rest::activity::{DefaultActivity, DefaultBatch};
 use crate::rest::{Activity, RunningBatch};
 
 use ya_client::activity::ActivityRequestorApi;
@@ -71,6 +72,21 @@ impl StreamingBatch {
             }
         }
     }
+
+    pub fn debug(self, filename: &str) -> anyhow::Result<Self> {
+        let debug_content = format!(
+            "ACTIVITY_ID={}\n\
+             BATCH_ID={}\n",
+            &self.activity_id, &self.batch_id
+        );
+
+        std::fs::File::create(filename)
+            .map_err(|e| anyhow!("Failed to create debug file {}. {}", filename, e))?
+            .write_all(debug_content.as_bytes())
+            .map_err(|e| anyhow!("Failed to write to debug file {}. {}", filename, e))?;
+
+        Ok(self)
+    }
 }
 
 impl StreamingActivity for DefaultActivity {
@@ -79,15 +95,7 @@ impl StreamingActivity for DefaultActivity {
         commands: Vec<ExeScriptCommand>,
     ) -> future::LocalBoxFuture<'static, Result<StreamingBatch>> {
         let batch_fut = self.exec(commands);
-        async move {
-            batch_fut.await.map(|batch| StreamingBatch {
-                batch_id: batch.id().to_string(),
-                commands: Arc::from(batch.commands()),
-                api: batch.api,
-                activity_id: batch.activity_id,
-            })
-        }
-        .boxed_local()
+        async move { batch_fut.await.map(|batch| StreamingBatch::from(batch)) }.boxed_local()
     }
 
     fn run_streaming(
@@ -112,3 +120,14 @@ impl StreamingActivity for DefaultActivity {
         self.exec_streaming(commands)
     }
 }
+
+impl From<DefaultBatch> for StreamingBatch {
+    fn from(batch: DefaultBatch) -> Self {
+        StreamingBatch {
+            batch_id: batch.id().to_string(),
+            commands: Arc::from(batch.commands()),
+            api: batch.api,
+            activity_id: batch.activity_id,
+        }
+    }
+}
diff --git a/src/rest/streaming/messaging.rs b/src/rest/streaming/messaging.rs
index 6c4764e..6fa49d4 100644
--- a/src/rest/streaming/messaging.rs
+++ b/src/rest/streaming/messaging.rs
@@ -1,25 +1,9 @@
+pub mod capture;
+mod exeunit;
+
 use serde::de::DeserializeOwned;
 use serde::Serialize;
-use std::io::{self, Write};
-
-pub trait ExeUnitMessage: Serialize + DeserializeOwned + Send + Sync {}
-
-pub fn encode_message(msg: &impl ExeUnitMessage) -> anyhow::Result<Vec<u8>> {
-    let mut data = serde_json::to_vec(msg)?;
 
-    // Add control characters
-    data.insert(0, 0x02 as u8);
-    data.push(0x03 as u8);
+pub use exeunit::{encode_message, send_to_guest};
 
-    Ok(data)
-}
-
-pub fn send_to_guest(msg: &impl ExeUnitMessage) -> anyhow::Result<()> {
-    let data = encode_message(msg)?;
-
-    // Write atomically to stdout.
-    let mut stdout = io::stdout();
-    //let mut stdout = stdout.lock();
-    stdout.write(data.as_ref())?;
-    Ok(())
-}
+pub trait ExeUnitMessage: Serialize + DeserializeOwned + Send + Sync {}
diff --git a/src/rest/streaming/capture_messages.rs b/src/rest/streaming/messaging/capture.rs
similarity index 99%
rename from src/rest/streaming/capture_messages.rs
rename to src/rest/streaming/messaging/capture.rs
index d4dca3b..bc0f66f 100644
--- a/src/rest/streaming/capture_messages.rs
+++ b/src/rest/streaming/messaging/capture.rs
@@ -9,7 +9,7 @@ use tokio::sync::mpsc;
 
 use ya_client::model::activity::{CommandOutput, RuntimeEvent, RuntimeEventKind};
 
