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Posted to commits@opendal.apache.org by "chitralverma (via GitHub)" <gi...@apache.org> on 2026/07/08 10:43:01 UTC
[I] Duration config fields cannot be set from the string config map [opendal]
chitralverma opened a new issue, #7887:
URL: https://github.com/apache/opendal/issues/7887
### Summary
`Duration`-typed config fields cannot be set from the string config map. Any
attempt to set one (via `Operator::via_iter`, `from_uri`, or a `Configurator`
built from a key/value map) fails with `invalid type: string, expected struct
Duration`. This is a core issue and is binding-agnostic — every binding routes
config through the same `ConfigDeserializer`.
### Root cause
Config fields are declared as plain `std::time::Duration` with the default
serde derive and no string-parsing attribute:
```rust
// core/services/redis/src/config.rs:62
pub default_ttl: Option<Duration>,
```
`serde`'s default `Duration` impl only deserializes from a `{ secs, nanos }`
struct. But `ConfigDeserializer` (core/core/src/raw/serde_util.rs) forwards
`struct` to `deserialize_any`, which hands back the raw string. So a string
value never matches the expected struct and deserialization fails.
There is no `#[serde(with = "humantime_serde")]` (or equivalent), and
`humantime` is not a dependency of these crates. The Python getter/docstring
that mention a "humantime string" are therefore misleading — no such parsing
happens.
### Affected fields
All `Duration`-typed config fields:
- `core/services/redis/src/config.rs:62` — `default_ttl`
- `core/services/memcached/src/config.rs:47` — `default_ttl`
- `core/services/cloudflare-kv/src/config.rs:37` — `default_ttl`
More broadly, **any** config field typed `Duration` hits this. Services that
need a duration currently work around it with a plain integer (e.g. S3's
`assume_role_duration_seconds: Option<u32>`), so `Duration` is effectively a
trap for any future config field.
### Steps to reproduce (core, Rust)
```rust
use std::collections::HashMap;
use opendal::Operator;
let mut opts = HashMap::new();
opts.insert("endpoint".into(), "tcp://127.0.0.1:6379".into());
opts.insert("db".into(), "0".into());
opts.insert("default_ttl".into(), "5s".into()); // any string fails
// Err: ConfigInvalid "failed to deserialize config",
// source: invalid type: string "5s", expected struct Duration
let _ = Operator::via_iter("redis", opts).unwrap();
```
The same failure occurs for `"5"`, `"100ms"`, `"0"`, etc. Only omitting the
field works. It reproduces identically from any binding (e.g. Python
`Operator("redis", default_ttl="5s")` or
`Operator.from_config(RedisConfig(..., default_ttl="5s"))`).
### Suggested fix
Add a string deserializer for `Duration` config fields in core, e.g.
`#[serde(with = "humantime_serde")]` (plus the `humantime`/`humantime-serde`
dependency), so values like `"5s"`, `"100ms"`, `"1m"` parse. This fixes every
binding at once. Bindings can then decide how to type the field (a humantime
string, and optionally a native duration type).
Note: a bare number like `"5"` (no unit) is not accepted by humantime and
should remain an error; only explicit-unit strings should be supported.
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Re: [I] Duration config fields cannot be set from the string config map [opendal]
Posted by "dosubot[bot] (via GitHub)" <gi...@apache.org>.
dosubot[bot] commented on issue #7887:
URL: https://github.com/apache/opendal/issues/7887#issuecomment-4914007464
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<!-- Answer -->
Good catch — you're right that `default_ttl` on Redis and Memcached is declared as `Option<Duration>` with no custom deserializer, which makes it impossible to set via string-based config maps [[1]](https://github.com/apache/opendal/blob/27d5677d4526519313cbce00cd28f8fbcc099642/core/src/services/redis/config.rs) [[2]](https://github.com/apache/opendal/blob/27d5677d4526519313cbce00cd28f8fbcc099642/core/src/services/memcached/config.rs).
OpenDAL already has a solution for this pattern, though it hasn't been applied to these older services yet. The [`signed_to_duration()`](https://github.com/apache/opendal/pull/6668) utility in `core/src/raw/time.rs` parses both ISO-8601 (`PT5S`) and friendly humantime-like formats (`5s`, `100ms`, `1m`) using `jiff::SignedDuration`. The established pattern (used in SFTP, for example) is to store the config field as `Option<String>` and parse it at build time via `signed_to_duration()` [[3]](https://github.com/apache/opendal/pull/7423):
```rust
// In config struct
pub default_ttl: Option<String>,
// In builder
let ttl = cfg.default_ttl
.map(|s| signed_to_duration(&s))
.transpose()?;
```
So the fix for Redis/Memcached/Cloudflare KV would be to change `default_ttl` from `Option<Duration>` to `Option<String>` in the config struct and parse it with `signed_to_duration()` in the builder — no new dependencies needed since `jiff` is already in core. This aligns with how the SFTP service handles its timeout fields.
Note that `humantime-serde` is only used in the CLI tool (`bin/oli`) [[4]](https://github.com/apache/opendal/blob/27d5677d4526519313cbce00cd28f8fbcc099642/bin/oli/Cargo.toml#L38), not in core, so the `#[serde(with = "humantime_serde")]` approach would add a new dependency. The `signed_to_duration()` approach is more idiomatic for OpenDAL.
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Re: [I] Duration config fields cannot be set from the string config map [opendal]
Posted by "tisonkun (via GitHub)" <gi...@apache.org>.
tisonkun closed issue #7887: Duration config fields cannot be set from the string config map
URL: https://github.com/apache/opendal/issues/7887
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