fix: free up memory after we're done with it

.github/workflows/ci.yml

@@ -23,11 +23,12 @@ jobs:
         uses: actions/setup-go@v3
         with:
           cache: true
+          go-version: '1.20'
 
       - name: Install TinyGo
         uses: acifani/[email protected]
         with:
-          tinygo-version: 0.25.0
+          tinygo-version: 0.28.1
           binaryen-version: "110"
 
       - name: Setup Python env
@@ -71,4 +72,4 @@ jobs:
           echo $TEST | grep '"config": "1"'
           echo $TEST | grep '"a": "this is var a"'
 
-          extism call example/http.wasm --wasi http_get | grep '"userId": 1'
+          extism call example/http.wasm --wasi http_get --allow-host "jsonplaceholder.typicode.com" | grep '"userId": 1'

Makefile

@@ -6,4 +6,4 @@ example:
 test:
 	extism call example/example.wasm count_vowels --wasi --input "this is a test" --set-config '{"thing": "1234"}'	
 	@echo ""
-	extism call example/http.wasm http_get --wasi --log-level info
+	extism call example/http.wasm http_get --wasi --log-level info --allow-host "jsonplaceholder.typicode.com"

extism_pdk.go

@@ -125,6 +125,7 @@ func OutputString(s string) {
 
 func GetConfig(key string) (string, bool) {
 	mem := AllocateBytes([]byte(key))
+	defer mem.Free()
 
 	offset := C.extism_config_get(C.uint64_t(mem.offset))
 	clength := C.extism_length(offset)
@@ -153,6 +154,8 @@ func LogMemory(level LogLevel, memory Memory) {
 
 func Log(level LogLevel, s string) {
 	mem := AllocateString(s)
+	defer mem.Free()
+
 	LogMemory(level, mem)
 }
 
@@ -173,7 +176,10 @@ func GetVar(key string) []byte {
 
 func SetVar(key string, value []byte) {
 	keyMem := AllocateBytes([]byte(key))
+	defer keyMem.Free()
+
 	valMem := AllocateBytes(value)
+	defer valMem.Free()
 
 	C.extism_var_set(
 		C.uint64_t(keyMem.offset),
@@ -259,7 +265,6 @@ func (r *HTTPRequest) Send() HTTPResponse {
 	status := uint16(C.extism_http_status_code())
 
 	memory := Memory{offset, length}
-	defer memory.Free()
 
 	return HTTPResponse{
 		memory,

go.mod

@@ -1,5 +1,5 @@
 module github.com/extism/go-pdk
 
-go 1.19
+go 1.20
 
 require github.com/valyala/fastjson v1.6.3