Examples of interacting with a Polkadot node using Rust

Parity Technologies

Last update: Dec 21, 2022

Related tags

Network programming polkadot-interaction-examples-rs

Overview

Examples of interacting with a Polkadot node

Some examples of using JSON RPC to interact with a Polkadot node, working up to manually building and submitting a balance transfer.

To run these examples, first start up a local Polkadot node (which we'll be interacting with):

# Clone the polkadot repo:
git clone https://github.com/paritytech/polkadot.git
# This is the commit I used (the examples will likely break as master is updated):
git checkout f3f83e3f9db049f981066b3a94fa17cad673299f
# Start up a polkadot dev node on your machine:
cargo run -- --tmp --dev

Once you have this node running, in another terminal, pick an example you'd like to run from the src/bin folder and run it like so:

cargo run --bin 01_basic

Note that the balance transfer example expects a fresh dev node (the transaction has a nonce which means it can't be executed more than once). Just restart the Polkadot node to get back to a fresh state.

The examples are well commented, so check them out to find out more!

One really useful tip for debugging what is happening is to visit https://polkadot.js.org/apps, and point it at your local node (click top left corner and in the "development" tab, point it to the node at ws://127.0.0.1:9944). Using this, you can see the balance transfer in example 05 take place, and compare other results with the actual node state.

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Comments

Add Storage Iterator example for Double Map

The example iterates over the XcmPallet's VersionNotifiers keys while decoding the raw bytes to user-friendly representations. The example also obtains the value stored in the node at those locations.

To achieve this XCM interaction a WebSocket client is introduced, running against a local node. Other examples are updated with the latest version of substrate.

VersionNotifiers storage key: 0x1405f2411d0af5a7ff397e7c9dc68d19db8f48f20e9ff76107a081bb8a607cd5
Obtained keys:
Key: 0x1405f2411d0af5a7ff397e7c9dc68d19db8f48f20e9ff76107a081bb8a607cd59eb2dcce60f37a270200000005dd59ff1333ed58157a7deed14d96af01000100511f
     bytes[ 0..16]: 0x1405f2411d0af5a7ff397e7c9dc68d19 == twox_128("XcmPallet")
     bytes[16..32]: 0xdb8f48f20e9ff76107a081bb8a607cd5 == twox_128("VersionNotifiers")
     bytes[32..40]: 0x9eb2dcce60f37a27                 == twox_64(first key)
     bytes[40..44]: 0x02000000                         == first key - XcmVersion: 2
     bytes[44..60]: 0x05dd59ff1333ed58157a7deed14d96af == blake2_128(second key)
     bytes[60..  ]: 0x01000100511f                     == second key - VersionedMultiLocation: V1(MultiLocation { parents: 0, interior: X1(Parachain(2004)) })
  Value: 4

Key: 0x1405f2411d0af5a7ff397e7c9dc68d19db8f48f20e9ff76107a081bb8a607cd59eb2dcce60f37a2702000000100d8a96165380224fcebf540672e38c01000100411f
     bytes[ 0..16]: 0x1405f2411d0af5a7ff397e7c9dc68d19 == twox_128("XcmPallet")
     bytes[16..32]: 0xdb8f48f20e9ff76107a081bb8a607cd5 == twox_128("VersionNotifiers")
     bytes[32..40]: 0x9eb2dcce60f37a27                 == twox_64(first key)
     bytes[40..44]: 0x02000000                         == first key - XcmVersion: 2
     bytes[44..60]: 0x100d8a96165380224fcebf540672e38c == blake2_128(second key)
     bytes[60..  ]: 0x01000100411f                     == second key - VersionedMultiLocation: V1(MultiLocation { parents: 0, interior: X1(Parachain(2000)) })
  Value: 7

Key: 0x1405f2411d0af5a7ff397e7c9dc68d19db8f48f20e9ff76107a081bb8a607cd59eb2dcce60f37a27020000004e764be91a94f8c0b1516f7775b719ea01000100a10f
     bytes[ 0..16]: 0x1405f2411d0af5a7ff397e7c9dc68d19 == twox_128("XcmPallet")
     bytes[16..32]: 0xdb8f48f20e9ff76107a081bb8a607cd5 == twox_128("VersionNotifiers")
     bytes[32..40]: 0x9eb2dcce60f37a27                 == twox_64(first key)
     bytes[40..44]: 0x02000000                         == first key - XcmVersion: 2
     bytes[44..60]: 0x4e764be91a94f8c0b1516f7775b719ea == blake2_128(second key)
     bytes[60..  ]: 0x01000100a10f                     == second key - VersionedMultiLocation: V1(MultiLocation { parents: 0, interior: X1(Parachain(1000)) })
  Value: 2

