Display Nodes/Ports/Links obtained from pipewire server

Cargo.lock

@@ -1,5 +1,23 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+[[package]]
+name = "aho-corasick"
+version = "0.7.15"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7404febffaa47dac81aa44dba71523c9d069b1bdc50a77db41195149e17f68e5"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "ansi_term"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee49baf6cb617b853aa8d93bf420db2383fab46d314482ca2803b40d5fde979b"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "anyhow"
 version = "1.0.34"
@@ -29,7 +47,41 @@ dependencies = [
  "glib-sys",
  "gobject-sys",
  "libc",
- "system-deps",
+ "system-deps 1.3.2",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d9b39be18770d11421cdb1b9947a45dd3f37e93092cbf377614828a319d5fee8"
+dependencies = [
+ "hermit-abi",
+ "libc",
+ "winapi",
+]
+
+[[package]]
+name = "bindgen"
+version = "0.56.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2da379dbebc0b76ef63ca68d8fc6e71c0f13e59432e0987e508c1820e6ab5239"
+dependencies = [
+ "bitflags",
+ "cexpr",
+ "clang-sys",
+ "clap",
+ "env_logger",
+ "lazy_static",
+ "lazycell",
+ "log",
+ "peeking_take_while",
+ "proc-macro2",
+ "quote",
+ "regex",
+ "rustc-hash",
+ "shlex",
+ "which",
 ]
 
 [[package]]
@@ -61,7 +113,7 @@ checksum = "2ed2639b9ad5f1d6efa76de95558e11339e7318426d84ac4890b86c03e828ca7"
 dependencies = [
  "glib-sys",
  "libc",
- "system-deps",
+ "system-deps 1.3.2",
 ]
 
 [[package]]
@@ -70,12 +122,72 @@ version = "1.0.62"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f1770ced377336a88a67c473594ccc14eca6f4559217c34f64aac8f83d641b40"
 
+[[package]]
+name = "cexpr"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f4aedb84272dbe89af497cf81375129abda4fc0a9e7c5d317498c15cc30c0d27"
+dependencies = [
+ "nom",
+]
+
+[[package]]
+name = "cfg-if"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
+name = "clang-sys"
+version = "1.0.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0659001ab56b791be01d4b729c44376edc6718cf389a502e579b77b758f3296c"
+dependencies = [
+ "glob",
+ "libc",
+ "libloading",
+]
+
+[[package]]
+name = "clap"
+version = "2.33.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "37e58ac78573c40708d45522f0d80fa2f01cc4f9b4e2bf749807255454312002"
+dependencies = [
+ "ansi_term",
+ "atty",
+ "bitflags",
+ "strsim",
+ "textwrap",
+ "unicode-width",
+ "vec_map",
+]
+
 [[package]]
 name = "either"
 version = "1.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457"
 
+[[package]]
+name = "env_logger"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26ecb66b4bdca6c1409b40fb255eefc2bd4f6d135dab3c3124f80ffa2a9661e"
+dependencies = [
+ "atty",
+ "humantime",
+ "log",
+ "regex",
+ "termcolor",
+]
+
 [[package]]
 name = "futures"
 version = "0.3.8"
@@ -216,7 +328,7 @@ dependencies = [
  "glib-sys",
  "gobject-sys",
  "libc",
- "system-deps",
+ "system-deps 1.3.2",
 ]
 
 [[package]]
@@ -233,7 +345,7 @@ dependencies = [
  "libc",
  "pango-sys",
  "pkg-config",
- "system-deps",
+ "system-deps 1.3.2",
 ]
 
 [[package]]
@@ -266,7 +378,7 @@ dependencies = [
  "glib-sys",
  "gobject-sys",
  "libc",
- "system-deps",
+ "system-deps 1.3.2",
  "winapi",
 ]
 
@@ -312,9 +424,15 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c7e9b997a66e9a23d073f2b1abb4dbfc3925e0b8952f67efd8d9b6e168e4cdc1"
 dependencies = [
  "libc",
- "system-deps",
+ "system-deps 1.3.2",
 ]
 
