CN111181715A - Multi-party cross-linking method based on consistent Hash consensus protocol - Google Patents
Multi-party cross-linking method based on consistent Hash consensus protocol Download PDFInfo
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- G06F9/44—Arrangements for executing specific programs
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- G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
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Abstract
The invention discloses a multi-party cross-linking method based on a consistent Hash consensus protocol, which comprises the following steps: (1) formulating a consensus protocol for the multi-party cross-chain system; (2) finding out the position of the corresponding virtual node according to a consistent hash algorithm; (3) the multi-party users perform interaction (4) and store user data to corresponding virtual nodes; (5) and requesting multi-party cross-chain verification interaction (6), triggering an intelligent contract to perform a cross-chain consensus process after receiving a verification interaction request, passing the interactive verification, and completing data cross-chain after consensus is achieved. The multi-party cross-chain method can realize the high-efficiency consensus among cross-chains, and improves the efficiency of the consensus through the consistent hash algorithm so as to realize the load balance of the system during the cross-chain interaction of multiple parties.
Description
Technical Field
The invention belongs to the technical field of block chains, and particularly relates to a multi-party cross-chain method based on a consistent Hash consensus protocol.
Background
The block chain is essentially a decentralized distributed chain system, the system can comprise mutual cooperation of a plurality of chains, the unique distributed chain structure realizes uplink data traceability, and functions of non-falsification, non-forgery and the like are realized on the basis of a cryptography technology and a consensus mechanism, so that safety and data sharing among the plurality of chains of the block chain are coordinated. However, the problems of interoperability and consistency between blockchain chains are gradually highlighted because of the strong specificity and the wide variety of each chain on the blockchain and the increase of the number of applied multi-chain channels of the blockchain.
The core technology of distributed systems is the consensus technology. In the P2P network of the distributed system of the blockchain, the process that nodes which are not trusted with each other finally reach data consistency by following a preset mechanism is called a consensus process, so that data of all nodes of the blockchain whole network are shared by a distributed consistency protocol. The cross-chain technology is more and more concerned by people, and designing an efficient consensus mechanism to improve the throughput of the block chain cross-chain process gradually becomes one of the key problems of the cross-chain. Currently, there are three more common types of cross-chain techniques that are generally defaulted:
(1) the notary mechanism (notary schemes) refers to that a notary is elected to supervise an event on a certain chain and automatically execute a corresponding event on another chain through an intelligent contract. And the notarization people perform consensus verification on the event through a preset consensus mechanism.
(2) The side chains or relays (sidechains/relays) are based on a light client authentication technology, and verify whether a specific transaction, event or state information of a certain chain occurs or not by verifying a cryptographic hash tree (cryptographic hash tree) and a block header (block header) of the certain chain, and then automatically execute the specific transaction, event or state information on another chain through an intelligent contract.
(3) Hash-locking (Hash-locking) refers to that a specific intelligent contract is operated on a chain where two parties performing transaction are located, so that cross-chain transaction and information interaction are achieved. The process of realizing cross-chain transaction through hash locking comprises the following steps: a) the user A generates a random number s, calculates the hash value of the random number and sends the hash value to the user B; b) a and B lock respective assets through smart contracts; c) if B receives correct s in a certain time, automatically executing the asset transfer of B to A through an intelligent contract, otherwise returning to B; d) if A receives the correct random number s in a certain period of time, the assets of A will be automatically transferred to B, otherwise return to A.
The common consensus mechanisms include POW (workload certification), POS (rights and interests certification), DPOS (rights and interests certification), BFT (byzantine fault-tolerant algorithm), a new consensus mechanism formed by combining different consensus mechanisms, or a new consensus algorithm formed by improving various consensus algorithms, such as POW + POS, BFT + POS, etc., or DBFT, PBFT, etc., and various consensus methods based on a consistency algorithm, such as Paxos, Raft, etc., where the consistency hash algorithm allocates storage tasks based on a hash function, thereby realizing load balancing of servers when the system processes the tasks. In general, the state of the art for evaluating the consensus mechanisms requires the following conditions to be met: (1) safety: whether common attacks, such as double blossom attacks, selfish mining attacks, eclipse attacks, Sybil attacks and the like can be prevented, and whether the fault tolerance is good. (2) Expansibility: the scalability mainly considers the changes of system load and network traffic caused by the increase of the number of system members and the number of transactions to be confirmed, which are usually measured by the network throughput. (3) Performance: the system can process the number of confirmed transactions per second, which can also be measured in terms of network throughput. (4) Resource consumption: the consensus mechanism on the blockchain achieves consensus by means of computational resources or network communication resources.
