Implement the syncing with all validators functionality. (#4558)

## Motivation

In operations, it is useful to be able to sync with all validators in
one single operation.

Fixes #4488 

## Proposal

The implementation is straightforward.

## Test Plan

The CI.
I did test with README.md kind of files and added a `linera
sync-all-validators` function. And it does access to the validators
without error.
I did not test that the syncing does happen, though.

I created issue #4535 that shows some idea for improving the syncing
with validators.

## Release Plan

Fully compatible with existing DevNet / TestNet.

## Links

None.

Author: MathieuDutSik

CLI.md

@@ -20,6 +20,7 @@ This document contains the help content for the `linera` command-line program.
 * [`linera query-validator`↴](#linera-query-validator)
 * [`linera query-validators`↴](#linera-query-validators)
 * [`linera sync-validator`↴](#linera-sync-validator)
+* [`linera sync-all-validators`↴](#linera-sync-all-validators)
 * [`linera set-validator`↴](#linera-set-validator)
 * [`linera remove-validator`↴](#linera-remove-validator)
 * [`linera revoke-epochs`↴](#linera-revoke-epochs)
@@ -87,6 +88,7 @@ Client implementation and command-line tool for the Linera blockchain
 * `query-validator` — Show the version and genesis config hash of a new validator, and print a warning if it is incompatible. Also print some information about the given chain while we are at it
 * `query-validators` — Show the current set of validators for a chain. Also print some information about the given chain while we are at it
 * `sync-validator` — Synchronizes a validator with the local state of chains
+* `sync-all-validators` — Synchronizes all validators with the local state of chains
 * `set-validator` — Add or modify a validator (admin only)
 * `remove-validator` — Remove a validator (admin only)
 * `revoke-epochs` — Deprecates all committees up to and including the specified one
@@ -440,6 +442,18 @@ Synchronizes a validator with the local state of chains
 
 
 
+## `linera sync-all-validators`
+
+Synchronizes all validators with the local state of chains
+
+**Usage:** `linera sync-all-validators [OPTIONS]`
+
+###### **Options:**
+
+* `--chains <CHAINS>` — The chains to synchronize, or the default chain if empty
+
+
+
 ## `linera set-validator`
 
 Add or modify a validator (admin only)

linera-service/src/cli/command.rs

@@ -352,6 +352,13 @@ pub enum ClientCommand {
         chains: Vec<ChainId>,
     },
 
+    /// Synchronizes all validators with the local state of chains.
+    SyncAllValidators {
+        /// The chains to synchronize, or the default chain if empty.
+        #[arg(long, num_args = 0..)]
+        chains: Vec<ChainId>,
+    },
+
     /// Add or modify a validator (admin only)
     SetValidator {
         /// The public key of the validator.
@@ -969,6 +976,7 @@ impl ClientCommand {
             | ClientCommand::QueryValidator { .. }
             | ClientCommand::QueryValidators { .. }
             | ClientCommand::SyncValidator { .. }
+            | ClientCommand::SyncAllValidators { .. }
             | ClientCommand::SetValidator { .. }
             | ClientCommand::RemoveValidator { .. }
             | ClientCommand::ResourceControlPolicy { .. }

linera-service/src/cli/main.rs

@@ -544,6 +544,7 @@ impl Runnable for Job {
                 address,
                 mut chains,
             } => {
+                let time_start = Instant::now();
                 let context = ClientContext::new(
                     storage,
                     options.context_options.clone(),
@@ -562,6 +563,55 @@ impl Runnable for Job {
 
                     Box::pin(chain.sync_validator(validator.clone())).await?;
                 }
+                let time_total = time_start.elapsed();
+                info!(
+                    "Syncing with validator {address} in {} ms",
+                    time_total.as_millis()
+                );
+            }
+
+            SyncAllValidators { mut chains } => {
+                let time_start = Instant::now();
+                let context = Arc::new(ClientContext::new(
+                    storage,
+                    options.context_options.clone(),
+                    wallet,
+                    signer.into_value(),
+                ));
+
+                if chains.is_empty() {
+                    chains.push(context.default_chain());
+                }
+
+                let committee = context.wallet().genesis_config().committee.clone();
+
+                // Parallelize the validator loop - sync all validators concurrently
+                let tasks = committee
+                    .validator_addresses()
+                    .map(|(_validator_name, network_address)| {
+                        let context = context.clone();
+                        let chains = chains.clone();
+                        async move {
+                            let validator =
+                                context.make_node_provider().make_node(network_address)?;
+                            // For each validator, sync all chains sequentially
+                            for chain_id in &chains {
+                                let chain = context.make_chain_client(*chain_id);
+                                Box::pin(chain.sync_validator(validator.clone())).await?;
+                            }
+                            anyhow::Result::<()>::Ok(())
+                        }
+                    })
+                    .collect::<Vec<_>>();
+
+                // Wait for all validator sync tasks to complete
+                futures::future::try_join_all(tasks).await?;
+
+                let time_total = time_start.elapsed();
+                info!(
+                    "Syncing with all validators in {} ms",
+                    time_total.as_millis()
+                );
             }
 
             command @ (SetValidator { .. }