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Implement synchronization protocol from PROTOCOL.txt

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Updated both client.c and metadata_server.c to match the protocol
specification in misc/PROTOCOL.txt:

Client-to-Server Messages:
- Added expect_gen field to DELETE, LIST, READ, and WRITE messages
- Removed old_hash and chunk_size from WRITE message chunks

Server-to-Client Responses:
- Added generation counter to CREATE_SUCCESS response
- Added generation counter to LIST_SUCCESS response
- Fixed LIST_SUCCESS field order (gen, truncated, item_count)
- Added generation counter to READ_SUCCESS response
- Added generation counter to WRITE_SUCCESS response

All changes compile successfully and pass valgrind memory checks.
This commit is contained in:
Claude
2025-11-24 12:16:55 +00:00
parent 49091aff6d
commit acb1336d47
2 changed files with 82 additions and 37 deletions
Download Patch File Download Diff File Expand all files Collapse all files
src/client.c
+58 -13
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@@ -617,11 +617,13 @@ ToastyHandle toasty_begin_delete(ToastyFS *toasty, ToastyString path)
opidx = -1;
goto unlock_and_exit;
}
uint16_t tmp = path.len;
uint16_t path_len = path.len;
uint64_t expect_gen = 0; // 0 means skip generation check
MessageWriter writer;
metadata_server_request_start(toasty, &writer, MESSAGE_TYPE_DELETE);
message_write(&writer, &tmp, sizeof(tmp));
message_write(&writer, &expect_gen, sizeof(expect_gen));
message_write(&writer, &path_len, sizeof(path_len));
message_write(&writer, path.ptr, path.len);
if (metadata_server_request_end(toasty, &writer, opidx, 0) < 0) {
free_operation(toasty, opidx);
@@ -659,11 +661,13 @@ ToastyHandle toasty_begin_list(ToastyFS *toasty, ToastyString path)
opidx = -1;
goto unlock_and_exit;
}
uint16_t tmp = path.len;
uint16_t path_len = path.len;
uint64_t expect_gen = 0; // 0 means skip generation check
MessageWriter writer;
metadata_server_request_start(toasty, &writer, MESSAGE_TYPE_LIST);
message_write(&writer, &tmp, sizeof(tmp));
message_write(&writer, &expect_gen, sizeof(expect_gen));
message_write(&writer, &path_len, sizeof(path_len));
message_write(&writer, path.ptr, path.len);
if (metadata_server_request_end(toasty, &writer, opidx, 0) < 0) {
free_operation(toasty, opidx);
@@ -687,9 +691,11 @@ static int send_read_message(ToastyFS *toasty, int opidx, int tag, ToastyString
if (path.len > UINT16_MAX)
return -1;
uint16_t path_len = path.len;
uint64_t expect_gen = 0; // 0 means skip generation check
MessageWriter writer;
metadata_server_request_start(toasty, &writer, MESSAGE_TYPE_READ);
message_write(&writer, &expect_gen, sizeof(expect_gen));
message_write(&writer, &path_len, sizeof(path_len));
message_write(&writer, path.ptr, path.len);
message_write(&writer, &offset, sizeof(offset));
@@ -813,6 +819,13 @@ static void process_event_for_create(ToastyFS *toasty,
return;
}
// Read generation counter
uint64_t gen;
if (!binary_read(&reader, &gen, sizeof(gen))) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_CREATE_ERROR, .user=toasty->operations[opidx].user };
return;
}
// Check there is nothing else to read
if (binary_read(&reader, NULL, 1)) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_CREATE_ERROR, .user=toasty->operations[opidx].user };
@@ -901,19 +914,26 @@ static void process_event_for_list(ToastyFS *toasty,
return;
}
// Read and validate the list data
uint32_t item_count;
if (!binary_read(&reader, &item_count, sizeof(item_count))) {
// Read generation counter
uint64_t gen;
if (!binary_read(&reader, &gen, sizeof(gen))) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_LIST_ERROR, .user=toasty->operations[opidx].user };
return;
}