Aiming at a certain block chain application scene, cross-chain consensus is realized, which relates to the selection of the cross-chain mode, a consensus mechanism is correspondingly deployed on the basis of the selected cross-chain mode, the condition of reaching an ideal consensus state is met, and efficient cross-chain consensus is realized by matching with a certain scene of a block chain.
It can be said that cross-chain technology is key to implementing a blockchain, particularly a value network for a federation chain or a private chain. At present, in a federation chain, organizations realize service isolation and data access by building channels, a consensus mechanism is a core for realizing consistency among the organizations, and different organizations on the chain are allowed to own respective chains by the support of the federation chain and a private chain, and even multiple chains are allowed to run simultaneously in the same organization. At present, the number of global block chains is continuously increased, and networks of different block chains are mutually isolated, so that operations such as digital asset transfer, cross-chain communication and the like cannot be effectively executed among the chains. However, the main problems to be solved by the design and development of the mainstream cross-chain technology mainly include: asset transfer between different blockchains, implementation of settings to freeze asset lock and unlock conditions on a blockchain (and then associated with other chain-specific events or actions), reading and verifying status or events of other chains, enhancing blockchain transaction processing capabilities.
It can be seen that the current cross-chain technology cannot solve the growing demand of blockchain for cross-chain consensus, and various effective solutions are urgently needed to be proposed.
Disclosure of Invention
Based on the background and the problems in the prior art, the invention proposes a multi-party chain crossing method based on a consistent Hash consensus protocol, which can realize efficient consensus among chains. It is yet another object of the present invention to improve the efficiency of consensus through a consistent hashing algorithm to keep the load balance of the system in the process of cross-chaining of multiple parties. To achieve these objects and other advantages in accordance with the purpose of the invention, a multi-party cross-chaining method based on a consistent hash consensus protocol is provided, where a user U ═ { U ═ is1，U2，……，UnThe cross-chain interaction occurs between the two, and corresponding resources, U, need to be paid outiThe method generally refers to the ith user, and comprises the following implementation steps:
(1) formulating a consensus protocol for the multi-party cross-link system, and solving the user U according to the hash function of the consistent hash algorithmiWherein the user UiIn the chain XiThe above step (1);
(2) finding user U according to hash valueiWhen the corresponding virtual nodes are positioned on the Hash ring and cross-link interaction is prepared, a protocol of an interaction demand set A of each user is formulated;
(3) user U ═ { U ═ U1，U2，……，UnThe ith user is interacted with the ith user, and the interaction requirement matrix of the ith user is Ai＝(ai1，ai2，……，aij，……，aim) Wherein a isijE.g. Z, representing the requirement condition of the ith user for the jth interaction, wherein m represents m data objects, namely representing the requirement condition of m interactions;
(4) from user UiStarting from the position of (A), finding the first node along the direction d, and connecting UiWherein d is generally clockwise;
(5) according to user UiDistributing required resource e for the interaction requirement condition, solving the position of data related to the interaction on a hash ring according to a hash function of a consistent hash distribution algorithm, corresponding to the data related to the user and the interaction by searching a node position table, and in a chain XiUser U ofiForward the need to on-chain XxUser U ofxRequesting to verify the interactive content;
(6) and receiving a verification interaction request, triggering an intelligent contract, executing a cross-chain consensus protocol, passing the verification of the interaction content, and completing the cross-chain transfer of the resource after the consensus is achieved.
