Subsystem technology and ecology may memorabilia | square one plan launched, Boca launched xcm!

2022/05  The first 20 period

This monthly report is made by Substrate Evangelist @ Caisongjian's creation

Hi, All attention  Substrate  Technology developers ：

「Substrate Monthly technical report of ecological project 」 from OneBlock+ Produce , Monthly summary Substrate Technical progress of projects in various fields of ecology , This article is  Substrate  Ecological projects 5 Monthly technical monthly report , Enjoy!

01 Important submission and release

1.  from sc-network Extract synchronization protocol from （sc-network Contains a fairly general underlying network protocol stack , Synchronization and transaction protocols can be implemented on it .sc-network It not only exposes the underlying network stack API, Methods for synchronizing and transaction related operations are also disclosed API, It is necessary to pull out the part of the synchronization protocol ）, The following is the latest progress of synchronous protocol reconfiguration ：

• The first part ： Remove with minimal dependency  sc_network::chain::Client 

• The second part ： Migrate some shared data structures to  sc-network-common 

• The third part ： Migrate some data structures to  sc-network-light 

• The fourth part ： sc-network  Only depends on  sc-network-common , sc-network-light  Only depends on  sc-network-common , sc-network-sync  Only depends on  sc-network-common sc-service  Only rely on all the above to instantiate the concrete implementation .

2. BoundedVec  Implement serialization and deserialization BoundedVec Not implemented before serde::{Serialize, Deserialize}, So it can't be GenesisBuild Use in , Because it needs to implement ：

 sp_runtime::traits::MaybeSerializeDeserialize .

3. bag-list pallet Some important updates have been made （bag-list pallet It can be used to elect Boca network top x Verified by ,bag Is a sorted list ）, Mainly as follows ：

• to update bag-list pallet Event and error handling   Updated  bag-list  Of Error and Event,bag-list pallet It is a mechanism used in the election process of Boca nominees ;

• allow defensive Operation to hold certificates ;

• bag-list New score function   The score is mainly used to indicate the nomination of the verifier pledge , The amount of nominations approved by the verifier is equal to its own pledge plus the amount nominated by all its nominees ;

4. The nominee pool has been updated and partially bug Repair , Mainly as follows ：

• Added more events to the nominee pool and fixed some bug  When a member leaves or is kicked out of the current nominee pool and the transaction amount is not 0 Issue an event when ; Fixed a problem that would kill the account prematurely bug; Fix a problem that allows unauthorized users to unbind the amount bug;

• newly added update_role Callable functions   Used to explicitly update member roles in the nominee pool ;

• Add... To the nominee pool MinPointsToBalance Configurable constants   Set the previous fixed ratio to a configurable constant , It is mainly used to verify people's scores and balance A configuration between , It is necessary to ensure that the ratio is lower than this constant ;

• The role of the nominee pool becomes optional   The nominees pool can now have explicitly optional roles , You can also do this by setting the role to some public keyless address , But this is a little inconvenient . Now? , Roles can be simply set to None. Now? , A pool of nominees can be expressed as follows : If you will root Set to none, It means that I will not change any roles . If the nominee is set to none, It means I will never change the nomination . If I set my state switcher to none, That means I can never destroy this pool of nominees ( Unless it is cut 90%). Be careful , if necessary , Governance can be reset to any of the above ;

• towards westend runtime Add nomination pool to .

5. pallet Introduction in #[pallet::call_index]  by pallet Add an attribute to the callable function in #[pallet::call_index($idx)] , Used for restoration Call The encoding and decoding order of the corresponding enumeration variant in the enumeration .

6.  remove [pallet::without_storage_info] macro   at present pallet All storage for has been implemented  MaxEncodedLen .

7.  Optimize the memory utilization of the working machine under the chain   There are two main optimizations ：

• Read snapshots using preallocation .

• adopt  filter_map  To use preallocation .

02 Design scheme and problem discussion

1.  all FRAME Storage of transactions

Storage layer ： stay Substrate There is already one called  transactional  The concept of , It can explicitly commit or rollback transactions , But this API A little stiff , Because the expected return type is  TransactionOutcome, But often we need to know some internal call results . Two new auxiliary functions are introduced  with_storage_layer  and  in_storage_layer .

