7 Commits

Author SHA1 Message Date
Sashanoraa
849f7807a9 Track individual sessions (local and remote id) for each operation
This allows multiple operations to be performed simultaneously
2025-06-26 03:29:22 -04:00
cocool97
39a7f0a8cf chore: bump criterion + pyo3 (#122) 2025-05-24 14:56:34 +02:00
LIAUD Corentin
4129d9d218 chore: v2.1.13 2025-05-12 19:48:19 +02:00
alesharik
c23dca61d7 feat: add fastboot reboot type (#119)
* feat: add fastboot reboot type

* feat: add fastboot command to cli

---------

Co-authored-by: LIAUD Corentin <corentinliaud26@gmail.com>
2025-05-12 19:47:56 +02:00
LIAUD Corentin
2bc338fdf5 fix: add missing chrono "std" feature 2025-05-11 14:45:50 +02:00
wxitcode
728fb7da95 fix: device long parse error issue (#118)
* fix: device long parse error issue

* test: add device_long unit tests

* fix: prevent copy when parsing DeviceLong

---------

Co-authored-by: LIAUD Corentin <corentinliaud26@gmail.com>
2025-05-11 14:02:19 +02:00
LIAUD Corentin
2e762400e5 fix: reduce dependencies (#112)
- Reduce tree from 349 to 210.
- Remove unused lazy_static dependency
2025-05-09 19:37:25 +02:00
16 changed files with 134 additions and 208 deletions

View File

@@ -9,7 +9,7 @@ homepage = "https://github.com/cocool97/adb_client"
keywords = ["adb", "android", "tcp", "usb"]
license = "MIT"
repository = "https://github.com/cocool97/adb_client"
version = "2.1.12"
version = "2.1.13"
# To build locally when working on a new release
[patch.crates-io]

View File

@@ -8,6 +8,7 @@ pub enum RebootTypeCommand {
Recovery,
Sideload,
SideloadAutoReboot,
Fastboot,
}
impl From<RebootTypeCommand> for RebootType {
@@ -18,6 +19,7 @@ impl From<RebootTypeCommand> for RebootType {
RebootTypeCommand::Recovery => RebootType::Recovery,
RebootTypeCommand::Sideload => RebootType::Sideload,
RebootTypeCommand::SideloadAutoReboot => RebootType::SideloadAutoReboot,
RebootTypeCommand::Fastboot => RebootType::Fastboot,
}
}
}

View File

@@ -13,22 +13,26 @@ version.workspace = true
base64 = { version = "0.22.1" }
bincode = { version = "1.3.3" }
byteorder = { version = "1.5.0" }
chrono = { version = "0.4.40" }
chrono = { version = "0.4.40", default-features = false, features = ["std"] }
homedir = { version = "0.3.4" }
image = { version = "0.25.5" }
lazy_static = { version = "1.5.0" }
image = { version = "0.25.5", default-features = false }
log = { version = "0.4.26" }
mdns-sd = { version = "0.13.2" }
mdns-sd = { version = "0.13.9", default-features = false, features = [
"logging",
] }
num-bigint = { version = "0.8.4", package = "num-bigint-dig" }
num-traits = { version = "0.2.19" }
quick-protobuf = { version = "0.8.1" }
rand = { version = "0.9.0" }
rcgen = { version = "0.13.1" }
rcgen = { version = "0.13.1", default-features = false, features = [
"aws_lc_rs",
"pem",
] }
regex = { version = "1.11.1", features = ["perf", "std", "unicode"] }
rsa = { version = "0.9.7" }
rusb = { version = "0.9.4", features = ["vendored"] }
rustls = { version = "0.23.22" }
rustls-pki-types = "1.11.0"
rustls = { version = "0.23.27" }
rustls-pki-types = { version = "1.11.0" }
serde = { version = "1.0.216", features = ["derive"] }
serde_repr = { version = "0.1.19" }
sha1 = { version = "0.10.6", features = ["oid"] }
@@ -36,7 +40,7 @@ thiserror = { version = "2.0.7" }
[dev-dependencies]
anyhow = { version = "1.0.93" }
criterion = { version = "0.5.1" } # Used for benchmarks
criterion = { version = "0.6.0" } # Used for benchmarks
[[bench]]
harness = false