Preferably, the consistent Hash consensus protocol in step (1) further includes a user UiNodes forming various processing messages, including proposal nodes, for proposing interactive proposals (proposal number PID and proposal content V); the consensus node participates in the process of verifying consensus; the backup node acquires an approved proposal; (theoretically, all nodes in the blockchain may be a proposed node, a consensus node, and a backup node). The specific implementation method comprises the following steps:
1.1 preparation (Prepare) phase: the proposal node generates a globally unique and incremental PID, and sends a request message (for carrying out consensus verification) for preparing a verification proposal, which only carries the PID, to all the consensus nodes, wherein the content of the message at the moment does not need to carry the proposal content V;
1.2 verification (verify) phase: proposing a proposal (including PID and V) by the proposing node, verifying the proposal by the consensus node, and showing that the whole network agrees with the proposal through verification and all the nodes are ready to receive the proposal;
1.3 receiving (Accept) phase: after receiving the messages passing the verification of the majority of the consensus nodes, the proposal node sends a notice of preparing backup proposals to the backup node, and the backup node uniformly distributes node processing for each proposal by adopting a consistent hash algorithm aiming at the data object type represented by the PID in each received message, thereby realizing the load balance of the node processing proposal data;
1.4 backup (back-up) phase: the proposal node informs the backup node of preparing to backup the proposal aiming at the proposal passing the verification, the proposal reaching the consistency consensus after the verification passes is sent to the backup node, and the backup node carries out backup, wherein, m is more than 0.5n and less than or equal to n, and n is all nodes of the whole network;
1.5 recovery (reply) phase: and after each backup node finishes the backup, replying to the proposal node, and continuously finishing the cross-chain transfer of the corresponding interactive resources through the proposal node.
The object of the present invention can be further achieved by the consistent hash algorithm in step (1) or (2), in the process of achieving load balancing by using the consistent hash algorithm, the number of actual servers N is set to be N, service is provided for users, the number of virtual nodes is P, where P is much larger than N, and when there are fewer servers, virtual nodes need to be correspondingly added, the method includes:
2.1 equally dividing the Hash ring into P intervals;
2.2 each interval takes each virtual node as an end address, and each virtual node is responsible for mapping the key value of the corresponding interval;
2.3 after the key value is subjected to modulus extraction, carrying out one-time modulus extraction operation on the number of the intervals to find out a corresponding virtual node;
2.4 setting memory according to memory capacity and PerformanceThe weight E of the storage server is set as a storage reference value N0Is set to E0Comparing the storage of each server with the storage reference value of the server to obtain
Then, the P virtual nodes are listed according to the weight { E1，E2，……，EnIs averagely allocated to the corresponding node U ═ U1，U2，……，UnStorage server of { N } {1，N2，……，Nn}；
2.5 when the storage server or the node changes (when a new server or a node is added or quitted), the virtual node is acquired or released according to the weight value E of the server or the resource E required by the node. If the distribution of the nodes is changed, a large influence is caused on the existing redistribution of the data, so when the storage server is changed, the virtual nodes need to be acquired or released according to the weight values of the storage server, that is, the corresponding relationship between the virtual nodes and the server influences the change of the consistent hash structure.
In this way, since the number of virtual nodes as a whole does not change much, when the storage server or the node (user) changes, the influence on the whole system is minimized. The newly added server or node (user) only needs to integrally migrate the load of other virtual nodes, so that repeated hash calculation on information during data migration can be avoided, and load balance of the system is ensured. Because the weight is added to each storage server, when the system senses that the system has a data imbalance condition (including data overload, underload and balance states), the task allocation state (including storage, processing, calculation and the like) of the virtual node can be dynamically adjusted according to the weight of the storage server.
Preferably, the process of implementing load balancing further comprises: setting a standard threshold value as s% and a virtual node load highest threshold value as LHThe minimum load threshold is LLWhen L is presentH-LL>s%, when the data overload occurs, the virtual node corresponding to the high-load storage node is weighted according to the data overloadAnd distributing the load to low-load nodes to enable the overall load value to be lower than s%, and realizing dynamic adjustment of the load.
Further, the step (3) includes: in the process of interaction of the user U, the total amount of related resources meets the conditions: u may constitute the interactable matrix A if and only if the equation is satisfied
When the user is in use, the interaction can be smoothly carried out.