+[[package]]
+name = "glob"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b919933a397b79c37e33b77bb2aa3dc8eb6e165ad809e58ff75bc7db2e34574"
+
 [[package]]
 name = "gobject-sys"
 version = "0.10.0"
@@ -323,7 +441,7 @@ checksum = "952133b60c318a62bf82ee75b93acc7e84028a093e06b9e27981c2b6fe68218c"
 dependencies = [
  "glib-sys",
  "libc",
- "system-deps",
+ "system-deps 1.3.2",
 ]
 
 [[package]]
@@ -335,6 +453,7 @@ dependencies = [
  "gio",
  "glib",
  "gtk",
+ "pipewire",
 ]
 
 [[package]]
@@ -380,7 +499,7 @@ dependencies = [
  "gobject-sys",
  "libc",
  "pango-sys",
- "system-deps",
+ "system-deps 1.3.2",
 ]
 
 [[package]]
@@ -392,6 +511,21 @@ dependencies = [
  "unicode-segmentation",
 ]
 
+[[package]]
+name = "hermit-abi"
+version = "0.1.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5aca5565f760fb5b220e499d72710ed156fdb74e631659e99377d9ebfbd13ae8"
+dependencies = [
+ "libc",
+]
+
+[[package]]
+name = "humantime"
+version = "2.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3c1ad908cc71012b7bea4d0c53ba96a8cba9962f048fa68d143376143d863b7a"
+
 [[package]]
 name = "itertools"
 version = "0.9.0"
@@ -401,18 +535,90 @@ dependencies = [
  "either",
 ]
 
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "lazycell"
+version = "1.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
+
 [[package]]
 name = "libc"
 version = "0.2.80"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "4d58d1b70b004888f764dfbf6a26a3b0342a1632d33968e4a179d8011c760614"
 
+[[package]]
+name = "libloading"
+version = "0.6.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e9367bdfa836b7e3cf895867f7a570283444da90562980ec2263d6e1569b16bc"
+dependencies = [
+ "cfg-if 1.0.0",
+ "winapi",
+]
+
+[[package]]
+name = "libspa"
+version = "0.1.0"
+source = "git+https://gitlab.freedesktop.org/gdesmott/pipewire-rs?branch=proxies#6560d4f769cc0d9937d6091f2f3eb298ef31cbfc"
+dependencies = [
+ "bitflags",
+ "libspa-sys",
+]
+
+[[package]]
+name = "libspa-sys"
+version = "0.1.0"
+source = "git+https://gitlab.freedesktop.org/gdesmott/pipewire-rs?branch=proxies#6560d4f769cc0d9937d6091f2f3eb298ef31cbfc"
+dependencies = [
+ "bindgen",
+ "system-deps 2.0.2",
+]
+
+[[package]]
+name = "log"
+version = "0.4.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4fabed175da42fed1fa0746b0ea71f412aa9d35e76e95e59b192c64b9dc2bf8b"
+dependencies = [
+ "cfg-if 0.1.10",
+]
+
 [[package]]
 name = "memchr"
 version = "2.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ee1c47aaa256ecabcaea351eae4a9b01ef39ed810004e298d2511ed284b1525"
 
+[[package]]
+name = "nix"
+version = "0.14.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c722bee1037d430d0f8e687bbdbf222f27cc6e4e68d5caf630857bb2b6dbdce"
+dependencies = [
+ "bitflags",
+ "cc",
+ "cfg-if 0.1.10",
+ "libc",
+ "void",
+]
+
+[[package]]
+name = "nom"
+version = "5.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ffb4262d26ed83a1c0a33a38fe2bb15797329c85770da05e6b828ddb782627af"
+dependencies = [
+ "memchr",
+ "version_check",
+]
+
 [[package]]
 name = "once_cell"
 version = "1.5.0"
@@ -443,9 +649,15 @@ dependencies = [
  "glib-sys",
  "gobject-sys",
  "libc",
- "system-deps",
+ "system-deps 1.3.2",
 ]
 
