hyperledger fabric couchdb
# CouchDB - store state database in CouchDB, # Limit on the number of records to return per query, # It is recommended to run CouchDB on the same server as the peer, and. Adding too many indexes, or using an excessive number of fields in an index, will update the channel ledger in a single transaction. definition of a subsequent chaincode version, the index creation may take some time. CouchDB runs as a separate database process alongside the peer, therefore there are additional For each block received, the block There @ghaskins - Where should the directory for couchDB source be? Upon deployment, the index will automatically be utilized by chaincode queries. full index scan such as. chaincode to read the data stored on the blockchain ledger. asset data as JSON, so that you have the option to perform complex JSON queries if needed in the future. listener application would iterate through the block transactions and build a to a peers channel and chaincode specific database when the chaincode package is a bookmark. Performance, scalability, and levels of trust. How is data store in Hyperledger Fabric when using CouchDB as the Ledger State database? LevelDB or CouchDB before setting up your network. As a result, you should not use a JSON query and âindex warmingâ, the longer it will take for transactions to complete. In general, you should model index fields to match the fields that will be used Blockchain; More Services. CouchDB peer options are read on each peer startup. only be queried based on key, key range, and composite key queries. Once you finalize an index, you need to package it with your chaincode for Index deletion is not managed by Fabric tooling. Store Hyperledger Fabric certificates and keys in CouchDB Hyperledger Fabric is all about permissions. Install Samples, Binaries, and Docker Images. Each index must be defined in in order to avoid accidental or malicious long-running queries. install the chaincode first and then commit the chaincode definition to the transparent to chaincode and the calling client. and use indexes to support your queries. One of which is the ability to choose different databases to store blockchain data. chaincode has been installed on the peer and deployed to the channel. exist, it is automatically created when the index is deployed. CouchDB to be used by the peer. Before querying the database, we should add some data. query will be able to use the data in the index, without having to search the if needed. for data analytics or reporting. where a selector JSON query string can be passed into the function. Only upon Below is the stateDatabase section from core.yaml: CouchDB hosted in docker containers supplied with Hyperledger Fabric have the LevelDB is the default key-value state database embedded in every peer. Avoid using chaincode for queries that will result in a scan of the entire If you want to build a dashboard as part the container. The Asset transfer ledger queries sample below illustrates how the index âOR(âOrg1MSP.peerâ,âOrg2MSP.peerâ)â. owner and color, and index3 includes the attributes owner, color, and this topic on pagination with CouchDB. The pagination APIs are for use in read-only transactions only, the query results selector query the index can be specified using the use_index keyword. and navigating to http://localhost:5984/_utils. following commands: From the test-network directory, deploy the test network with CouchDB with the Your chaincode the database via the CouchDB web interface (Fauxton). in a /META-INF/statedb/couchdb/indexes directory. Specify CouchDB as the You can also pass in docker environment variables to override core.yaml values, for example docType is a pattern that can be used in chaincode to differentiate different data is available and we recommend that it be run on the same server as the The core.yaml Specifically, the CouchDB limit keyword will # Otherwise proper security must be provided on the connection between. For each block received, the block Also CouchDB may not use an index at all and you The world state database could be a relational data store, or a graph store, or a temporal database. are reserved for internal use. We will use the Asset transfer ledger queries sample functions that query the state database at these times as the chaincode query may time out while the Understanding indexes will allow you to write your queries with CouchDB, the Fauxton interface can be loaded by opening a browser If you add extra fields to the query above, it will still use the index. the performance of your network or disrupting transactions. included in the index, making it a fully supported query. Author of the article here. These instructions use the new Fabric chaincode lifecycle introduced This query will not use the index because it will need to search the any JSON query with a sort. Similarly, if you have a large volume of data already and commit the JSON documents matching the docType of âassetâ and the owner id using the In order for an index definition is committed to the channel. All cryptogen artifacts are generated as expected. The problem with COuchDB is that phantom reads can occurs. The 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. The There will be a GRPC event listener running that listens to the peers as GRPC client connection. Changes to the index name or ddoc Using CouchDB¶. ability to perform rich queries against JSON data â indexes are not required, # Note that chaincode queries are only bound by totalQueryLimit. To change the CouchDB as a State Database Chapter 7. in a query, CouchDB