• with_storage_layer  Just return a Result. If the return value is Ok, Automatically commit the store , If the return value is Err, Automatically restore the storage . such , A closed function does not need to know that it is in the transaction storage layer , This allows easier use of storage tiers .

• in_storage_layer  It only generates a new storage layer when a storage layer does not exist . therefore , If there is no storage tier , with_storage_layer  and  in_storage_layer  Exactly the same . otherwise , If a storage tier already exists , Only closed functions are executed in the storage layer .

For actual development  #[transactional]  It's out of date .

2.  Allow the nominee pool to freeze and some bug Repair  

This is a nomination pool pallet A big update of .

• The verifier can only release the amount of their pledge binding after other people leave completely . This helps to ensure that the amount of pledge binding in the nominee pool remains at  MinimumNominatorBond  above , So that all nominees can leave smoothly .

• When the verifier wants to leave , They must invoke the new chill Transactions to freeze pool nominees , Make it lower than  MinimumNominatorBond .

• Fixed a code error that partially unbound the pledge , This will lead to slash The calculation is incorrect in the case of .

• Fix one slash Code for , May lead to excessive slash.

03 Documents and materials

Square One 

• Square One yes Parity A new plan for , For new and early creators in Substrate Provide ecological direction and customized support services in ecology . stay Substrate There are many ways to build on , There are also many toolkits and education in ecology 、 Resources developed and funded .

Parity Signer 5.0 Beta 

• Parity Signer, Parity  in the light of Substrate Chain based smart phone cold storage solution , This is by far the most comprehensive update .5.0 The beta is now available in iOS App Store、 Google Play And the project Github Warehouse downloading , New function of changing rules , Based on qr Offline update for . Although optimized for the highest security requirements , but Signer Still in the testing phase , Wait for the ongoing audit to complete , So users should keep this in mind , And always back up their accounts .

04 Technology ecology and community

2022 Boca hackson contest  

• 2022 Boca hackson global recruitment has officially started ！ The competition was held by Parity And OneBlock+ The host , It is expected that all developers around the world who want to know about blockchain and open network will sign up to participate . Whether it's an entrepreneurial team with rich development experience , Or do you want to enter Web3 Traditional Internet developers , We are looking forward to creative and thoughtful developers to join this competition , Create together Web3.

Enter the entrepreneurial era of Boca hacker song AMA series 2

• AMA The second phase is invited to The first Boca hackson competition “ Most popular developer Award ” The winner Web3Games Introduce the development of the project , And how to successfully start a business by taking the opportunity of participating in the Boca hackson competition ！Web3Games It is an integrated blockchain game platform , It's a player creation , A platform for all blockchain game related content . By integrating blockchain technology 、NFT and DeFi Combined with virtual games ,Web3Games It provides an ecosystem in which both players and developers can have their own game ownership .

Enter the entrepreneurial era of Boca hacker song AMA series 3

• In this issue OneBlock+ The invitation Parallel The engineer - Zhou Yang shared with you about  Parallel The foundation and development of , And the valuable experience of participating in the poca hackson competition .

Boca hackson opening ceremony

• This invitation is to Parity Head of Asia Pacific @Helena,Parity The engineer @Jimmy, Introduce the progress of Poka ecology and developer support, as well as the details of hacksong and the rules of the competition .

05 Cross Chain Protocol

Polkadot go online XCM  Poca in v0.9.19 The version upgrade has been launched and passed XCM The function of message transmission between parallel chains . Boca's vision of cross chain interoperability is thus opened ！

Repair and runtime-benchmarks dependent pallet-xcm toml The problem of   Fixed a problem due to runtime-benchmarks features Compilation errors caused .

The Committee on the relay chain can send XCM news   The Committee on the relay chain can pass  pallet_xcm  Sending transaction .（ At present pr be in review Stage ）

About us

One Block+ It's the biggest in China Substrate Technology developer community , It's also Parity The only operating partner in Asia , The founder of Poka's Early Ecological Project 、CTO、 Most of the core developers come from One Block+ Community .

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