CN115208956A - Method for realizing block chain gateway - Google Patents
Method for realizing block chain gateway Download PDFInfo
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- CN115208956A CN115208956A CN202210719359.9A CN202210719359A CN115208956A CN 115208956 A CN115208956 A CN 115208956A CN 202210719359 A CN202210719359 A CN 202210719359A CN 115208956 A CN115208956 A CN 115208956A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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Abstract
The invention discloses a method for realizing a block chain gateway, which is characterized in that an intelligent contract deployment worker carries out management operation on an intelligent contract according to actual needs, various management operation events are stored on a block chain in a consensus mode, an intelligent contract management module is arranged on a block chain link point and used for managing the operation events of the intelligent contract, meanwhile, the intelligent contract management module provides an event subscription service for the outside, the block chain gateway carries out event subscription to the intelligent contract management module of each block chain node in the block chain, corresponding operation is completed according to event information of the intelligent contract, and dynamic adjustment of the gateway service is carried out. The block chain gateway of the invention supports intelligent contract discovery and dynamic service state maintenance, and is convenient for the butt joint of a block chain system and an external service system.
Description
Technical Field
The present invention belongs to the field of block chain technology, and more particularly, to a method for implementing a block chain gateway.
Background
With the continuous application of the blockchain system in practical scenarios, the blockchain system generally needs to interface with an external system through a blockchain gateway. Since the corresponding service logic is carried in the intelligent contract, the interface of the external system and the blockchain is essentially a method of the intelligent contract. Fig. 1 is a schematic diagram of a scenario of a blockchain gateway. As shown in fig. 1, the service system is an upper layer system in different scenarios, which may be a complete system including a front end and a background, and which interfaces with blockchain nodes to fulfill the requirements of decentralized storage and tamper resistance of data, and provides an interactive capability for an end user. The service system and the block chain link point are connected through a block chain gateway, the block chain gateway provides a service interface such as HTTP for the outside to receive the service request, and sends a block chain transaction request to the block chain according to the received service request. The blockchain gateway can be connected with a plurality of nodes, and transaction requests sent to the blockchain network can be randomly distributed to different nodes. The intelligent contract is a carrier of the custom data processing logic in the blockchain system, and each node maintains a local intelligent contract. Most transaction requests received by the blockchain nodes specify an intelligent contract method which needs to be called, the processes such as consensus and the like are carried out, and finally the transaction requests and execution results are stored in an account book, and at the moment, the state of the account book of the whole blockchain network is consistent or most of the state of the account book is consistent.
In practical scenarios, due to the complexity of the service, one service system may need multiple intelligent contracts for performing on-chain interaction, or one blockchain system may directly carry contracts associated with multiple service systems. Due to the difference of the actual requirements of the service systems and the difference of each contract method and parameter definition, each new service access involves the service upgrade and interface update of the gateway, and the work is repeated, complicated and easy to make mistakes. In addition, when the state of the intelligent contract on the chain changes, the gateway cannot make adjustment in time. The existing block chain gateway is used as a calling bridge of an external business system and a block chain, an external request is analyzed into an internal contract for calling, a contract response is converted into an external response, the complexity of intelligent contract calling is shielded to a certain extent, but the existing block chain gateway lacks an interactive flow with the block chain, lacks flexibility and has the following three problems:
1. the deployment of each contract requires adding related configuration information at the gateway, which increases the workload of service docking.
2. Any contract update may require a re-modification of the gateway's service interface structure without flexibility.
3. As a kind of middleware, the gateway service state is not closely associated with the contract state, and cannot reflect the real block chain service state to the business system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method for realizing a blockchain gateway, which supports intelligent contract discovery and dynamic service state maintenance and is convenient for butt joint of a blockchain system and an external service system.
