rustev-contract 0.2.0

Rustev's versioned wire contract: documents, bounded parsing, canonical form and identities.
Documentation 
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//! The named parse limit sets of spec 002, 3.2.5. Each document type uses
//! exactly one of them through [`crate::Document::LIMITS`].

use crate::bounded::ParseLimits;

const KIB: usize = 1024;
const MIB: usize = 1024 * KIB;

/// Decision definitions.
pub const DEFINITION_V1: ParseLimits = ParseLimits {
    max_bytes: MIB,
    max_depth: 32,
    max_string_bytes: 64 * KIB,
    max_collection_len: 4096,
    max_total_values: 100_000,
    max_number_bytes: 40,
    allow_fractional_numbers: false,
};

/// Context snapshots.
pub const SNAPSHOT_V1: ParseLimits = ParseLimits {
    max_bytes: 4 * MIB,
    max_depth: 32,
    max_string_bytes: 256 * KIB,
    max_collection_len: 10_000,
    max_total_values: 500_000,
    max_number_bytes: 40,
    allow_fractional_numbers: false,
};

/// Backend descriptors and calibration artifacts.
pub const DESCRIPTOR_V1: ParseLimits = ParseLimits {
    max_bytes: 256 * KIB,
    max_depth: 16,
    max_string_bytes: 4 * KIB,
    max_collection_len: 1024,
    max_total_values: 20_000,
    max_number_bytes: 40,
    allow_fractional_numbers: false,
};

/// Backend outputs; masses, logits and scores are JSON numbers.
pub const BACKEND_OUTPUT_V1: ParseLimits = ParseLimits {
    max_bytes: MIB,
    max_depth: 8,
    max_string_bytes: 4 * KIB,
    max_collection_len: 4096,
    max_total_values: 50_000,
    max_number_bytes: 40,
    allow_fractional_numbers: true,
};

/// Compiled plans.
pub const PLAN_V1: ParseLimits = ParseLimits {
    max_bytes: 2 * MIB,
    max_depth: 32,
    max_string_bytes: 64 * KIB,
    max_collection_len: 4096,
    max_total_values: 200_000,
    max_number_bytes: 40,
    allow_fractional_numbers: false,
};

/// Judgments, evidence records and evaluation reports.
pub const RECORD_V1: ParseLimits = ParseLimits {
    max_bytes: 4 * MIB,
    max_depth: 32,
    max_string_bytes: 256 * KIB,
    max_collection_len: 10_000,
    max_total_values: 500_000,
    max_number_bytes: 40,
    allow_fractional_numbers: true,
};

/// Replay bundles and eval-owned documents (spec 004, 3.2 and 3.5).
pub const REPLAY_V1: ParseLimits = ParseLimits {
    max_bytes: 16 * MIB,
    max_depth: 48,
    max_string_bytes: 8 * MIB,
    max_collection_len: 10_000,
    max_total_values: 1_000_000,
    max_number_bytes: 40,
    allow_fractional_numbers: true,
};

/// Request identity documents: `REPLAY_V1` tightened to 4 MiB (spec 004,
/// 3.4.2). The projection inside still obeys the plan's own bound.
pub const REQUEST_V1: ParseLimits = ParseLimits {
    max_bytes: 4 * MIB,
    ..REPLAY_V1
};

/// The `rustev.remote/1` documents (spec 009, 3.10): descriptors inside a
/// describe answer, projections as strings, outputs as JSON numbers. A
/// transport also bounds what it reads by the negotiated maximum.
pub const REMOTE_V1: ParseLimits = ParseLimits {
    max_bytes: 4 * MIB,
    max_depth: 16,
    max_string_bytes: MIB,
    max_collection_len: 4096,
    max_total_values: 100_000,
    max_number_bytes: 40,
    allow_fractional_numbers: true,
};

/// Exchange records, `rustev.remote-exchange/1` (spec 009, 3.9.1): a fixed
/// maximum size, with free text cut to 256 bytes before escaping.
pub const EXCHANGE_V1: ParseLimits = ParseLimits {
    max_bytes: 512 * KIB,
    max_depth: 8,
    max_string_bytes: 2 * KIB,
    max_collection_len: 64,
    max_total_values: 4096,
    max_number_bytes: 40,
    allow_fractional_numbers: false,
};

/// Dynamic questions, `rustev.dynamic-question/1` (spec 019, 3.2): the
/// request's own bounds (128 KiB canonical, 64 KiB of context values) are
/// checked after this scan; the scan admits at most twice the canonical
/// bound in raw bytes, so whitespace and escapes cannot force an unbounded
/// allocation.
pub const DYNAMIC_QUESTION_V1: ParseLimits = ParseLimits {
    max_bytes: 256 * KIB,
    max_depth: 8,
    max_string_bytes: 128 * KIB,
    max_collection_len: 64,
    max_total_values: 4096,
    max_number_bytes: 40,
    allow_fractional_numbers: false,
};

/// Span lines, `rustev.trace/1` (spec 028, 3.10.1): at most 64 KiB per
/// line. An attribute value is at most 4 096 bytes before escaping, so a
/// string's raw length is bounded at six times that.
pub const TRACE_V1: ParseLimits = ParseLimits {
    max_bytes: 64 * KIB,
    max_depth: 8,
    max_string_bytes: 24 * KIB,
    max_collection_len: 1024,
    max_total_values: 20_000,
    max_number_bytes: 40,
    allow_fractional_numbers: true,
};