add outbound http to same app tinygo example

Signed-off-by: Michelle Dhanani <michelle@fermyon.com>

examples/http-tinygo-outbound-http/outbound-http-to-same-app/go.mod

@@ -0,0 +1,9 @@
+module outbound-http-to-same-app
+
+go 1.17
+
+require github.com/fermyon/spin/sdk/go v0.0.0
+
+require github.com/julienschmidt/httprouter v1.3.0 // indirect
+
+replace github.com/fermyon/spin/sdk/go v0.0.0 => ../../../sdk/go/

examples/http-tinygo-outbound-http/outbound-http-to-same-app/main.go

@@ -0,0 +1,26 @@
+package main
+
+import (
+	"fmt"
+	"net/http"
+
+	spinhttp "github.com/fermyon/spin/sdk/go/http"
+)
+
+func init() {
+	spinhttp.Handle(func(w http.ResponseWriter, r *http.Request) {
+		// Because we included self in `allowed_http_hosts`, we can make outbound
+		// HTTP requests to our own app using a relative path.
+		// This is not yet supported in cloud.
+		resp, err := spinhttp.Get("/hello")
+		if err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+
+		fmt.Fprintln(w, resp.Body)
+		fmt.Fprintln(w, resp.Header.Get("content-type"))
+	})
+}
+
+func main() {}

examples/http-tinygo-outbound-http/spin.toml

@@ -7,9 +7,25 @@ version = "1.0.0"
 
 [[component]]
 id = "tinygo-hello"
-source = "main.wasm"
-allowed_http_hosts = ["https://random-data-api.fermyon.app", "https://postman-echo.com"]
+source = "tinygo-hello/main.wasm"
+allowed_http_hosts = [
+    "https://random-data-api.fermyon.app",
+    "https://postman-echo.com",
+]
 [component.trigger]
 route = "/hello"
 [component.build]
+workdir = "tinygo-hello"
+command = "tinygo build -target=wasi -gc=leaking -no-debug -o main.wasm main.go"
+
+[[component]]
+id = "outbound-http-to-same-app"
+source = "outbound-http-to-same-app/main.wasm"
+# Use self to make outbound requests to components in the same Spin application.
+# `self` is not yet supported in cloud
+allowed_http_hosts = ["self"]
+[component.trigger]
+route = "/outbound-http-to-same-app"
+[component.build]
+workdir = "outbound-http-to-same-app"
 command = "tinygo build -target=wasi -gc=leaking -no-debug -o main.wasm main.go"

examples/http-tinygo-outbound-http/go.mod → examples/http-tinygo-outbound-http/tinygo-hello/go.mod

@@ -6,4 +6,4 @@ require github.com/fermyon/spin/sdk/go v0.0.0
 
 require github.com/julienschmidt/httprouter v1.3.0 // indirect
 
-replace github.com/fermyon/spin/sdk/go v0.0.0 => ../../sdk/go/
+replace github.com/fermyon/spin/sdk/go v0.0.0 => ../../../sdk/go/

examples/http-tinygo-outbound-http/tinygo-hello/go.sum

@@ -0,0 +1,2 @@
+github.com/julienschmidt/httprouter v1.3.0 h1:U0609e9tgbseu3rBINet9P48AI/D3oJs4dN7jwJOQ1U=
+github.com/julienschmidt/httprouter v1.3.0/go.mod h1:JR6WtHb+2LUe8TCKY3cZOxFyyO8IZAc4RVcycCCAKdM=