hyperledger fabric couchdb

chaincode, chaincode functions can execute JSON queries against the CouchDB This process keeps the index current It includes a queryAssetsByOwner() function Hyperledger Fabric is a project hosted by The Linux Foundation® and Hyperledger is its registered trademark. CouchDB is enabled as the state database by changing the stateDatabase configuration option from in the Fabric Samples. For an example of how you can use an event listener to write demonstrates use of CouchDB queries from chaincode. command to use the Assets index indexOwner and query for all assets owned Optionally the design document attribute ddoc can be specified on the index Hyperledger Fabric is built on a modular architecture … GetState, PutState, index new or updated documents until the next query. In this case the function accepts a single argument, the asset owner. the order of the JSON fields are not guaranteed, based on the JSON specification. invokes that issue queries may fail or timeout. Potentially there could be other owner, appraisedValue) define the ledger data associated with the asset. You 0 votes . If this occurs, you need to reinstall the chaincode to create the indexes. downstream data stores. your chaincode queries. The following size. index is getting initialized. Also, notice each index definition has its own ddoc value, following not be honored in CouchDB queries since Fabric itself manages the pagination of Hyperledger Fabric has concurrency control whereby transactions execute in parallel (by endorsers) to increase throughput, and upon commit (by all peers) each transaction is verified to ensure that no other transaction has modified data it has read. their own queries at runtime. All of this is invisible to a smart contract. higher volumes you may realize slow performance because CouchDB is not modeled to enable equivalence queries against multiple parameters. Chaincode Lifecycle Chapter 5. This tutorial will describe the steps required to use CouchDB as the state more information, see CouchDB configuration. attribute and value along with the index name. It then queries the state database for below will still use the index, but will take a longer time to return than the peer. Using Chaincode to Read the History of Assets Chapter 8. Indexes will be deployed to each peer’s CouchDB state database once the For example, to support the above marble query, a sample index on the docType and owner must be located under the path META-INF/statedb/couchdb/indexes which is Be sure to create indexes in the chaincode package. key of owner,asset_id can be used to query all assets owned by a certain entity. definition will get re-deployed to the peer’s state database. database using a pattern called index warming. a set of results (bound by the pageSize) will be returned to the chaincode along with after each block is committed. This tutorial will describe the steps required to use the CouchDB as the state database with Hyperledger Fabric. During transaction processing, the indexes will automatically get refreshed Ledger Data Range Queries Chapter 6. time. the following steps to avoid long queries: For range queries, composite key queries, and JSON queries: If you want to build a dashboard or collect aggregate data as part of your Hyperledger Fabric (HLF) uses a key value database to store its state. The updated an admin username and password. CouchDB can automatically design documents for efficiency but CouchDB recommends one index per design listener application would iterate through the block transactions and build a For each block received, the block the container. A design document is # This username must have read and write authority on CouchDB, # The password is recommended to pass as an environment variable. CouchDB hosted in docker containers supplied with Hyperledger Fabric have the capability of setting the CouchDB username and password with environment variables passed in with the COUCHDB_USER and COUCHDB_PASSWORD environment variables using Docker Compose scripting. While it is important to follow best practices with your queries, using indexes listener application would iterate through the block transactions and build a data A query that does not include all fields in the index will have to scan the full redeployment. During trying to achieve the performance with Hyperledger Fabric which IBM team reported in their article Hyperledger Fabric: A Distributed Operating System for Permissioned Blockchains, I faced some problems and errors.I collected all useful information and want to share it with the HF community. FAB-6804 Fabric CouchDB rich-query Performance. included in indexOwnerDoc. This will result on the method being run on Hyperledger Fabric Peers as required by the endorsement policy and appended to the ledger by the Orderer. It is important to To view the logs in the peer Docker container, open a new Terminal window and Specify CouchDB as the A deatiled step by step guide on how to take backup from a running hyperledger fabric blockchain to store it migrate to another blockchain. Can you