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@@ -11,18 +11,18 @@ use super::{ADBTransportMessage, MessageCommand, models::MessageSubcommand};
#[derive(Debug)]
pub struct ADBMessageDevice<T: ADBMessageTransport> {
transport: T,
local_id: Option<u32>,
remote_id: Option<u32>,
}
#[derive(Debug, Clone, Copy)]
pub struct ADBSession {
pub local_id: u32,
pub remote_id: u32,
}
impl<T: ADBMessageTransport> ADBMessageDevice<T> {
/// Instantiate a new [`ADBMessageTransport`]
pub fn new(transport: T) -> Self {
Self {
transport,
local_id: None,
remote_id: None,
}
Self { transport }
}
pub(crate) fn get_transport(&mut self) -> &T {
@@ -34,12 +34,15 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
}
/// Receive a message and acknowledge it by replying with an `OKAY` command
pub(crate) fn recv_and_reply_okay(&mut self) -> Result<ADBTransportMessage> {
pub(crate) fn recv_and_reply_okay(
&mut self,
session: ADBSession,
) -> Result<ADBTransportMessage> {
let message = self.transport.read_message()?;
self.transport.write_message(ADBTransportMessage::new(
MessageCommand::Okay,
self.get_local_id()?,
self.get_remote_id()?,
session.local_id,
session.remote_id,
&[],
))?;
Ok(message)
@@ -60,11 +63,12 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
pub(crate) fn recv_file<W: std::io::Write>(
&mut self,
session: ADBSession,
mut output: W,
) -> std::result::Result<(), RustADBError> {
let mut len: Option<u64> = None;
loop {
let payload = self.recv_and_reply_okay()?.into_payload();
let payload = self.recv_and_reply_okay(session)?.into_payload();
let mut rdr = Cursor::new(&payload);
while rdr.position() != payload.len() as u64 {
match len.take() {
@@ -97,8 +101,7 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
pub(crate) fn push_file<R: std::io::Read>(
&mut self,
local_id: u32,
remote_id: u32,
session: ADBSession,
mut reader: R,
) -> std::result::Result<(), RustADBError> {
let mut buffer = [0; BUFFER_SIZE];
@@ -111,8 +114,8 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
let message = ADBTransportMessage::new(
MessageCommand::Write,
local_id,
remote_id,
session.local_id,
session.remote_id,
&serialized_message,
);
@@ -131,8 +134,8 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
let message = ADBTransportMessage::new(
MessageCommand::Write,
local_id,
remote_id,
session.local_id,
session.remote_id,
&serialized_message,
);
@@ -159,8 +162,8 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
let message = ADBTransportMessage::new(
MessageCommand::Write,
local_id,
remote_id,
session.local_id,
session.remote_id,
&serialized_message,
);
@@ -173,24 +176,27 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
}
}
pub(crate) fn begin_synchronization(&mut self) -> Result<()> {
self.open_session(b"sync:\0")?;
Ok(())
pub(crate) fn begin_synchronization(&mut self) -> Result<ADBSession> {
self.open_session(b"sync:\0")
}
pub(crate) fn stat_with_explicit_ids(&mut self, remote_path: &str) -> Result<AdbStatResponse> {
pub(crate) fn stat_with_explicit_ids(
&mut self,
session: ADBSession,
remote_path: &str,
) -> Result<AdbStatResponse> {
let stat_buffer = MessageSubcommand::Stat.with_arg(remote_path.len() as u32);
let message = ADBTransportMessage::new(
MessageCommand::Write,
self.get_local_id()?,
self.get_remote_id()?,
session.local_id,
session.remote_id,
&bincode::serialize(&stat_buffer).map_err(|_e| RustADBError::ConversionError)?,
);
self.send_and_expect_okay(message)?;
self.send_and_expect_okay(ADBTransportMessage::new(
MessageCommand::Write,
self.get_local_id()?,
self.get_remote_id()?,
session.local_id,
session.remote_id,
remote_path.as_bytes(),
))?;
let response = self.transport.read_message()?;
@@ -200,24 +206,25 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
.map_err(|_e| RustADBError::ConversionError)
}
pub(crate) fn end_transaction(&mut self) -> Result<()> {
pub(crate) fn end_transaction(&mut self, session: ADBSession) -> Result<()> {
let quit_buffer = MessageSubcommand::Quit.with_arg(0u32);
self.send_and_expect_okay(ADBTransportMessage::new(
MessageCommand::Write,
self.get_local_id()?,
self.get_remote_id()?,
session.local_id,
session.remote_id,
&bincode::serialize(&quit_buffer).map_err(|_e| RustADBError::ConversionError)?,
))?;
let _discard_close = self.transport.read_message()?;
Ok(())
}
pub(crate) fn open_session(&mut self, data: &[u8]) -> Result<ADBTransportMessage> {
pub(crate) fn open_session(&mut self, data: &[u8]) -> Result<ADBSession> {
let mut rng = rand::rng();
let local_id: u32 = rng.random();
let message = ADBTransportMessage::new(
MessageCommand::Open,
rng.random(), // Our 'local-id'
local_id, // Our 'local-id'
0,
data,
);
@@ -225,21 +232,25 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
let response = self.get_transport_mut().read_message()?;
self.local_id = Some(response.header().arg1());
self.remote_id = Some(response.header().arg0());
if response.header().command() != MessageCommand::Okay {
return Err(RustADBError::ADBRequestFailed(format!(
"Open session failed: got {} in respone instead of OKAY",
response.header().command()
)));
}
Ok(response)
}
if response.header().arg1() != local_id {
return Err(RustADBError::ADBRequestFailed(format!(
"Open session failed: respones used {} for our local_id instead of {local_id}",
response.header().arg1()
)));
}
pub(crate) fn get_local_id(&self) -> Result<u32> {
self.local_id.ok_or(RustADBError::ADBRequestFailed(
"connection not opened, no local_id".into(),
))
}
let session = ADBSession {
local_id,
remote_id: response.header().arg0(),
};
pub(crate) fn get_remote_id(&self) -> Result<u32> {
self.remote_id.ok_or(RustADBError::ADBRequestFailed(
"connection not opened, no remote_id".into(),
))
Ok(session)
}
}

