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basic implementation of read added

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This commit is contained in:
Falk Werner 2019-01-27 12:01:01 +01:00
parent 318b9afdf9
commit 59caed8600
6 changed files with 203 additions and 17 deletions
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66
src/app/www/script.js
View File

@ -4,7 +4,25 @@ function startup()
this.root = root;
};
FileSystem.BAD_NO_ENTRY = -1;
FileSystem.GOOD = 0;
FileSystem.BAD = 1;
FileSystem.BAD_NOTIMPLEMENTED = 2;
FileSystem.BAD_TIMEOUT = 3;
FileSystem.BAD_FORMAT = 4;
FileSystem.BAD_NOENTRY = 101;
FileSystem.BAD_NOACCESS = 102;
FileSystem.O_ACCMODE = 00003;
FileSystem.O_RDONLY = 00000;
FileSystem.O_WRONLY = 00001;
FileSystem.O_RDWR = 00002;
FileSystem.O_CREAT = 00100;
FileSystem.O_EXCL = 00200;
FileSystem.O_TRUNK = 01000;
FileSystem.O_APPEND = 02000;
FileSystem.prototype.getEntry = function(path) {
var items = path.split('/');
@ -28,14 +46,14 @@ function startup()
return {
mode: entry.mode || 0755,
type: entry.type || 'file',
size: entry.size || 0,
size: entry.size || (entry.contents && entry.contents.length) || 0,
atime: entry.atime || 0,
mtime: entry.mtime || 0,
ctime: entry.ctime || 0
};
}
else {
return FileSystem.BAD_NO_ENTRY;
return FileSystem.BAD_NOENTRY;
}
};
@ -52,17 +70,45 @@ function startup()
}
}
else {
result = FileSystem.BAD_NO_ENTRY;
result = FileSystem.BAD_NOENTRY;
}
return result;
};
FileSystem.prototype.open = function(path, mode) {
var result = FileSystem.BAD_NOENTRY;
var entry = this.getEntry(path);
if (entry.type == "file") {
result = ((mode & FileSystem.O_ACCMODE) == FileSystem.O_RDONLY) ? true : FileSystem.BAD_NOACCESS;
}
return result;
};
FileSystem.prototype.read = function(path, offset, length) {
var result = FileSystem.BAD_NOENTRY;
var entry = this.getEntry(path);
if (entry.type == "file") {
var end = Math.min(offset + length, entry.contents.length);
var data = (offset < entry.contents.length) ? entry.contents.substring(offset, end) : "";
result = {
data: data,
format: "identity",
count: data.length
};
}
return result;
};
var fs = new FileSystem({
mode: 0755,
type: "dir",
entries: {
"hello": { mode: 0755, type: "file", size: 10, contents: "Hello, World!"}
"hello": { mode: 0755, type: "file", /* size: 10 , */contents: "Hello, World!"}
}
});
@ -74,13 +120,13 @@ function startup()
console.log('close');
};
ws.onmessage = function(message) {
console.log(message);
try {
var request = JSON.parse(message.data);
var result = -42;
var response;
console.log(request);
if (("string" === typeof(request.method)) &&
("number" === typeof(request.id)) &&
(request.params)) {
@ -92,6 +138,12 @@ function startup()
case "readdir":
result = fs.readdir(request.params[0]);
break;
case "open":
result = fs.open(request.params[0], request.params[1]);
break;
case "read":
result = fs.read(request.params[0], request.params[1], request.params[2]);
break;
default:
break;
}
@ -106,7 +158,7 @@ function startup()
ws.send(JSON.stringify(response));
}
}
catch (ex) { console.log(ex); }
catch (ex) { console.log(ex, message); }
};
var sendButton = document.getElementById('sendButton');