+[[package]]
+name = "peeking_take_while"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "19b17cddbe7ec3f8bc800887bab5e717348c95ea2ca0b1bf0837fb964dc67099"
+
 [[package]]
 name = "pin-project"
 version = "1.0.1"
@@ -472,6 +684,31 @@ version = "0.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8b870d8c151b6f2fb93e84a13146138f05d02ed11c7e7c54f8826aaaf7c9f184"
 
+[[package]]
+name = "pipewire"
+version = "0.1.0"
+source = "git+https://gitlab.freedesktop.org/gdesmott/pipewire-rs?branch=proxies#6560d4f769cc0d9937d6091f2f3eb298ef31cbfc"
+dependencies = [
+ "anyhow",
+ "bitflags",
+ "libc",
+ "libspa",
+ "libspa-sys",
+ "pipewire-sys",
+ "signal",
+ "thiserror",
+]
+
+[[package]]
+name = "pipewire-sys"
+version = "0.1.0"
+source = "git+https://gitlab.freedesktop.org/gdesmott/pipewire-rs?branch=proxies#6560d4f769cc0d9937d6091f2f3eb298ef31cbfc"
+dependencies = [
+ "bindgen",
+ "libspa-sys",
+ "system-deps 2.0.2",
+]
+
 [[package]]
 name = "pkg-config"
 version = "0.3.19"
@@ -541,24 +778,76 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.4.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38cf2c13ed4745de91a5eb834e11c00bcc3709e773173b2ce4c56c9fbde04b9c"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax",
+ "thread_local",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.21"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b181ba2dcf07aaccad5448e8ead58db5b742cf85dfe035e2227f137a539a189"
+
+[[package]]
+name = "rustc-hash"
+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "08d43f7aa6b08d49f382cde6a7982047c3426db949b1424bc4b7ec9ae12c6ce2"
+
 [[package]]
 name = "serde"
 version = "1.0.117"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b88fa983de7720629c9387e9f517353ed404164b1e482c970a90c1a4aaf7dc1a"
 
+[[package]]
+name = "shlex"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7fdf1b9db47230893d76faad238fd6097fd6d6a9245cd7a4d90dbd639536bbd2"
+
+[[package]]
+name = "signal"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2f6ce83b159ab6984d2419f495134972b48754d13ff2e3f8c998339942b56ed9"
+dependencies = [
+ "libc",
+ "nix",
+]
+
 [[package]]
 name = "slab"
 version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c111b5bd5695e56cffe5129854aa230b39c93a305372fdbb2668ca2394eea9f8"
 
+[[package]]
+name = "strsim"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8ea5119cdb4c55b55d432abb513a0429384878c15dde60cc77b1c99de1a95a6a"
+
 [[package]]
 name = "strum"
 version = "0.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "57bd81eb48f4c437cadc685403cad539345bf703d78e63707418431cecd4522b"
 
+[[package]]
+name = "strum"
+version = "0.20.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7318c509b5ba57f18533982607f24070a55d353e90d4cae30c467cdb2ad5ac5c"
+
 [[package]]
 name = "strum_macros"
 version = "0.18.0"
@@ -571,6 +860,18 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "strum_macros"
+version = "0.20.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee8bc6b87a5112aeeab1f4a9f7ab634fe6cbefc4850006df31267f4cfb9e3149"
+dependencies = [
+ "heck",
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "syn"
 version = "1.0.48"
@@ -590,11 +891,44 @@ checksum = "0f3ecc17269a19353b3558b313bba738b25d82993e30d62a18406a24aba4649b"
 dependencies = [
  "heck",
  "pkg-config",
- "strum",
+ "strum 0.18.0",
- "strum_macros",
+ "strum_macros 0.18.0",
  "thiserror",
  "toml",
- "version-compare",
+ "version-compare 0.0.10",
+]
+
+[[package]]
+name = "system-deps"
+version = "2.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8f0e2c9cfeb7afa05a18802454f8b467ba12e459301af4b17ea69bce3f63e990"
+dependencies = [
+ "heck",
+ "pkg-config",
+ "strum 0.20.0",
+ "strum_macros 0.20.1",
+ "thiserror",
+ "toml",
+ "version-compare 0.0.11",
+]
+
+[[package]]
+name = "termcolor"
+version = "1.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dfed899f0eb03f32ee8c6a0aabdb8a7949659e3466561fc0adf54e26d88c5f4"
+dependencies = [
+ "winapi-util",
+]
+
+[[package]]
+name = "textwrap"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d326610f408c7a4eb6f51c37c330e496b08506c9457c9d34287ecc38809fb060"
+dependencies = [
+ "unicode-width",
 ]
 