Key: 0x1405f2411d0af5a7ff397e7c9dc68d19db8f48f20e9ff76107a081bb8a607cd59eb2dcce60f37a270200000077250378cce57ae600f6c271b88c7649010001000920
     bytes[ 0..16]: 0x1405f2411d0af5a7ff397e7c9dc68d19 == twox_128("XcmPallet")
     bytes[16..32]: 0xdb8f48f20e9ff76107a081bb8a607cd5 == twox_128("VersionNotifiers")
     bytes[32..40]: 0x9eb2dcce60f37a27                 == twox_64(first key)
     bytes[40..44]: 0x02000000                         == first key - XcmVersion: 2
     bytes[44..60]: 0x77250378cce57ae600f6c271b88c7649 == blake2_128(second key)
     bytes[60..  ]: 0x010001000920                     == second key - VersionedMultiLocation: V1(MultiLocation { parents: 0, interior: X1(Parachain(2050)) })
  Value: 6

Key: 0x1405f2411d0af5a7ff397e7c9dc68d19db8f48f20e9ff76107a081bb8a607cd59eb2dcce60f37a27020000007c40b0b99e93a82fa5901740fd6c0eba01000100711f
     bytes[ 0..16]: 0x1405f2411d0af5a7ff397e7c9dc68d19 == twox_128("XcmPallet")
     bytes[16..32]: 0xdb8f48f20e9ff76107a081bb8a607cd5 == twox_128("VersionNotifiers")
     bytes[32..40]: 0x9eb2dcce60f37a27                 == twox_64(first key)
     bytes[40..44]: 0x02000000                         == first key - XcmVersion: 2
     bytes[44..60]: 0x7c40b0b99e93a82fa5901740fd6c0eba == blake2_128(second key)
     bytes[60..  ]: 0x01000100711f                     == second key - VersionedMultiLocation: V1(MultiLocation { parents: 0, interior: X1(Parachain(2012)) })
  Value: 3

Key: 0x1405f2411d0af5a7ff397e7c9dc68d19db8f48f20e9ff76107a081bb8a607cd59eb2dcce60f37a2702000000b3004529114de762981310e9a525ec1901000100690a
     bytes[ 0..16]: 0x1405f2411d0af5a7ff397e7c9dc68d19 == twox_128("XcmPallet")
     bytes[16..32]: 0xdb8f48f20e9ff76107a081bb8a607cd5 == twox_128("VersionNotifiers")
     bytes[32..40]: 0x9eb2dcce60f37a27                 == twox_64(first key)
     bytes[40..44]: 0x02000000                         == first key - XcmVersion: 2
     bytes[44..60]: 0xb3004529114de762981310e9a525ec19 == blake2_128(second key)
     bytes[60..  ]: 0x01000100690a                     == second key - VersionedMultiLocation: V1(MultiLocation { parents: 0, interior: X1(Parachain(666)) })
  Value: 5

Key: 0x1405f2411d0af5a7ff397e7c9dc68d19db8f48f20e9ff76107a081bb8a607cd59eb2dcce60f37a2702000000de763eb59c21d5cf088fab93114f368b01000100591f
     bytes[ 0..16]: 0x1405f2411d0af5a7ff397e7c9dc68d19 == twox_128("XcmPallet")
     bytes[16..32]: 0xdb8f48f20e9ff76107a081bb8a607cd5 == twox_128("VersionNotifiers")
     bytes[32..40]: 0x9eb2dcce60f37a27                 == twox_64(first key)
     bytes[40..44]: 0x02000000                         == first key - XcmVersion: 2
     bytes[44..60]: 0xde763eb59c21d5cf088fab93114f368b == blake2_128(second key)
     bytes[60..  ]: 0x01000100591f                     == second key - VersionedMultiLocation: V1(MultiLocation { parents: 0, interior: X1(Parachain(2006)) })
  Value: 8

opened by lexnv 1

Bump tokio from 1.18.2 to 1.18.4
Bumps tokio from 1.18.2 to 1.18.4.

Release notes

Sourced from tokio's releases.

Tokio v1.18.3

1.18.3 (September 27, 2022)

This release removes the dependency on the once_cell crate to restore the MSRV of the 1.18.x LTS release. (#5048)

#5048: tokio-rs/tokio#5048

Commits

9241c3e chore: prepare Tokio v1.18.4 release

699573d net: fix named pipes server configuration builder

5c76d07 chore: prepare Tokio v1.18.3 (#5051)

05e6614 chore: don't use once_cell for 1.18.x LTS release (#5048)

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dependencies
opened by dependabot[bot] 0
Bump thread_local from 1.1.3 to 1.1.4
Bumps thread_local from 1.1.3 to 1.1.4.

Commits

4a54e57 Bump version to 1.1.4

ebf8b45 Merge pull request #34 from ibraheemdev/patch-1

3d69afa Fix memory ordering in RawIter::next

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opened by dependabot[bot] 0

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Astar Network is an interoperable blockchain based the Substrate framework and the hub for dApps within the Polkadot Ecosystem

Astar Network is an interoperable blockchain based the Substrate framework and the hub for dApps within the Polkadot Ecosystem. With Astar Network and