find ipsf address by the env variable

examples/ipfs_node/Config.toml

@@ -8,7 +8,7 @@
     ipfs = "/usr/local/bin/ipfs"
 
     [core_module.wasi]
-    envs = []
+    envs = ["IPFS_ADDR=/dns4/relay02.fluence.dev/tcp/15001"]
     preopened_files = ["./wasm/artifacts"]
     mapped_dirs = { "tmp" = "./wasm/artifacts" }
 

examples/ipfs_node/src/main.rs

@@ -34,11 +34,11 @@ fn main() {
 
     println!("ipfs node interface is\n{}", ipfs_node.get_interface());
 
-    let node_addresses = ipfs_node
-        .call_module("ipfs_node.wasm", "get_addresses", &[])
+    let node_address = ipfs_node
+        .call_module("ipfs_node.wasm", "get_address", &[])
         .unwrap();
 
-    println!("ipfs node addresses are:\n{:?}", node_addresses);
+    println!("ipfs node address is:\n{:?}", node_address);
 
     let result = ipfs_node
         .call_code(

examples/ipfs_node/wasm/ipfs_node/src/main.rs

@@ -24,6 +24,7 @@ use crate::result::{RESULT_PTR, RESULT_SIZE};
 use crate::path::to_full_path;
 
 const RESULT_FILE_PATH: &str = "/tmp/ipfs_rpc_file";
+const IPFS_ADDR_ENV_NAME: &str = "IPFS_ADDR";
 
 pub fn main() {
     let msg = "ipfs_node.main: WASI initialization finished";
@@ -92,32 +93,24 @@ pub unsafe fn get(hash_ptr: *mut u8, hash_size: usize) {
 }
 
 #[no_mangle]
-pub unsafe fn get_addresses() {
-    let msg = "ipfs_node.get_addresses".to_string();
+pub unsafe fn get_address() {
+    let msg = "ipfs_node.get_address".to_string();
     log_utf8_string(msg.as_ptr() as _, msg.len() as _);
 
-    let cmd = "id -f'<addrs>'";
-    let result = ipfs(cmd.as_ptr() as _, cmd.len() as _);
-
-    let multiaddrs = if result == 0 {
-        String::from_raw_parts(
-            *RESULT_PTR.get_mut() as _,
-            *RESULT_SIZE.get_mut(),
-            *RESULT_SIZE.get_mut(),
-        )
-    } else {
-        "host ipfs call failed".to_string()
+    let ipfs_address = match std::env::var(IPFS_ADDR_ENV_NAME) {
+        Ok(addr) => addr,
+        Err(e) => format!("getting {} env variable failed with error {:?}", IPFS_ADDR_ENV_NAME, e)
     };
 
     let msg = format!(
-        "ipfs_node.get_addresses: node addresses are {} \n",
-        multiaddrs
+        "ipfs_node.get_address: node address is {} \n",
+        ipfs_address
     );
     log_utf8_string(msg.as_ptr() as _, msg.len() as _);
 
-    *RESULT_PTR.get_mut() = multiaddrs.as_ptr() as _;
-    *RESULT_SIZE.get_mut() = multiaddrs.len();
-    std::mem::forget(multiaddrs);
+    *RESULT_PTR.get_mut() = ipfs_address.as_ptr() as _;
+    *RESULT_SIZE.get_mut() = ipfs_address.len();
+    std::mem::forget(ipfs_address);
 }
 
 #[link(wasm_import_module = "host")]

examples/ipfs_node/wasm/ipfs_node/wit

@@ -25,10 +25,10 @@
 ;; import ipfs put/get function
 (@interface type (func (param string) (result string))) ;; 8
 
-;; export ipfs.get_addresses function
+;; export ipfs.get_address function
 (@interface type (func (result string)))                ;; 9
 
-;; export ipfs.get_addresses function
+;; export ipfs.get_address function
 (@interface type (func ))                               ;; 10
 
 (@interface export "allocate" (func  0))        ;; 0
@@ -40,7 +40,7 @@
 
 (@interface export "put" (func 5))              ;; 6
 (@interface export "get" (func 6))              ;; 7
-(@interface export "get_addresses" (func 10))   ;; 8
+(@interface export "get_address" (func 10))   ;; 8
 
 ;; adapter for export function put
 (@interface func (type 7)
@@ -74,7 +74,7 @@
     call-core 1         ;; call deallocate
 )
 
-;; adapter for export function get_addresses
+;; adapter for export function get_address
 (@interface func (type 9)
     call-core 8         ;; call self.get
     call-core 3         ;; call get_result_ptr