From 63f3e28ff8877cd4018d5c35bd932eff887bac34 Mon Sep 17 00:00:00 2001
From: Brooks Townsend <brooks@cosmonic.com>
Date: Mon, 19 Sep 2022 13:36:52 -0400
Subject: [PATCH] Added blobstore example, Animal Image Downloader (#158)

* added animal image downloader actor

Signed-off-by: Brooks Townsend <brooks@cosmonic.com>

* cleaned up example

Signed-off-by: Brooks Townsend <brooks@cosmonic.com>

* added links for capability providers

Signed-off-by: Brooks Townsend <brooks@cosmonic.com>

* Update actor/animal-image-downloader/README.md

Co-authored-by: Connor Smith <connor.smith.256@gmail.com>

Signed-off-by: Brooks Townsend <brooks@cosmonic.com>
Co-authored-by: Connor Smith <connor.smith.256@gmail.com>
---
 .github/workflows/animal-image-downloader.yml |  102 +
 .gitignore                                    |    4 +-
 README.md                                     |    1 +
 .../.cargo/config.toml                        |    2 +
 actor/animal-image-downloader/.gitignore      |   41 +
 actor/animal-image-downloader/Cargo.lock      | 2717 +++++++++++++++++
 actor/animal-image-downloader/Cargo.toml      |   24 +
 actor/animal-image-downloader/Makefile        |   21 +
 actor/animal-image-downloader/README.md       |   30 +
 actor/animal-image-downloader/actor.mk        |  138 +
 actor/animal-image-downloader/src/lib.rs      |  108 +
 11 files changed, 3187 insertions(+), 1 deletion(-)
 create mode 100644 .github/workflows/animal-image-downloader.yml
 create mode 100644 actor/animal-image-downloader/.cargo/config.toml
 create mode 100644 actor/animal-image-downloader/.gitignore
 create mode 100644 actor/animal-image-downloader/Cargo.lock
 create mode 100644 actor/animal-image-downloader/Cargo.toml
 create mode 100644 actor/animal-image-downloader/Makefile
 create mode 100644 actor/animal-image-downloader/README.md
 create mode 100644 actor/animal-image-downloader/actor.mk
 create mode 100644 actor/animal-image-downloader/src/lib.rs

