fix(tee-prover): fix deserialization of std::time::Duration in `env…

…y` config (#2817)

## What ❔

This PR fixes the deserialization issue of `std::time::Duration` in the
`envy` configuration.

Relevant logs from the `stage` environment showcasing the issue:
https://grafana.matterlabs.dev/goto/IC-9k4eIR?orgId=1

Error message from the above logs:
```
Error: missing value for field initial_retry_backoff
```

The root cause of the problem supposedly boils down to the mismatch
between the expected format of `TEE_PROVER_INITIAL_RETRY_BACKOFF` and
the actual format. We export it as follows:
```
export TEE_PROVER_INITIAL_RETRY_BACKOFF=1
```
which is not supported as explained here:
serde-rs/serde#339 (comment)

## Why ❔

To fix the bug.

## Checklist

- [x] PR title corresponds to the body of PR (we generate changelog
entries from PRs).
- [ ] Tests for the changes have been added / updated.
- [ ] Documentation comments have been added / updated.
- [x] Code has been formatted via `zk fmt` and `zk lint`.

core/bin/zksync_tee_prover/src/config.rs

@@ -22,11 +22,21 @@ pub(crate) struct TeeProverConfig {
     pub max_retries: usize,
     /// Initial back-off interval when retrying recovery on a retriable error. Each subsequent retry interval
     /// will be multiplied by [`Self.retry_backoff_multiplier`].
-    pub initial_retry_backoff: Duration,
+    pub initial_retry_backoff_sec: u64,
     /// Multiplier for the back-off interval when retrying recovery on a retriable error.
     pub retry_backoff_multiplier: f32,
     /// Maximum back-off interval when retrying recovery on a retriable error.
-    pub max_backoff: Duration,
+    pub max_backoff_sec: u64,
+}
+
+impl TeeProverConfig {
+    pub fn initial_retry_backoff(&self) -> Duration {
+        Duration::from_secs(self.initial_retry_backoff_sec)
+    }
+
+    pub fn max_backoff(&self) -> Duration {
+        Duration::from_secs(self.max_backoff_sec)
+    }
 }
 
 impl FromEnv for TeeProverConfig {
@@ -39,9 +49,9 @@ impl FromEnv for TeeProverConfig {
     /// export TEE_PROVER_TEE_TYPE="sgx"
     /// export TEE_PROVER_API_URL="http://127.0.0.1:3320"
     /// export TEE_PROVER_MAX_RETRIES=10
-    /// export TEE_PROVER_INITIAL_RETRY_BACKOFF=1
+    /// export TEE_PROVER_INITIAL_RETRY_BACKOFF_SEC=1
     /// export TEE_PROVER_RETRY_BACKOFF_MULTIPLIER=2.0
-    /// export TEE_PROVER_MAX_BACKOFF=128
+    /// export TEE_PROVER_MAX_BACKOFF_SEC=128
     /// ```
     fn from_env() -> anyhow::Result<Self> {
         let config: Self = envy::prefixed("TEE_PROVER_").from_env()?;

core/bin/zksync_tee_prover/src/tee_prover.rs

@@ -129,7 +129,7 @@ impl Task for TeeProver {
             .await?;
 
         let mut retries = 1;
-        let mut backoff = config.initial_retry_backoff;
+        let mut backoff = config.initial_retry_backoff();
         let mut observer = METRICS.job_waiting_time.start();
 
         loop {
@@ -141,7 +141,7 @@ impl Task for TeeProver {
             let need_to_sleep = match result {
                 Ok(batch_number) => {
                     retries = 1;
-                    backoff = config.initial_retry_backoff;
+                    backoff = config.initial_retry_backoff();
                     if let Some(batch_number) = batch_number {
                         observer.observe();
                         observer = METRICS.job_waiting_time.start();
@@ -162,7 +162,7 @@ impl Task for TeeProver {
                     retries += 1;
                     backoff = std::cmp::min(
                         backoff.mul_f32(config.retry_backoff_multiplier),
-                        config.max_backoff,
+                        config.max_backoff(),
                     );
                     true
                 }