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Migrating to NEAR Lake Framework

We encourage everyone who don't have a hard requirement to use NEAR Indexer Framework consider the migration to NEAR Lake Framework.

In this tutorial we'll show you how to migrate the project using indexer-tx-watcher-example as a showcase.

Source code

The source code for the migrated indexer can be found on GitHub https://github.com/near-examples/indexer-tx-watcher-example-lake/tree/0.4.0

Diffs

We've posted the diffs for the reference in the end of the article, you can scroll down to them if diffs are all you need in order to migrate your indexer

Changing the dependencies​

First of all we'll start from the dependencies in Cargo.toml


[package]
name = "indexer-tx-watcher-example"
version = "0.1.0"
authors = ["Near Inc <hello@nearprotocol.com>"]
edition = "2018"

[dependencies]
actix = "=0.11.0-beta.2"
actix-rt = "=2.2.0"  # remove it once actix is upgraded to 0.11+
base64 = "0.11"
clap = "3.0.0-beta.1"
openssl-probe = { version = "0.1.2" }
serde = { version = "1", features = ["derive"] }
serde_json = "1.0.55"
tokio = { version = "1.1", features = ["sync"] }
tracing = "0.1.13"
tracing-subscriber = "0.2.4"

near-indexer = { git = "https://github.com/near/nearcore", rev = "25b000ae4dd9fe784695d07a3f2e99d82a6f10bd" }
  • Update edition to 2021
  • Drop actix crates
  • Drop openssl-probe crate
  • Add futures and itertools
  • Add features to tokio as we will be using tokio runtime
  • Add tokio-stream crate
  • Replace near-indexer with near-lake-framework

So in the end we'll have this after all:

[package]
name = "indexer-tx-watcher-example"
version = "0.1.0"
authors = ["Near Inc <hello@nearprotocol.com>"]
edition = "2021"

[dependencies]
base64 = "0.11"
clap = { version = "3.1.6", features = ["derive"] }
futures = "0.3.5"
serde = { version = "1", features = ["derive"] }
serde_json = "1.0.55"
itertools = "0.9.0"
tokio = { version = "1.1", features = ["sync", "time", "macros", "rt-multi-thread"] }
tokio-stream = { version = "0.1" }
tracing = "0.1.13"
tracing-subscriber = "0.2.4"

near-lake-framework = "0.4.0"

Change the clap configs​

Currently we have structure Opts that has a subcommand with Run and Init command. Since NEAR Lake Framework doesn't need data and config files we don't need Init at all. So we need to combine some structures into Opts itself.

...
/// NEAR Indexer Example
/// Watches for stream of blocks from the chain
#[derive(Clap, Debug)]
#[clap(version = "0.1", author = "Near Inc. <hello@nearprotocol.com>")]
pub(crate) struct Opts {
    /// Sets a custom config dir. Defaults to ~/.near/
    #[clap(short, long)]
    pub home_dir: Option<std::path::PathBuf>,
    #[clap(subcommand)]
    pub subcmd: SubCommand,
}

#[derive(Clap, Debug)]
pub(crate) enum SubCommand {
    /// Run NEAR Indexer Example. Start observe the network
    Run(RunArgs),
    /// Initialize necessary configs
    Init(InitConfigArgs),
}

#[derive(Clap, Debug)]
pub(crate) struct RunArgs {
    /// account ids to watch for
    #[clap(long)]
    pub accounts: String,
}

#[derive(Clap, Debug)]
pub(crate) struct InitConfigArgs {
    ...
}
...

We are going:

  • Drop InitConfigArgs completely
  • Move the content from RunArgs to Opts and then drop RunArgs
  • Drop home_dir from Opts
  • Add block_height to Opts to know from which block height to start indexing
  • Refactor SubCommand to have to variants: mainnet and testnet to define what chain to index
  • And add Clone detive to the structs for later
/// NEAR Indexer Example
/// Watches for stream of blocks from the chain
#[derive(Clap, Debug, Clone)]
#[clap(version = "0.1", author = "Near Inc. <hello@nearprotocol.com>")]
pub(crate) struct Opts {
    /// block height to start indexing from
    #[clap(long)]
    pub block_height: u64,
    /// account ids to watch for
    #[clap(long)]
    pub accounts: String,
    #[clap(subcommand)]
    pub subcmd: SubCommand,
}

#[derive(Clap, Debug, Clone)]
pub(crate) enum SubCommand {
    Mainnet,
    Testnet,
}

In the end of the file we have one implementation we need to replace.