Preferably, the step (4) or the process of implementing load balancing further includes implementing virtual node data backup and live migration, where the step of implementing virtual node data backup includes: and distributing tasks matched with the capacity of the server or each node according to the storage and processing capacity of the server or each node, wherein the capacity is matched, namely the tasks are distributed according to the weight E occupied by the server or the resources E required by the nodes by considering the size of the stored data and the resource requirement condition. The step of dynamically adjusting the state of the virtual node in response to the data migration condition further includes: when L isH-LL<s%, when the data is in a low load state, recalculating the positions of the nodes, updating the node position table, and migrating corresponding data according to a consistent hash algorithm and a recalculation result (at the moment, the data is migrated according to a new node mapping rule, and the load of each node after migration is balanced); when L isH-LLWhen the load is s%, the load is balanced.
Preferably, the implementation method of step (5) is to implement a multi-party cross-chain consensus protocol by deploying an intelligent contract on a blockchain, and the implementation steps include:
3.1 user UiGenerating a random number r, calculating the hash value h of the random number to be hash (r), and sending the hash value h to an interactive object Ux；
3.2 UiAnd UxLocking respective resources in sequence through an intelligent contract;
3.3 if UxReceiving the message that the interactive proposal passes the verification within the time T and receiving the correct r, the intelligent contract automatically executes to connect the UiAsset transfer to UxOtherwise, return to UiExecute U in the same wayiTo UxThe resource transfer of (2);
further, in step (1) or step (6), the master node is a node issuing a proposal, i.e. a proposed node, and the slave node is a node verifying the proposal, i.e. a consensus node, and the step of implementing cross-chain consensus includes:
4.1 Xichain master node UiBroadcasting interactive proposal to XxNode U on the chainx；
4.2 XiChain and XxThe main nodes on the chains broadcast respectively to prepare for interacting to the slave nodes of the respective chains;
4.3 Xichain and XxThe slave nodes on the chain respectively verify the interaction to be carried out, and broadcast the interaction preparation information to X after the verification is passediChain and XxAll nodes on the chain;
4.4 Xichain and XxThe nodes of the chain receive X with the number of miNodes on the chain, and a number m of XxNode-on-chain-same prepare message post broadcast acknowledgement (Commit) message to XiChain and XxAll nodes on the chain;
4.5 Xichain and XxThe nodes of the chain receive X with the number of miNodes on the chain, and a number m of XxThe nodes on the same group agree upon the same acknowledgement message.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The beneficial effects of the invention at least comprise: the cross-chain consensus protocol generates hash values for all users (nodes) based on a hash function of a consistent hash algorithm, configures virtual nodes on a hash ring, stores data on the virtual nodes, correspondingly finds addresses of related data through a list of user stored data, and dynamically adjusts data migration conditions caused by changes of a storage server or the users (nodes) by setting a load threshold value, thereby realizing dynamic load balancing. The cross-chain consensus method can realize multi-party interaction based on the alliance chain, but is not limited to the cross-chain consensus method, and by designing the multi-party cross-chain consensus method (which can be understood as a combination of the Paxos + PBFT consensus method), the interaction verification is realized, and on the basis of ensuring that the consensus can be successfully achieved, basic conditions of safety, expansibility, high performance and low resource consumption to be met by the consensus are met, namely the safety of cross-chain interaction is ensured, the throughput of the cross-chain interaction is improved through a consistent hash algorithm, the interaction efficiency among different chains is improved, and the increasingly growing cross-chain consensus requirement on the block chain is met. And supervision and inspection in interactive proposal and interactive process are realized.
Drawings
FIG. 1 is a schematic diagram of the overall architecture of the present invention;
FIG. 2 is a diagram of a consensus protocol process based on a consistent hashing algorithm according to the present invention;
FIG. 3 is a flow chart of cross-chain consensus according to the present invention.
Detailed Description
In order to clearly illustrate the present invention and make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that those skilled in the art can implement the technical solutions by referring to the description text, and the interactive processes of the specific implementations can be described by using the common asset transaction process as an example, so as to facilitate the understanding of those skilled in the art.