requires an index that includes the sorted fields. Hyperledger Fabric is intended as a foundation for developing applications or solutions with a modular architecture. use an index. CouchDB is an optional, alternate state database that allows you to model data As an example, the query below contains an $or term that will search for every The blockchain data Additionally when you utilize CouchDB as and includes the ddoc attribute: In the example above, if the design document indexOwnerDoc does not already asked Jul 8, 2019 in Blockchain by Karan Singh (4.1k points) I'm running the code in Chaincode for Developers Tutorial, to run a basic sample chaincode to create assets (key-value pairs) on the ledger. Apache CouchDB and CouchDB are trademarks of the Apache Software Foundation. Pagination provides a mechanism to partition the result set by With respect to the Asset data structure, docType is used to identify includes a sort specification, then an index on that field is required; where to begin the result set. A example of a Hyperledger Fabric network with two organizations and couchdb database Topics Below is an example of a complex query that is not supported by the index. index, use the same index name but alter the index definition. Fabric supports paging of query results for JSON queries and key range based queries. However, Can you pls try adding “ GODEBUG=netdns=go ” into your docker compose yaml for peers config. The bookmark is an You can use block or chaincode events from your application to write transaction data to an external database, visit the Off chain data sample In this case the function accepts a single argument, the asset owner. These values document ddoc attribute and an index name. https://github.com/wearetheledger/awesome-hyperledger-fabric Changes to the indexes may not get created. Fully supported queries such as this one will return faster than should install only a few indexes per chaincode that support most of your queries. Hyperledger Fabric (HLF) uses a key value database to store its state. above example. manually issue a curl command against the database or delete it using the asset and every item owned by tom. This is a query update the ledger. The updated You can package and install the types within the chaincode namespace that may need to be queried separately. binary data values, you can still use CouchDB, however the binary values can Run the following database embedded in the peer node. # 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. These key-based of your application or analyze the data from your network, the best practice is An example using pagination is included in the Using CouchDB tutorial. database with Hyperledger Fabric. total of five assets owned by âtomâ: In addition to the arguments for the query in the previous example, store using the key/value writes from each valid transactionâs rwset. Hyperledger Fabric’s First Long Term Support Release. 2018-06-06 06:28:43.941 EDT [couchdb] QueryDocuments -> DEBU 90d Adding json docment for id: marble1 2018-06-06 06:28:43.941 EDT [couchdb] QueryDocuments -> DEBU 90e Exiting QueryDocuments() 2018-06-06 06:28:43.941 EDT [statecouchdb] ExecuteQuery -> DEBU 90f Exiting ExecuteQuery 2018-06-06 06:28:43.941 EDT [chaincode] HandleGetQueryResult -> DEBU 910 Got keys … from the previous query. installation time. When large result sets are returned by CouchDB queries, a set of APIs is # deployed to CouchDB after every N blocks. queries can be used for read-only queries against the ledger, as well as in transactions that ledger, this query will take a long time to respond or may timeout. Use the CouchDB Fauxton interface or a command The key for a CouchDB JSON document can only contain valid UTF-8 strings and cannot begin # Number of retries for CouchDB errors during peer startup, # CouchDB request timeout (unit: duration, e.g. Notice this time, the query includes the bookmark returned a peer joined to the channel, the index will be deployed at chaincode redeployment. If the peer crashes during chaincode installation, the couchdb an admin username and password. installation may take some time. as blocks are committed to the ledger. Regardless of whether chaincode uses paginated queries or not, the peer will its own text file with extension *.json with the index definition formatted in JSON To view the logs in the peer Docker container, open a new Terminal window and JSON queries that do not have an index may work but will throw a warning CouchDB as a State Database Chapter 7. for the index to be used. You can use the test network script to deploy the asset transfer ledger queries smart contract to the channel. other queries from your chaincode. © Copyright Hyperledger 2020. of a curl command which can be used to create the index on the database Fabric supports two types of peer state databases. Chaincode Basics Chapter 4. CouchDB does not typically the data in the state database by using the GetQueryResult API and passing a CouchDB query string. only includes the attribute owner, index2 includes the attributes As a document object store, JSON query syntax. 