View File

@@ -11,9 +11,9 @@ use crate::{
impl<T: ADBMessageTransport> ADBMessageDevice<T> {
pub(crate) fn framebuffer_inner(&mut self) -> Result<ImageBuffer<Rgba<u8>, Vec<u8>>> {
self.open_session(b"framebuffer:\0")?;
let session = self.open_session(b"framebuffer:\0")?;
let response = self.recv_and_reply_okay()?;
let response = self.recv_and_reply_okay(session)?;
let mut payload_cursor = Cursor::new(response.payload());
@@ -36,7 +36,7 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
break;
}
let response = self.recv_and_reply_okay()?;
let response = self.recv_and_reply_okay(session)?;
framebuffer_data.extend_from_slice(&response.into_payload());
@@ -69,7 +69,7 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
break;
}
let response = self.recv_and_reply_okay()?;
let response = self.recv_and_reply_okay(session)?;
framebuffer_data.extend_from_slice(&response.into_payload());

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@@ -2,7 +2,7 @@ use std::{fs::File, path::Path};
use crate::{
ADBMessageTransport, Result,
device::{MessageCommand, MessageWriter, adb_message_device::ADBMessageDevice},
device::{MessageWriter, adb_message_device::ADBMessageDevice},
utils::check_extension_is_apk,
};
@@ -14,11 +14,12 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
let file_size = apk_file.metadata()?.len();
self.open_session(format!("exec:cmd package 'install' -S {}\0", file_size).as_bytes())?;
let session =
self.open_session(format!("exec:cmd package 'install' -S {}\0", file_size).as_bytes())?;
let transport = self.get_transport().clone();
let mut writer = MessageWriter::new(transport, self.get_local_id()?, self.get_remote_id()?);
let mut writer = MessageWriter::new(transport, session.local_id, session.remote_id);
std::io::copy(&mut apk_file, &mut writer)?;
@@ -30,9 +31,6 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
"APK file {} successfully installed",
apk_path.as_ref().display()
);
self.get_transport_mut()
.read_message()?
.assert_command(MessageCommand::Clse)?;
Ok(())
}
d => Err(crate::RustADBError::ADBRequestFailed(String::from_utf8(