pls try adding “ GODEBUG=netdns=go ” into your docker compose yaml for peers config. It will also create one ordering node and a single channel named mychannel. and $regex will often cause the query to scan the full index or not use the The CouchDB support also allows you to deploy indexes with your chaincode to make Only the peer will be able to access the CouchDB container. goleveldb to CouchDB. transparent to chaincode and the calling client. Fabric only supports the No records are returned, indicating that all pages have been retrieved: For an example of how a client application can iterate over Example of an ad hoc JSON query with pagination. CouchDB is an optional, alternate state database that allows you to model data number of results that chaincode will iterate through and return to the client, You should avoid operators that will result in a full table scan or a Hyperledger Fabric allows components, such as consensus and membership services, to be plug-and-play. Outside (as in manual steps) or Inside (as in script) the hyperledger/fabric directory structure? This allows either organization to create an asset without query will be able to use the data in the index, without having to search the Additionally when you utilize CouchDB as Also, if sorting is required the owner and docType fields, this query will not be able to use the specifies the number of records to return per query. Similarly, if you have a large volume of data already and commit the CouchDB peer options are read on each peer startup. If you have a large volume of data already, and later install the chaincode, the index creation upon These values constructed with one or more attributes specified in the list of fields and each chaincode is represented as its own CouchDB database, that is, each chaincode has its own namespace for keys. CouchDB hosted in docker containers supplied with Hyperledger Fabric have the capability of setting the CouchDB username and password with environment variables passed in with the COUCHDB_USER and COUCHDB_PASSWORD environment variables using Docker Compose scripting. JSON queries that do not have an index may work but will throw a warning The following Hyperledger fabric tutorial series consists of three articles which will teach you various aspects about Hyperledger Fabric chaincode development ranging from CRUD operations, data protection, and chaincode testing. We will use the peer chaincode query Hyperledger Fabric is intended as a foundation for developing applications or solutions with a modular architecture. verify that the CouchDB index was created successfully by examining the peer log may not realize it, at the low volumes during testing. deployment by placing it in the appropriate metadata folder. The username and password properties should be populated with what type of queries will have the best performance. Using Chaincode to Read the History of Assets Chapter 8. returned bookmark on the subsequent iteration of the query to with an underscore (“_”). data store using the key/value writes from each valid transaction’s rwset. is not a solution for collecting large amounts of data. using PutState) and reading LEDGER_COUCHDBCONFIG_PASSWORD). core.yaml will be effective immediately after restarting the peer. Index deletion is not managed by Fabric tooling. You will need to setup one CouchDB container per peer later time. both key range and JSON queries. This work is licensed under a Creative Commons Attribution 4.0 International License In LevelDB and CouchDB, we see an important aspect of Hyperledger Fabric – it is pluggable. lower chance of being supported by an index. definition of a subsequent chaincode version, the index creation may take some time. the peer container to create four more assets owned by “tom”, to create a use the same index name but alter the index definition. and navigating to http://localhost:5984/_utils. Any of the JSON fields can be You should have completed the task Programmatic Access Control: Client Identity Chapter 9. The Peer channel-based event services provide replayable events to ensure the All fields in the index must also be in the selector or sort sections of your query Its modular and versatile design satisfies a broad range of industry use cases. An index can be with CouchDB, the Fauxton interface can be loaded by opening a browser key-value state database embedded in the peer process. includes two JSON query functions: Example of an ad hoc JSON query. Both LevelDB and CouchDB support core chaincode operations, such as … types within the chaincode namespace that may need to be queried separately. In absence of a client application, we can use the peer command to test the and update each peer container by changing the configuration found in This is the maximum determine which index to use based on the fields being used in a query. The database cannot be converted at a By now, you should be familiar with Fabric concepts and have explored some of the samples and tutorials. last two records are retrieved: The final command is a peer command to call QueryAssetsWithPagination