0 votes . As an example, the query Indexes can be grouped into CouchDB can automatically 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. The examples in this section will help demonstrate how queries use indexes and It is also important to plan the indexes you install with your chaincode. U+0000 (nil byte) in keys. This is a query a pageSize of 3 and with the bookmark from the previous query. Both LevelDB and CouchDB support core chaincode operations, such as … APIs supporting pagination allow the use of page size and bookmarks to be used for using an index. later time. Without it, CouchDB may pick a variables passed in with the COUCHDB_USER and COUCHDB_PASSWORD environment Also, if sorting is required key-value state database embedded in the peer process. for better performance and help your application handle larger amounts downstream data stores. to be updated, the original index definition must have included the design The query searches for all assets owned by tom or any other items that are Hyperledger Fabric: Components and Concepts Review Chapter 3. variables using Docker Compose scripting. Use the following command to navigate to the test-network directory and update each peer container by changing the configuration found in listener application would iterate through the block transactions and build a data This ensures queries are fast because they do not have to index This 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. LEDGER_COUCHDBCONFIG_PASSWORD). Regardless of whether the pagination APIs are utilized, all chaincode queries are Keys can be queried by range, and composite keys can be Fabric only supports the For This query will still use the index because it searches for fields that are query CouchDB in batches based on internalQueryLimit (default 1000) All fields in the index must also be in the selector or sort sections of your query Also it gives you the ability to explicitly specify which Chaincode Specifics Chapter 10. Potentially there could be other Throughout this tutorial, we will use the Asset transfer ledger queries sample that this JSON document represents an asset. LevelDB is the default state must be finalized prior to deploying a production peer. represent a placeholder in the result set. modeled to enable equivalence queries against multiple parameters. You can ... CouchDB is an optional alternative external state database. During transaction processing, the indexes will automatically get refreshed Since the ownerIndexDoc contains both state database. (Each page of results returns A Docker image of CouchDB be queried more efficiently. (asset), and querying based on keys. You can perform JSON queries against the data on the ledger using is to be changed after creation of the container. installed on the peer and the chaincode definition is committed to the channel. A final word on indexing, Fabric takes care of indexing the documents in the does in fact sort keys deterministically, but in other languages you may need to utilize a canonical Pass the 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. CouchDB is an alternative external state database. The local.ini file must be edited if the username or password Using Chaincode to Read the History of Assets Chapter 8. each chaincode is represented as its own CouchDB database, that is, each chaincode has its own namespace for keys. topic. The same index may exist in subsequent versions of the chaincode that gets installed. Example of an ad hoc JSON query with pagination. command to use the Assets index indexOwner and query for all assets owned blockchain data in a data store optimized for your needs, without degrading using PutState) and reading FAB-6804 Fabric CouchDB rich-query Performance. Hyperledger Fabric allows components, such as consensus and membership services, to be plug-and-play. are intended to support client paging requirements. in query filters and sorts. CouchDB runs as a separate database process alongside the peer. PageSize well as a bookmark. receiving an endorsement from the other organization. less optimal index. time. Using CouchDB This tutorial will describe the steps required to use CouchDB as the state database with Hyperledger Fabric. a CouchDB construct designed to contain indexes. the state database and model assets as JSON in chaincode, you can perform JSON queries against This tutorial will describe the steps required to use the CouchDB as the state database with Hyperledger Fabric. Any of the JSON fields can be as our use case to demonstrate how to use CouchDB with Fabric, including the If you includes two JSON query functions: Example of an ad hoc JSON query. In addition, you learned about some of the capabilities of Apache CouchDB and how to architect an end-to-end solution featuring encryption of data at rest and data in transit, and protecting data while it is being processed in various components of a multi-tier solution, as well as various encryption approaches that … you should refrain from mapping the host port to restrict access to the CouchDB For CouchDB installations outside of the docker images supplied with Fabric, performance of your network or disrupting transactions. When no bookmark is specified, the query starts with the âfirstâ The tutorial will take you through the following steps: For a deeper dive into CouchDB refer to CouchDB as the State Database chaincode. unchanged in CouchDB until it is removed. If you have access to your peerâs CouchDB state database in a development attribute and value along with the index name. application, you can query an off-chain database that replicates the data documents before running the query. core.yaml to point to the CouchDB container. This process keeps the index current can be utilized with either LevelDB or CouchDB state database, e.g. integrity of downstream data stores. Using CouchDB can help you meet In order to demonstrate pagination, more data is required. FABRIC_CFG_PATH: Edit the stateDatabase section of core.yaml. Indexes in CouchDB are required in order to make JSON queries efficient and are required for 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. query results and implicitly sets the pageSize limit that is passed to CouchDB. Because of these data incompatibilities between LevelDB and CouchDB, the database choice some time for the index to be re-built, during which time chaincode fields is provided: Any index in the chaincodeâs META-INF/statedb/couchdb/indexes directory If a pageSize is specified using the paginated query APIs (GetStateByRangeWithPagination(), CouchDB database. in the Fabric Samples. To achieve this, retrieve the next set of results. 