90
src/wsfs/filesystem.c
View File

@ -69,13 +69,14 @@ wsfs_status wsfs_filesystem_getattr(
result->st_mode |= S_IFDIR;
}
result->st_size = wsfs_json_get_int(data, "size", 0);
result->st_atime = wsfs_json_get_int(data, "atime", 0);
result->st_mtime = wsfs_json_get_int(data, "mtime", 0);
result->st_ctime = wsfs_json_get_int(data, "ctime", 0);
}
else
{
status = WSFS_BAD_PARSEERROR;
status = WSFS_BAD_FORMAT;
}
@ -115,3 +116,90 @@ wsfs_status wsfs_filesystem_readdir(
return status;
}
wsfs_status wsfs_filesystem_open(
struct wsfs_filesystem * filesystem,
char const * path,
int flags)
{
json_t * result = NULL;
wsfs_status const status = wsfs_jsonrpc_invoke(filesystem->rpc, &result, "open", "si", path, flags);
if (NULL != result)
{
// unused
json_decref(result);
}
return status;
}
#define WSFS_MAX_READ_LENGTH 4096
static wsfs_status wsfs_fill_buffer(
char * buffer,
size_t buffer_size,
char const * format,
char const * data,
size_t count)
{
wsfs_status status = WSFS_GOOD;
size_t const copy_count = (buffer_size < count) ? buffer_size : count;
if (0 < copy_count)
{
if (0 == strcmp("identity", format))
{
memcpy(buffer, data, copy_count);
}
else
{
status = WSFS_BAD;
}
}
return status;
}
wsfs_status wsfs_filesystem_read(
struct wsfs_filesystem * filesystem,
char const * path,
char * buffer,
size_t buffer_size,
size_t offset,
size_t * read_count)
{
int const length = (buffer_size <= WSFS_MAX_READ_LENGTH) ? (int) buffer_size : WSFS_MAX_READ_LENGTH;
*read_count = 0;
json_t * result = NULL;
wsfs_status status = wsfs_jsonrpc_invoke(filesystem->rpc, &result, "read", "sii", path, (int) offset, length);
if (NULL != result)
{
json_t * data_holder = json_object_get(result, "data");
json_t * format_holder = json_object_get(result, "format");
json_t * count_holder = json_object_get(result, "count");
if ((NULL != data_holder) && (json_is_string(data_holder)) &&
(NULL != format_holder) && (json_is_string(format_holder)) &&
(NULL != count_holder) && (json_is_integer(count_holder)))
{
char const * const data = json_string_value(data_holder);
char const * const format = json_string_value(format_holder);
size_t const count = (size_t) json_integer_value(count_holder);
status = wsfs_fill_buffer(buffer, buffer_size, format, data, count);
if (WSFS_GOOD == status)
{
*read_count = count;
}
}
else
{
status = WSFS_BAD_FORMAT;
}
json_decref(result);
}
return status;
}

11
src/wsfs/filesystem.h
View File

@ -32,7 +32,18 @@ extern wsfs_status wsfs_filesystem_readdir(
void * buffer,
wsfs_add_entry_fn * add_entry);
extern wsfs_status wsfs_filesystem_open(
struct wsfs_filesystem * filesystem,
char const * path,
int flags);
extern wsfs_status wsfs_filesystem_read(
struct wsfs_filesystem * filesystem,
char const * path,
char * buffer,
size_t buffer_size,
size_t offset,
size_t * read_count);
#endif

35
src/wsfs/operations.c
View File

@ -19,6 +19,7 @@ static int wsfs_result_from_status(wsfs_status status)
{
case WSFS_GOOD: return 0;
case WSFS_BAD_NOENTRY: return -ENOENT;
case WSFS_BAD_NOACCESS: return -EACCES;
default: return -ENOENT;
}
}
@ -93,6 +94,38 @@ static int wsfs_operation_readdir(
return wsfs_result_from_status(status);
}
static int wsfs_operation_open(
char const *path,
struct fuse_file_info * file_info)
{
struct wsfs_filesystem * filesystem = wsfs_get_filesystem();
wsfs_status const status = wsfs_filesystem_open(filesystem, path, file_info->flags);
return wsfs_result_from_status(status);
}
static int wsfs_operation_read(
const char * path,
char * buffer,
size_t buffer_size,
off_t offset,
struct fuse_file_info * WSFS_UNUSED_PARAM(file_info))
{
struct wsfs_filesystem * filesystem = wsfs_get_filesystem();
size_t count;
wsfs_status const status = wsfs_filesystem_read(filesystem, path, buffer, buffer_size, offset, &count);
if (WSFS_GOOD == status)
{
return count;
}
else
{
return wsfs_result_from_status(status);
}
}
void wsfs_operations_init(
struct fuse_operations * operations)
{
@ -101,5 +134,7 @@ void wsfs_operations_init(
operations->destroy = &wsfs_operation_destroy;
operations->getattr = &wsfs_operation_getattr;
operations->readdir = &wsfs_operation_readdir;
operations->open = &wsfs_operation_open;
operations->read = &wsfs_operation_read;
}

6
src/wsfs/response_parser.c
View File

@ -12,14 +12,14 @@ void wsfs_response_parse(
json_t * response = json_loadb(buffer, length, 0, NULL);
if (NULL == response)
{
result->status = WSFS_BAD_PARSEERROR;
result->status = WSFS_BAD_FORMAT;
return;
}
json_t * id_holder = json_object_get(response, "id");
if ((NULL == id_holder) || (!json_is_integer(id_holder)))
{
result->status = WSFS_BAD_INVALIDID;
result->status = WSFS_BAD_FORMAT;
json_decref(response);
return;
}
@ -33,7 +33,7 @@ void wsfs_response_parse(
}
else
{
result->status = WSFS_BAD_NODATA;
result->status = WSFS_BAD_FORMAT;
json_t * error = json_object_get(response, "error");
if (NULL != error)

12
src/wsfs/status.h
View File

@ -2,14 +2,14 @@
#define _WSFS_STATUS_H
#define WSFS_GOOD 0
#define WSFS_BAD 1
#define WSFS_BAD 1
#define WSFS_BAD_NOTIMPLEMENTED 2
#define WSFS_BAD_TIMEOUT 3
#define WSFS_BAD_FORMAT 4
#define WSFS_BAD_NOENTRY 101
#define WSFS_BAD_TIMEOUT 102
#define WSFS_BAD_PARSEERROR 200
#define WSFS_BAD_INVALIDID 201
#define WSFS_BAD_NODATA 202
#define WSFS_BAD_NOACCESS 102
typedef int wsfs_status;