diff --git a/.github/workflows/animal-image-downloader.yml b/.github/workflows/animal-image-downloader.yml
new file mode 100644
index 00000000..ac6f08de
--- /dev/null
+++ b/.github/workflows/animal-image-downloader.yml
@@ -0,0 +1,102 @@
+name: ANIMAL IMAGE DOWNLOADER
+
+on:
+  push:
+    branches: [main]
+    paths:
+      - "actor/animal-image-downloader/**"
+    tags:
+      - "animal-image-downloader-v*"
+  pull_request:
+    branches: [main]
+    paths:
+      - "actor/animal-image-downloader/**"
+
+env:
+  CARGO_TERM_COLOR: always
+  working-directory: ./actor/animal-image-downloader
+  WASH_ISSUER_KEY: ${{ secrets.WASMCLOUD_ACCOUNT_OFFICIAL }}
+  WASH_SUBJECT_KEY: ${{ secrets.WASMCLOUD_ANIMAL_IMAGE_DOWNLOADER }}
+
+jobs:
+  rust_check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      # If your integration tests require nats or redis, run them here
+      - name: Add wasm32-unknown-unknown
+        run: rustup target add wasm32-unknown-unknown
+      - id: rust-check-action
+        uses: wasmcloud/common-actions/rust-check@main
+        with:
+          working-directory: ${{ env.working-directory }}
+          # The `--doc` is required for wasm, as cargo cannot execute wasm tests by default
+          test-options: "--verbose --doc"
+
+  build_artifact:
+    needs: rust_check
+    if: startswith(github.ref, 'refs/tags/') # Only run on tag push
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: wasmcloud/common-actions/install-wash@main
+
+      - name: Add wasm32-unknown-unknown
+        run: rustup target add wasm32-unknown-unknown
+
+      - name: Build wasmcloud actor
+        run: make
+        working-directory: ${{ env.working-directory }}
+
+      - name: Upload signed actor to GH Actions
+        uses: actions/upload-artifact@v2
+        with:
+          name: wasmcloud-actor
+          path: ${{ env.working-directory }}/build/*.wasm
+
+  github_release:
+    if: startswith(github.ref, 'refs/tags/') # Only run on tag push
+    needs: build_artifact
+    runs-on: ubuntu-latest
+    steps:
+      - name: Download signed actor
+        uses: actions/download-artifact@v2
+        with:
+          name: wasmcloud-actor
+          path: ${{ env.working-directory }}/build
+
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        with:
+          files: ${{ env.working-directory }}/build/*.wasm
+          token: ${{ secrets.GITHUB_TOKEN }}
+          prerelease: true
+          draft: false
+
+  artifact_release:
+    needs: build_artifact
+    if: startswith(github.ref, 'refs/tags/') # Only run on tag push
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - name: Download signed actor
+        uses: actions/download-artifact@v2
+        with:
+          name: wasmcloud-actor
+          path: ${{ env.working-directory }}/build
+
+      - name: Determine artifact metadata
+        run: |
+          echo "oci-repository=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[].name')" >> $GITHUB_ENV
+          echo "oci-version=$(cargo metadata --no-deps --format-version 1 | jq -r '.packages[].version')" >> $GITHUB_ENV
+        working-directory: ${{ env.working-directory }}
+
+      - name: Push actor to AzureCR
+        uses: wasmcloud/common-actions/oci-artifact-release@main
+        with:
+          artifact-path: ${{ env.working-directory }}/build/animal_image_downloader_s.wasm
+          oci-url: ${{ secrets.AZURECR_PUSH_URL }}
+          oci-repository: ${{ env.oci-repository }}
+          oci-version: ${{ env.oci-version }}
+          oci-username: ${{ secrets.AZURECR_PUSH_USER }}
+          oci-password: ${{ secrets.AZURECR_PUSH_PASSWORD }}
diff --git a/.gitignore b/.gitignore
index 9197b239..5de1385a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,4 +3,6 @@
 pre-otp/
 
 .vscode
-*logs.txt
\ No newline at end of file
+*logs.txt
+
+host_config.json
diff --git a/README.md b/README.md
index 6a77252b..cee1937d 100644
--- a/README.md
+++ b/README.md
@@ -8,6 +8,7 @@ The following actors run as WebAssembly on wasmCloud hosts.
 
