MultiChain Developer Q&A - Recent questions tagged transaction-filters

how to upgrade stream filters code? And how to delete existing filter?

Wed, 15 Apr 2020 14:04:29 +0000

how to update filters code which is already created and s there any way to delete the filter?

Error code: -26 error message:16: bad-txns-input-duplicate

Sun, 05 Apr 2020 17:04:38 +0000

Hello, multichain, I want to use a transaction filter: approve asset transfer which is mentioned in Github link below:

Link:https://github.com/MultiChain/smart-filter-examples/blob/master/transaction-filters/approve-asset-transfer.js

Basically this filter is used to check whether the transaction is pre-approved or not. and for making an approval they have given steps in the above github link.

Basically first I created DemoAsset1 with quantity 100 in the address: 1KB85GgVgHE8fw6tMMeQ7DYS9fkY192yq8ey1V then I followed below steps

step1: to send an approval

Command:

sendfrom "1KB85GgVgHE8fw6tMMeQ7DYS9fkY192yq8ey1V" "1KB85GgVgHE8fw6tMMeQ7DYS9fkY192yq8ey1V" '{"DemoAsset1":100,"data":{"json":{"type":"approval","maxraw":1000,"expiry":1586083567}}}'

Address 1KB5G.. already had an asset with the name: DemoAsset1 but I wanted to add inline metadata i.e.

"data":{"json":{"type":"approval","maxraw":1000,"expiry":1586083567 -Necessity for adding "data" attribute was that in the github link provided above, filter code is checking for thr type:"approval". The transaction with type approval can only pass that filter code. That is why it was important for me to add this inline metadata

So for adding inline meta data I used first above mentioned command "sendfrom" where you can see from-address and to-address is same. that means I'm sending DemoAsset1 to the same address but including inline meta data i.e. "data" attribute.

Step 2: command:

createrawsendfrom "1KB85GgVgHE8fw6tMMeQ7DYS9fkY192yq8ey1V" "{\"1SF9LjmCqsA3NtVVPUe54wYwyGt6NnAG21ufU9\": {\"DemoAsset1\":5}}"

Using above command now I am trying to send amount 5of DemoAsset1 from 1KB85GgV...address to 1SF9..address. Yet I have not signed the transaction. now in output I'm getting one tx-hex.

Step3: Command:

appendrawtransaction
"010000000180699ec087e795406692b37696e4a6ca6430dd79d29fe71995d8750c7248d2040000000000ffffffff0200000000000000003776a914bac7060886d618cf2ead989a6d65b449e071497588ac1c73706b71784b4999c545a9b3494f7bdf06fa06c032000000000000007500000000000000003776a9148678ce5ac500e4f06bacdb58d7397319baed19be88ac1c73706b71784b4999c545a9b3494f7bdf06fa06c0b6030000000000007500000000" "[{\"txid\":\"04d248720c75d89519e79fd279dd3064caa6e49676b392664095e787c09e6980\",\"vout\":0}]" "{\" 1KB85GgVgHE8fw6tMMeQ7DYS9fkY192yq8ey1V\":{\"DemoAsset1\":5}}"

In above command using appendrawtransaction I'm appending highlighted txid and vout to the above transaction which was created using createrawtransaction. Added txid and vout is the txid of DemoAsset1. I got that txid and vout by using command listunspent. O/P: I got another long tx-hex code.

Step 4: signrawtransaction above-long-tx-hex

o/p: Long-tx-hex.

Step 5: Now to send raw transaction I finally took last step:

sendrawtransaction long-tx-hex(got in step 4)

After attempting step 5. I got the error mentioned in the question. Error code: -26 error message:16: bad-txns-input-duplicate . i'm attaching here the decoded raw transaction after step 3:

I want to share UTXO but characters limit is not allowing me. So I will ask relatable question with the title

"Error code: -26 error message:16: bad-txns-input-duplicate part 2" please refer to this question too for understanding this error fully.

Please Provide Example of 4 steps of "To use an approval" of transaction-filter github code: To use an approval"

Sat, 21 Mar 2020 10:30:32 +0000

Sir the ways you mentioned are not helpful

Referer this code:

https://github.com/MultiChain/smart-filter-examples/blob/master/transaction-filters/approve-asset-transfer.js

Here they have mentioned steps "to use an approval" in which the commands which are mentioned are:

createrawsendfrom and appendrawtransaction, there is no syntax given in any links provided by multichain and the links which you have mentioned in my previous question.

You may say the other commands are similar so I should refer that, so I would like to tell you that I have already referred and tried executing that and accordingly I also tried above commands but I'm facing syntax issue that is why I wanted proper guidance. If you could provide me that 4 steps example with syntax then I would really appreciate it.

Can you please provide me an example of "To use an approval" steps:

Thu, 19 Mar 2020 16:45:32 +0000

Can you please give me an example of those 4 steps?? I know the commands are given but if any demo example you can give consisting of those 4 steps would be really helpful for me. Please I request you.