In order to achieve the above object, the method for implementing a blockchain gateway of the present invention includes the following steps:
s1: the intelligent contract deployment personnel perform management operation on the intelligent contract according to actual needs, all management operation events are commonly identified and stored on a block chain, the management operation of the intelligent contract comprises intelligent contract deployment, starting, stopping, multiplexing and updating, wherein in the intelligent contract deployment process, all method information contained in the intelligent contract is analyzed and comprises method names, method return values, method parameter names and types, and the method information forms intelligent contract description information and is commonly identified and stored on the block chain after being integrated into a specified format;
s2: setting an intelligent contract management module in a block chain node, wherein the intelligent contract management module is used for managing operation events of intelligent contracts, and simultaneously providing an event subscription service for a subscriber to push corresponding notification information to the subscriber after the operation events of the intelligent contracts occur; the block chain gateway subscribes an event to an intelligent contract management module of each block chain node in the block chain, when the notification information pushed by the block chain link nodes contains event information of a certain intelligent contract, the number of the block chain link nodes sending the event information is counted, if the number exceeds a preset threshold value, the state change is effective, the step S3 is carried out, and otherwise, no operation is carried out;
s3: the block chain gateway completes corresponding operation according to the event information of the intelligent contract, and performs dynamic adjustment, wherein the dynamic adjustment comprises the following conditions:
1) After receiving the intelligent contract deployment event information, the block chain gateway automatically constructs a gateway service interface according to the intelligent contract description information, and the specific method comprises the following steps:
for each method contained in the intelligent contract, determining a gateway service interface name corresponding to the calling of the method according to the method name, automatically generating a service interface instance matched with the transaction request parameter of the method according to the method parameter name and type, and automatically analyzing the transaction request parameter calling the method into a linked transaction request calling the intelligent contract;
2) When receiving the intelligent contract starting or multiplexing event information, the block chain gateway starts a service interface corresponding to the intelligent contract;
3) After receiving the intelligent contract deactivation event, the block chain gateway changes the interface state of the intelligent contract calling service into unavailable state, namely, closes the intelligent contract calling service, redirects the request path of the related service to a contract deactivation dedicated path, and prompts the current state of the intelligent contract to the outside;
4) And after receiving the intelligent contract updating event, the block chain gateway acquires the updated intelligent contract information, judges whether the service interface of the intelligent contract needs to be updated according to the updated intelligent contract information, does not perform any operation if the service interface of the intelligent contract does not need to be updated, and automatically regenerates the intelligent contract to call the service related interface if the service interface needs to be updated.
According to the method for realizing the block chain gateway, an intelligent contract deployment worker manages and operates an intelligent contract according to actual needs, various management operation events are stored on the block chain in a consensus mode, an intelligent contract management module is arranged on a block chain link point and used for managing the operation events of the intelligent contract, meanwhile, the intelligent contract management module provides an event subscription service for the outside, the block chain gateway subscribes the event to the intelligent contract management module of each block chain node in the block chain, corresponding operation is completed according to event information of the intelligent contract, and dynamic adjustment of the gateway service is performed.
The invention has the following beneficial effects:
1) The invention automatically provides a callable service interface by analyzing the intelligent contract information, organically unifies two processes of a gateway interface for service system butt joint and a method interface for intelligent contract development of the block chain, and provides automatic gateway service construction capability, thereby simplifying the system butt joint process, enabling an external system to be directly butt-jointed with the block chain system according to the traditional interface, and shielding the extra call requirement of the internal intelligent contract.
2) The invention monitors the intelligent contract on the node, dynamically updates the service state and adjusts the corresponding operation through the event subscription service of the block chain node, and automatically adapts to the requirement of the actual application scene.
Drawings
Fig. 1 is a schematic view of a scenario of a blockchain gateway;
fig. 2 is a flowchart of an embodiment of a method for implementing a blockchain gateway according to the present invention;
FIG. 3 is a schematic flow diagram of a contract event subscription in the present invention;
fig. 4 is an exemplary diagram of constructing a gateway service interface in the present embodiment.
Detailed Description
Specific embodiments of the present invention are described below in conjunction with the accompanying drawings so that those skilled in the art can better understand the present invention. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the subject matter of the present invention.
