Access the Data Service when Eventing is listening to multiple collections.
The multiCollectionEventing function:
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Demonstrates how to access the Data Service when using
*wildcard bindings -
Requires 2 bindings of type
bucket alias -
Requires the following 4 keyspaces in two buckets,
rr100and source:-
rr100.eventing.metadata -
source._default._default -
source.myscope.mycol1 -
source.myscope.mycol2
-
-
Operates on 3 test documents
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Highlights the use of
meta.keyspace
For more information about the Advanced Self-Recursion Parameter, see Eventing Functions that Listen to Multiple Collections.
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multiCollectionEventing
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Input data
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Output log in reverse order
// Configure the settings for the multiCollectionEventing function as follows:
//
// Set up four (4) required keyspaces in two buckets "rr100" and "source"
// rr100.eventing.metadata
// source._default._default
// source.myscope.mycol1
// source.myscope.mycol2
//
// Version 7.1.1+
// "Function Scope"
// *.* (or try source.* if non-privileged)
// "Listen to Location"
// source.*.*
// "Eventing Storage"
// rr100.eventing.metadata
// Create four (4) Bindings
// "binding type", "alias name...", "bucket.scope.collection", "Access"
// ---------------------------------------------------------------------------
// "bucket alias", "alias_ro", "source.myscope.*", "read only"
// "bucket alias", "alias_rw", "source.myscope.*", "read and write"
// Deploy the Function
// Create the following three (3) documents one at a time and inspect the Application log each time
// "bucket.scope.collection" KEY DATA
// ---------------------------------------------------------------------------
// source._default._default doc0 {"data": "doc0"}
// source.myscope.mycol1 doc1 {"data": "doc1"}
// source.myscope.mycol2 doc2 {"data": "doc2"}
function OnUpdate(doc, meta) {
log('>>>A IN',doc, meta);
// TEST GET with hardcode keyspace
var res1 = couchbase.get(alias_ro,{"id": "doc2", "keyspace":
{"bucket_name": "source","scope_name": "myscope","collection_name": "mycol2"}});
log('>>>B fixed read',"res1", res1);
// Protect against reading from something outside the alias
if (meta.keyspace.scope_name == "myscope") {
// TEST GET with keyspace from meta
var res2 = couchbase.get(alias_ro,meta);
log('>>>C read using passed meta (must be myscope)',"res2", res2);
if (meta.keyspace.collection_name == "mycol2") {
// TEST UPSERT with hardcode keyspace
// Add a field to the document read in res1
res1.doc.random1 = Math.random();
var res3 = couchbase.upsert(alias_rw,{"id": "doc2", "keyspace":
{"bucket_name": "source","scope_name": "myscope","collection_name": "mycol2"}}, res1.doc)
log('>>>D upsert',"res3", res3);
// TEST REPLACE with hardcode keyspace
res1.doc.random2 = Math.random();
var res4 = couchbase.replace(alias_rw,{"id": "doc2", "keyspace":
{"bucket_name": "source","scope_name": "myscope","collection_name": "mycol2"}}, res1.doc)
log('>>>E replace',"res4", res4);
// TEST GET with hardcode keyspace
var res5 = couchbase.get(alias_rw,meta);
log('>>>F get (show added fields)',"res5", res5);
// TEST DELETE with hardcode keyspace (so the insert can be tested)
var res6 = couchbase.delete(alias_rw,{"id": "doc2", "keyspace":
{"bucket_name": "source","scope_name": "myscope","collection_name": "mycol2"}})
log('>>>G delete',"res6", res6);
// TEST INSERT with hardcode keyspace
// Remove the added items
delete res1.doc.random1;
delete res1.doc.random2;
var res7 = couchbase.insert(alias_rw,{"id": "doc2", "keyspace":
{"bucket_name": "source","scope_name": "myscope","collection_name": "mycol2"}}, res1.doc)
log('>>>H upsert',"res7", res7);
}
}
}Create a test document set of 3 documents using the Query Editor to insert the data items. You do not need an Index.