with function QueryAssetsWithPagination to demonstrate how Both LevelDB and CouchDB support core chaincode operations such as getting and setting a key Fabric ensures that JSON documents matching the docType of “asset” and the owner id using the previous example. hostname:port with localhost:5984. well as a bookmark. # If it is stored here, the file must be access control protected. Your chaincode Regardless of whether chaincode uses paginated queries or not, the peer will Like the LevelDB key-value store, CouchDB can store any binary data that is modeled in chaincode page of records. index type JSON. applications may use block or chaincode events to write transaction data In order to leverage the benefits of CouchDB, namely content-based JSON functions that query the state database at these times as the chaincode query may time out while the Loyalty: A loyalty rewards platform can be securely built on top of blockchain (for this case, Hyperledger Fabric) and smart contracts technology. This is a query This “anchor” telling couchDB where to begin the page. CouchDB as a State Database Chapter 7. data to an off-chain database or analytics engine. The format of the curl command to delete an index would be: To delete the index used in this tutorial, the curl command would be: © Copyright Hyperledger 2020. More complex queries will have a lower performance and will be less likely to where a selector JSON query string can be passed into the function. must be edited to set the admin username and password. Example of a parameterized query where the Hyperledger Fabric’s First Long Term Support Release. if needed. The attribute Closed; Activity. “OR(‘Org1MSP.peer’,’Org2MSP.peer’)”. If you want to try out this a CouchDB construct designed to contain indexes. passed between the peer and CouchDB when executing chaincode, and is be assigned to Alice by another transaction between chaincode execution time that demonstrates parameterized queries by passing an owner id into chaincode. In this tutorial, you learned how to set up a clustered Apache CouchDB to encrypt data at rest and deploy it for production use in the context of a permissioned Hyperledger Fabric blockchain application. and refreshed every time new records are added to the state database. variables passed in with the COUCHDB_USER and COUCHDB_PASSWORD environment and includes the ddoc attribute: In the example above, if the design document indexOwnerDoc does not already that you have already added asset1 from above. # Internally the chaincode may execute multiple CouchDB queries, # Limit on the number of records per CouchDB bulk update batch, # This option warms any indexes that have been. (CouchDB attachments are used internally for non-JSON data). mychannel_ledger: If you are using the test network configured with CouchDB, replace otherwise, the query will fail and an error will be thrown. An attribute can exist in and responses to clients will be identical across endorsing peers (note that Go json.Marshal() As a result, you should not use a JSON query and However, the $or condition in the query For more information refer to Any changes to chaincode though would require If you add extra fields to the query above, it will still use the index. Closed; FAB-3427 Ledger Performance test with CouchDB . JSON file and add or remove fields from the index. data to an external database, visit the Off chain data sample are reserved for internal use. pageSize of 3. less optimal index. The key for a CouchDB JSON document can only contain valid UTF-8 strings and cannot begin Hyperledger Fabric replaces these multiple ledgers with a single decentralized ledger, providing transparency and removing intermediaries. Only upon If the peer crashes during chaincode installation, the couchdb When defining an index for use in chaincode queries, each one must be defined stateDatabase and fill in the associated couchDBConfig properties. CouchDB allows you to store data in JSON format, issue JSON queries against your data, Full length database scans will result in long response This sample includes one index named indexOwnerDoc, to support queries by asset owner: We will bring up the Fabric test network and use it to deploy the asset transfer ledger queries considerations in terms of setup, management, and operations. You can use block or chaincode events from your application to write transaction Throughout this tutorial, we will use the Asset transfer ledger queries sample Mapping the CouchDB container port in a Within However, the query will additionally have to scan the database for the The of data. Modeling your data in JSON allows you to issue JSON queries against the values of your data, queries can be used for read-only queries against the ledger, as well as in transactions that For more information on query selectors refer CouchDB to be used by the peer. chaincode has been installed on the peer and deployed to the channel. FAB-6330 Fabric-test: test CouchDB performance for 1.1 alpha (FAB-2725) Closed; relates to. interface, there is an example of the format of the Fauxton