Examples
Fig. 2 is a flowchart of an embodiment of a method for implementing a blockchain gateway according to the present invention. As shown in fig. 1, the specific steps of the method for implementing a blockchain gateway of the present invention include:
s201: intelligent contract operation:
the intelligent contract deployment personnel perform management operation on the intelligent contract according to actual needs, various management operation events are commonly stored on a block chain, the management operation of the intelligent contract comprises intelligent contract deployment, starting, stopping, multiplexing and updating, wherein in the intelligent contract deployment process, all method information contained in the intelligent contract is analyzed, the method information comprises a method name, a method return value, a method parameter name and a type, and the method information forms intelligent contract description information and is commonly stored on the block chain after being integrated into a specified format (such as JSON). Usually, intelligent contract parsing is to use SDK (Software Development Kit) or a node-side contract parsing module to parse in an intelligent contract compiling process or to directly and statically parse.
S202: block chain node event subscription:
the intelligent contract management module is arranged in the block chain node and used for managing operation events of the intelligent contract, and meanwhile, the intelligent contract management module provides an event subscription service for the outside and is used for pushing corresponding notification information to a subscriber after the operation events of the intelligent contract occur. And the block chain gateway subscribes an event to the intelligent contract management module of each block chain node in the block chain, counts the number of block chain link points which send the event information when the notification information pushed by the block chain link points contains the event information of a certain intelligent contract, and enters step S203 if the state change is effective and otherwise does not perform any operation.
Because the operation events of the intelligent contract include deployment, starting, stopping, multiplexing and updating, and the operation events can be used as the states of the intelligent contract, the intelligent contract management module in the block chain node can set a state machine comprising the states, define the notification information of the corresponding events according to different states, and push the notification information of the corresponding events to the event subscriber when the intelligent contract performs state transition in the state machine.
Fig. 3 is a flow diagram of contract event subscription in the present invention. As shown in fig. 3, the state change of the intelligent contract will be successfully identified, and the intelligent contract management module analyzes the transactions related to intelligent contract management, and distinguishes the event information of deployment, start, stop, reuse, and update according to the specific transaction method. According to the distributed consistency principle of the block chain, the contents of the blocks of all the node drop banks are consistent under normal conditions, so that the ledger block is used as the basis of contract event service.
S203: dynamically adjusting the block chain gateway:
the block chain gateway completes corresponding operation according to the event information of the intelligent contract, and performs dynamic adjustment, wherein the dynamic adjustment comprises the following conditions:
1) After receiving the intelligent contract deployment event information, the block chain gateway automatically constructs a gateway service interface according to the intelligent contract description information, and the specific method comprises the following steps:
for each method contained in the intelligent contract, determining the name of a gateway service interface corresponding to the calling of the method according to the name of the method, automatically generating a service interface instance matched with the transaction request parameter of the method according to the name and the type of the method parameter, and automatically analyzing the transaction request parameter calling the method into a link transaction request calling the intelligent contract.
Fig. 4 is an exemplary diagram of constructing a gateway service interface in the present embodiment. As shown in fig. 4, in this embodiment, the method definition of the intelligent contract is recorded through JSON, and the block chain gateway provides a corresponding HTTP access interface through dynamic analysis of this information. The URL prefix of the access interface can be specified through configuration change, a contract name and a method name can be used as an automatic grouping rule by default, and the blockchain gateway can automatically determine the method type converted into the HTTP through the method name of the intelligent contract, wherein the method with the name with the Update prefix is converted into the PUT method of the HTTP; the method with the Remove prefix on the name is converted into a DELETE method of HTTP; the method of the name containing the Get prefix or the unbound pointer type receiver is converted into a GET method of the HTTP; other default methods are to POST to HTTP. Because the name and type of the method parameter are given, the blockchain gateway automatically analyzes the transaction request parameter according to the parameter definition of each method, constructs the uplink transaction, and automatically completes the call operation on the chain.
2) And when receiving the intelligent contract starting or multiplexing event information, the block chain gateway enables a service interface corresponding to the intelligent contract.
