libeasystorage

A simplified, higher-level C wrapper around libstorage. Includes examples showing how to implement simple filesharing apps.

Prerequisites

• CMake 3.14+
• C11 compiler
• libstorage (build or get binary from logos-storage-nim)

Building

cmake -B build -DLOGOS_STORAGE_NIM_ROOT=/path/to/logos-storage-nim -DCOMPILE_TUTORIAL_EXAMPLES=1
cmake --build build

This produces three example executables:

• storageconsole — interactive CLI for managing a storage node
• uploader — uploads a local file and prints the CID and SPR
• downloader — downloads a file given a bootstrap SPR and CID

API

#include "easystorage.h"

// Create and start a node
node_config cfg = {
    .api_port = 8080,
    .disc_port = 9090,
    .data_dir = "./data",
    .log_level = "INFO",
    .bootstrap_node = "<SPR>",
    .nat = "auto"
};
STORAGE_NODE node = e_storage_new(cfg);
e_storage_start(node);

// Get the node's Signed Peer Record
char *spr = e_storage_spr(node);
free(spr);

// Upload a file
char *cid = e_storage_upload(node, "/path/to/file.txt", progress_cb);
// Download a file
e_storage_download(node, cid, "/path/to/output.txt", progress_cb);
free(cid);

// Cleanup
e_storage_stop(node);
e_storage_destroy(node);

Configuration can also be loaded from an INI file:

[easystorage]
api-port=8080
disc-port=9090
data-dir=./data
log-level=INFO
bootstrap-node=spr:...
nat=none

node_config cfg = {0};
e_storage_read_config("config.ini", &cfg);
// ... use cfg ...
e_storage_free_config(&cfg);

Examples

storageconsole

An interactive CLI included in examples/storageconsole.c:

./build/storageconsole

Commands: help, start, stop, upload, download, quit.

uploader / downloader

Standalone programs that demonstrate file sharing between two nodes.

Optionally generate a file to upload. For example, using dd on nix-based systems:

# generate a 500MB file with random contents
dd if=/dev/urandom of=myfile.txt bs=1048576 count=500

In one terminal, start the uploader, passing in the path to a file to upload:

./build/uploader ./myfile.txt
# prints: Run: downloader <SPR> <CID> ./output-file

In another terminal, run the downloader with the printed values:

./build/downloader <SPR> <CID> ./output-file

Connecting to remote peers

To run the uploader/downloader example, but connect to peers remotely, the config will need to be updated before it will work.

UPnP / PMP

The easiest way to connect to remote peers is to enable UPnP or PMP in your router. Once this is enabled, update the config to:

// uploader.c
 node_config cfg = {
    .api_port = 8080,
    .disc_port = 9090,
    .data_dir = "./uploader-data",
    .log_level = "TRACE",
    .bootstrap_node = "spr:CiUIAhIhApIj9p6zJDRbw2NoCo-tj98Y760YbppRiEpGIE1yGaMzEgIDARpJCicAJQgCEiECkiP2nrMkNFvDY2gKj62P3xjvrRhumlGISkYgTXIZozMQvcz8wQYaCwoJBAWhF3WRAnVEGgsKCQQFoRd1kQJ1RCpGMEQCIFZB84O_nzPNuViqEGRL1vJTjHBJ-i5ZDgFL5XZxm4HAAiB8rbLHkUdFfWdiOmlencYVn0noSMRHzn4lJYoShuVzlw",
    .nat = "upnp" // or "pmp" or "any",
};

// downlaoder.c
node_config cfg = {
    .api_port = 8081,
    .disc_port = 9091,
    .data_dir = "./downloader-data",
    .log_level = "TRACE",
    .bootstrap_node = "spr:CiUIAhIhApIj9p6zJDRbw2NoCo-tj98Y760YbppRiEpGIE1yGaMzEgIDARpJCicAJQgCEiECkiP2nrMkNFvDY2gKj62P3xjvrRhumlGISkYgTXIZozMQvcz8wQYaCwoJBAWhF3WRAnVEGgsKCQQFoRd1kQJ1RCpGMEQCIFZB84O_nzPNuViqEGRL1vJTjHBJ-i5ZDgFL5XZxm4HAAiB8rbLHkUdFfWdiOmlencYVn0noSMRHzn4lJYoShuVzlw",
    .nat = "upnp" // or "pmp" or "any",
};

By specifying a common bootstrap node, the uploader and downloader will be able to share DHT entries. Specifically, the uploader will announce itself as a provider for the CID in the DHT to its closes neighbours (the bootstrap node), and the downloader will be able to traverse its closest peers when finding a provider for the CID.

Connecting to peers on the same network or machine

To connect to peers locally, the same config updates need to be made, except now, nat should be set to none:

// uploader.c
 node_config cfg = {
    .api_port = 8080,
    .disc_port = 9090,
    .data_dir = "./uploader-data",
    .log_level = "TRACE",
    .bootstrap_node = "spr:CiUIAhIhApIj9p6zJDRbw2NoCo-tj98Y760YbppRiEpGIE1yGaMzEgIDARpJCicAJQgCEiECkiP2nrMkNFvDY2gKj62P3xjvrRhumlGISkYgTXIZozMQvcz8wQYaCwoJBAWhF3WRAnVEGgsKCQQFoRd1kQJ1RCpGMEQCIFZB84O_nzPNuViqEGRL1vJTjHBJ-i5ZDgFL5XZxm4HAAiB8rbLHkUdFfWdiOmlencYVn0noSMRHzn4lJYoShuVzlw",
    .nat = "none"
};

// downlaoder.c
node_config cfg = {
    .api_port = 8081,
    .disc_port = 9091,
    .data_dir = "./downloader-data",
    .log_level = "TRACE",
    .bootstrap_node = "spr:CiUIAhIhApIj9p6zJDRbw2NoCo-tj98Y760YbppRiEpGIE1yGaMzEgIDARpJCicAJQgCEiECkiP2nrMkNFvDY2gKj62P3xjvrRhumlGISkYgTXIZozMQvcz8wQYaCwoJBAWhF3WRAnVEGgsKCQQFoRd1kQJ1RCpGMEQCIFZB84O_nzPNuViqEGRL1vJTjHBJ-i5ZDgFL5XZxm4HAAiB8rbLHkUdFfWdiOmlencYVn0noSMRHzn4lJYoShuVzlw",
    .nat = "none"
};

Testing

cmake --build build
ctest --test-dir build

Tests use a mock libstorage implementation and do not require a running storage node.

Project Structure

├── easystorage.h             # Public API
├── easystorage.c             # Implementation
├── CMakeLists.txt
├── examples/
│   ├── storageconsole.c      # Interactive CLI
│   ├── uploader.c            # File upload example
│   └── downloader.c          # File download example
├── tests/
│   ├── test_runner.c         # Unit tests
│   └── mock_libstorage.c     # Mock libstorage for testing
└── vendor/
    └── inih/                 # Vendored INI file parser

License

Dual-licensed under Apache 2.0 and MIT.