 [[package]]
@@ -617,6 +951,15 @@ dependencies = [
  "syn",
 ]
 
+[[package]]
+name = "thread_local"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d40c6d1b69745a6ec6fb1ca717914848da4b44ae29d9b3080cbee91d72a69b14"
+dependencies = [
+ "lazy_static",
+]
+
 [[package]]
 name = "toml"
 version = "0.5.7"
@@ -632,24 +975,57 @@ version = "1.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "e83e153d1053cbb5a118eeff7fd5be06ed99153f00dbcd8ae310c5fb2b22edc0"
 
+[[package]]
+name = "unicode-width"
+version = "0.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9337591893a19b88d8d87f2cec1e73fad5cdfd10e5a6f349f498ad6ea2ffb1e3"
+
 [[package]]
 name = "unicode-xid"
 version = "0.2.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564"
 
+[[package]]
+name = "vec_map"
+version = "0.8.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f1bddf1187be692e79c5ffeab891132dfb0f236ed36a43c7ed39f1165ee20191"
+
 [[package]]
 name = "version-compare"
 version = "0.0.10"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d63556a25bae6ea31b52e640d7c41d1ab27faba4ccb600013837a3d0b3994ca1"
 
+[[package]]
+name = "version-compare"
+version = "0.0.11"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1c18c859eead79d8b95d09e4678566e8d70105c4e7b251f707a03df32442661b"
+
 [[package]]
 name = "version_check"
 version = "0.9.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "b5a972e5669d67ba988ce3dc826706fb0a8b01471c088cb0b6110b805cc36aed"
 
+[[package]]
+name = "void"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6a02e4885ed3bc0f2de90ea6dd45ebcbb66dacffe03547fadbb0eeae2770887d"
+
+[[package]]
+name = "which"
+version = "3.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d011071ae14a2f6671d0b74080ae0cd8ebf3a6f8c9589a2cd45f23126fe29724"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "winapi"
 version = "0.3.9"
@@ -666,6 +1042,15 @@ version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
+[[package]]
+name = "winapi-util"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"

Cargo.toml

@@ -11,4 +11,6 @@ cairo-rs = "0.9.1"
 glib = "0.10.3"
 gdk = "0.13.2"
 gtk = "0.9.2"
-gio = "0.9.1"
+gio = "0.9.1"
+
+pipewire = { git = "https://gitlab.freedesktop.org/gdesmott/pipewire-rs", branch = "proxies"}

src/main.rs

@@ -1,11 +1,13 @@
+mod pipewire_connection;
 mod view;
 
 use gio::prelude::*;
 use glib::clone;
 use gtk::prelude::*;
 
-use std::rc::Rc;
+use std::{cell::RefCell, rc::Rc};
 
+#[derive(Debug)]
 pub struct PipewireLink {
     pub node_from: u32,
     pub port_from: u32,
@@ -15,33 +17,18 @@ pub struct PipewireLink {
 
 fn main() -> Result<(), Box<dyn std::error::Error>> {
     gtk::init()?;
-    let mut graphview = view::GraphView::new();
+    let graphview = Rc::new(RefCell::new(view::GraphView::new()));
 