Specific example 1:
1. fig. 1 shows an overall architecture schematic diagram of a multi-party cross-link method based on a consistent hash consensus protocol according to an implementation form of the present invention, and the schematic diagram shows a model for carrying the method of the present invention, where a user U ═ { U ═ U { (U } { (U) } { (U }1，U2，……，UnCross-chain transactions occur between, assets need to be transferred, UiThe method generally refers to the ith user, and specifically comprises the following steps:
(1) formulating a consensus protocol for the multi-party cross-link system to realize smooth verification transaction, further ensuring the asset safety of the user, and solving according to the hash function of the consistent hash algorithmUser UiWherein the user UiIn the chain XiThe above step (1);
(2) finding user U according to hash valueiWhen the corresponding virtual nodes are positioned on the Hash ring and cross-link transaction is prepared, a protocol of a transaction requirement set A of each user is formulated;
(3) user U ═ { U ═ U1，U2，……，UnThe transaction is carried out, and the transaction requirement matrix of the ith user is Ai＝(ai1，ai2，……，aij，……，aim) Wherein a isijE.g. Z, representing the demand situation of the ith user for the jth transaction, wherein m represents m data objects, namely representing the demand situation of m transactions;
(4) from user UiStarting from the position of the virtual node, finding the first node along the direction d, and connecting the U with the first nodeiWherein d is generally clockwise;
(5) according to user UiDistributing required assets e according to the transaction requirement condition, solving the position of transaction data on a hash ring according to a hash function of a consistent hash distribution algorithm, matching users and the transaction data by searching a node position table, and performing X-ray linkiUser U ofiForward the need to on-chain XxUser U ofxRequesting a validation transaction;
(6) and receiving a verification transaction request, triggering an intelligent contract, executing a cross-chain consensus protocol, passing the transaction verification, and completing the cross-chain asset transfer after consensus is achieved.
Specific example 2:
2. in another example, the invention is used to implement a consensus protocol based on a consistent hashing algorithm, as shown in fig. 2. Using this approach has the advantage of achieving system load balancing. Also, this manner is merely an illustration of a preferred example, but not limited thereto. When the method and the device are implemented, the implementation mode of the application scene can be changed according to the requirements of a user. The consistent Hash consensus protocol in the step (1) further comprises a user UiMake up various treatmentsNodes of the message, including proposal nodes, for proposing a transaction proposal (proposal number PID and proposal content V); and (3) consensus nodes: participating in the process of verifying consensus; backup node: an approved proposal is obtained. All nodes in the blockchain may be a proposal node, a consensus node, and a backup node. All notification messages contain only PIDs. The specific implementation method comprises the following steps:
1.1 preparation (Prepare) phase: the proposal node generates a unique and incremental PID, and sends a request message (for carrying out consensus verification) for preparing a verification proposal, which only carries the PID, to all the consensus nodes, wherein the content of the message at the moment does not need to carry the proposal content V; (ii) a
1.2 verification (verify) phase: proposing a proposal by the proposing node, verifying the proposing content by the consensus node, and showing that the whole network agrees on the proposal (transaction) through verification and all the nodes are ready to receive the transaction of the proposal;
1.3 receiving (Accept) phase: after receiving the messages passing the verification of the m consensus nodes, the proposal node sends a notice of preparing backup proposals to the backup node, and the backup node uniformly distributes node processing for each proposal by adopting a consistent hash algorithm aiming at the transaction data type represented by the PID in each received message, thereby realizing the load balance of the node processing proposals;
1.4 backup (back-up) phase: the proposal node informs the backup node to prepare for backing up the proposed data according to the proposal that the verification passes, sends the proposal that the verification passes, namely the proposal that the consistency is identified, to all the backup nodes, and the backup nodes back up, wherein m is more than 0.5n and less than or equal to n, and n is all the nodes of the whole network;
1.5 recovery (reply) phase: after each backup node finishes the backup, the proposal node is replied, and the proposal node which passes the verification is proposed to continuously finish the transaction (the cross-chain transfer of the corresponding interactive resources).