-use super::messaging::ExeUnitMessage;
+use super::ExeUnitMessage;
 
 struct MessageProcessor<MessageType: ExeUnitMessage> {
     notifier: mpsc::UnboundedSender<MessageType>,
diff --git a/src/rest/streaming/messaging/exeunit.rs b/src/rest/streaming/messaging/exeunit.rs
new file mode 100644
index 0000000..71ef574
--- /dev/null
+++ b/src/rest/streaming/messaging/exeunit.rs
@@ -0,0 +1,23 @@
+use std::io::{self, Write};
+
+use super::ExeUnitMessage;
+
+pub fn encode_message(msg: &impl ExeUnitMessage) -> anyhow::Result<Vec<u8>> {
+    let mut data = serde_json::to_vec(msg)?;
+
+    // Add control characters
+    data.insert(0, 0x02 as u8);
+    data.push(0x03 as u8);
+
+    Ok(data)
+}
+
+pub fn send_to_guest(msg: &impl ExeUnitMessage) -> anyhow::Result<()> {
+    let data = encode_message(msg)?;
+
+    // Write atomically to stdout.
+    let mut stdout = io::stdout();
+    //let mut stdout = stdout.lock();
+    stdout.write(data.as_ref())?;
+    Ok(())
+}
diff --git a/src/rest/streaming/result_stream.rs b/src/rest/streaming/result_stream.rs
index 6f39fd1..33a8efe 100644
--- a/src/rest/streaming/result_stream.rs
+++ b/src/rest/streaming/result_stream.rs
@@ -2,9 +2,9 @@ use futures::prelude::*;
 use std::path::Path;
 use tokio::sync::mpsc;
 
-use super::capture_messages::CaptureMessages;
 use super::forward_to_file::ForwardToFile;
 use super::forward_to_std::ForwardStd;
+use super::messaging::capture::CaptureMessages;
 use super::messaging::ExeUnitMessage;
 
 use ya_client::model::activity::RuntimeEvent;
@@ -27,6 +27,8 @@ pub trait ResultStream: Stream {
         ForwardToFile::new(self, stdout, stderr)
     }
 