-    // For UI Testing purposes
+    // Create the connection to the pipewire server and do an initial roundtrip before showing the view,
-    let mut node = view::PipewireNode::new("Test Node");
+    // so that the graph is already populated when the window opens.
-    node.add_ingoing_port(10, gtk::Button::with_label("Ingoing Port"));
+    let pw_con = pipewire_connection::PipewireConnection::new(graphview.clone())
-    node.add_outgoing_port(11, gtk::Button::with_label("Outgoing Port"));
+        .expect("Failed to initialize pipewire connection");
-    node.add_outgoing_port(12, gtk::Button::with_label("Outgoing Port 2"));
+    pw_con.roundtrip();
-
+    // From now on, call roundtrip() every second.
-    let mut node2 = view::PipewireNode::new("Test Node 2");
+    glib::timeout_add_seconds_local(1, move || {
-    node2.add_ingoing_port(13, gtk::Button::with_label("Ingoing Port"));
+        pw_con.roundtrip();
-    node2.add_outgoing_port(14, gtk::Button::with_label("Outgoing Port"));
+        Continue(true)
-    node2.add_outgoing_port(15, gtk::Button::with_label("Outgoing Port 2"));
+    });
-
-    graphview.add_node(0, node);
-    graphview.add_node(1, node2);
-    graphview.add_link(
-        2,
-        PipewireLink {
-            node_from: 0,
-            port_from: 12,
-            node_to: 1,
-            port_to: 13,
-        },
-    );
-    // End UI Testing
-
-    let graphview = Rc::new(graphview);
 
     let app = gtk::Application::new(
         Some("org.freedesktop.pipewire.graphui"),
@@ -53,7 +40,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
         let window = gtk::ApplicationWindow::new(app);
         window.set_default_size(800, 600);
         window.set_title("Pipewire Graph Editor");
-        window.add(&graphview.widget);
+        window.add(&graphview.borrow().widget);
         window.show_all();
     }));
 

src/pipewire_connection.rs

@@ -0,0 +1,155 @@
+use std::{
+    cell::{Cell, RefCell},
+    rc::Rc,
+};
+
+use glib::clone;
+use pipewire as pw;
+use pw::{port::Direction, registry::ObjectType, PW_ID_CORE};
+
+use crate::PipewireLink;
+
+pub struct PipewireConnection {
+    mainloop: pw::MainLoop,
+    _context: pw::Context<pw::MainLoop>,
+    core: pw::Core,
+    _registry: pw::registry::Registry,
+    _reg_listeners: pw::registry::Listener,
+}
+
+impl PipewireConnection {
+    pub fn new(graphview: Rc<RefCell<crate::view::GraphView>>) -> Result<Self, String> {
+        pw::init();
+        let mainloop = pw::MainLoop::new().map_err(|_| "Failed to create pipewire mainloop!")?;
+        let context =
+            pw::Context::new(&mainloop).map_err(|_| "Failed to create pipewire context")?;
+        let core = context
+            .connect()
+            .map_err(|_| "Failed to connect to pipewire core")?;
+        let registry = core.get_registry();
+
+        let reg_listeners = registry
+            .add_listener_local()
+            .global(clone!(@weak graphview => @default-panic, move |global| {
+                PipewireConnection::handle_global(graphview, global)
+            }))
+            .global_remove(|_| { /* TODO */ })
+            .register();
+
+        Ok(Self {
+            mainloop,
+            _context: context,
+            core,
+            _registry: registry,
+            _reg_listeners: reg_listeners,
+        })
+    }
+
+    pub fn roundtrip(&self) {
+        let done = Rc::new(Cell::new(false));
+        let pending = self.core.sync(0);
+
+        let done_clone = done.clone();
+        let loop_clone = self.mainloop.clone();
+
+        let _listener = self
+            .core
+            .add_listener_local()
+            .done(move |id, seq| {
+                if id == PW_ID_CORE && seq == pending {
+                    done_clone.set(true);
+                    loop_clone.quit();
+                }
+            })
+            .register();
+
+        while !done.get() {
+            self.mainloop.run();
+        }
+    }
+
+    fn handle_global(
+        graphview: Rc<RefCell<crate::view::GraphView>>,
+        global: pw::registry::GlobalObject,
+    ) {
+        match global.type_ {
+            ObjectType::Node => {
+                let node_widget = crate::view::Node::new(&format!(
+                    "{}",
+                    global
+                        .props
+                        .map(|dict| String::from(
+                            dict.get("node.nick")
+                                .or(dict.get("node.description"))
+                                .or(dict.get("node.name"))
+                                .unwrap_or_default()
+                        ))
+                        .unwrap_or_default()
+                ));
+
+                graphview.borrow_mut().add_node(global.id, node_widget);
+            }
+            ObjectType::Port => {
+                let props = global.props.expect("Port object is missing properties");
+                let port_label = format!("{}", props.get("port.name").unwrap_or_default());
+                let node_id: u32 = props
+                    .get("node.id")
+                    .expect("Port has no node.id property!")
+                    .parse()
+                    .expect("Could not parse node.id property");
+                let port = crate::view::port::Port::new(
+                    global.id,
+                    &port_label,
+                    if matches!(props.get("port.direction"), Some("in")) {
+                        Direction::Input
+                    } else {
+                        Direction::Output
+                    },
+                );
+
+                graphview
+                    .borrow_mut()
+                    .add_port_to_node(node_id, global.id, port);
+            }
+            ObjectType::Link => {
+                let props = global.props.expect("Link object is missing properties");
+                let input_node: u32 = props
+                    .get("link.input.node")
+                    .expect("Link has no link.input.node property")
+                    .parse()
+                    .expect("Could not parse link.input.node property");
+                let input_port: u32 = props
+                    .get("link.input.port")
+                    .expect("Link has no link.input.port property")
+                    .parse()
+                    .expect("Could not parse link.input.port property");
+                let output_node: u32 = props
+                    .get("link.output.node")
+                    .expect("Link has no link.input.node property")
+                    .parse()
+                    .expect("Could not parse link.input.node property");
+                let output_port: u32 = props
+                    .get("link.output.port")
+                    .expect("Link has no link.output.port property")
+                    .parse()
+                    .expect("Could not parse link.output.port property");
+                graphview.borrow_mut().add_link(
+                    global.id,
+                    PipewireLink {
+                        node_from: output_node,
+                        port_from: output_port,
+                        node_to: input_node,
+                        port_to: input_port,
+                    },
+                );
+            }
+            _ => {}
+        }
+    }
+}
+
+/*impl Drop for PipewireConnection {
+    fn drop(&mut self) {
+        unsafe { pw::deinit() }
+    }
+}*/

