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[FAB-12026] pagination samples for node marbles02

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This change synchronizes the node marbles02 sample chaincode with
fabric/examples/marbles02

Change-Id: I6c11fee15ae39950fca7344fbf230c42f876274a
Signed-off-by: zhaochy <zhaochy_2015@hotmail.com>
This commit is contained in:
zhaochy 2018-09-21 11:01:36 +08:00 committed by Gari Singh
parent 6dc5ce503b
commit 24c5e47539
1 changed files with 74 additions and 2 deletions
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76
chaincode/marbles02/node/marbles_chaincode.js
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@ -18,10 +18,14 @@
// peer chaincode query -C myc1 -n marbles -c '{"Args":["readMarble","marble1"]}'
// peer chaincode query -C myc1 -n marbles -c '{"Args":["getMarblesByRange","marble1","marble3"]}'
// peer chaincode query -C myc1 -n marbles -c '{"Args":["getHistoryForMarble","marble1"]}'
// peer chaincode query -C myc1 -n marbles -c '{"Args":["getMarblesByRangeWithPagination","marble1","marble3","3",""]}'
// Rich Query (Only supported if CouchDB is used as state database):
// peer chaincode query -C myc1 -n marbles -c '{"Args":["queryMarblesByOwner","tom"]}'
// peer chaincode query -C myc1 -n marbles -c '{"Args":["queryMarbles","{\"selector\":{\"owner\":\"tom\"}}"]}'
// peer chaincode query -C myc1 -n marbles -c '{"Args":["queryMarblesByOwner","tom"]}'
// peer chaincode query -C myc1 -n marbles -c '{"Args":["queryMarbles","{\"selector\":{\"owner\":\"tom\"}}"]}'
// Rich Query with Pagination (Only supported if CouchDB is used as state database):
// peer chaincode query -C myc1 -n marbles -c '{"Args":["queryMarblesWithPagination","{\"selector\":{\"owner\":\"tom\"}}","3",""]}'
'use strict';
const shim = require('fabric-shim');
@ -404,6 +408,74 @@ let Chaincode = class {
return Buffer.from(JSON.stringify(results));
}
// ====== Pagination =========================================================================
// Pagination provides a method to retrieve records with a defined pagesize and
// start point (bookmark). An empty string bookmark defines the first "page" of a query
// result. Paginated queries return a bookmark that can be used in
// the next query to retrieve the next page of results. Paginated queries extend
// rich queries and range queries to include a pagesize and bookmark.
//
// Two examples are provided in this example. The first is getMarblesByRangeWithPagination
// which executes a paginated range query.
// The second example is a paginated query for rich ad-hoc queries.
// =========================================================================================
// ====== Example: Pagination with Range Query ===============================================
// getMarblesByRangeWithPagination performs a range query based on the start & end key,
// page size and a bookmark.
//
// The number of fetched records will be equal to or lesser than the page size.
// Paginated range queries are only valid for read only transactions.
// ===========================================================================================
async getMarblesByRangeWithPagination(stub, args, thisClass) {
if (args.length < 2) {
throw new Error('Incorrect number of arguments. Expecting 2');
}
const startKey = args[0];
const endKey = args[1];
const pageSize = parseInt(args[2], 10);
const bookmark = args[3];
const { iterator, metadata } = await stub.getStateByRangeWithPagination(startKey, endKey, pageSize, bookmark);
const getAllResults = thisClass['getAllResults'];
const results = await getAllResults(iterator, false);
// use RecordsCount and Bookmark to keep consistency with the go sample
results.ResponseMetadata = {
RecordsCount: metadata.fetched_records_count,
Bookmark: metadata.bookmark,
};
return Buffer.from(JSON.stringify(results));
}
// =========================================================================================
// getQueryResultForQueryStringWithPagination executes the passed in query string with
// pagination info. Result set is built and returned as a byte array containing the JSON results.
// =========================================================================================
async queryMarblesWithPagination(stub, args, thisClass) {
// 0
// "queryString"
if (args.length < 3) {
return shim.Error("Incorrect number of arguments. Expecting 3")
}
const queryString = args[0];
const pageSize = parseInt(args[2], 10);
const bookmark = args[3];
const { iterator, metadata } = await stub.GetQueryResultWithPagination(queryString, pageSize, bookmark);
const getAllResults = thisClass['getAllResults'];
const results = await getAllResults(iterator, false);
// use RecordsCount and Bookmark to keep consistency with the go sample
results.ResponseMetadata = {
RecordsCount: metadata.fetched_records_count,
Bookmark: metadata.bookmark,
};
return Buffer.from(JSON.stringify(results));
}
};
shim.start(new Chaincode());