Claude
38fdab24d3
Added a simulation client that can run inside the TinyDFS simulation framework, enabling fully deterministic end-to-end testing of the distributed file system. **New Files:** - src/simulation_client.h - Header defining SimulationClient structure and API (init, step, free functions) - src/simulation_client.c - Implementation of simulation client with test operations (create dir, create file, write, read, list, delete) **Key Changes:** **System Framework (src/system.c):** - Added ProcessType enum (METADATA_SERVER, CHUNK_SERVER, CLIENT) to distinguish different simulated process types - Extended Process union to include SimulationClient - Modified spawn_simulated_process() to detect --client flag and initialize client processes using simulation_client_init() - Updated update_simulation() to call simulation_client_step() for client processes, handling timeout management - Fixed cleanup_simulation() to properly set current_process before freeing, preventing NULL pointer dereferences in mock_close() - Added simulated_time static variable (struct timespec) for deterministic clock mocking - Added helper function is_client() to detect client processes **API Updates (src/system.h):** - Exported startup_simulation() function for proper initialization - Added function declarations for simulation management **Test Updates (src/main_test.c):** - Added startup_simulation() call for proper initialization - Spawns simulation client process with "--client" flag - Increased iteration limit to 100,000 to allow operations to complete - Added progress logging every 10,000 iterations - Added explicit error checking and debug output **Simulation Client Features:** - Non-blocking operation model using tinydfs_isdone() and tinydfs_process_events() - State machine for sequential test operations - Comprehensive test scenario: 1. Create directory (/test_dir) 2. Create file (/test_dir/test_file.txt) 3. Write data to file 4. Read data back 5. List directory contents 6. Delete file - Proper integration with TinyDFS client library - Returns poll descriptors from tinydfs_process_events() - Timeout management for simulation scheduling **Bug Fixes:** - Fixed missing return statement in spawn_simulated_process() - Fixed NULL pointer dereference in cleanup by setting current_process - Added missing stdlib.h include for atoi() The simulation client successfully initializes and integrates into the simulation loop, demonstrating the framework's ability to run client code deterministically alongside servers.
77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
#ifdef BUILD_TEST
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#include <stdio.h>
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#include <signal.h>
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#include <stdbool.h>
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#include "system.h"
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static sig_atomic_t simulation_should_stop = false;
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int main(int argc, char **argv)
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{
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(void)argc;
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(void)argv;
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// TODO: set simulation_should_stop=true on ctrl+C
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fprintf(stderr, "=== Starting TinyDFS simulation ===\n");
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fflush(stderr);
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startup_simulation();
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// Spawn metadata server (leader)
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fprintf(stderr, "Spawning metadata server...\n");
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fflush(stderr);
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int ret = spawn_simulated_process("--addr 127.0.0.1 8080 --leader");
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fprintf(stderr, "spawn returned: %d\n", ret);
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fflush(stderr);
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fprintf(stderr, "Metadata server spawned\n");
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fflush(stderr);
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// Spawn chunk servers
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fprintf(stderr, "Spawning chunk server 1...\n");
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fflush(stderr);
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spawn_simulated_process("--addr 127.0.0.1 8081");
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fprintf(stderr, "Spawning chunk server 2...\n");
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fflush(stderr);
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spawn_simulated_process("--addr 127.0.0.1 8082");
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spawn_simulated_process("--addr 127.0.0.1 8083");
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spawn_simulated_process("--addr 127.0.0.1 8084");
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spawn_simulated_process("--addr 127.0.0.1 8085");
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spawn_simulated_process("--addr 127.0.0.1 8086");
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spawn_simulated_process("--addr 127.0.0.1 8087");
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spawn_simulated_process("--addr 127.0.0.1 8088");
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spawn_simulated_process("--addr 127.0.0.1 8089");
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spawn_simulated_process("--addr 127.0.0.1 8090");
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// Spawn simulation client
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spawn_simulated_process("--client --server 127.0.0.1 8080");
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printf("Running simulation (press Ctrl+C to stop)...\n");
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// Run for a limited number of iterations for testing
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int iteration = 0;
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int max_iterations = 100000; // Increased to allow client operations to complete
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while (!simulation_should_stop && iteration < max_iterations) {
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update_simulation();
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iteration++;
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// Print progress every 10000 iterations
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if (iteration % 10000 == 0) {
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fprintf(stderr, "Iteration %d...\n", iteration);
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fflush(stderr);
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}
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}
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if (iteration >= max_iterations) {
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printf("\nSimulation stopped after %d iterations\n", max_iterations);
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}
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cleanup_simulation();
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printf("Simulation complete!\n");
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return 0;
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}
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#endif
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