...
impl From<InitConfigArgs> for near_indexer::InitConfigArgs {
    ...
}

We want to be able to cast Opts to near_lake_framework::LakeConfig. So we're going to create a new implementation.

impl From<Opts> for near_lake_framework::LakeConfig {
    fn from(opts: Opts) -> Self {
        let mut lake_config =
            near_lake_framework::LakeConfigBuilder::default().start_block_height(opts.block_height);

        match &opts.subcmd {
            SubCommand::Mainnet => {
                lake_config = lake_config.mainnet();
            }
            SubCommand::Testnet => {
                lake_config = lake_config.testnet();
            }
        };

        lake_config.build().expect("Failed to build LakeConfig")
    }
}

And the final move is to change init_logging function to remove redundant log subscriptions:


...
pub(crate) fn init_logging() {
    let env_filter = EnvFilter::new(
        "tokio_reactor=info,near=info,stats=info,telemetry=info,indexer_example=info,indexer=info,near-performance-metrics=info",
    );
    tracing_subscriber::fmt::Subscriber::builder()
        .with_env_filter(env_filter)
        .with_writer(std::io::stderr)
        .init();
}
...

Replace it with

...
pub(crate) fn init_logging() {
    let env_filter = EnvFilter::new("near_lake_framework=info");
    tracing_subscriber::fmt::Subscriber::builder()
        .with_env_filter(env_filter)
        .with_writer(std::io::stderr)
        .init();
}
...

Finally we're done with src/config.rs and now we can move on to src/main.rs

Replacing the indexer instantiation​

Since we can use tokio runtime and make our main function asynchronous it's shorted to show the recreating of the main function than the process of refactoring.

Let's start from import section

Imports before​

use std::str::FromStr;

use std::collections::{HashMap, HashSet};

use clap::Clap;
use tokio::sync::mpsc;
use tracing::info;

use configs::{init_logging, Opts, SubCommand};

mod configs;

Imports after​

We're adding near_lake_framework imports and remove redundant import from configs.

use std::str::FromStr;

use std::collections::{HashMap, HashSet};

use clap::Clap;
use tokio::sync::mpsc;
use tracing::info;

use near_lake_framework::near_indexer_primitives;
use near_lake_framework::LakeConfig;

use configs::{init_logging, Opts};

Creating main()​

Let's create an async main() function, call init_logging and read the Opts.

#[tokio::main]
async fn main() -> Result<(), tokio::io::Error> {
    init_logging();

    let opts: Opts = Opts::parse();

Let's cast LakeConfig from Opts and instantiate NEAR Lake Framework's stream

#[tokio::main]
async fn main() -> Result<(), tokio::io::Error> {
    init_logging();

    let opts: Opts = Opts::parse();

    let config: LakeConfig = opts.clone().into();

    let (_, stream) = near_lake_framework::streamer(config);

Copy/paste the code of reading accounts arg to Vec<AccountId> from the old main()

#[tokio::main]
async fn main() -> Result<(), tokio::io::Error> {
    init_logging();

    let opts: Opts = Opts::parse();

    let config: LakeConfig = opts.clone().into();

    let (_, stream) = near_lake_framework::streamer(config);

    let watching_list = opts
        .accounts
        .split(',')
        .map(|elem| {
            near_indexer_primitives::types::AccountId::from_str(elem).expect("AccountId is invalid")
        })
        .collect();

Now we can call listen_blocks function we have used before in our indexer while it was built on top of NEAR Indexer Framework. And return Ok(()) so our main() would be happy.

Final async main with NEAR Lake Framework stream​

#[tokio::main]
async fn main() -> Result<(), tokio::io::Error> {
    init_logging();

    let opts: Opts = Opts::parse();

    let config: LakeConfig = opts.clone().into();

    let (_, stream) = near_lake_framework::streamer(config);

    let watching_list = opts
        .accounts
        .split(',')
        .map(|elem| {
            near_indexer_primitives::types::AccountId::from_str(elem).expect("AccountId is invalid")
        })
        .collect();

    listen_blocks(stream, watching_list).await;

    Ok(())
}

We're done. That's pretty much entire main() function. Drop the old one if you haven't yet.