+    /// Uses passed channel to notify about messages discovered in stream.
+    /// Recognized messages are removed from stream.
     fn capture_messages<MessageType: ExeUnitMessage>(
         self,
         notifier: mpsc::UnboundedSender<MessageType>,
diff --git a/src/rest/transfer.rs b/src/rest/transfer.rs
new file mode 100644
index 0000000..2de13ec
--- /dev/null
+++ b/src/rest/transfer.rs
@@ -0,0 +1,205 @@
+use anyhow::*;
+use futures::prelude::*;
+use futures::TryStreamExt;
+use serde::de::DeserializeOwned;
+use serde::Serialize;
+use std::io::BufReader;
+use std::path::Path;
+use url::Url;
+
+use crate::rest::activity::Event;
+use crate::rest::{Activity, ExeScriptCommand, RunningBatch};
+
+#[derive(thiserror::Error, Debug)]
+pub enum FileTransferError {
+    #[error(transparent)]
+    Transfer(#[from] TransferCmdError),
+    #[error("[{path}] is invalid URL. {e}")]
+    BadUrl { path: String, e: String },
+    #[error("Gftp error transferring from [{src}] to [{dest}]: {e}")]
+    Gftp {
+        src: String,
+        dest: String,
+        e: String,
+    },
+}
+
+#[derive(thiserror::Error, Debug)]
+pub enum TransferCmdError {
+    #[error("Error transferring file from [{src}] to [{dest}]. Error: {e}")]
+    CommandError {
+        src: String,
+        dest: String,
+        e: String,
+    },
+}
+
+#[derive(thiserror::Error, Debug)]
+pub enum JsonTransferError {
+    #[error("Error sending json. {0}")]
+    Transfer(#[from] FileTransferError),
+    #[error("Failed to serialize object to temp file. {0}")]
+    Serialization(String),
+    #[error("Failed to deserialize object from temp file. {0}")]
+    Deserialization(String),
+    #[error("Error sending json. {0}")]
+    Internal(#[from] TransferInternalError),
+}
+
+#[derive(thiserror::Error, Debug)]
+pub enum TransferInternalError {
+    #[error("Failed to create temporary file. {0}")]
+    CreatingTemporary(String),
+    #[error("Can't persist temporary file. {0}")]
+    PersistTemporary(String),
+}
+
+pub trait Transfers: Activity {
+    fn send_file<'a>(
+        &'a self,
+        src: &Path,
+        dest: &Path,
+    ) -> future::LocalBoxFuture<'a, Result<(), FileTransferError>> {
+        let src = src.to_path_buf();
+        let dest = format!("container:{}", dest.display());
+
+        async move {
+            let dest = Url::parse(&dest).map_err(|e| FileTransferError::BadUrl {
+                path: dest.clone(),
+                e: e.to_string(),
+            })?;
+
+            let src = gftp::publish(&src)
+                .await
+                .map_err(|e| FileTransferError::Gftp {
+                    src: src.to_string_lossy().to_string(),
+                    dest: dest.to_string(),
+                    e: e.to_string(),
+                })?;
+
+            self.transfer(&src, &dest)
+                .await
+                .map_err(FileTransferError::from)
+        }
+        .boxed_local()
+    }
+
+    fn send_json<'a, T: Serialize>(
+        &'a self,
+        dest: &Path,
+        to_serialize: &'a T,
+    ) -> future::LocalBoxFuture<'a, Result<(), JsonTransferError>> {
+        let dest = dest.to_path_buf();
+        async move {
+            let (file, file_path) = tempfile::NamedTempFile::new()
+                .map_err(|e| TransferInternalError::CreatingTemporary(e.to_string()))?
+                .keep()
+                .map_err(|e| TransferInternalError::PersistTemporary(e.to_string()))?;
+
+            serde_json::to_writer(file, to_serialize)
+                .map_err(|e| JsonTransferError::Serialization(e.to_string()))?;
+
+            Ok(self.send_file(&file_path, &dest).await?)
+        }
+        .boxed_local()
+    }
+
+    fn download_file<'a>(
+        &'a self,
+        src: &Path,
+        dest: &Path,
+    ) -> future::LocalBoxFuture<'a, Result<(), FileTransferError>> {
+        let dest = dest.to_path_buf();
+        let src = format!("container:{}", src.display());
+
+        async move {
+            let src = Url::parse(&src).map_err(|e| FileTransferError::BadUrl {
+                path: src.to_string(),
+                e: e.to_string(),
+            })?;
+
+            let dest = gftp::open_for_upload(&dest)
+                .await
+                .map_err(|e| FileTransferError::Gftp {
+                    src: src.to_string(),
+                    dest: dest.to_string_lossy().to_string(),
+                    e: e.to_string(),
+                })?;
+
+            Ok(self.transfer(&src, &dest).await?)
+        }
+        .boxed_local()
+    }
+
+    fn download_json<T: DeserializeOwned>(
+        &self,
+        src: &Path,
+    ) -> future::LocalBoxFuture<Result<T, JsonTransferError>> {
+        let src = src.to_path_buf();
+        async move {
+            let (file, file_path) = tempfile::NamedTempFile::new()
+                .map_err(|e| TransferInternalError::CreatingTemporary(e.to_string()))?
+                .keep()
+                .map_err(|e| TransferInternalError::PersistTemporary(e.to_string()))?;
+
+            self.download_file(&src, &file_path).await?;
+
+            let reader = BufReader::new(file);
+            serde_json::from_reader(reader)
+                .map_err(|e| JsonTransferError::Deserialization(e.to_string()))
+        }
+        .boxed_local()
+    }
+
+    fn transfer<'a>(
+        &'a self,
+        src: &Url,
+        dest: &Url,
+    ) -> future::LocalBoxFuture<'a, Result<(), TransferCmdError>> {
+        let src = src.to_string();
+        let dest = dest.to_string();
+
+        async move {
+            let commands = vec![ExeScriptCommand::Transfer {
+                from: src.clone(),
+                to: dest.clone(),
+                args: Default::default(),
+            }];
+
+            if let Err(e) = self.execute_commands(commands).await {
+                let error = TransferCmdError::CommandError {
+                    src: src.clone(),
+                    dest: dest.clone(),
+                    e: e.to_string(),
+                };
+                log::error!("{}", &error);
+                return Err(error);
+            }
+            Ok(())
+        }
+        .boxed_local()
+    }
+
+    fn execute_commands(
+        &self,
+        commands: Vec<ExeScriptCommand>,
+    ) -> future::LocalBoxFuture<anyhow::Result<Vec<String>>> {
+        let batch = self.exec(commands);
+        async move {
+            batch
+                .await?
+                .events()
+                .and_then(|event| match event {
+                    Event::StepFailed { message } => {
+                        future::err::<String, anyhow::Error>(anyhow!("Step failed: {}", message))
+                    }
+                    Event::StepSuccess { output, .. } => future::ok(output),
+                })
+                .try_collect()
+                .await
+        }
+        .boxed_local()
+    }
+}
+
+impl<T> Transfers for T where T: Activity {}