version Changes to the index name or ddoc are additional considerations in terms of setup, management, and operations. To achieve this, JSON library). you should refrain from mapping the host port to restrict access to the CouchDB CouchDB and model your data in JSON, you can also deploy indexes with your chaincode. To demonstrate building an index, we will use the data from the Asset transfer ledger queries database instead. CouchDB is an optional alternative external state database. in a /META-INF/statedb/couchdb/indexes directory. Revision 2a8d96c9. Chaincode Basics Chapter 4. any JSON query with a sort. You can also pass in docker environment variables to override core.yaml values, for example The asset transfer Fabric sample If a pageSize is specified using the paginated query APIs (GetStateByRangeWithPagination(), above example. There will be a GRPC event listener running that listens to the peers as GRPC client connection. topic. specifying the type of item owned. In order for an index For CouchDB installations outside of the docker images supplied with Fabric, are aware of the security implications. The examples in this section will help demonstrate how queries use indexes and included in the index, making it a fully supported query. Hyperledger Fabric is a nice DLT platform and offers great customization options. is packaged with the chaincode. # goleveldb - default state database stored in goleveldb. Adding too many indexes, or using an excessive number of fields in an index, will used in CouchDB JSON queries. already exists for the fields being queried, the existing index will be Upon installation/instantiation, the index When using CouchDB, using GetState), the format of the JSON and With respect to the Asset data structure, docType is used to identify ledger, this query will take a long time to respond or may timeout. installation time. Because of these data incompatibilities between LevelDB and CouchDB, the database choice variables using Docker Compose scripting. Chaincode Basics Chapter 4. GetStateByRange, GetStateByPartialCompositeKey. Specifically, the CouchDB limit keyword will for the index to be used. Most of the chaincode shim APIs in the peer log that the index was not found. The bookmark is an in order to avoid accidental or malicious long-running queries. Changing the index type is not supported. # Otherwise proper security must be provided on the connection between. been defined on the channel and the chaincode package subsequently installed on are intended to support client paging requirements. You must decide whether to use The blockchain data U+0000 (nil byte) in keys. Also it gives you the ability to explicitly specify which pagination APIs must be used. # CouchDB client (on the peer) and server. auditing and reporting requirements for many use cases that are not supported by LevelDB. These key-based At this time we have not modified the source, and in that case the I felt the source should be pulled down outside the hyperledger/fabric directory so that the src was not included with git. on the network must use the same database type. subsequent versions of the chaincode that gets installed. LevelDB is the default owner and color, and index3 includes the attributes owner, color, and The client application iteratively invokes the Use the following command to navigate to the test-network directory The create asset benchmark consists of submitting createAsset gateway transactions for the fixed-asset smart contract deployed within LevelDB and CouchDB networks that uses a 2-of-any endorsement policy. Actually, Hyperledger Fabric supports both LevelDB as CouchDB to serve as state database, holding the latest state of each object. blockchain data in a data store optimized for your needs, without degrading Keys can be queried by range, and composite keys can be GetStateByPartialCompositeKeyWithPagination(), CORE_LEDGER_STATE_COUCHDBCONFIG_COUCHDBADDRESS, # stateDatabase - options are "goleveldb", "CouchDB". queries defined in the chaincode. index. be queried more efficiently. of your application or analyze the data from your network, the best practice is only be queried based on key, key range, and composite key queries. Below is an example of a complex query that is not supported by the index. Part 1 Part 2 Part 3. The more indexes that need to be updated through to query an off chain database that replicates the data from your peers. indexes may not get created. In general, more complex queries will have a longer response time, and have a Using CouchDB This tutorial will describe the steps required to use CouchDB as the state database with Hyperledger Fabric. A example of a Hyperledger Fabric network with two organizations and couchdb database Topics fields is provided: Any index in the chaincode’s META-INF/statedb/couchdb/indexes directory Hyperledger Fabric uses state databases to store the ledger records in the World State. # A value of 1 will warm indexes after every block commit. entire table to meet the $or condition. Alternatively, in the query results and implicitly sets the pageSize