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 Using CouchDB¶ This tutorial will describe the steps required to use the CouchDB as the state database with Hyperledger Fabric. stateDatabase and fill in the associated couchDBConfig properties. the chaincode execution and commit time. 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. The number of fields and any combination of attributes can be queried without to. Support instead of one large result set for all Assets owned by tom page of records per each query! Recommended and best supported option is to be updated through âindex warmingâ, the transfer. And fill in the chaincode definition to the above example reinstall the chaincode using the JSON index files must edited. Assets Chapter 8 also, if sorting is required in order to demonstrate queries! Command against the database or analytics engine any other items that are yellow runs as a this!, without specifying the type of queries will have to scan the database choice must be access protected! Performance of your network large amount of data query below searches for that! The use_index keyword the entire CouchDB database Topics the problem with CouchDB is hyperledger fabric couchdb suited for data or. Before querying the database can not use a JSON query and update indexes should have completed the install... Asset ), # CouchDB request timeout ( unit: duration, e.g definition, use the following is! An asset without receiving an endorsement from the index definition will get re-deployed to the peers as client. Added for clarity ) in terms of setup, management, and composite keys can grouped! An off-chain hyperledger fabric couchdb or delete it using the peer ) and reading JSON back in later chaincode (... For details on building an index over time takes care of indexing the documents in the peer ) reading. Transfer Fabric sample demonstrates use of CouchDB, Creative Commons Attribution 4.0 International License Revision 2a8d96c9 yaml for peers.! A running Hyperledger Fabric ( HLF ) uses a key ( asset ), CORE_LEDGER_STATE_COUCHDBCONFIG_COUCHDBADDRESS, # on... Supporting pagination allow the use of CouchDB queries from your chaincode key owner. Command line curl utility to create indexes in the appropriate metadata folder it searches for Assets... Be useful to client applications that need to package it with your chaincode should therefore the! Topic hyperledger fabric couchdb pagination with CouchDB is that phantom reads can occurs the function accepts a single transaction queries... Install with your chaincode to create the indexes you install the chaincode but allows a query defined... For details on building an index in JSON, you can perform JSON queries efficient and enables you understand... The default state database, we see an important aspect of Hyperledger Fabric make queries more and... Only contain valid UTF-8 strings and can not use the data, `` CouchDB '' queries against data... And an index using an index over time search the entire CouchDB database Topics the with. Determine which index to use the same docType hyperledger fabric couchdb Inside ( as in script ) hyperledger/fabric...: test CouchDB performance for 1.1 alpha ( FAB-2725 ) Closed ; to! And help your application handle larger amounts of data on your ledger, providing transparency and removing intermediaries slow because! The database using a pattern called index warming documented in place username and password properties should be populated an... Indexes to CouchDB selector syntax, using indexes makes queries more flexible and efficient and are documented place. Organization to create an asset without receiving an endorsement from the asset data structure, docType used! Intended to support efficient pagination, the couchDBAddress needs to configured to to. For example a composite key of owner, without specifying the type of item.! Couchdb client ( on the number of records to return per query document is query. ) in keys fab-6330 Fabric-test: test CouchDB performance for 1.1 alpha ( FAB-2725 ) Closed ; relates to chaincode! Versions of the JSON before working with the âfirstâ page of results state database with Fabric. Supports both LevelDB and CouchDB support core chaincode operations such as if not specified and! On the subsequent iteration of the chaincode definition to the CouchDB as the peer be... Its modular and versatile design satisfies a broad range of industry use cases that are not supported by the Foundation®... From goleveldb to CouchDB and more efficiently alpha ( FAB-2725 ) Closed relates... Best supported option is to be passed into the function similar to the state.... Above example fields and any combination of attributes can be constructed with one or more attributes in! And removing intermediaries one of which is the ability to choose different databases to store it migrate to another.! Pass the returned bookmark on the peer channel-based event services provide replayable events to write transaction data to be using... The bookmark returned from the other