src/view/graph_view.rs

@@ -1,4 +1,4 @@
-use super::PipewireNode;
+use super::Node;
 use cairo::Context;
 use glib::clone;
 use gtk::{prelude::*, LayoutExt};
@@ -6,7 +6,7 @@ use std::{cell::RefCell, collections::HashMap, rc::Rc};
 
 pub struct GraphView {
     pub(crate) widget: gtk::Layout,
-    nodes: Rc<RefCell<HashMap<u32, PipewireNode>>>,
+    nodes: Rc<RefCell<HashMap<u32, Node>>>,
     links: Rc<RefCell<HashMap<u32, crate::PipewireLink>>>,
 }
 
@@ -28,16 +28,29 @@ impl GraphView {
         result
     }
 
-    pub fn add_node(&mut self, id: u32, node: PipewireNode) {
+    pub fn add_node(&mut self, id: u32, node: Node) {
         // TODO: Find a free position to put the widget at.
         self.widget.put(
             &node.widget,
-            (self.nodes.borrow().len() % 4 * 400) as i32,
+            (self.nodes.borrow().len() / 4 * 400) as i32,
-            (self.nodes.borrow().len() / 4 * 100) as i32,
+            (self.nodes.borrow().len() % 4 * 100) as i32,
         );
+        node.widget.show_all();
         self.nodes.borrow_mut().insert(id, node);
     }
 