 | Example | Description | OCI Reference <br/> (refer to example for latest version) |
 |---|---|---|
+| [animal-image-downloader](https://github.com/wasmcloud/examples/tree/main/actor/animal-image-downloader) | An actor that receives messages and makes HTTP requests, downloading a picture of an animal to a blobstore |  `wasmcloud.azurecr.io/animal-image-downloader` |
 | [echo](https://github.com/wasmcloud/examples/tree/main/actor/echo) | An actor that listens on an HTTP port and returns a JSON payload describing the incoming request |  `wasmcloud.azurecr.io/echo` |
 | [echo-messaging](https://github.com/wasmcloud/examples/tree/main/actor/echo-messaging) | An actor that listens on a message broker topic and replies |  `wasmcloud.azurecr.io/echo-messaging` |
 | [hello](https://github.com/wasmcloud/examples/tree/main/actor/hello) | Canonical "hello world" actor that listens on an HTTP port and replies with a greeting |  `wasmcloud.azurecr.io/hello` |
diff --git a/actor/animal-image-downloader/.cargo/config.toml b/actor/animal-image-downloader/.cargo/config.toml
new file mode 100644
index 00000000..f4e8c002
--- /dev/null
+++ b/actor/animal-image-downloader/.cargo/config.toml
@@ -0,0 +1,2 @@
+[build]
+target = "wasm32-unknown-unknown"
diff --git a/actor/animal-image-downloader/.gitignore b/actor/animal-image-downloader/.gitignore
new file mode 100644
index 00000000..fb811c5f
--- /dev/null
+++ b/actor/animal-image-downloader/.gitignore
@@ -0,0 +1,41 @@
+# This file lists build byproducts, 
+# IDE-specific files (unless shared by your team)
+
+
+## Build
+/build
+/dist/
+/target
+**target
+
+## File system
+.DS_Store
+desktop.ini
+
+## Editor
+*.swp
+*.swo
+Session.vim
+.cproject
+.idea
+*.iml
+.vscode
+.project
+.favorites.json
+.settings/
+
+## Temporary files
+*~
+\#*
+\#*\#
+.#*
+
+## Python
+__pycache__/
+*.py[cod]
+*$py.class
+
+## Node
+**node_modules
+**package-lock.json
+
diff --git a/actor/animal-image-downloader/Cargo.lock b/actor/animal-image-downloader/Cargo.lock
new file mode 100644
index 00000000..cf9f0bf2
--- /dev/null
+++ b/actor/animal-image-downloader/Cargo.lock
@@ -0,0 +1,2717 @@
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+# It is not intended for manual editing.
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+
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+ "futures 0.3.21",
+ "serde_json",
+ "wasmbus-rpc",
+ "wasmcloud-interface-blobstore",
+ "wasmcloud-interface-httpclient",
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+]
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diff --git a/actor/animal-image-downloader/Cargo.toml b/actor/animal-image-downloader/Cargo.toml
new file mode 100644
index 00000000..1ba0841d
--- /dev/null
+++ b/actor/animal-image-downloader/Cargo.toml
@@ -0,0 +1,24 @@
+[package]
+name = "animal-image-downloader"
+version = "0.1.0"
+authors = [ "wasmCloud Team" ]
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+name = "animal_image_downloader"
+
+[dependencies]
+futures = "0.3"
+form_urlencoded = "1.0"
+serde_json = "1.0.85"
+wasmbus-rpc = "0.10"
+wasmcloud-interface-messaging = "0.7.0"
+wasmcloud-interface-httpclient = "0.7.0"
+wasmcloud-interface-blobstore = "0.4.0"
+
+[profile.release]
+# Optimize for small code size
+lto = true
+opt-level = "s"
+strip = true
diff --git a/actor/animal-image-downloader/Makefile b/actor/animal-image-downloader/Makefile
new file mode 100644
index 00000000..1ecd1829
--- /dev/null
+++ b/actor/animal-image-downloader/Makefile
@@ -0,0 +1,21 @@
+# Makefile for animal-image-downloader
+
+PROJECT  = animal_image_downloader
+VERSION  = $(shell cargo metadata --no-deps --format-version 1 | jq -r '.packages[] .version' | head -1)
+REVISION = 0
+# list of all contract claims for actor signing (space-separated)
+CLAIMS   = wasmcloud:httpclient wasmcloud:messaging wasmcloud:blobstore
+# registry url for our actor