The object of the present invention can be achieved by that in step (1) or (2), a consistent hash algorithm is used to implement load balancing, in the process of implementing load balancing, the number of actual servers N is set to be N, so as to provide services for users, the number of virtual nodes is P, where P is much larger than N, and when there are fewer servers, virtual nodes need to be correspondingly added, and the method includes:
2.1 equally dividing the Hash ring into P intervals;
2.2 each interval takes each virtual node as an end address, and each virtual node is responsible for mapping the key value of the corresponding interval;
2.3 after the key value is subjected to modulus extraction, carrying out one-time modulus extraction operation on the number of the intervals to find out a corresponding virtual node;
2.4 setting weight E of storage server according to storage capacity and performance, setting storage reference value N0And is set to E0Comparing the storage of each server with the storage reference value of the server to obtain
Then, the P virtual nodes are listed according to the weight { E1，E2，……，EnIs allocated to a corresponding node U ═ U1，U2，……，UnStorage server of { N } {1，N2，……，Nn}；
2.5 when the storage server or node (user) changes (when a new server or node is added or quitted), the virtual node is acquired or released according to the weight value E of the server or the resource E required by the node. If the distribution of the nodes is changed, a large influence is caused on the redistribution of the existing data, so that when the storage server or the nodes (users) are changed, the virtual nodes need to be acquired or released according to the weight values of the nodes, that is, the corresponding relationship between the virtual nodes and the server influences the change of the consistent hash structure.
In this way, since the number of virtual nodes as a whole does not change much, when the storage server or the node (user) changes, the influence on the whole system is minimized. The newly added server or node (user) only needs to integrally migrate the load of other virtual nodes, so that repeated hash calculation on information during data migration can be avoided, and load balance of the system is ensured. Because the weight is added to each storage server, when the system senses that the system has a data imbalance condition (including data overload, underload and balance states), the task allocation state (including storage, processing, calculation and the like) of the virtual node can be dynamically adjusted according to the weight of the storage server.
For example, the system standard threshold is set to 15%, and when the maximum load threshold of the system virtual node is set to LHAnd a load minimum threshold LLWhen compared to the virtual nodes of, i.e. when LH-LL>15%, when the load exceeds the threshold value, the system judges that data overload occurs, and at the moment, the virtual nodes corresponding to the high-load storage nodes are distributed to the low-load nodes according to the weight, so that the overall load value is lower than 15%, and the dynamic adjustment of the load is realized.
Specific example 3:
3. FIG. 3 is a flow chart showing the implementation of the cross-chain consensus of the present invention, which takes the asset transaction transfer as an example, and illustrates the specific implementation process of the multi-party cross-chain consensus of the present invention. Wherein the step (3) comprises: in the process of carrying out transaction by the user U, the total amount of related assets meets the conditions: u may constitute a tradable matrix A if and only if the equation is satisfied
In time, the transaction can be smoothly performed.
The step (4), or the process of implementing load balancing, further includes implementing virtual node data backup and live migration, where the step of implementing virtual node data backup includes: and distributing tasks matched with the capacity of the server or each node according to the storage and processing capacity of the server or each node, wherein the capacity is matched, namely the tasks are distributed according to the weight E occupied by the server or the assets E required by the node by considering the size of the stored data and the requirement condition of the assets. The step of dynamically adjusting the state of the virtual node in response to the data migration condition further includes: when L isH-LL<15%, when the data is in a low load state, recalculating the positions of the nodes, updating the node position table, and migrating corresponding data according to the consistent hash algorithm and the recalculation result (at the moment, the data is migrated according to a new node mapping rule, and the load of each node after migration is balanced); when L isH-LLWhen 15%, it is negativeLoad balancing status.
The method realizes the consensus protocol of multi-party cross-chain by deploying intelligent contracts on the block chain, and comprises the following specific implementation steps:
3.1 user UiGenerating a random number r, calculating the hash value h of the random number to be hash (r), and sending the hash value h to a transaction object Ux；
3.2 UiAnd UxLocking respective assets in sequence through an intelligent contract;
3.3 if UxReceiving the message that the transaction proposal is verified within the time T and receiving the correct r, the intelligent contract automatically executes to connect UiAsset transfer to UxOtherwise, return to UiExecute U in the same wayiTo UxThe asset transfer of (2);
further, in step (1) or step (6), the master node is a node issuing a proposal, i.e. a proposal node, and the slave node is a node verifying the proposal, i.e. a consensus node, and the step of implementing multi-party cross-chain consensus is as follows:
4.1 Xichain master node UiBroadcasting a transaction proposal to XxNode U on the chainx；
4.2 XiChain and XxThe master nodes on the chains respectively broadcast the slave nodes ready to carry out transactions to the respective chains;
4.3 Xichain and XxThe slave nodes on the chain respectively verify the prepared transaction, and broadcast the prepared transaction message to X after the verification is passediChain and XxAll nodes on the chain;
4.4 Xichain and XxThe nodes of the chain receive X with the number of miNodes on the chain, and a number m of XxNode-on-chain-same prepare message post broadcast acknowledgement (Commit) message to XiChain and XxAll nodes on the chain;
4.5 Xichain and XxThe nodes of the chain receive X with the number of miNodes on the chain, and a number m of XxThe nodes on the same group agree upon the same acknowledgement message.
