Crate prom_mock_rs 

Prometheus Mock Library

A library for creating mock Prometheus HTTP API servers for integration testing.

This library provides components for:

• Fixture-based API Mock: Returns predefined responses from YAML fixtures
• Remote Write Sink: Accepts remote write data and stores it in memory for querying
• Label Matching: Extensible label filtering for time series queries
• In-Memory Storage: Fast storage backend for metrics data

Examples

use std::sync::Arc;
use prom_mock_rs::{MemoryStorage, SimpleQueryEngine, http::build_router};

// Create storage and query engine
let storage = Arc::new(MemoryStorage::new());
let engine = SimpleQueryEngine::new(storage.clone());

// Build HTTP router with state
let state = prom_mock_rs::http::AppState::builder()
    .with_storage(storage)
    .build()?;
let app = build_router(state);

Re-exports

pub use fixtures::FixtureBook;

pub use matchers::EqualMatcher;

pub use matchers::LabelMatcher;

pub use matchers::NotEqualMatcher;

pub use matchers::NotRegexMatcher;

pub use matchers::RegexMatcher;

pub use query_engine::SimpleQueryEngine;

pub use storage::Label;

pub use storage::MemoryStorage;

pub use storage::Sample;

pub use storage::Storage;

pub use storage::TimeSeries;

Modules

fixtures

Fixture definitions for predefined API responses and route matching.

http

HTTP server with Prometheus-compatible API endpoints and configurable mock behavior.

matchers

Label matching implementations for filtering time series.

query_engine

Simple query engine for basic metric selectors without full PromQL.

storage

Time series storage implementations and abstractions.

timeutil

Time utilities for parsing relative time expressions.