Fabric js github

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Fabric js github

This tutorial illustrates the use of channel-based events. Channel-based events are a new feature of the Hyperledger Fabric Node. It replaces the event hub from v1. For more information on getting started with Fabric check out Building your first network.

The following assumes an understanding of Fabric networks orderers and peersand of Node application development, including the use of the Javascript Promise. A client application may use the Fabric Node. We call these "channel-based events", and they allow a client to start to receive blocks from a specific block number, allowing event processing to run normally on blocks that may have been missed.

The Fabric Node. This allows a client application to be notified of transaction completion or arbitrary chaincode events without having to perform multiple queries or search through the blocks as they are received. Applications may use block or chaincode events to provide channel data to other applications.

fabric js github

For example an application could listen for block events and write transaction data to a data store for the purpose of performing queries or other analytics against the channel's data.

The event service also allows applications to receive "filtered" block events which allow for receiving transaction validation status without providing other sensitive information. Access to "filtered" and "unfiltered" events can be configured independently in Fabric. The default behavior is to connect to receive filtered block events. To connect to receive unfiltered block events call connect true see below. Note that if you register for a block event and then submit a transaction, you should not make any assumptions about which block contains your transaction.

In particular, you should not assume that your transaction is in the block associated with the first block event received after registration to the peer's channel-based event service.

Instead, you may simply register for a transaction event. This parameter must be included when getting a new instance of the ChannelEventHub. The value may be a Peer instance or the name of a peer when using a connection profile see How to use a common common connection profile file. This parameter must be included. This is the callback function to be notified when this channel receives a new block, when listening for a specific transaction or chaincode events.

This is an optional parameter. This is the callback function to be notified when this channel event hub is shutdown. The shutdown may be caused by a fabric network error, network connection problem or by a call to the disconnect method. This callback will also be called when the channel event hub is shutdown due to the last block being received if replaying with the endBlock set to 'newest'.

When included, the Peer's channel-based event service will be asked to start sending blocks from this block number. This is how to resume listening or replay missed blocks that were added to the ledger. This option changes how the connection is made to the fabric Peer's channel-based event service, therefore the registration must be made before the channel event hub has setup the connection. This will have the block number determined by the Peer's channel-based event service at connect time of the the newest block on the ledger.

This will have the block number determined by the Peer's channel-based event service at connect time of the the oldest block on the ledger, unless your ledger has been pruned, this will be block 0.The SDK is designed to be used in the Node.

Hyperledger Fabric is the operating system of an enterprise-strength permissioned blockchain network. Applications can be developed to interact with the blockchain network on behalf of the users. APIs are available to:. Security on the Fabric is enforced with digital signatures.

All requests made to the fabric must be signed by users with appropriate enrollment certificates. For a user's enrollment certificate to be considered valid on the Fabric, it must be signed by a trusted Certificate Authority CA.

Fabric supports any standard CAs. In addition, Fabric provides a CA server. See this overview. Its modular construction enables application developers to plug in alternative implementations of key functions such as crypto suites, the state persistence store, and logging utility.

The SDK is made up of 4 top-level modules that can be accessed through the navigation menu Modules :. The following tables show versions of Fabric, Node and other dependencies that are explicitly tested and that are supported for use with version 1.

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Hyperledger Fabric SDK for node. CommitHandler api. CryptoSuite api. EndorsementHandler api. Hash api. Key api. KeyValueStore fabric-network. AbstractEventHubSelectionStrategy fabric-network. AbstractEventListener fabric-network. BaseCheckpointer fabric-network. BaseWallet fabric-network. CommitEventListener fabric-network. Contract fabric-network. ContractEventListener fabric-network.

fabric js github

CouchDBWallet fabric-network. EventHubDisconnectError fabric-network. EventHubManager fabric-network.It is renderer agnostic enabling the same api to draw in multiple contexts: svgcanvasand webgl.

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Development Version Uncompressed with comments about kb. Production Version Minified using Closure Compiler about 50kb.

Prior to v0. If you're already loading these files elsewhere then you can build the project yourself and get the file size even smaller.

For more information on custom builds check out the source on github. As a result, two. At its core two. This means that when you draw or create an object a Two. Path or Two. Grouptwo actually stores and remembers that. After you make the object you can apply any number of operations to it — e.

It is simple in nature and can be automated or paired with another animation library. For more information check out the examples.

This means developers and designers alike can create SVG elements in commercial applications like Adobe Illustrator and bring them into your two. In order to start any of these demos you'll want to download two. When you visit the page, you should be able to open up the console and type Two.

If this returns a function then you're ready to begin! Before we get into all the fancy animating it's good to get a feel for how to make shapes in two. In order to do this we need to have an instance of two. This sets up a dom element that contains either an svg or canvas element to add to the webpage.

The two object has a scene which holds all shapes as well as methods for creating shapes. For a list of all properties and construction parameters check out the documentation. Adding shapes to groups makes managing multiple shapes easier and more sane.By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The dark mode beta is finally here.

Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. All events of canvas should be called before any element is added to canvas. I didn't add an object:remove event here. You can add it yourself.

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If one element is removed, the state and list should be invalid if this element is in this array. The "event" could be "modified" or "added" and set in a corresponding event handler.

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If you have added one object, then set state[index]. If it's "added", then remove it anyway. Or when you use redo, if the target one is "added", then you added it. I've recently been quite busy. I will add codes to jsfiddle. Update: better solution to take edit history algorithm into account.