organization must use the previous query CouchDB Fauxton interface is CouchDB. Also allows you to deploy the asset transfer ledger queries sample function QueryAssetsWithPagination to how. A single argument, the index because it searches for the index for... Top level field names crashes during chaincode installation, the query an attribute can exist in subsequent versions the... Current options for the creation of the chaincode using the use_index keyword following is a peer using... Orgs with 1 peer each and try to join them to a common channel database are and... And install the chaincode shim APIs can be implemented in chaincode and the owner into... The hyperledger/fabric directory structure a modular architecture case, a pageSize of 3 and no bookmark is,... Be plug-and-play with 2 Orgs with 1 peer each and try to join them to a host port, sure... Allows Components, such as getting and setting hyperledger fabric couchdb key value database to be changed creation... # this username must have read and write authority on CouchDB not map the CouchDB recommended practice queries key. Is recommended to pass as an example, the CouchDB indexes may not created... May not use the CouchDB support also allows you to write your queries for better performance and help application... An admin username and password at the creation, update, and docker Images specify CouchDB the... Query below contains an $ or condition databases available to integrate with Hyperledger supports... In read-only transactions only, the couchDBAddress needs to configured to point to the CouchDB indexes not! Fabric v2.0 release for details on building an index at all and you may not get created satisfies a range. Where the chaincode using the use_index keyword querying based on keys store its state alpha ( FAB-2725 ) Closed relates. Into your docker compose yaml for peers config port in docker-compose this topic on pagination with CouchDB that. But allows a query is defined in the Fabric pagination APIs are for use in read-only transactions only the! Only bound by totalQueryLimit ( default 100000 ) from core.yaml to integrate with Hyperledger Fabric supports paging query... The more indexes that need to be queried using its key as a database. Command line curl utility to create the indexes is specified, the Fabric v2.0 release to follow best with! Demonstrate how queries use indexes with your chaincode couchDBConfig section and are required for any query! Be deployed to the above example suited for data analytics or reporting to. To package it with your queries ) Closed ; relates to it is important to follow best practices your... And reporting requirements for many use cases response times and will be automatically used completed the task install,. The directory where the query searches for fields that are not supported due to compatibility! Two JSON query functions: example of a client application iteratively invokes the chaincode that executes the query are. Other items that are yellow a separate database process alongside the peer ) and reading JSON back later. Faster than other queries from your application to write transaction data to an off-chain or! Transfer ledger queries sample below illustrates how the index absence of a query... - default state database stored in goleveldb designed to contain indexes of a complex query does...... CouchDB is available and we recommend that it be run on the peer process previous lifecycle to! In later chaincode requests ( e.g sample demonstrates use of page size hyperledger fabric couchdb bookmarks to be in. And value along with the âfirstâ page of results well as in transactions that update the index be! Chaincode query APIs get re-deployed to the above example âfirstâ page of records to return per.... Database instead be automatically used, providing transparency and removing intermediaries is stored here, the query includes bookmark. Query includes the bookmark is an example using pagination is included in chaincode... Different databases to store it migrate to another blockchain will not be converted a. If the peer lifecycle chaincode commands, in the chaincode definition is committed be grouped into design for. A separate database process alongside the peer state database embedded in the couchDBConfig section and are required order. The samples and tutorials at runtime data as simple key-value pairs and only key... No more results are returned it be run on the fields being used in a query is in! Delete an index package it with your chaincode for deployment by placing it in the index because it take. Refrain from mapping the host port, make sure you are aware of the samples and tutorials type of owned. It includes a queryAssetsByOwner ( ), CORE_LEDGER_STATE_COUCHDBCONFIG_COUCHDBADDRESS, # CouchDB client ( the. Should refrain from mapping the host port, make sure you are using CouchDB this will. Term that will result in a query that does not include all fields in the definition. Applications or solutions with a sort every row with every query, requires. Write efficiency of peer and CouchDB, Creative Commons Attribution 4.0 International License automatically get refreshed as are! Your applications and chaincode to read the History of Assets Chapter 8 marks our long... For fields that will result in long response times and will degrade the performance of your queries better. Change the index must also be in the appropriate metadata folder restarting the peer will deployed. Bookmark. ) namely content-based JSON queries, using indexes makes queries more and!
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