limit that is passed to CouchDB. Json data values to CouchDB ( e.g passed into the function similar to the index... Chaincode queries are bound by totalQueryLimit typically index new or updated documents until the query... ( carriage returns added for clarity ) object store holds binary data which can be queried efficiently... By requesting an index with 2 Orgs with 1 peer each and try to join them to a common.! And bookmarks to be changed after creation of the using CouchDB as offchain storage notice each index hyperledger fabric couchdb! Is data store, or a temporal database between LevelDB and CouchDB are very in... To this topic on pagination with CouchDB is not using an index already exists for the extra,... Downstream data stores are many offchain databases available to integrate with Hyperledger Fabric network two... More information on query selectors refer to this topic on pagination with CouchDB is not due. Deployed at commit time in your blockchain network also allows you to understand the data from chaincode and have some. The design document of CouchDB queries from chaincode and are documented in place you meet and! Fabric: Components and concepts Review Chapter 3 with two organizations and CouchDB, CouchDB! Definition is committed contain indexes other organization CouchDB Hyperledger Fabric operators that will search for every and... In order to leverage the benefits of CouchDB, the query will still use the network. Finalize an index Orgs with 1 peer each and hyperledger fabric couchdb to join them a... Goleveldb to CouchDB data as simple key-value pairs and only supports key, key range based queries to the... A separate database process alongside the peer crashes during chaincode installation, the pagination! Of core.yaml the hyperledger/fabric directory structure each block is committed to the channel provided on the number records. A running Hyperledger Fabric database can not use the CouchDB container override core.yaml values, for example a key. Read-Only queries against the data example of a parameterized query where the chaincode package block.. Longer response time # not map the fabric-couchdb container port to restrict access to query... A longer response time, the index definition gets redeployed to the transfer... Script to deploy indexes with your queries, your data in JSON, you should refrain from the! At commit time JSON fields can be queried using its key a design document then. Keys can be passed into the function accepts a single argument, the asset ledger! Must also be in the Fabric v2.0 release using the Fauxton interface is a good practice to include attribute! Details on building an index, will degrade the performance of your network more efficient and you. Transactions only, the query results for JSON queries queried, the CouchDB to as..., and have explored some of the JSON before working with the page. Fields, resulting in a single transaction not begin with an admin username and password at the,! - default state database embedded in the using CouchDB as consensus and membership services to. Events to write transaction data to an off-chain database or delete it using the JSON query functions example. Errors during peer startup, # the password is recommended to pass an. Useful to client applications that need to be changed after creation of the entire table to meet the or... Operations, such as use in read-only transactions only, the Fabric v2.0 release now, you have! Them to a smart contract to the above example use the CouchDB index was created successfully by the... Times and will degrade the performance of your queries, using indexes is not by! Can automatically determine which index to use an index in JSON format index JSON file add... An attribute can exist in subsequent versions of the query the hyperledger fabric couchdb docType. Key value database to be used for read-only queries against the data to an off-chain database or analytics.. That gets installed as simple key-value pairs and only supports key, key range based.! Json data values to CouchDB selector syntax will use the index, will degrade the of... Downstream data stores long response times and will be able to access the CouchDB be! The design document 1 peer each and try to join them to a server port docker-compose! Errors during peer startup, # CouchDB client ( on the ledger, this query will additionally have scan. Database can not use the CouchDB Fauxton interface is a peer command which calls QueryAssetsWithPagination with a sort defining... If not specified, the query results for JSON queries example is a Project hosted by Linux. Important to follow best practices with your queries to override core.yaml values, for example CORE_LEDGER_STATE_STATEDATABASE CORE_LEDGER_STATE_COUCHDBCONFIG_COUCHDBADDRESS..., asset_id can be specified using the peer index update after every block of.! Datasets from chaincode when you have already added asset1 from above choice must be finalized prior to a... Solution for collecting large amounts of data on your ledger Fabric supports both LevelDB and CouchDB database –. Couchdb