Start to support a faucet for SPN sending

.github/workflows/deploy-faucet.yml

@@ -0,0 +1,57 @@
+name: Deploy Faucet Lambda
+
+on:
+  push:
+    branches:
+      - development
+    paths:
+      - 'cmd/faucet.superposition/**'
+
+jobs:
+  deploy:
+    runs-on: ubuntu-latest
+
+    steps:
+      - id: go-cache-paths
+        run: |
+          echo "::set-output name=go-build::$(go env GOCACHE)"
+          echo "::set-output name=go-mod::$(go env GOMODCACHE)"
+
+      - name: Checkout code
+        uses: actions/checkout@v2
+
+      - name: Go Build Cache
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.go-cache-paths.outputs.go-build }}
+          key: ${{ runner.os }}-go-build-${{ hashFiles('**/go.sum') }}
+
+      - name: Go Mod Cache
+        uses: actions/cache@v2
+        with:
+          path: ${{ steps.go-cache-paths.outputs.go-mod }}
+          key: ${{ runner.os }}-go-mod-${{ hashFiles('**/go.sum') }}
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: '1.21.1'
+
+      - name: Install dependencies
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y zip
+
+      - name: Build lambda zip
+        run: |
+          cd cmd/faucet.superposition
+          make lambda
+
+      - name: Deploy to AWS Lambda
+        env:
+          AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
+          AWS_SECRET_ACCESS_KEY: ${{ secrets.AWS_SECRET_ACCESS_KEY }}
+          AWS_REGION: ap-southeast-2
+        run: |
+          aws lambda update-function-code --function-name faucet-superposition \
+          --zip-file fileb://cmd/faucet.superposition/bootstrap.zip >&2 >/dev/null

.github/workflows/deploy-graphql-http.yml

@@ -1,4 +1,4 @@
-name: Deploy Lambda
+name: Deploy GraphQL Lambda
 
 on:
   push:

cmd/faucet.superposition/.gitignore

@@ -0,0 +1,4 @@
+faucet.superposition
+bootstrap
+bootstrap.zip
+stakers.json

cmd/faucet.superposition/Makefile

@@ -0,0 +1,17 @@
+
+EXTRA_FILES := stakers.json
+
+include ../golang.mk
+
+.PHONY: lambda
+
+lambda: bootstrap.zip
+
+stakers.json: ../../config/stakers.json
+	@cp ../../config/stakers.json stakers.json
+
+bootstrap: faucet.superposition
+	@cp faucet.superposition bootstrap
+
+bootstrap.zip: bootstrap
+	@zip bootstrap.zip bootstrap

cmd/faucet.superposition/README.md

@@ -0,0 +1,12 @@
+
+# GraphQL Faucet interface
+
+Listens for a mutation to request tokens, and sends the SPN token for Superposition
+Testnet on demand. With a feature flag optionally supports gating the amount of tokens
+send to a list of users.
+
+## Features
+
+|         Name          |                      Description                       |
+|-----------------------|--------------------------------------------------------|
+| `faucet stakers only` | Sends only to the list of stakers in the stakers file. |

cmd/faucet.superposition/deploy-lambda.sh

@@ -0,0 +1,7 @@
+#!/bin/sh -eu
+
+function_name="$1"
+
+aws lambda update-function-code \
+	--function-name "$function_name" \
+	--zip-file "$zip_file"

cmd/faucet.superposition/gqlgen.yml

@@ -0,0 +1,26 @@
+schema:
+  - ./*.graphqls
+
+exec:
+  filename: graph/generated.go
+  package: graph
+
+model:
+  filename: graph/model/models_gen.go
+  package: model
+
+resolver:
+  layout: follow-schema
+  dir: graph
+  package: graph
+  filename_template: "{name}.resolvers.go"
+  # Optional: turn on to not generate template comments above resolvers
+  # omit_template_comment: false
+
+omit_slice_element_pointers: true
+
+struct_fields_always_pointers: false
+
+resolvers_always_return_pointers: false
+
+return_pointers_in_unmarshalinput: false