Token counting proxy

Author: ZIJ

.gitignore

@@ -1,6 +1,9 @@
 # Binaries
 bin/
 dist/
+catty-api
+catty-proxy
+catty-exec-runtime
 *.exe
 *.dll
 *.so

AGENTS.md

@@ -1,4 +1,4 @@
-FROM golang:1.25-bookworm AS builder
+FROM golang:1.25-alpine AS builder
 
 WORKDIR /app
 
@@ -12,12 +12,10 @@ COPY . .
 # Build
 RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o /catty-api ./cmd/catty-api
 
-# Runtime image - minimal for API server
-FROM debian:bookworm-slim
+# Runtime image - minimal Alpine for API server
+FROM alpine:3.21
 
-RUN apt-get update && apt-get install -y --no-install-recommends \
-    ca-certificates \
-    && rm -rf /var/lib/apt/lists/*
+RUN apk add --no-cache ca-certificates
 
 COPY --from=builder /catty-api /usr/local/bin/
 

Dockerfile.api

@@ -0,0 +1,24 @@
+FROM golang:1.25-alpine AS builder
+
+WORKDIR /app
+
+# Copy go mod files
+COPY go.mod go.sum* ./
+RUN go mod download
+
+# Copy source
+COPY . .
+
+# Build
+RUN CGO_ENABLED=0 go build -ldflags="-s -w" -o /catty-proxy ./cmd/catty-proxy
+
+# Runtime image - minimal Alpine for proxy server
+FROM alpine:3.21
+
+RUN apk add --no-cache ca-certificates
+
+COPY --from=builder /catty-proxy /usr/local/bin/
+
+EXPOSE 8080
+
+CMD ["catty-proxy"]

Dockerfile Dockerfile.execDockerfile renamed to Dockerfile.exec

@@ -1,10 +1,10 @@
-.PHONY: build build-cli build-api release clean
+.PHONY: build build-cli build-api build-proxy release clean
 
 VERSION ?= 0.1.0
 LDFLAGS := -ldflags="-s -w -X main.Version=$(VERSION)"
 
 # Build all binaries
-build: build-cli build-api
+build: build-cli build-api build-proxy
 
 # Build CLI for current platform
 build-cli:
@@ -14,6 +14,10 @@ build-cli:
 build-api:
 	go build $(LDFLAGS) -o bin/catty-api ./cmd/catty-api
 
+# Build proxy for current platform
+build-proxy:
+	go build $(LDFLAGS) -o bin/catty-proxy ./cmd/catty-proxy
+
 # Build CLI for all platforms (for releases)
 release:
 	@mkdir -p dist
@@ -25,9 +29,13 @@ release:
 deploy-api:
 	fly deploy -c fly.api.toml
 
+# Deploy proxy to Fly
+deploy-proxy:
+	fly deploy -c fly.proxy.toml
+
 # Deploy executor to Fly
 deploy-exec:
-	fly deploy
+	fly deploy -c fly.exec.toml
 
 # Clean build artifacts
 clean:

Dockerfile.proxy

@@ -78,11 +78,12 @@ Maximum upload size: 100MB
 
 - ~~**Custom domain** - Move away from *.fly.dev URLs~~ ✓
 - ~~**Persistent storage** - PostgreSQL for sessions and users~~ ✓
+- ~~**Usage metering** - Token counting via proxy~~ ✓
 - **Session reconnect** - Reconnect to existing sessions via `catty connect <label>` (WIP - DB done, reconnect buggy)
 - **Progress indicators** - Progress bars for uploads and other long operations
 - **Workspace sync-back** - Stream file changes from remote session back to local
 - **Documentation site** - Comprehensive docs with Mintlify
-- **Usage metering & billing** - Track per-user token usage, free tier + subscription ($25/mo target)
+- **Stripe billing** - Connect usage tracking to payments, free tier + subscription ($25/mo target)
 - **Multi-key support** - Pool of API keys for handling load spikes
 
 ## Development

Makefile

@@ -25,6 +25,18 @@ func main() {
 		addr = ":8080"
 	}
 
+	// Log key env vars for debugging (without exposing full values)
+	if baseURL := os.Getenv("ANTHROPIC_BASE_URL"); baseURL != "" {
+		slog.Info("anthropic config", "base_url", baseURL)
+	}
+	if apiKey := os.Getenv("ANTHROPIC_API_KEY"); apiKey != "" {
+		preview := apiKey
+		if len(apiKey) > 20 {
+			preview = apiKey[:20] + "..."
+		}
+		slog.Info("anthropic config", "api_key_preview", preview, "api_key_length", len(apiKey))
+	}
+
 	server := executor.NewServer()
 
 	httpServer := &http.Server{

README.md

@@ -12,7 +12,7 @@ app = "catty-exec"
 primary_region = "iad"
 
 [build]
-  dockerfile = "Dockerfile"
+  dockerfile = "Dockerfile.exec"
 
 [http_service]
   internal_port = 8080