Along with NEAR Lake Framework release we have extracted the structures created for indexers into a separate crate. This was done in order to avoid dependency on nearcore as now you can depend on a separate crate that is already published on crates.io or on NEAR Lake Framework that exposes that crate.

listen_blocks​

A function signature needs to be changed to point to new place for data types

async fn listen_blocks(
    mut stream: mpsc::Receiver<near_indexer::StreamerMessage>,
    watching_list: Vec<near_indexer::near_primitives::types::AccountId>,
 ) {
async fn listen_blocks(
    mut stream: mpsc::Receiver<near_indexer_primitives::StreamerMessage>,
    watching_list: Vec<near_indexer_primitives::types::AccountId>,
 ) {

And another 3 places where near_indexer::near_primitives needs to be replaced with near_indexer_primitives


if let near_indexer_primitives::views::ReceiptEnumView::Action {
if let near_indexer_primitives::views::ReceiptEnumView::Action {
if let near_indexer_primitives::views::ActionView::FunctionCall {

is_tx_receiver_watched()​

And final change for data types in the function is_tx_receiver_watched()

fn is_tx_receiver_watched(
    tx: &near_indexer_primitives::IndexerTransactionWithOutcome,
    watching_list: &[near_indexer_primitives::types::AccountId],
) -> bool {
    watching_list.contains(&tx.transaction.receiver_id)
}

Credentials​

Configure the Credentials in order to access the data from NEAR Lake Framework

Conclusion​

And now we have a completely migrated to NEAR Lake Framework indexer.

We are posting the complete diffs for the reference

Diffs​

--- a/Cargo.toml
+++ b/Cargo.toml
@@ -2,18 +2,18 @@
 name = "indexer-tx-watcher-example"
 version = "0.1.0"
 authors = ["Near Inc <hello@nearprotocol.com>"]
-edition = "2018"
+edition = "2021"

 [dependencies]
-actix = "=0.11.0-beta.2"
-actix-rt = "=2.2.0"  # remove it once actix is upgraded to 0.11+
 base64 = "0.11"
-clap = "3.0.0-beta.1"
-openssl-probe = { version = "0.1.2" }
+clap = { version = "3.1.6", features = ["derive"] }
+futures = "0.3.5"
 serde = { version = "1", features = ["derive"] }
 serde_json = "1.0.55"
-tokio = { version = "1.1", features = ["sync"] }
+itertools = "0.9.0"
+tokio = { version = "1.1", features = ["sync", "time", "macros", "rt-multi-thread"] }
+tokio-stream = { version = "0.1" }
 tracing = "0.1.13"
 tracing-subscriber = "0.2.4"

-near-indexer = { git = "https://github.com/near/nearcore", rev = "25b000ae4dd9fe784695d07a3f2e99d82a6f10bd" }
+near-lake-framework = "0.4.0"
--- a/src/configs.rs
+++ b/src/configs.rs
@@ -1,99 +1,50 @@
-use clap::Clap;
+use clap::Parser;

 use tracing_subscriber::EnvFilter;

 /// NEAR Indexer Example
 /// Watches for stream of blocks from the chain
-#[derive(Clap, Debug)]
+#[derive(Parser, Debug, Clone)]
 #[clap(version = "0.1", author = "Near Inc. <hello@nearprotocol.com>")]
 pub(crate) struct Opts {
-    /// Sets a custom config dir. Defaults to ~/.near/
-    #[clap(short, long)]
-    pub home_dir: Option<std::path::PathBuf>,
-    #[clap(subcommand)]
-    pub subcmd: SubCommand,
-}
-
-#[derive(Clap, Debug)]
-pub(crate) enum SubCommand {
-    /// Run NEAR Indexer Example. Start observe the network
-    Run(RunArgs),
-    /// Initialize necessary configs
-    Init(InitConfigArgs),
-}
-
-#[derive(Clap, Debug)]
-pub(crate) struct RunArgs {
+    /// block height to start indexing from
+    #[clap(long)]
+    pub block_height: u64,
     /// account ids to watch for
     #[clap(long)]
     pub accounts: String,
+    #[clap(subcommand)]
+    pub subcmd: SubCommand,
 }