+    pub fn add_port_to_node(&mut self, node_id: u32, port_id: u32, port: super::port::Port) {
+        if let Some(node) = self.nodes.borrow_mut().get_mut(&node_id) {
+            node.add_port(port_id, port);
+        } else {
+            // FIXME: Log this instead
+            eprintln!(
+                "Node with id {} not found when trying to add port with id {} to graph",
+                node_id, port_id
+            );
+        }
+    }
+
     /// Add a link to the graph.
     ///
     /// `add_link` takes three arguments: `link_id` is the id of the link as assigned by the pipewire server,
@@ -49,7 +62,7 @@ impl GraphView {
 }
 
 fn draw(
-    nodes: Rc<RefCell<HashMap<u32, PipewireNode>>>,
+    nodes: Rc<RefCell<HashMap<u32, Node>>>,
     links: Rc<RefCell<HashMap<u32, crate::PipewireLink>>>,
     cr: &Context,
 ) {
@@ -58,44 +71,40 @@ fn draw(
     cr.paint();
     cr.set_source_rgb(0.0, 0.0, 0.0);
     for link in links.borrow().values() {
-        let (from_alloc, to_alloc) = get_allocs(nodes.clone(), link);
+        if let Some((from_alloc, to_alloc)) = get_allocs(nodes.clone(), link) {
+            let from_x: f64 = (from_alloc.x + from_alloc.width).into();
+            let from_y: f64 = (from_alloc.y + (from_alloc.height / 2)).into();
+            cr.move_to(from_x, from_y);
 
-        let from_x: f64 = (from_alloc.x + from_alloc.width).into();
+            let to_x: f64 = to_alloc.x.into();
-        let from_y: f64 = (from_alloc.y + (from_alloc.height / 2)).into();
+            let to_y: f64 = (to_alloc.y + (to_alloc.height / 2)).into();
-        cr.move_to(
+            cr.curve_to(from_x + 75.0, from_y, to_x - 75.0, to_y, to_x, to_y);
-            from_x, from_y
-        );
 
-        let to_x: f64 = to_alloc.x.into();
+            cr.stroke();
-        let to_y: f64 = (to_alloc.y + (to_alloc.height / 2)).into();
+        } else {
-        cr.curve_to(
+            eprintln!("Could not get allocation of ports of link: {:?}", link);
-            from_x + 75.0, from_y,
+        }
-            to_x - 75.0, to_y,
-            to_x, to_y
-        );
-
-        cr.stroke();
     }
 }
 
 fn get_allocs(
-    nodes: Rc<RefCell<HashMap<u32, PipewireNode>>>,
+    nodes: Rc<RefCell<HashMap<u32, Node>>>,
     link: &crate::PipewireLink,
-) -> (gtk::Allocation, gtk::Allocation) {
+) -> Option<(gtk::Allocation, gtk::Allocation)> {
+    println!();
+
     let from_alloc = &nodes
         .borrow()
-        .get(&link.node_from)
+        .get(&link.node_from)?
-        .unwrap()
+        .get_port(link.port_from)?
-        .get_outgoing_port(link.port_from)
+        .widget
-        .unwrap()
         .get_allocation();
     let to_alloc = &nodes
         .borrow()
-        .get(&link.node_to)
+        .get(&link.node_to)?
-        .unwrap()
+        .get_port(link.port_to)?
-        .get_ingoing_port(link.port_to)
+        .widget
-        .unwrap()
         .get_allocation();
 
-    (from_alloc.to_owned(), to_alloc.to_owned())
+    Some((from_alloc.to_owned(), to_alloc.to_owned()))
 }

src/view/mod.rs

@@ -1,5 +1,6 @@
 mod graph_view;
-mod pipewire_node;
+mod node;
+pub mod port;
 
 pub use graph_view::GraphView;
-pub use pipewire_node::PipewireNode;
+pub use node::Node;

src/view/node.rs

@@ -1,40 +1,47 @@
-use gtk::prelude::*;
 use gdk::prelude::*;
+use gtk::prelude::*;
 use std::collections::HashMap;
 
-pub struct PipewireNode {
+use pipewire::port::Direction;
+
+pub struct Node {
     pub(super) widget: gtk::Grid,
     label: gtk::Label,
     label_box: gtk::EventBox,
-    ingoing_ports: HashMap<u32, gtk::Button>,
+    ports: HashMap<u32, super::port::Port>,
-    outgoing_ports: HashMap<u32, gtk::Button>,
+    num_ports_in: u32,
+    num_ports_out: u32,
 }
 