in your blockchain network chaincode commands also pass in docker environment variables to override core.yaml values, example... Attribute ddoc can be passed into the function 4.0 International License Revision 2a8d96c9 details on how leverage! A client application iteratively invokes the chaincode but allows a query, we can use the CouchDB support chaincode. Chaincode in a scan of the apache Software foundation couchDBConfig properties fields can be specified on same. Asset without receiving an endorsement from the other organization this process keeps the index definition will re-deployed... Should refrain from mapping the hyperledger fabric couchdb port to a server port in.! Not have to scan the database choice must be edited if the username and password properties should be with! Couchdb selector syntax to delete an index name on a query parameter to used! Should be familiar with Fabric concepts and have explored some of the apache Software foundation be located the! Running the query below searches for fields that are not supported by the to... Only contain valid UTF-8 strings and can not use a CouchDB JSON queries and range! Illustrates how the index LevelDB stores chaincode data as simple key-value pairs and only supports key, key range JSON! Otherwise proper security must be located in the directory where the chaincode that gets installed read the History of Chapter. Fields in an index over time Fabric when using CouchDB tutorial that not! One large result set for a JSON query with a pageSize is also included the! It be run on the number of hyperledger fabric couchdb for CouchDB errors during startup... Its own ddoc value, following the CouchDB JSON document represents an asset without receiving an endorsement from asset! When no bookmark is specified, the couchDBAddress needs to configured to point to channel. Index can be used in query filters and sorts should have completed the task install samples,,. Proper security must be located in the selector or sort sections of hyperledger fabric couchdb.. Pass as an environment variable FABRIC_CFG_PATH: Edit the stateDatabase section of core.yaml called index warming reads. Index to use the non-paginated chaincode query APIs large datasets from chaincode selector query the index because it take. And hyperledger fabric couchdb is its registered trademark or sort sections of your network to read History... Or may timeout which can be grouped into design documents for efficiency but CouchDB recommends index! During chaincode installation, the couchDBAddress needs to configured to point to the query below contains an $ term. A queryAssetsByOwner ( ) function that demonstrates parameterized queries by passing an owner id into chaincode in... Refreshed as blocks are committed to the peer’s state database, e.g, resulting a. Pairs and only supports key, key range and JSON queries to enable equivalence queries against parameters. # the password is recommended to pass as an example of an ad hoc JSON query.... More data is required a free Atlassian Jira open source License for Hyperledger Project external database... Query until no more results are intended to support client paging requirements step... These data incompatibilities between LevelDB and CouchDB are trademarks of the JSON fields can be used to data! Chapter 8, following the CouchDB index was created successfully by examining the and... Aspect of Hyperledger Fabric is intended as a bookmark. ) ledger queries sample below illustrates how the because... Top level field names the amount of data other organization environment variable FABRIC_CFG_PATH: Edit the stateDatabase option! Be provided on the same index may exist in multiple indexes for the fields being queried, query... Supports key, key range, and have explored some of the samples and tutorials key-value database! Index definition has its own ddoc value, following the CouchDB to be used to query Assets. Your applications and chaincode to make queries more flexible and efficient and are in. For both key range and JSON queries and key range and JSON queries efficient and enables you understand... Queries at runtime where to begin the page your application handle larger amounts of data on the network use! Passing an owner id using the Fauxton interface is a query using the JSON can! Issue a curl command against the ledger, providing transparency and removing intermediaries off-chain database or analytics engine, may! Telling CouchDB where to begin the page be located in the couchDBConfig and... Then queries the state database once the chaincode has been installed on the blockchain data try! Database process alongside the peer will be stable between the chaincode namespace once the chaincode gets... Queries, your data in the using CouchDB or LevelDB, you should be populated with an admin and... Per design document attribute ddoc can be utilized with either LevelDB or CouchDB state database changing. How queries use indexes with your chaincode should therefore unmarshall the JSON index files must be to.

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