// Read and validate the list data
uint8_t truncated;
if (!binary_read(&reader, &truncated, sizeof(truncated))) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_LIST_ERROR, .user=toasty->operations[opidx].user };
return;
}
uint32_t item_count;
if (!binary_read(&reader, &item_count, sizeof(item_count))) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_LIST_ERROR, .user=toasty->operations[opidx].user };
return;
}
ToastyListingEntry *entities = sys_malloc(item_count * sizeof(ToastyListingEntry));
if (entities == NULL) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_LIST_ERROR, .user=toasty->operations[opidx].user };
@@ -1000,6 +1020,13 @@ static void process_event_for_read(ToastyFS *toasty,
return;
}
// Read generation counter
uint64_t gen;
if (!binary_read(&reader, &gen, sizeof(gen))) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_READ_ERROR, .user=toasty->operations[opidx].user };
return;
}
// Read chunk size
uint32_t chunk_size;
if (!binary_read(&reader, &chunk_size, sizeof(chunk_size))) {
@@ -1429,6 +1456,13 @@ static void process_event_for_write(ToastyFS *toasty,
return;
}
// Read generation counter
uint64_t gen;
if (!binary_read(&reader, &gen, sizeof(gen))) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_WRITE_ERROR, .user=toasty->operations[opidx].user };
return;
}
uint32_t chunk_size;
if (!binary_read(&reader, &chunk_size, sizeof(chunk_size))) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_WRITE_ERROR, .user=toasty->operations[opidx].user };
@@ -1436,6 +1470,12 @@ static void process_event_for_write(ToastyFS *toasty,
}
toasty->operations[opidx].chunk_size = chunk_size;
// Skip file_length field that comes after chunk_size
if (!binary_read(&reader, NULL, sizeof(uint32_t))) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_WRITE_ERROR, .user=toasty->operations[opidx].user };
return;
}
uint32_t num_hashes;
if (!binary_read(&reader, &num_hashes, sizeof(num_hashes))) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_WRITE_ERROR, .user=toasty->operations[opidx].user };
@@ -1921,21 +1961,19 @@ static void process_event_for_write(ToastyFS *toasty,
assert(0); // TODO
}
uint16_t path_len = path.len;
uint64_t expect_gen = 0; // 0 means skip generation check - but per protocol, WRITE can't use 0
uint32_t num_chunks = num_upload_results;
uint32_t chunk_size = toasty->operations[opidx].chunk_size;
message_write(&writer, &expect_gen, sizeof(expect_gen));
message_write(&writer, &path_len, sizeof(path_len));
message_write(&writer, path.ptr, path.len);
message_write(&writer, &offset, sizeof(offset));
message_write(&writer, &length, sizeof(length));
message_write(&writer, &num_chunks, sizeof(num_chunks));
message_write(&writer, &chunk_size, sizeof(chunk_size));
for (int i = 0; i < num_upload_results; i++) {
// TODO: newly create chunks don't have an old hash
message_write(&writer, &upload_results[i].old_hash, sizeof(upload_results[i].old_hash));
message_write(&writer, &upload_results[i].new_hash, sizeof(upload_results[i].new_hash));
uint32_t tmp = upload_results[i].num_locations;
@@ -1984,12 +2022,19 @@ static void process_event_for_write(ToastyFS *toasty,
return;
}
if (binary_read(&reader, NULL, 1)) {
if (type != MESSAGE_TYPE_WRITE_SUCCESS) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_WRITE_ERROR, .user=toasty->operations[opidx].user };
return;
}
if (type != MESSAGE_TYPE_WRITE_SUCCESS) {
// Read generation counter
uint64_t gen;
if (!binary_read(&reader, &gen, sizeof(gen))) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_WRITE_ERROR, .user=toasty->operations[opidx].user };
return;
}
if (binary_read(&reader, NULL, 1)) {
toasty->operations[opidx].result = (ToastyResult) { .type=TOASTY_RESULT_WRITE_ERROR, .user=toasty->operations[opidx].user };
return;
}