cmd/resolver: implement caches command

The caches command fetch and print all caches from rescached server.

1 files changed, 60 insertions, 0 deletions

diff --git a/client.go b/client.go
new file mode 100644
index 0000000..0d626f1
--- /dev/null
+++ b/client.go
@@ -0,0 +1,60 @@
+// SPDX-FileCopyrightText: 2022 M. Shulhan <ms@kilabit.info>
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+package rescached
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"github.com/shuLhan/share/lib/dns"
+	libhttp "github.com/shuLhan/share/lib/http"
+)
+
+// Client for rescached.
+type Client struct {
+	*libhttp.Client
+}
+
+// NewClient create new HTTP client that connect to rescached HTTP server.
+func NewClient(serverUrl string, insecure bool) (cl *Client) {
+	var (
+		httpcOpts = libhttp.ClientOptions{
+			ServerUrl:     serverUrl,
+			AllowInsecure: insecure,
+		}
+	)
+	cl = &Client{
+		Client: libhttp.NewClient(&httpcOpts),
+	}
+	return cl
+}
+
+// Caches fetch all of non-local caches from server.
+func (cl *Client) Caches() (answers []*dns.Answer, err error) {
+	var (
+		logp = "Caches"
+		res  = libhttp.EndpointResponse{
+			Data: &answers,
+		}
+
+		resb []byte
+	)
+
+	_, resb, err = cl.Get(apiCaches, nil, nil)
+	if err != nil {
+		return nil, fmt.Errorf("%s: %w", logp, err)
+	}
+
+	err = json.Unmarshal(resb, &res)
+	if err != nil {
+		return nil, fmt.Errorf("%s: %w", logp, err)
+	}
+
+	if res.Code != http.StatusOK {
+		return nil, fmt.Errorf("%s: %s", logp, res.Code, res.Message)
+	}
+
+	return answers, nil
+}