Add one test document at a time.
UPSERT INTO source._default._default (KEY,VALUE) VALUES ( "doc0", {"data": "doc0"} );
UPSERT INTO source.myscope.mycol1 (KEY,VALUE) VALUES ( "doc1", {"data": "doc1"} );
UPSERT INTO source.myscope.mycol2 (KEY,VALUE) VALUES ( "doc2", {"data": "doc2"} );LOG/OUTPUT: KEY doc0
2022-07-28T17:02:04.599-07:00 [INFO] ">>>B fixed read" "res1" {"error":{"code":1,"name":"LCB_KEY_ENOENT","desc":"The document key does not exist on the server","key_not_found":true},"success":false}
2022-07-28T17:02:04.597-07:00 [INFO] ">>>A IN" {"data":"doc0"} {"cas":"1659052924529868800","id":"doc0","expiration":0,"flags":0,"vb":642,"seq":6,"datatype":"json","keyspace":{"bucket_name":"source","scope_name":"_default","collection_name":"_default"},"cid":0}
LOG/OUTPUT: KEY doc1
2022-07-28T17:03:52.902-07:00 [INFO] ">>>C read using passed meta (must be myscope)" "res2" {"doc":{"data":"doc1"},"meta":{"id":"doc1","cas":"1659053032885387264","datatype":"json"},"success":true}
2022-07-28T17:03:52.901-07:00 [INFO] ">>>B fixed read" "res1" {"error":{"code":1,"name":"LCB_KEY_ENOENT","desc":"The document key does not exist on the server","key_not_found":true},"success":false}
2022-07-28T17:03:52.898-07:00 [INFO] ">>>A IN" {"data":"doc1"} {"cas":"1659053032885387264","id":"doc1","expiration":0,"flags":0,"vb":389,"seq":9,"datatype":"json","keyspace":{"bucket_name":"source","scope_name":"myscope","collection_name":"mycol1"},"cid":8}
LOG/OUTPUT: KEY doc2
Function Log - multiCollectionEventing
2022-07-28T17:04:37.807-07:00 [INFO] ">>>H upsert" "res7" {"meta":{"id":"doc2","cas":"1659053077807104000"},"success":true}
2022-07-28T17:04:37.806-07:00 [INFO] ">>>G delete" "res6" {"meta":{"id":"doc2","cas":"1659053077806055424"},"success":true}
2022-07-28T17:04:37.805-07:00 [INFO] ">>>F get (show added fields)" "res5" {"doc":{"data":"doc2","random1":0.7875783578859457,"random2":0.47914947531399843},"meta":{"id":"doc2","cas":"1659053077803827200","datatype":"json"},"success":true}
2022-07-28T17:04:37.804-07:00 [INFO] ">>>E replace" "res4" {"meta":{"id":"doc2","cas":"1659053077803827200"},"success":true}
2022-07-28T17:04:37.803-07:00 [INFO] ">>>D upsert" "res3" {"meta":{"id":"doc2","cas":"1659053077802516480"},"success":true}
2022-07-28T17:04:37.800-07:00 [INFO] ">>>C read using passed meta (must be myscope)" "res2" {"doc":{"data":"doc2"},"meta":{"id":"doc2","cas":"1659053077704474624","datatype":"json"},"success":true}
2022-07-28T17:04:37.799-07:00 [INFO] ">>>B fixed read" "res1" {"doc":{"data":"doc2"},"meta":{"id":"doc2","cas":"1659053077704474624","datatype":"json"},"success":true}
2022-07-28T17:04:37.797-07:00 [INFO] ">>>A IN" {"data":"doc2"} {"cas":"1659053077704474624","id":"doc2","expiration":0,"flags":0,"vb":140,"seq":38,"datatype":"json","keyspace":{"bucket_name":"source","scope_name":"myscope","collection_name":"mycol2"},"cid":9}