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@@ -10,10 +10,10 @@ use crate::{
impl<T: ADBMessageTransport> ADBMessageDevice<T> {
pub(crate) fn pull<A: AsRef<str>, W: Write>(&mut self, source: A, output: W) -> Result<()> {
self.begin_synchronization()?;
let session = self.begin_synchronization()?;
let source = source.as_ref();
let adb_stat_response = self.stat_with_explicit_ids(source)?;
let adb_stat_response = self.stat_with_explicit_ids(session, source)?;
if adb_stat_response.file_perm == 0 {
return Err(RustADBError::UnknownResponseType(
@@ -21,11 +21,13 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
));
}
let local_id = self.get_local_id()?;
let remote_id = self.get_remote_id()?;
self.get_transport_mut().write_message_with_timeout(
ADBTransportMessage::new(MessageCommand::Okay, local_id, remote_id, &[]),
ADBTransportMessage::new(
MessageCommand::Okay,
session.local_id,
session.remote_id,
&[],
),
std::time::Duration::from_secs(4),
)?;
@@ -34,19 +36,19 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
bincode::serialize(&recv_buffer).map_err(|_e| RustADBError::ConversionError)?;
self.send_and_expect_okay(ADBTransportMessage::new(
MessageCommand::Write,
self.get_local_id()?,
self.get_remote_id()?,
session.local_id,
session.remote_id,
&recv_buffer,
))?;
self.send_and_expect_okay(ADBTransportMessage::new(
MessageCommand::Write,
self.get_local_id()?,
self.get_remote_id()?,
session.local_id,
session.remote_id,
source.as_bytes(),
))?;
self.recv_file(output)?;
self.end_transaction()?;
self.recv_file(session, output)?;
self.end_transaction(session)?;
Ok(())
}
}

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@@ -10,7 +10,7 @@ use crate::{
impl<T: ADBMessageTransport> ADBMessageDevice<T> {
pub(crate) fn push<R: Read, A: AsRef<str>>(&mut self, stream: R, path: A) -> Result<()> {
self.begin_synchronization()?;
let session = self.begin_synchronization()?;
let path_header = format!("{},0777", path.as_ref());
@@ -21,14 +21,13 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
self.send_and_expect_okay(ADBTransportMessage::new(
MessageCommand::Write,
self.get_local_id()?,
self.get_remote_id()?,
session.local_id,
session.remote_id,
&send_buffer,
))?;
self.push_file(self.get_local_id()?, self.get_remote_id()?, stream)?;
self.end_transaction()?;
self.push_file(session, stream)?;
self.end_transaction(session)?;
Ok(())
}

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@@ -10,14 +10,7 @@ use crate::{
impl<T: ADBMessageTransport> ADBMessageDevice<T> {
/// Runs 'command' in a shell on the device, and write its output and error streams into output.
pub(crate) fn shell_command(&mut self, command: &[&str], output: &mut dyn Write) -> Result<()> {
let response = self.open_session(format!("shell:{}\0", command.join(" "),).as_bytes())?;
if response.header().command() != MessageCommand::Okay {
return Err(RustADBError::ADBRequestFailed(format!(
"wrong command {}",
response.header().command()
)));
}
let session = self.open_session(format!("shell:{}\0", command.join(" "),).as_bytes())?;
loop {
let response = self.get_transport_mut().read_message()?;
@@ -38,21 +31,22 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
mut reader: &mut dyn Read,
mut writer: Box<(dyn Write + Send)>,
) -> Result<()> {
self.open_session(b"shell:\0")?;
let session = self.open_session(b"shell:\0")?;
let mut transport = self.get_transport().clone();
let local_id = self.get_local_id()?;
let remote_id = self.get_remote_id()?;
// Reading thread, reads response from adbd
std::thread::spawn(move || -> Result<()> {
loop {
let message = transport.read_message()?;
// Acknowledge for more data
let response =
ADBTransportMessage::new(MessageCommand::Okay, local_id, remote_id, &[]);
let response = ADBTransportMessage::new(
MessageCommand::Okay,
session.local_id,
session.remote_id,
&[],
);
transport.write_message(response)?;
match message.header().command() {
@@ -67,7 +61,8 @@ impl<T: ADBMessageTransport> ADBMessageDevice<T> {
});
let transport = self.get_transport().clone();
let mut shell_writer = ShellMessageWriter::new(transport, local_id, remote_id);
let mut shell_writer =
ShellMessageWriter::new(transport, session.local_id, session.remote_id);
// Read from given reader (that could be stdin e.g), and write content to device adbd
if let Err(e) = std::io::copy(&mut reader, &mut shell_writer) {