+REG_URL  = localhost:5000/v2/$(PROJECT):$(VERSION)
+# command to upload to registry (without last wasm parameter)
+PUSH_REG_CMD = wash reg push --insecure $(REG_URL)
+
+# friendly name for the actor
+ACTOR_NAME = "Animal Image Downloader"
+# optional call alias for actor
+# ACTOR_ALIAS=nickname
+
+include ./actor.mk
+
+test::
+	cargo clippy --all-features --all-targets
diff --git a/actor/animal-image-downloader/README.md b/actor/animal-image-downloader/README.md
new file mode 100644
index 00000000..03faf253
--- /dev/null
+++ b/actor/animal-image-downloader/README.md
@@ -0,0 +1,30 @@
+# Animal Image Downloader Actor
+
+This actor accepts requests over a message broker to download a random image of a specified animal (supported are dogs, cats, and a fallback for unknown animal types).
+
+## Required Capability Claims
+1. `wasmcloud:httpclient` to request and download an animal picture
+1. `wasmcloud:messaging` to receive messages on a topic
+1. `wasmcloud:blobstore` to save the image to a blob
+
+## Running this example
+This example requires capability providers that fulfill the above contracts. The wasmCloud [HTTP Client](https://github.com/wasmCloud/capability-providers/tree/main/httpclient), [NATS Messaging](https://github.com/wasmCloud/capability-providers/tree/main/nats), and [Filesystem](https://github.com/wasmCloud/capability-providers/tree/main/blobstore-fs) capability providers implement this functionality but you're welcome to use any implementation.
+
+Once you've installed **wash** and ran wasmCloud after following the [installation guide](https://wasmcloud.dev/overview/installation/), you can run this example actor and the wasmCloud providers with the following commands:
+```
+wash ctl start actor wasmcloud.azurecr.io/animal-image-downloader:0.1.0
+# If you use a locally built actor, replace the actor ID below with your own
+wash ctl link put MDBIB35BEIFT552CBSJXY3TOQYGIDAWZMMX4TKD5AGMRSJUDYSDCDWDF VBBQNNCGUKIXEWLL5HL5XJE57BS3GU5DMDOKZS6ROEWPQFHEDP6NGVZM wasmcloud:blobstore "ROOT=/tmp"
+wash ctl link put MDBIB35BEIFT552CBSJXY3TOQYGIDAWZMMX4TKD5AGMRSJUDYSDCDWDF VCCVLH4XWGI3SGARFNYKYT2A32SUYA2KVAIV2U2Q34DQA7WWJPFRKIKM wasmcloud:httpclient
+wash ctl link put MDBIB35BEIFT552CBSJXY3TOQYGIDAWZMMX4TKD5AGMRSJUDYSDCDWDF VADNMSIML2XGO2X4TPIONTIC55R2UUQGPPDZPAVSC2QD7E76CR77SPW7 wasmcloud:messaging "SUBSCRIPTION=wasmcloud.animal.*"
+wash ctl start provider wasmcloud.azurecr.io/blobstore-fs:0.1.0 --skip-wait
+wash ctl start provider wasmcloud.azurecr.io/httpclient:0.5.3 --skip-wait
+wash ctl start provider wasmcloud.azurecr.io/nats_messaging:0.14.5 --skip-wait
+```
+
+After running the above, you can use the [NATS CLI](https://github.com/nats-io/natscli) to request a dog, cat, or mystery image:
+```
+nats req wasmcloud.animal.dog '{}'
+nats req wasmcloud.animal.cat '{}'
+nats req wasmcloud.animal.idk '{}'
+```
\ No newline at end of file
diff --git a/actor/animal-image-downloader/actor.mk b/actor/animal-image-downloader/actor.mk
new file mode 100644
index 00000000..26f95339
--- /dev/null
+++ b/actor/animal-image-downloader/actor.mk
@@ -0,0 +1,138 @@
+# common makefile rules for building actors
+#
+# Before including this, your project Makefile should define the following:
+#
+# Required
+# -----------
+# PROJECT      - Short name for the project, must be valid filename chars, no spaces
+# CLAIMS       - Space-separated list of capability contracts to use for signing
+#                These should match the capability providers the actor needs to use.
+#                For example: 
+#                    wasmcloud:httpserver wasmcloud:builtin:logging
+# VERSION      - The actor version number, usually semver format, X.Y.Z
+# REVISION     - A number that should be incremented with every build,
+#                whether or not VERSION has changed
+# REG_URL      - Registry url, e.g. 'localhost:5000' or 'wasmcloud.azurecr.io'