In that code link it is said that first, we need to send approval, so please provide me the example where you first send approval using "sendfrom" command and then those 4 steps.
Sender address you can take :1KB85GgVgHE8fw6tMMeQ7DYS9fkY192yk8uy1V
Receiver address you can take :1MB85GgVgHE8fw6tMMeQ7DYS9fkY192yk8uy1V

Github transaction filter example: Approve Asset Transfer, I'm not able to understand this code?

Sun, 15 Mar 2020 10:16:57 +0000

Code link: https://github.com/MultiChain/smart-filter-examples/blob/master/transaction-filters/approve-asset-transfer.js

Error:

Filter code blocked this transaction with the reason: (time taken 0.001472 seconds)
Address 1KB85GgVgHyters6tMMeQ7DYS9fkY192yq8ey1V did not include sufficient USD spending approvals in this transaction false undefined

I'm trying to understand GitHub transaction filter example- approve asset transfer.

If I have understood it correctly, that code is processing an only pre-approved transaction. pre-approved transactions are those whom approvals are given by the address with low-1 permissions. And that approvals are provided by the command:

sendfrom <approver-address> <approvee-address> {"data":{"json":{"type":"approval","maxraw":<rawqty>,"expiry":<expiry>}}}

So I gave approvals using the above command and I set max raw quantity and expiry as last block time. And then I tried to run this code. But still, I'm getting the above error. To identify that my approval is set properly, I'm checking variable like

for (var inputnum=0; inputnum<tx.vin.length; inputnum++) {

var spentoutput=getfiltertxinput(inputnum);

if (

outputisapproval(spentoutput) &&

(spentoutput.scriptPubKey.addresses[0]==address)&&

(spentoutput.data[0].json.expiry >= getlastblockinfo().time)

) {

requiredraw-=spentoutput.data[0].json.maxraw; /* we can use this approval */

}

if (requiredraw>0)

return "Address "+address+" did not include sufficient USD spending approvals in this transaction "+hasapproval+" "+spentoutput.data;

}

why spentoutput.data is returned as undefined even when I have given approvals:

command:

sendfrom 1KB85GgVgHyters6tMMeQ7DYS9fkY192yq8ey1V 192ruBtNjWSXUQi2xpWmka5M14rUbNNxzxTbcb '{"data":{"json":{"type":"approval","maxraw":10000000,"expiry":1584258634}}}'

Please resolve my doubt asap.

How to create transaction filters?

Fri, 24 Jan 2020 05:15:14 +0000

Hello everyone,

I am a beginner. Currently I have started to learn Multichain's transaction filter. But when i read the documentation i am not able to understand that how do i start creating transaction filters? Where it should be located? How it is processed by every node?

It would be really great if someone can explain me its each step for How to create transaction filters? Where to create? How to process or run that transaction filters?

Please help me with this asap.

Max value in max-std-element-size ?

Wed, 21 Aug 2019 18:17:58 +0000

I'm trying to set it to 150KB but everything above 100KB fails.

I need to create a 102KB Transaction Filter and would like how I can work around that?

Sorry for the short description, I'm from mobile.

forcing a transaction to go through an external API before sending

Tue, 28 May 2019 17:02:37 +0000

Is it possible to use transaction filters to make a sending transaction go through an external API, to get a success or fail for it to progress or fail the transaction?.. It would send the receiver address to an external API, check that address to meet criteria and then return yes or no response that could be acted upon by the transaction filter...perhaps with a timeout if nothing received within say 10 seconds..

Creating new transaction filter

Tue, 05 Feb 2019 08:59:00 +0000

Hello Devs,

I am deploying new transaction filter in netwok but it's throwing me parsing error and not getting deployed on chain can any body suggest me what to do now?

create txfilter filter4 "{}" "function filtertransaction()

{

var addressbalancechange=getfilterassetbalances("USD", true);

for (var address in addressbalancechange)

if (addressbalancechange[address]>1000)

return "Address "+address+" is receiving too much USD";

}"

reject transaction filter working before approvefrom is executed

Mon, 22 Oct 2018 04:32:47 +0000

I tried to deploy the reject-all-transactions.js given in the code examples. The filter was compiled and then when I tried to run the approvefrom true for the filter it just doesn't allow it. The filter is working already for the approvefrom command only. It doesn't apply to other transactions. Attaching my code execution below.

testingsmartfilters: getfiltercode rejectfilter
{"method":"getfiltercode","params":["rejectfilter"],"id":"31237136-1540182035","chain_name":"testingsmartfilters"}

function filtertransaction() { return 'All transactions rejected' }
testingsmartfilters: listtxfilters
{"method":"listtxfilters","params":[],"id":"62675408-1540182044","chain_name":"testingsmartfilters"}