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@@ -4,9 +4,9 @@ use crate::{
impl<T: ADBMessageTransport> ADBMessageDevice<T> {
pub(crate) fn stat(&mut self, remote_path: &str) -> Result<AdbStatResponse> {
self.begin_synchronization()?;
let adb_stat_response = self.stat_with_explicit_ids(remote_path)?;
self.end_transaction()?;
let session = self.begin_synchronization()?;
let adb_stat_response = self.stat_with_explicit_ids(session, remote_path)?;
self.end_transaction(session)?;
Ok(adb_stat_response)
}
}

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@@ -13,6 +13,8 @@ pub enum RebootType {
Sideload,
/// Same as `Sideload` but reboots after sideloading
SideloadAutoReboot,
/// Reboots to fastboot
Fastboot,
}
impl Display for RebootType {
@@ -23,6 +25,7 @@ impl Display for RebootType {
RebootType::Recovery => write!(f, "recovery"),
RebootType::Sideload => write!(f, "sideload"),
RebootType::SideloadAutoReboot => write!(f, "sideload-auto-reboot"),
RebootType::Fastboot => write!(f, "fastboot"),
}
}
}

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@@ -36,7 +36,7 @@ impl ADBServer {
break;
}
vec_devices.push(DeviceLong::try_from(device.to_vec())?);
vec_devices.push(DeviceLong::try_from(device)?);
}
Ok(vec_devices)

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@@ -6,7 +6,7 @@ use crate::{DeviceState, RustADBError};
use regex::bytes::Regex;
static DEVICES_LONG_REGEX: LazyLock<Regex> = LazyLock::new(|| {
Regex::new(r"^(?P<identifier>\S+)\s+(?P<state>\w+)\s+(usb:(?P<usb1>\S+)|(?P<usb2>\S+))?\s*(product:(?P<product>\w+)\s+model:(?P<model>\w+)\s+device:(?P<device>\w+)\s+)?transport_id:(?P<transport_id>\d+)$").expect("cannot build devices long regex")
Regex::new(r"^(?P<identifier>\S+)\s+(?P<state>\w+)\s+(usb:(?P<usb1>\S+)|(?P<usb2>\S+))?\s*(product:(?P<product>\S+)\s+model:(?P<model>\w+)\s+device:(?P<device>\S+)\s+)?transport_id:(?P<transport_id>\d+)$").expect("cannot build devices long regex")
});
/// Represents a new device with more informations.
@@ -44,12 +44,12 @@ impl Display for DeviceLong {
}
}
impl TryFrom<Vec<u8>> for DeviceLong {
impl TryFrom<&[u8]> for DeviceLong {
type Error = RustADBError;
fn try_from(value: Vec<u8>) -> Result<Self, Self::Error> {
fn try_from(value: &[u8]) -> Result<Self, Self::Error> {
let groups = DEVICES_LONG_REGEX
.captures(&value)
.captures(value)
.ok_or(RustADBError::RegexParsingError)?;
Ok(DeviceLong {
@@ -98,3 +98,17 @@ impl TryFrom<Vec<u8>> for DeviceLong {
})
}
}
#[test]
fn test_static_devices_long() {
let inputs = [
"7a5158f05122195aa device 1-5 product:gts210vewifixx model:SM_T813 device:gts210vewifi transport_id:4",
"n311r05e device usb:0-1.5 product:alioth model:M2012K11AC device:alioth transport_id:58",
"192.168.100.192:5555 device product:alioth model:M2012K11AC device:alioth transport_id:97",
"emulator-5554 device product:sdk_gphone64_arm64 model:sdk_gphone64_arm64 device:emu64a transport_id:101",
"QQ20131020250511 device 20-4 product:NOH-AN00 model:NOH_AN00 device:HWNOH transport_id:3",
];
for input in inputs {
DeviceLong::try_from(input.as_bytes()).expect(&format!("cannot parse input: '{input}'"));
}
}

