Контракт с одним адресом на все EVM-блокчейны: как работает Safe Singleton Factory

Когда мне понадобилось задеплоить один и тот же контракт в разные EVM-сети с одинаковым адресом — оказалось, что всё не так просто. Даже если всё заранее посчитать и подготовить, любой лишний nonce может всё сломать. В этой статье я разбираю, как вообще формируется адрес контракта при деплое (при использовании CREATE и CREATE2), зачем появился Deterministic Deployment Proxy, и почему Safe в итоге сделали свою версию — Safe Singleton Factory. Расскажу, как ей воспользоваться через Remix, Foundry и Hardhat, на что стоит обратить внимание (например, при работе с байткодом), и какие грабли могут ждать при попытке всё упростить.

https://habr.com/ru/articles/934426/

#CREATE #CREATE2 #CREATE3 #Safe_Singleton_Factory #EVM #deploy #Deterministic_Deployment_Proxy #proxy #smartcontract #safe

Robot Imagination:

My robots report "life stats".

Yesterday, TurtleBot5-WaLI reported multi-thousands of "playtimes" in only 4100 hours of "life". (not possible)

Reviewing how he computes stats, the issue became clear - WaLI "Noticed Docking Success" once a minute for a long, long time after an undocking failure.

When writing my state machines, I try to imagine all the transitions needed, but robot WaLI always demonstrates greater imagination.

#Create3 #ROS #Turtlebot #robot #statemachine

My Pets - Never need to taken out to do their business, don't need to be fed, never make a mess while I'm away...BUT they do demand I teach them something way too often.

TurtleBot5-WaLI (Wallfollower Looking For Intelligence) is running ROS2 Jazzy, and HumbleDave2 (Just Dave) is running ROS2 Humble Hawksbill.

TB5-Wali has been "alive" for 2056 hours since Jan 9, 2025.

HumbleDave2 has self docked 1283 times in his four years of life to date.

#Create3 #GoPiGo3 #RaspberryPi5 #robot

(Again) so excited that my #ros2humble wallfollower.py node drove my #Create3 #robot “WaLI (wallfollower looking for intelligence)” to follow 17 meters of six connected walls!

So far it is subscribing to five topics /ir_intensity (range to wall and obstacle detection), /hazard_detection (bumpers), /ir_opcode (virtual wall), /kidnap_status (lifted by human), and /odom (pose), and a seven state machine managing seven motion actions/reactions.

Now to “parameterize” and “generalize” it.

#Create3 #IRsensor SLAM - First Attempt

My ir2scan node is working well, but setting the 52 #slam_toolbox params is a mystery.

My create3_navigation slam.launch.py (using #Turtlebot4 LIDAR parms modified for Create3 IR "distance" sensor scan), with Wali facing a wall, maps a wall!

(bouncing around in angle in front of bot...)

As I proceed to drive Wali around the room, more walls enclosing a "known to be open" space are mapped, but not where the sensors and #odometry put them.

#Create3-WaLi (my "Wallfollower Looking for Intelligence" #robot) became truly #autonomous today. When he wakes up he starts being WaLi without my help. (#ROS2 #Humble in #Docker on #RaspberryPi5 #PiOS #Bookworm)

He doesn't use much of his existing intelligence yet, but he knows when to get off his dock (battery > 99%), when to prepare for re-docking (battery < 20%), when (battery < 15%) and how to dock.

He also knows how to use his "lowly" IR intensity sensors as a make-shift #LIDAR.

#Create3-Wali #Robot

Dress Rehearsal
Full Load #RaspberryPi5
Power System Test

Full load (1min 4.96): No Throttling - NO PROBLEM.

Wali with 14.4v powered USB hub inside cargo drawer:

(WaLi: Wall follower Looking for Intelligence)

The Pi5 has #ros2humble running in #Docker over PiOS 64-bit Bookworm Desktop

**Terrible Turmoil Totally Too Talkative (in my head)**

After 7 years of working with my two #GoPiGo3 robots, and that great community, I am way too overly excited to be building a new #robot

#Create3 WaLi: Wall follower Looking for Intelligence

There is a heavy feeling of abandonment of my dreams for my current robots, Carl and HumbleDave.