+# PUSH_REG_CMD - Command to push to registry, for example:
+#                    wash reg push --insecure $(REG_URL)
+#
+# 
+# Optional
+# -----------
+# KEYDIR    - path to private key folder
+# CARGO     - cargo binary (name or path), defaults to cargo
+# WASH      - wash binary (name or path), defaults to wash
+# DIST_WASM - the final file after building and signing
+# TARGET_DIR - location of cargo build target folder if not in current dir
+#              (if it's in a workspace, it may be elsewhere)
+# WASM_TARGET - type of wasm file, defaults to wasm32-unknown-unknown
+#
+
+KEYDIR    ?= .keys
+CARGO     ?= cargo
+WASH      ?= wash
+# location of cargo output files
+TARGET_DIR ?= target
+# location of wasm file after build and signing
+DIST_WASM ?= build/$(PROJECT)_s.wasm
+WASM_TARGET ?= wasm32-unknown-unknown
+ACTOR_NAME  ?= $(PROJECT)
+UNSIGNED_WASM = $(TARGET_DIR)/$(WASM_TARGET)/release/$(PROJECT).wasm
+
+# verify all required variables are set
+check-var-defined = $(if $(strip $($1)),,$(error Required variable "$1" is not defined))
+
+$(call check-var-defined,PROJECT)
+$(call check-var-defined,CLAIMS)
+$(call check-var-defined,VERSION)
+$(call check-var-defined,REVISION)
+$(call check-var-defined,REG_URL)
+$(call check-var-defined,PUSH_REG_CMD)
+
+all:: $(DIST_WASM)
+
+# default target is signed wasm file
+# sign it
+$(DIST_WASM): $(UNSIGNED_WASM) Makefile
+	@mkdir -p $(dir $@)
+	$(WASH) claims sign $< \
+		$(foreach claim,$(CLAIMS), -c $(claim) ) \
+		--name $(ACTOR_NAME) --ver $(VERSION) --rev $(REVISION) \
+		$(if $(ACTOR_ALIAS),--call-alias $(ACTOR_ALIAS)) \
+		--destination $@
+
+# rules to print file name and path of build target
+target-path:
+	@echo $(DIST_WASM)
+target-path-abs:
+	@echo $(abspath $(DIST_WASM))
+target-file:
+	@echo $(notdir $(DIST_WASM))
+
+# the wasm should be rebuilt if any source files or dependencies change
+$(UNSIGNED_WASM): .FORCE
+	$(CARGO) build --release
+
+# push signed wasm file to registry
+push: $(DIST_WASM)
+	$(PUSH_REG_CMD) $(DIST_WASM)
+
+# tell host to start an instance of the actor
+start:
+	$(WASH) ctl start actor $(REG_URL) --timeout-ms 3000
+
+# NOT WORKING - live actor updates not working yet
+# update it (should update revision before doing this)
+#update:
+#	$(PUSH_REG_CMD) $(DIST_WASM)
+#	$(WASH) ctl update actor  \
+#        $(shell $(WASH) ctl get hosts -o json | jq -r ".hosts[0].id") \
+#	    $(shell make --silent actor_id) \
+#	    $(REG_URL) --timeout-ms 3000
+
+inventory:
+	$(WASH) ctl get inventory $(shell $(WASH) ctl get hosts -o json | jq -r ".hosts[0].id")
+
+ifneq ($(wildcard test-options.json),)
+# if this is a test actor, run its start method
+# project makefile can set RPC_TEST_TIMEOUT_MS to override default
+RPC_TEST_TIMEOUT_MS ?= 2000
+test::
+	$(WASH) call --test --data test-options.json --rpc-timeout-ms $(RPC_TEST_TIMEOUT_MS) \
+	    $(shell make --silent actor_id) \
+	    Start
+endif
+
+# generate release build
+release::
+	cargo build --release
+
+# standard rust commands
+check clippy doc:
+	$(CARGO) $@
+
+# remove 
+clean::
+	$(CARGO) clean
+	rm -rf build
+
+inspect claims: $(DIST_WASM)
+	$(WASH) claims inspect $(DIST_WASM)
+
+# need a signed wasm before we can print the id
+_actor_id: $(DIST_WASM)
+	@$(WASH) claims inspect $(DIST_WASM) -o json | jq -r .module
+
+actor_id:
+	@echo $(shell make --silent _actor_id 2>/dev/null | tail -1)
+
+ifeq ($(wildcard codegen.toml),codegen.toml)
+# if there are interfaces here, enable lint and validate rules
+lint validate::
+	$(WASH) $@
+else
+lint validate::
+
+endif
+
+.PHONY: actor_id check clean clippy doc release test update .FORCE
diff --git a/actor/animal-image-downloader/src/lib.rs b/actor/animal-image-downloader/src/lib.rs
new file mode 100644
index 00000000..11ed78e3
--- /dev/null
+++ b/actor/animal-image-downloader/src/lib.rs
@@ -0,0 +1,108 @@
+use serde_json::Value;
+use wasmbus_rpc::actor::prelude::*;