View File

@@ -21,6 +21,6 @@ name = "stub_gen"
[dependencies]
adb_client = { path = "../adb_client" }
anyhow = { version = "1.0.95" }
pyo3 = { version = "0.24.1", features = ["abi3-py37", "anyhow"] }
pyo3 = { version = "0.25.0", features = ["abi3-py37", "anyhow"] }
pyo3-stub-gen = "0.7.0"
pyo3-stub-gen-derive = "0.7.0"

View File

@@ -47,7 +47,6 @@ usb_device.push("file.txt", "/data/local/tmp/file.txt")
```bash
# Create Python virtual environment
cd pyadb_client
python3 -m venv .venv
source .venv/bin/activate

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@@ -1,101 +0,0 @@
#[cfg(test)]
mod tests {
use std::io::Cursor;
use adb_client::{ADBServer, ADBServerDevice, DeviceLong};
use rand::Rng;
fn new_client() -> ADBServer {
ADBServer::default()
}
fn new_device() -> ADBServerDevice {
let mut client = new_client();
return client.get_device().expect("cannot get device");
}
#[test]
fn test_version() {
let mut adb = new_client();
adb.version().expect("cannot get adb version");
}
#[test]
fn test_shell_commands() {
let mut device = new_device();
device.shell_command(["ls"]).expect("error while executing `ls` command");
device.shell_command(["pwd"]).expect("error while executing `pwd` command");
}
#[test]
fn test_devices() {
let mut adb = new_client();
adb.devices().expect("cannot list devices");
}
#[test]
fn test_devices_long() {
let mut adb = new_client();
adb.devices_long().expect("cannot list devices long");
}
#[test]
fn test_static_devices_long() {
let inputs = ["7a5158f05122195aa device 1-5 product:gts210vewifixx model:SM_T813 device:gts210vewifi transport_id:4",
"n311r05e device usb:0-1.5 product:alioth model:M2012K11AC device:alioth transport_id:58",
"192.168.100.192:5555 device product:alioth model:M2012K11AC device:alioth transport_id:97",
"emulator-5554 device product:sdk_gphone64_arm64 model:sdk_gphone64_arm64 device:emu64a transport_id:101"];
for input in inputs {
DeviceLong::try_from(input.as_bytes().to_vec())
.expect(&format!("cannot parse input: '{input}'"));
}
}
#[test]
fn test_send_recv() {
// Create random "Reader" in memory
let mut key = [0u8; 1000];
rand::thread_rng().fill(&mut key[..]);
let mut c: Cursor<Vec<u8>> = Cursor::new(key.to_vec());
let mut device = new_device();
const TEST_FILENAME: &'static str = "/data/local/tmp/test_file";
// Send it
device
.send(&mut c, TEST_FILENAME)
.expect("cannot send file");
// Pull it to memory
let mut res = vec![];
device
.recv(TEST_FILENAME, &mut res)
.expect("cannot recv file");
// diff
assert_eq!(c.get_ref(), &res);
device
.shell_command::<&str>([format!("rm {TEST_FILENAME}").as_str()])
.expect("cannot remove test file");
}
#[test]
fn multiple_connexions() {
let mut connection = new_client();
for _ in 0..2 {
let _ = connection.devices().expect("cannot get version");
}
}
#[test]
fn command_emulator() {
let mut connection = new_client();
let mut emulator = connection
.get_emulator_device()
.expect("no emulator running");
emulator.hello().expect("cannot hello");
}
}