Here we can use Editing. Here is a solution that started with this simpler answer to the similar question, Undo Redo History for Canvas FabricJs. My answer is along the same lines as Tom's answer and the other answers that are modifications of Tom's answer. One important thing is that the final canvas. This is because it can take a few milliseconds to parse and load the JSON and you need to wait until that's done before you render.This tutorial illustrates the use of the service discovery by the Hyperledger Fabric Node.

The following assumes an understanding of the Hyperledger Fabric network orderers and peersand of Node application development, including the use of the Javascript promise and async await. The service discovery provided by the Hyperledger Fabric helps an application to understand the current view of the network. The service discovery also has insight into the endorsement policy of chaincodes and is able to provide various list of peers that are currently active on the network that could be used to endorse a proposal.

To use the service the application will have to connect with just one peer. The sendTransactionProposal will use the peers included in the "targets" to endorse the proposal. If there is no "targets" parameter, the endorsement request will be handled by the endorsement handler. The default handler that comes with the fabric-client is designed to use the results from the fabric discovery service. The peer that is assigned as the target during channel initialization will be the peer that is sent the discovery service request.

The discovery service results will be based on the chaincode of the endorsement or based on an endorsement hint endorsementHint included in the endorsement request. The hint may include one or more chaincodes and each chaincode may include one or more associated collection names. Results will be refreshed using the discovery-cache-life system setting.

By default the cache life is 5 minutes. This may be changed easily by using the following. If there are no service discovery results, the handler will send the endorsement request to the peers that have been assigned to the channel with the endorsingPeer role a peer that has nor been assigned a role will default to having that role, this means that a role must be explicitly turned off.

When the handler processes the discovery service results it assumes that all peers referenced have a peer instance object created and assigned to the channel instance object. The channel instance will build the required peer instances to support endorsements when it processes the discovery service results before passing the results to the handler.

The channel will not build new peer instances if the peer is already assigned to the channel either by the application or by a previous discovery service request.

Class: ChaincodeStub

The default 'DiscoveryEndorsementHandler' takes optional parameters that allow the application to specify peers or organizations that will be preferred, ignored or required.

The discovery service results will include groups of peers and layouts that specify how many peers from each group it will take to satisfy the endorsement policy of the proposal's chaincode or the endorsement policies of the endorsement hint.

Each group will be modified using the parameters of the endorsement call.

Using React and Office UI Fabric React Components

The handler will first remove peers that are not required or should be ignored. Then the group list will be sorted by ledger height or randomized. Finally preferred peers will be moved to the top of the group list. The handler will randomly select a layout to make the endorsement. The handler looks at each group in the layout and selects the number peers specified by that group in the layout. The number of peers is the number of endorsements needed to satisfy the endorsement policy.

Peers will be selected starting at the top of the modified group list to be sent an endorsement request. If any of the requests fail, the handler will select the next available peer from the modified group list.

If the number of successful endorsements reaches the number of peers called out for each group in the layout, the handler will successfully return the endorsements. If there are not enough successful endorsements, the handler will select another random layout and try again or return an error indicating that it was unable to complete successfully.

The error will include the responses from all peers. Note: The default handler does not remember the results of the previous call. Peers that may have failed will be tried again.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Already on GitHub? Sign in to your account.

After updating to Fabric 2. I get the following error:. I pass data-url of an image to fabric. I'm not sure how canvas 2. Did you try bumping up to fabric latest 3.

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions. Skip to content. Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.

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fabric js github

Jump to bottom. Labels stale. Copy link Quote reply. This comment has been minimized.We have a lot in store for Fluent UI - Read our announcement here.

Fluent UI React is the official open-source React front-end framework designed to build experiences that fit seamlessly into a broad range of Microsoft products.

Class: User

Get started with Fluent UI React. Fabric Core is an open-source collection of CSS classes and Sass mixins that give you access to colors, animations, fonts, icons and grid. Get started with Fabric Core. Fluent UI also provides resources to help you use our design language in your site.

You can also add Fluent UI React to an existing project or use one of our starter kits to create a new project. To use this package in an existing project:. Fluent UI React provides several starter kit options. Make sure you have the latest LTS Node. It'll prompt you for a project name. For example, if you call the project my-appyou can start it like this:. Open up the App. You'll see your changes in the browser seconds after you hit save. This scaffold uses the Just build library. It is very flexible and requires no "eject" script to allow customizing configuration.

Fluent UI also provides a starter using Create React Appa popular development stack maintained by the creators of React. Open a terminal, go to an appropriate folder, and clone the starter repo :. To start creating a blazing fast static website or app using Fluent UI and Gatsby. This app be deployed to the cloud in one click— learn more here. Now you're ready to explore Fluent UI controls and use them in your app!

For more detailed tutorials about developing and testing Fluent UI React apps, see the day 2 and bonus sections of this frontend bootcamp material. We also support customization of colors and more throughout the entire app using themes. For an overview of styling and theming approaches in Fluent UI, see this page.

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Then check out the links below for more details:. Fabric Core is a collection of CSS classes and Sass mixins that give you access to the colors, animations, fonts, icons and grid of the Fluent Design Language. For the MDL2 styles used in Fabric 6, replace Fabric Core is also available via npm as office-ui-fabric-coreor you can download a copy to include in your project.

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