+use wasmcloud_interface_blobstore::{Blobstore, BlobstoreSender, Chunk, PutObjectRequest};
+use wasmcloud_interface_httpclient::{HttpClient, HttpClientSender, HttpRequest, HttpResponse};
+use wasmcloud_interface_messaging::{
+    MessageSubscriber, MessageSubscriberReceiver, Messaging, MessagingSender, PubMessage,
+    SubMessage,
+};
+
+const REQUEST_PREFIX: &str = "wasmcloud.animal.";
+const CAT_URL: &str = "https://api.thecatapi.com/v1/images/search";
+const DOG_URL: &str = "https://dog.ceo/api/breeds/image/random";
+const UNKNOWN_IMAGE_URL: &str = "https://i.imgur.com/WQxgQUb.jpg";
+const ANIMALS_CONTAINER: &str = "animalpics";
+
+#[derive(Debug, Default, Actor, HealthResponder)]
+#[services(Actor, MessageSubscriber)]
+struct AnimalImageDownloaderActor {}
+
+#[async_trait]
+impl MessageSubscriber for AnimalImageDownloaderActor {
+    async fn handle_message(&self, ctx: &Context, msg: &SubMessage) -> RpcResult<()> {
+        let client = HttpClientSender::new();
+
+        // Depending on the message, use public APIs to determine the image URL of an animal picture
+        let api_response = client
+            .request(ctx, &HttpRequest::get(&animal_req_url(&msg.subject)))
+            .await?;
+        let animal_image_url = parse_api_response(api_response);
+
+        // Download the animal picture from the specified URL
+        let img = client
+            .request(ctx, &HttpRequest::get(&animal_image_url))
+            .await?;
+
+        let blobstore = BlobstoreSender::new();
+        // Ensure the container is created to hold the picture
+        if !blobstore
+            .container_exists(ctx, &ANIMALS_CONTAINER.to_string())
+            .await?
+        {
+            blobstore
+                .create_container(ctx, &ANIMALS_CONTAINER.to_string())
+                .await?
+        }
+
+        // Upload the picture to the blobstore
+        blobstore
+            .put_object(
+                ctx,
+                &PutObjectRequest {
+                    chunk: Chunk {
+                        container_id: ANIMALS_CONTAINER.to_string(),
+                        object_id: "animal.png".to_string(),
+                        bytes: img.body,
+                        offset: 0,
+                        is_last: true,
+                    },
+                    content_type: Some("image/png".to_string()),
+                    ..Default::default()
+                },
+            )
+            .await?;
+
+        // Reply to the request noting that the animal picture is ready
+        if let Some(reply_to) = msg.reply_to.as_ref() {
+            MessagingSender::new()
+                .publish(
+                    ctx,
+                    &PubMessage {
+                        subject: reply_to.to_string(),
+                        reply_to: None,
+                        body: "Enjoy your animal picture 🐶🐱".to_string().into_bytes(),
+                    },
+                )
+                .await?;
+        }
+
+        Ok(())
+    }
+}
+
+/// Helper function to transform incoming message topic to a URL to request
+fn animal_req_url(topic: &str) -> String {
+    match topic.trim_start_matches(REQUEST_PREFIX) {
+        "cat" => CAT_URL,
+        "dog" => DOG_URL,
+        _ => UNKNOWN_IMAGE_URL,
+    }
+    .to_string()
+}
+
+/// Helper function to parse thecatapi / dog.ceo API responses for the
+/// embedded image_url
+fn parse_api_response(api_response: HttpResponse) -> String {
+    match serde_json::from_slice::<Value>(&api_response.body) {
+        Ok(v) => {
+            if let Value::String(image_url) = &v["message"] {
+                image_url.to_string()
+            } else if let Some(Value::String(image_url)) = v[0].get("url") {
+                image_url.to_string()
+            } else {
+                UNKNOWN_IMAGE_URL.to_string()
+            }
+        }
+        _ => UNKNOWN_IMAGE_URL.to_string(),
+    }
+}