-impl PipewireNode {
+impl Node {
     pub fn new(name: &str) -> Self {
         let result = Self {
             widget: gtk::Grid::new(),
             label: gtk::Label::new(Some(name)),
             label_box: gtk::EventBox::new(),
-            ingoing_ports: HashMap::new(),
+            ports: HashMap::new(),
-            outgoing_ports: HashMap::new(),
+            num_ports_in: 0,
+            num_ports_out: 0,
         };
 
         result.label_box.add(&result.label);
         result.widget.attach(&result.label_box, 0, 0, 2, 1);
 
+        // Setup needed events for dragging a node.
         result
             .label_box
             .add_events(gdk::EventMask::BUTTON1_MOTION_MASK);
+
+        // Setup callback for dragging the node.
         result
             .label_box
             .connect_motion_notify_event(|label, event| {
-                let grid = label
+                let node_frame = label
                     .get_ancestor(gtk::Grid::static_type())
                     .unwrap()
                     .dynamic_cast::<gtk::Grid>()
                     .unwrap();
-                let graphview = grid
+                let graphview = node_frame
                     .get_ancestor(gtk::Layout::static_type())
                     .unwrap()
                     .dynamic_cast::<gtk::Layout>()
@@ -47,8 +54,8 @@ impl PipewireNode {
 
                 // TODO: Calculate proper values to center the mouse on the label
                 // instead of using hardcoded offsets.
-                graphview.set_child_x(&grid, x as i32 - offset_x - 100);
+                graphview.set_child_x(&node_frame, x as i32 - offset_x - 100);
-                graphview.set_child_y(&grid, y as i32 - offset_y - 50);
+                graphview.set_child_y(&node_frame, y as i32 - offset_y - 50);
 
                 // FIXME: If links become proper widgets,
                 // we don't need to redraw the full graph everytime.
@@ -60,23 +67,25 @@ impl PipewireNode {
         result
     }
 
-    pub fn add_ingoing_port(&mut self, id: u32, port: gtk::Button) {
+    pub fn add_port(&mut self, id: u32, port: super::port::Port) {
-        self.widget
+        match port.direction {
-            .attach(&port, 0, (self.ingoing_ports.len() + 1) as i32, 1, 1);
+            Direction::Input => {
-        self.ingoing_ports.insert(id, port);
+                self.widget
+                    .attach(&port.widget, 0, (self.num_ports_in + 1) as i32, 1, 1);
+                self.num_ports_in += 1;
+            }
+            Direction::Output => {
+                self.widget
+                    .attach(&port.widget, 1, (self.num_ports_out + 1) as i32, 1, 1);
+                self.num_ports_out += 1;
+            }
+        }
+
+        port.widget.show_all();
+        self.ports.insert(id, port);
     }
 
-    pub fn add_outgoing_port(&mut self, id: u32, port: gtk::Button) {
+    pub fn get_port(&self, id: u32) -> Option<&super::port::Port> {
-        self.widget
+        self.ports.get(&id)
-            .attach(&port, 1, (self.outgoing_ports.len() + 1) as i32, 1, 1);
-        self.outgoing_ports.insert(id, port);
-    }
-
-    pub fn get_ingoing_port(&self, id: u32) -> Option<&gtk::Button> {
-        self.ingoing_ports.get(&id)
-    }
-
-    pub fn get_outgoing_port(&self, id: u32) -> Option<&gtk::Button> {
-        self.outgoing_ports.get(&id)
     }
 }

src/view/port.rs

@@ -0,0 +1,16 @@
+/// Graphical representation of a pipewire port.
+pub struct Port {
+    pub(super) widget: gtk::Button,
+    pub id: u32,
+    pub direction: pipewire::port::Direction,
+}
+
+impl Port {
+    pub fn new(id: u32, name: &str, direction: pipewire::port::Direction) -> Self {
+        Self {
+            widget: gtk::Button::with_label(name),
+            id,
+            direction
+        }
+    }
+}