-#[derive(Clap, Debug)]
-pub(crate) struct InitConfigArgs {
-    /// chain/network id (localnet, testnet, devnet, betanet)
-    #[clap(short, long)]
-    pub chain_id: Option<String>,
-    /// Account ID for the validator key
-    #[clap(long)]
-    pub account_id: Option<String>,
-    /// Specify private key generated from seed (TESTING ONLY)
-    #[clap(long)]
-    pub test_seed: Option<String>,
-    /// Number of shards to initialize the chain with
-    #[clap(short, long, default_value = "1")]
-    pub num_shards: u64,
-    /// Makes block production fast (TESTING ONLY)
-    #[clap(short, long)]
-    pub fast: bool,
-    /// Genesis file to use when initialize testnet (including downloading)
-    #[clap(short, long)]
-    pub genesis: Option<String>,
-    /// Download the verified NEAR genesis file automatically.
-    #[clap(long)]
-    pub download_genesis: bool,
-    /// Specify a custom download URL for the genesis file.
-    #[clap(long)]
-    pub download_genesis_url: Option<String>,
-    /// Download the verified NEAR config file automatically.
-    #[clap(long)]
-    pub download_config: bool,
-    /// Specify a custom download URL for the config file.
-    #[clap(long)]
-    pub download_config_url: Option<String>,
-    /// Specify the boot nodes to bootstrap the network
-    #[clap(long)]
-    pub boot_nodes: Option<String>,
-    /// Specify a custom max_gas_burnt_view limit.
-    #[clap(long)]
-    pub max_gas_burnt_view: Option<u64>,
+#[derive(Parser, Debug, Clone)]
+pub(crate) enum SubCommand {
+    Mainnet,
+    Testnet,
 }

 pub(crate) fn init_logging() {
-    let env_filter = EnvFilter::new(
-        "tokio_reactor=info,near=info,stats=info,telemetry=info,indexer_example=info,indexer=info,near-performance-metrics=info",
-    );
+    let env_filter = EnvFilter::new("near_lake_framework=info");
     tracing_subscriber::fmt::Subscriber::builder()
         .with_env_filter(env_filter)
         .with_writer(std::io::stderr)
         .init();
 }

-impl From<InitConfigArgs> for near_indexer::InitConfigArgs {
-    fn from(config_args: InitConfigArgs) -> Self {
-        Self {
-            chain_id: config_args.chain_id,
-            account_id: config_args.account_id,
-            test_seed: config_args.test_seed,
-            num_shards: config_args.num_shards,
-            fast: config_args.fast,
-            genesis: config_args.genesis,
-            download_genesis: config_args.download_genesis,
-            download_genesis_url: config_args.download_genesis_url,
-            download_config: config_args.download_config,
-            download_config_url: config_args.download_config_url,
-            boot_nodes: config_args.boot_nodes,
-            max_gas_burnt_view: config_args.max_gas_burnt_view,
-        }
+impl From<Opts> for near_lake_framework::LakeConfig {
+    fn from(opts: Opts) -> Self {
+        let mut lake_config =
+            near_lake_framework::LakeConfigBuilder::default().start_block_height(opts.block_height);
+
+        match &opts.subcmd {
+            SubCommand::Mainnet => {
+                lake_config = lake_config.mainnet();
+            }
+            SubCommand::Testnet => {
+                lake_config = lake_config.testnet();
+            }
+        };
+
+        lake_config.build().expect("Failed to build LakeConfig")
     }
 }
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,11 +2,14 @@

 use std::collections::{HashMap, HashSet};

-use clap::Clap;
+use clap::Parser;
 use tokio::sync::mpsc;
 use tracing::info;

-use configs::{init_logging, Opts, SubCommand};
+use near_lake_framework::near_indexer_primitives;
+use near_lake_framework::LakeConfig;
+
+use configs::{init_logging, Opts};

 mod configs;

@@ -15,60 +18,34 @@
 /// We want to catch all *successful* transactions sent to one of the accounts from the list.
 /// In the demo we'll just look for them and log them but it might and probably should be extended based on your needs.