3) After receiving the intelligent contract deactivation event, the blockchain gateway changes the interface state of the intelligent contract calling service into unavailable state, namely, closes the calling service of the intelligent contract, redirects the request path of the related service to a contract deactivation dedicated path, and prompts the current state of the intelligent contract to the outside. Thus, if the external calling blockchain gateway is used for the service-related interface, a message that the service is unavailable and the internal contract is disabled is received.
4) And after receiving the intelligent contract updating event, the block chain gateway acquires the updated intelligent contract information, judges whether the service interface of the intelligent contract needs to be updated according to the updated intelligent contract information, does not perform any operation if the service interface of the intelligent contract needs to be updated, and automatically regenerates the intelligent contract to call the service related interface if the service interface needs to be updated.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.
Claims (3)
1. A method for implementing a blockchain gateway is characterized by comprising the following steps:
s1: the intelligent contract deployment method comprises the following steps that an intelligent contract deployment worker performs management operation on an intelligent contract according to actual needs, all management operation events are commonly stored on a block chain, the management operation of the intelligent contract comprises intelligent contract deployment, starting, stopping, multiplexing and updating, in the intelligent contract deployment process, all method information contained in the intelligent contract is analyzed and comprises method names, method return values, method parameter names and types, and the method information forms intelligent contract description information and is commonly stored on the block chain after being integrated into a specified format;
s2: setting an intelligent contract management module in a block chain node, wherein the intelligent contract management module is used for managing operation events of intelligent contracts, and simultaneously providing an event subscription service for a subscriber to push corresponding notification information to the subscriber after the operation events of the intelligent contracts occur; the block chain gateway subscribes an event to an intelligent contract management module of each block chain node in a block chain, when notification information pushed by the block chain link points contains event information of a certain intelligent contract, the number of the block chain link points sending the event information is counted, if the number exceeds a preset threshold value, state change is effective, the step S3 is carried out, and otherwise, no operation is carried out;
s3: the block chain gateway completes corresponding operation according to the event information of the intelligent contract, and performs dynamic adjustment, wherein the dynamic adjustment comprises the following conditions:
1) After receiving the intelligent contract deployment event information, the block chain gateway automatically constructs a gateway service interface according to the intelligent contract description information, and the specific method comprises the following steps:
for each method contained in the intelligent contract, determining a gateway service interface name corresponding to the calling of the method according to the method name, automatically generating a service interface instance matched with the transaction request parameter of the method according to the method parameter name and type, and automatically analyzing the transaction request parameter calling the method into a linked transaction request calling the intelligent contract;
2) When receiving the intelligent contract starting or multiplexing event information, the block chain gateway starts a service interface corresponding to the intelligent contract;
3) After receiving the intelligent contract deactivation event, the block chain gateway changes the interface state of the intelligent contract calling service into unavailable state, namely closes the calling service of the intelligent contract, redirects the request path of the related service to a contract deactivation special path, and prompts the current state of the intelligent contract to the outside;
4) And after receiving the intelligent contract updating event, the block chain gateway acquires the updated intelligent contract information, judges whether the service interface of the intelligent contract needs to be updated according to the updated intelligent contract information, does not perform any operation if the service interface of the intelligent contract does not need to be updated, and automatically regenerates the intelligent contract to call the service related interface if the service interface needs to be updated.
2. The method for implementing a blockchain gateway according to claim 1, wherein the intelligent contract parsing in step S1 employs an SDK or a contract parsing module at a node end to parse or directly and statically parse in an intelligent contract compiling process.
3. The method for implementing a blockchain gateway according to claim 1, wherein the intelligent contract management module in step S2 manages the operation event of the intelligent contract by using a state machine, and the specific method is as follows: the operation event of the intelligent contract is used as the state of the intelligent contract, the intelligent contract management module sets a state machine comprising the states, notification information corresponding to the event is defined according to different states, and when the state of the intelligent contract is transferred in the state machine, the notification information corresponding to the event is pushed to an event subscriber.
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