Docker setup and read yaml

.gitignore

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+# --- OS Generated Files ---
+.DS_Store
+Thumbs.db
+
+# --- Go / Golang ---
+main
+code/main
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+*.test
+*.out
+
+# --- COBOL / C ---
+*.out
+*.o
+*.obj
+*.so
+*.dll
+*.gnt
+*.int
+*.lst
+*.dylib
+
+# --- Environment / Secrets ---
+.env
+.env.*
+!.env.example

Dockerfile

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+FROM golang:latest AS builder
+WORKDIR /app
+COPY code/go.mod code/go.sum ./
+RUN go mod download
+COPY code/main.go .
+RUN CGO_ENABLED=0 GOOS=linux go build -o server main.go
+
+FROM alpine:latest
+RUN apk add --no-cache \
+    gnucobol \
+    gcc \
+    musl-dev
+COPY api.yaml /api.yaml
+COPY src/ /src/
+COPY --from=builder /app/server /server
+EXPOSE 8080
+ENTRYPOINT ["/server"]

code/go.mod

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+module rest-cobol
+
+go 1.26.4
+
+require gopkg.in/yaml.v3 v3.0.1

code/go.sum

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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
+gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

code/main.go

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+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"log"
+	"net/http"
+	"io/ioutil"
+    "gopkg.in/yaml.v3"
+)
+
+type ApiConfig struct {
+	Version   string     `yaml:"version"`
+	Project   string     `yaml:"project"`
+	Endpoints []Endpoint `yaml:"endpoints"`
+}
+
+type Endpoint struct {
+	Path             string     `yaml:"path"`
+	Method           string     `yaml:"method"`
+	CobolSource      string     `yaml:"cobol_source"`
+	Procedure        string     `yaml:"procedure"`
+	Arguments        []Argument `yaml:"arguments"`
+	ResponseCopybook string     `yaml:"response_copybook"`
+}
+
+type Argument struct {
+	Name   string `yaml:"name"`
+	Target string `yaml:"target"`
+	Type   string `yaml:"type"`
+	Source string `yaml:"source"`
+}
+
+func readConf(filename string) (*ApiConfig, error) {
+    buf, err := ioutil.ReadFile(filename)
+    if err != nil {
+        return nil, err
+    }
+
+    c := &ApiConfig{}
+    err = yaml.Unmarshal(buf, c)
+    if err != nil {
+        return nil, fmt.Errorf("in file %q: %w", filename, err)
+    }
+
+    return c, err
+}
+
+func projectHandler(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
+		return
+	}
+
+	w.Header().Set("Content-Type", "application/json")
+
+	api, err := readConf("api.yaml")
+    if err != nil {
+        log.Fatal(err)
+    }
+	
+	response := map[string]string{"project": api.Project}
+	json.NewEncoder(w).Encode(response)
+}
+
+func main() {
+	http.HandleFunc("/project", projectHandler)
+
+	port := ":8080"
+	fmt.Printf("Server starting on port %s...\n", port)
+	if err := http.ListenAndServe(port, nil); err != nil {
+		log.Fatalf("Server failed to start: %v", err)
+	}
+}

justfile

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+# Build the docker image
+build:
+    docker build -t rest-cobol .
+
+# Run the image
+run: build
+    docker run -p 8080:8080 rest-cobol