The embodiments described above are presented to enable a person having ordinary skill in the art to make and use the invention. It will be readily apparent to those skilled in the art that various modifications to the above-described embodiments may be made, and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (8)
1. A multi-party cross-linking method based on a consistent Hash consensus protocol is characterized in that a user U is { U ═ U-1，U2，……，UnThe cross-chain interaction occurs between the two, and resources are paid out, UiThe method generally refers to the ith user, and the specific implementation steps comprise:
(1) formulating a consensus protocol for the multi-party cross-link system, and solving the user U according to the hash function of the consistent hash algorithmiWherein the user UiIn the chain XiThe above step (1);
(2) finding user U according to hash valueiWhen the position of the corresponding virtual node on the hash ring is ready for cross-link interaction, a protocol of an interaction demand set A of each user is formulated;
(3) the user U carries out interaction, and the interaction requirement matrix of the ith user is Ai＝(ai1，ai2，……，aij，……，aim) Wherein a isijE.g. Z, representing the requirement condition of the ith user on the jth interaction, wherein m represents m data objects;
(4) from user UiStarting from the position of the virtual node, finding the first adjacent node along the direction d, and connecting the U with the nodeiTo the virtual node;
(5) according to user UiDistributing required resources e for the interaction requirement condition, solving the position of data related to the interaction on a hash ring according to a hash function of a consistent hash distribution algorithm, matching the interaction data related to the user and the interaction by searching a node position table, and chainingXiUser U ofiForward the need to on-chain XxUser U ofxThe resources of the server are locked to request for verifying the interactive content;
(6) and receiving a verification interaction request, triggering an intelligent contract, executing a cross-chain consensus protocol, passing the interactive verification, and completing the cross-chain transfer of resources after consensus is achieved.
2. The multiple-party cross-chaining method based on consistent Hash consensus protocol according to claim 1, wherein the consistent Hash consensus protocol in step (1) further comprises a user UiThe nodes forming various processing messages comprise proposal nodes and are used for proposing interactive proposals, wherein the proposals comprise proposal numbers PID and proposal contents V; the consensus node participates in the process of verifying consensus; the backup node acquires the approved proposal, and all nodes in the block chain can be proposal nodes, consensus nodes and backup nodes; all notification messages contain only PIDs; the protocol consists of:
1.1 preparation phase: the proposal node generates a unique and incremental PID and sends a request message carrying only the PID for preparing verification proposal to all the consensus nodes;
1.2 verification phase: proposing a proposal by the proposing node, verifying the proposal by the consensus node, and informing all nodes to prepare for receiving the proposal after the proposal is verified;
1.3 receiving stage: after receiving the messages passing the verification of the m consensus nodes, the proposing node sends a notice of preparing backup proposals to the backup node, and the backup node uniformly distributes node processing for each proposal by adopting a consistent hash algorithm aiming at the data object type represented by the PID in each received message;
1.4 backup stage: the proposal node informs the backup node of preparing to backup the proposal aiming at the proposal passing the verification, the proposal passing the verification is sent to the backup node, and the backup node carries out backup, wherein, m is more than 0.5n and less than or equal to n, and n is all nodes of the whole network;
1.5 recovery phase: and after each backup node finishes backup, replying to the proposed node, and proposing the proposed node passing verification to continuously finish the cross-chain transfer of the corresponding interactive resources.