[
{
"name" : "firstfilter",
"createtxid" : "a72e6bcb8e49cc07c81b694d22d85ffb4be591d27b09ae6581fb9eea18626718",
"filterref" : "47-265-11943",
"language" : "javascript",
"codelength" : 139,
"for" : [
],
"compiled" : true,
"approved" : true
},
{
"name" : "rejectfilter",
"createtxid" : "2aed8e513fc295af15010bd39409f26a7033017dfad98c5b53c4dc051959ba6d",
"filterref" : "71-265-60714",
"language" : "javascript",
"codelength" : 67,
"for" : [
],
"compiled" : true,
"approved" : false
}
]
testingsmartfilters: approvefrom 1KHCUryUcu8MBcvwiF5zgxePbVfm18JJv4 rejectfilter false
{"method":"approvefrom","params":["1KHCUryUcu8MBcvwiF5zgxePbVfm18JJv4","rejectfilter",false],"id":"84112443-1540182070","chain_name":"testingsmartfilters"}

2e28c4b7d7d823d169183ca02194ebdab2c06b186004094436ef6680c4d3fa4d
testingsmartfilters: approvefrom 1KHCUryUcu8MBcvwiF5zgxePbVfm18JJv4 rejectfilter true
{"method":"approvefrom","params":["1KHCUryUcu8MBcvwiF5zgxePbVfm18JJv4","rejectfilter",true],"id":"47671806-1540182074","chain_name":"testingsmartfilters"}

error code: -26
error message:
Error: The transaction was rejected: 64: The transaction did not pass filter rejectfilter (txid 2aed8e513fc295af15010bd39409f26a7033017dfad98c5b53c4dc051959ba6d): All transactions rejected
testingsmartfilters:

Issues when applying tx filters

Mon, 15 Oct 2018 12:42:39 +0000

Hi team (possible this is a duplication, as previous one I asked w/o being a member, sr for any inconvenience),

I've been trying to test the latest tx filters by using this script to limit asset for USD, but I had some issues, as below:

The filter actually filtered out the tx in the strange behaviour, as given, if value > 1000 it will be error, but even when I put 100 or 500, it also rejected the tx
When I approved the tx filters, the blockchain stopped producing new blocks (check with block height), all attempts to start again the chain are not successful

Here are the commands I've used:

multichain-cli test1 issuefrom 1Cr6VxbSQ5TMfegbUSgY4t1F2ing2QH2yVLgAd 1Cr6VxbSQ5TMfegbUSgY4t1F2ing2QH2yVLgAd '{"name":"USD","open":true}' 50000 0.01 0 '{"origin":"us", "stage":"01", "purpose":"parts prepayment"}'

multichain-cli test1 sendasset 1bND5DeePFNmrWBoeaVn4z6WJiYSQv9jMwSwY7 USD 3000

multichain-cli test1 create txfilter testfilter '{"for":"USD"}' 'function outputtoaddressbalancechange(output, spent, addressbalancechange) { if (output.assets) { for (var assetnum=0; assetnum<output.assets.length; assetnum++) { if (output.assets[assetnum].name=="USD") { for (var addressnum=0; addressnum<output.scriptPubKey.addresses.length; addressnum++) { var address=output.scriptPubKey.addresses[addressnum]; if (!addressbalancechange.hasOwnProperty(address)) addressbalancechange[address]=0; var rawchange=spent ? -output.assets[assetnum].raw : output.assets[assetnum].raw; addressbalancechange[address]+=rawchange; } } } } } function filtertransaction() { var tx=getfiltertransaction(); var addressbalancechange={}; for (var inputnum=0; inputnum<tx.vin.length; inputnum++) { outputtoaddressbalancechange(getfiltertxinput(inputnum), true, addressbalancechange); } for (var outputnum=0; outputnum<tx.vout.length; outputnum++) { outputtoaddressbalancechange(tx.vout[outputnum], false, addressbalancechange); } for (var address in addressbalancechange) if (addressbalancechange[address]>1000) return "Address "+address+" is receiving too much USD"; }'

multichain-cli test1 approvefrom 1bND5DeePFNmrWBoeaVn4z6WJiYSQv9jMwSwY7 testfilter true

Do you have any reasons for the strange behavior from the chain?

Thank you for your support,

Best,

Smart Filters and JSON-RPC APIs

Tue, 09 Oct 2018 17:53:33 +0000

Is it possible to use in Smart Filters the standard Multichain APIs, other than those explicitly listed in the page "Working with Smart Filters" (getassetinfo, getblockinfo,...)?

Thanks.

So... Smart Filters!

Thu, 13 Sep 2018 22:25:13 +0000

Once a smart filter (transaction-filter) is approved, is it applied to all transactions on that blockchain from that block onwards?

Please define a callback in layman's terms.

Can one smart filter reference another?

Thanks