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Falk Werner
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README.md
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README.md
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fuse-wsfs combines libwebsockets and libfuse. It allows ot attach a remote filesystem via websockets.
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# Contents
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## Contents
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- [Workflow and API](#Workflow-and-API)
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- [Build and run](#Build-and-run)
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- [Dependencies](#Dependencies)
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# Workflow and API
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## Workflow and API
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+---------------------+ +-------------+ +------+
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| Filesystem Provider | | wsfs daemon | | user |
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@ -54,11 +54,11 @@ A reference implementation of such a daemon is provided within the examples. The
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Currently all requests are initiated by wsfs daemon and responded by filesystem provider. This may change in future, e.g. when authentication is supported.
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## Requests, responses and notifications
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### Requests, responses and notifications
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There are three types of messages, used for communication between wsfs daemon and filesystem provider. All message types are encoded in [JSON](https://www.json.org/) and strongly inspired by [JSON-RPC](https://www.jsonrpc.org/).
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### Request
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#### Request
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A request is used by a sender to invoke a method on the receiver. The sender awaits a response from the receiver. Since requests and responses can be sendet or answered in any order, an id is provided in each request to identify it.
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@ -74,11 +74,11 @@ A request is used by a sender to invoke a method on the receiver. The sender awa
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| params | array | method specific parameters |
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| id | integer | id, which is repeated in response |
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### Response
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#### Response
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A response is used to answer a prior request. There are two kinds of responses:
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#### Successful Results
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##### Successful Results
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{
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"result": <result>,
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@ -90,7 +90,7 @@ A response is used to answer a prior request. There are two kinds of responses:
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| result | any | request specific result |
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| id | integer | id, same as request |
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#### Error notifications
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##### Error notifications
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{
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"error": {
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@ -104,7 +104,7 @@ A response is used to answer a prior request. There are two kinds of responses:
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| code | integer | error code |
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| id | integer | id, same as request |
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#### Error codes
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##### Error codes
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| Symbolic name | Code | Description |
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| ------------------ | ---------:| ---------------------- |
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@ -117,7 +117,7 @@ A response is used to answer a prior request. There are two kinds of responses:
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| BAD_NOENTRY | 101 | invalid entry |
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| BAD_NOACCESS | 102 | access not allowed |
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### Notification
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#### Notification
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Notfications are used to inform a receiver about something. Unlike requests, notifications are not answered. Therefore, an id is not supplied.
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@ -131,9 +131,9 @@ Notfications are used to inform a receiver about something. Unlike requests, not
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| method_name | string | name of the method to invoke |
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| params | array | method specific parameters |
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## Requests
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### Requests
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### lookup
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#### lookup
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Retrieve information about a filesystem entry by name.
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@ -160,7 +160,7 @@ Retrieve information about a filesystem entry by name.
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| mtime | integer | optional; unix time of last modification |
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| ctime | intefer | optional; unix time of last metadata change |
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### getattr
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#### getattr
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Get file attributes.
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@ -184,7 +184,7 @@ Get file attributes.
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| mtime | integer | optional; unix time of last modification |
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| ctime | intefer | optional; unix time of last metadata change |
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### readdir
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#### readdir
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Read directory contents.
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Result is an array of name-inode pairs for each entry. The generic entries
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@ -202,7 +202,7 @@ Result is an array of name-inode pairs for each entry. The generic entries
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| name | integer | name of the entry |
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| inode | integer | inode of the entry |
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### open
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#### open
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Open a file.
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@ -215,7 +215,7 @@ Open a file.
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| flags | integer | access mode flags (see below) |
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| handle | integer | handle of the file |
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#### Flags
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##### Flags
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| Symbolic name | Code | Description |
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| --------------| ---------:| --------------------------- |
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@ -228,8 +228,7 @@ Open a file.
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| O_TRUNK | 0x200 | open file to trunkate |
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| O_APPEND | 0x400 | open file to append |
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### close
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#### close
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Informs filesystem provider, that a file is closed.
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Since `close` is a notification, it cannot fail.
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@ -242,7 +241,7 @@ Since `close` is a notification, it cannot fail.
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| handle | integer | handle of the file |
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| flags | integer | access mode flags (see open) |
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### read
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#### read
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Read from an open file.
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@ -263,14 +262,14 @@ Read from an open file.
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| format | string | Encoding of data (see below) |
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| count | integer | Actual number of bytes read |
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#### Format
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##### Format
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| Format | Description |
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| ---------- | -------------------------------------------------------- |
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| "identiy" | Use data as is; note that JSON strings are UTF-8 encoded |
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| "base64" | data is base64 encoded |
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# Build and run
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## Build and run
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To install dependencies, see below.
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@ -282,16 +281,16 @@ To install dependencies, see below.
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./wsfs -m test --document_root=../exmaple/www --port=4711
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# Dependencies
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## Dependencies
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- [libfuse3](https://github.com/libfuse/libfuse/)
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- [libwebsockets](https://libwebsockets.org/)
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- [Jansson](https://jansson.readthedocs.io)
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- [GoogleTest](https://github.com/google/googletest) *(optional)*
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## Installation
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### Installation
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### libfuse
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#### libfuse
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wget -O fuse-3.1.1.tar.gz https://github.com/libfuse/libfuse/archive/fuse-3.1.1.tar.gz
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tar -xf fuse-3.1.1.tar.gz
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@ -301,7 +300,7 @@ To install dependencies, see below.
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make
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sudo make install
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### libwebsockets
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#### libwebsockets
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wget -O libwebsockets-3.1.0.tar.gz https://github.com/warmcat/libwebsockets/archive/v3.1.0.tar.gz
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tar -xf libwebsockets-3.1.0.tar.gz
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@ -312,7 +311,7 @@ To install dependencies, see below.
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make
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sudo make install
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### Jansson
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#### Jansson
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On many systems, libjansson can installed via apt:
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@ -329,7 +328,7 @@ Otherwise, it can be installed from source:
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make
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sudo make install
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### GoogleTest
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#### GoogleTest
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Installation of GoogleTest is optional fuse-wsfs library, but required to compile tests.
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@ -341,5 +340,3 @@ Installation of GoogleTest is optional fuse-wsfs library, but required to compil
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cmake ..
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make
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sudo make install
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