3. The multi-party cross-linking method based on the consistent hash consensus protocol according to claim 1, wherein in step (1) or (2), a consistent hash algorithm is used to implement a load balancing process, the number of actual servers N is set to be N, a service is provided to a user, the number of virtual nodes is P, where P is much larger than N, and when there are fewer servers, virtual nodes need to be correspondingly added, the method comprising:
2.1 equally dividing the Hash ring into P intervals;
2.2 each interval takes each virtual node as an end address, and each virtual node is responsible for mapping the key value of the corresponding interval;
2.3 after the key value is subjected to modulus extraction, carrying out one-time modulus extraction operation on the number of the intervals to find out a corresponding virtual node;
2.4 setting weight E of storage server according to storage capacity and performance, setting storage reference value N0Is set to E0Comparing the storage of each server with the storage reference value of the server to obtain
Then, the P virtual nodes are listed according to the weight { E1，E2，……，EnIs averagely allocated to the corresponding node U ═ U1，U2，……，UnStorage server of { N } {1，N2，……，Nn}；
2.5 when the storage server or the node changes, the virtual node is obtained or released according to the weight value E of the server or the resource E required by the node.
4. The method of claim 3, wherein the process of implementing load balancing further comprises: setting a standard threshold value as s% and a virtual node load highest threshold value as LHThe minimum load threshold is LLWhen L is presentH-LL>s%, when the threshold value is exceeded,and when data overload occurs, distributing the virtual nodes corresponding to the high-load storage nodes to the low-load nodes according to the weight, so that the overall load value is lower than s%, and realizing dynamic adjustment of the load.
5. The multiple-party cross-chaining method based on the consistent Hash consensus protocol according to claim 1, wherein the step (3) comprises: in the process of interaction of the user U, the total amount of related resources meets the conditions: u may constitute the interactable demand matrix A if and only if the equation is satisfied
When the user is in use, the interaction can be smoothly carried out.
6. The multiparty cross-chaining method based on the consistent hash consensus protocol according to claim 1, 3 or 4, wherein in the step (4), or a process of implementing load balancing, further comprising implementing virtual node data backup and live migration, wherein the step of implementing virtual node data backup comprises: distributing tasks matched with the capacity of the server or each node according to the storage and processing capacity of the server or each node, wherein the capacity matching comprises the steps of considering the data size of the storage content and the resource demand condition, namely distributing the tasks according to the weight E occupied by the server or the resource E required by the node; the step of dynamically adjusting the state of the virtual node in response to the data migration condition further includes: when L isH-LL<s%, when data is in low load, recalculating each node position, updating the node position table, migrating corresponding data according to the consistent Hash algorithm and the recalculation result, and when L is less than the thresholdH-LLWhen the load is s%, the load is balanced.
7. The multi-party cross-linking method based on the consistent hashing consensus protocol according to claim 1, wherein the step (5) is implemented by deploying an intelligent contract on a blockchain to implement the multi-party cross-linking consensus protocol, and the implementation steps include:
3.1 user UiGenerating a random number r and calculatingSending the hash value of the random number to an interactive object Ux；
3.2 UiAnd UxLocking respective resources in sequence through an intelligent contract;
3.3 if UxReceiving the message that the interactive proposal passes the verification within the time T and receiving the correct r, the intelligent contract automatically executes to connect the UiResource transfer to UxOtherwise, return to UiExecute U in the same wayiTo UxThe resource transfer of (1).
8. The multiparty cross-chaining method based on the consistent hash consensus protocol according to claim 1, wherein in step (1) or step (6), the master node is a proposal node, the slave node is a consensus node, and the step of implementing multiparty cross-chaining consensus comprises:
4.1 Xichain master node UiBroadcasting offer interactive content to XxNode U on the chainx；
4.2 XiChain and XxThe main nodes on the chains respectively broadcast messages to be interacted to the slave nodes of the respective chains;
4.3 Xichain and XxThe slave nodes of the chain respectively verify the interaction to be carried out, and broadcast the interaction preparation message to X after the verification is passediChain and XxAll nodes on the chain;
4.4 Xichain and XxThe nodes of the chain receive X with the number of miNodes on the chain, and a number m of XxBroadcast acknowledgement messages to X after the same prepare messages by the nodes in the chainiChain and XxAll nodes on the chain;
4.5 Xichain and XxThe nodes of the chain receive X with the number of miNodes on the chain, and a number m of XxThe nodes on the same group agree upon the same acknowledgement message.
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