-fn main() {
-    // We use it to automatically search the for root certificates to perform HTTPS calls
-    // (sending telemetry and downloading genesis)
-    openssl_probe::init_ssl_cert_env_vars();
+#[tokio::main]
+async fn main() -> Result<(), tokio::io::Error> {
     init_logging();

     let opts: Opts = Opts::parse();

-    let home_dir = opts.home_dir.unwrap_or_else(near_indexer::get_default_home);
+    let config: LakeConfig = opts.clone().into();

-    match opts.subcmd {
-        SubCommand::Run(args) => {
-            // Create the Vec of AccountId from the provided ``--accounts`` to pass it to `listen_blocks`
-            let watching_list = args
-                .accounts
-                .split(',')
-                .map(|elem| {
-                    near_indexer::near_primitives::types::AccountId::from_str(elem)
-                        .expect("AccountId is invalid")
-                })
-                .collect();
-
-            // Inform about indexer is being started and what accounts we're watching for
-            eprintln!(
-                "Starting indexer transaction watcher for accounts: \n {:#?}",
-                &args.accounts
-            );
-
-            // Instantiate IndexerConfig with hardcoded parameters
-            let indexer_config = near_indexer::IndexerConfig {
-                home_dir,
-                sync_mode: near_indexer::SyncModeEnum::FromInterruption,
-                await_for_node_synced: near_indexer::AwaitForNodeSyncedEnum::WaitForFullSync,
-            };
+    let (_, stream) = near_lake_framework::streamer(config);

-            // Boilerplate code to start the indexer itself
-            let sys = actix::System::new();
-            sys.block_on(async move {
-                eprintln!("Actix");
-                let indexer = near_indexer::Indexer::new(indexer_config);
-                let stream = indexer.streamer();
-                actix::spawn(listen_blocks(stream, watching_list));
-            });
-            sys.run().unwrap();
-        }
-        SubCommand::Init(config) => near_indexer::indexer_init_configs(&home_dir, config.into()),
-    }
+    let watching_list = opts
+        .accounts
+        .split(',')
+        .map(|elem| {
+            near_indexer_primitives::types::AccountId::from_str(elem).expect("AccountId is invalid")
+        })
+        .collect();
+
+    listen_blocks(stream, watching_list).await;
+
+    Ok(())
 }

 /// The main listener function the will be reading the stream of blocks `StreamerMessage`
 /// and perform necessary checks
 async fn listen_blocks(
-    mut stream: mpsc::Receiver<near_indexer::StreamerMessage>,
-    watching_list: Vec<near_indexer::near_primitives::types::AccountId>,
+    mut stream: mpsc::Receiver<near_indexer_primitives::StreamerMessage>,
+    watching_list: Vec<near_indexer_primitives::types::AccountId>,
 ) {
     eprintln!("listen_blocks");
     // This will be a map of correspondence between transactions and receipts
@@ -120,7 +97,7 @@
                         &execution_outcome.receipt.receiver_id,
                         execution_outcome.execution_outcome.outcome.status
                     );
-                    if let near_indexer::near_primitives::views::ReceiptEnumView::Action {
+                    if let near_indexer_primitives::views::ReceiptEnumView::Action {
                         signer_id,
                         ..
                     } = &execution_outcome.receipt.receipt
@@ -128,19 +105,20 @@
                         eprintln!("{}", signer_id);
                     }

-                    if let near_indexer::near_primitives::views::ReceiptEnumView::Action {
-                        actions,
-                        ..
+                    if let near_indexer_primitives::views::ReceiptEnumView::Action {
+                        actions, ..
                     } = execution_outcome.receipt.receipt
                     {
                         for action in actions.iter() {
-                            if let near_indexer::near_primitives::views::ActionView::FunctionCall {
+                            if let near_indexer_primitives::views::ActionView::FunctionCall {
                                 args,
                                 ..
                             } = action
                             {
                                 if let Ok(decoded_args) = base64::decode(args) {
-                                    if let Ok(args_json) = serde_json::from_slice::<serde_json::Value>(&decoded_args) {
+                                    if let Ok(args_json) =
+                                        serde_json::from_slice::<serde_json::Value>(&decoded_args)
+                                    {
                                         eprintln!("{:#?}", args_json);
                                     }
                                 }
@@ -156,8 +134,8 @@
 }

 fn is_tx_receiver_watched(
-    tx: &near_indexer::IndexerTransactionWithOutcome,
-    watching_list: &[near_indexer::near_primitives::types::AccountId],
+    tx: &near_indexer_primitives::IndexerTransactionWithOutcome,
+    watching_list: &[near_indexer_primitives::types::AccountId],
 ) -> bool {
     watching_list.contains(&tx.transaction.receiver_id)
 }
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