From 3c9964b0cb42da9a1b3646853d2be3d8912e40f1 Mon Sep 17 00:00:00 2001
From: xdrm-brackets <doowap31@gmail.com>
Date: Sun, 22 Apr 2018 21:46:31 +0200
Subject: [PATCH] [server:server] created struct 'T' + constructor 'New' +
 signature for 'HandleRequest(req, res)' [server:server.internal] created
 'fetch()' and 'store()'

---
 src/git.xdrm.io/schastsp/server/server.go     | 77 +++++++++++++++++++
 .../schastsp/server/server.internal.go        | 65 ++++++++++++++++
 2 files changed, 142 insertions(+)
 create mode 100644 src/git.xdrm.io/schastsp/server/server.go
 create mode 100644 src/git.xdrm.io/schastsp/server/server.internal.go

diff --git a/src/git.xdrm.io/schastsp/server/server.go b/src/git.xdrm.io/schastsp/server/server.go
new file mode 100644
index 0000000..6d8f16c
--- /dev/null
+++ b/src/git.xdrm.io/schastsp/server/server.go
@@ -0,0 +1,77 @@
+package server
+
+import (
+	"io"
+	"os"
+	"path/filepath"
+	"errors"
+	"git.xdrm.io/schastsp/context"
+)
+
+const DEBUG = true
+
+/* (1) Structure
+---------------------------------------------------------*/
+type T struct {
+	ctx      *context.T // shared context
+	hash     []byte     // current key
+	conf	 string     // configuration file path
+}
+
+
+/* (2) Constructor
+*
+* @ctx<context.T>					Shared context
+* @savePath<string>					Configuration file path
+*
+---------------------------------------------------------*/
+func New(ctx *context.T, savePath string) (*T, error) {
+
+	inst := new(T)
+
+	/* (1) Store context */
+	if ctx == nil { return nil, errors.New("Context must not be nil"); }
+	inst.ctx = ctx;
+
+	/* (2) Get absolute file path */
+	absolutePath, err := filepath.Abs(savePath);
+	if err != nil { return nil, err; }
+
+	/* (3) Check file */
+	info, err := os.Stat(absolutePath);
+	if err != nil {
+
+		// Unknown error
+		if !os.IsNotExist(err) { return nil, err }
+
+		// File does not exist -> try to create file
+		_, err2 := os.Create(absolutePath);
+		if err2 != nil { return nil, err2 }
+
+	// fail if exists but not regular file
+	} else if !info.Mode().IsRegular() {
+		return nil, errors.New("Configuration file is not a regular file");
+	}
+
+	/* (4) Store file path */
+	inst.conf = absolutePath;
+
+	/* (5) Try to fetch hash from conf */
+	err = inst.fetch();
+	if err != nil { return nil, err }
+
+	return inst, nil;
+
+}
+
+
+
+/* (3) Handle request and send response
+*
+* @req<io.Reader>					Request reader
+* @res<io.Writer>					Response Writer
+*
+* @return err<error>				Error or NIL if not
+*
+---------------------------------------------------------*/
+func (s *T) HandleRequest(req io.Reader, res io.Writer) error { return nil }
\ No newline at end of file
diff --git a/src/git.xdrm.io/schastsp/server/server.internal.go b/src/git.xdrm.io/schastsp/server/server.internal.go
new file mode 100644
index 0000000..634779a
--- /dev/null
+++ b/src/git.xdrm.io/schastsp/server/server.internal.go
@@ -0,0 +1,65 @@
+package server
+
+import (
+	"git.xdrm.io/schastsp/lib/scha"
+	"encoding/binary"
+	"os"
+	"errors"
+)
+
+/* (1) Store hash into file
+*
+* @return err<error>			Error or NIL if not
+*
+---------------------------------------------------------*/
+func (s T) store() error {
+
+	/* (1) Try to open file for writing */
+	file, err := os.OpenFile(s.conf, os.O_RDWR|os.O_CREATE, 0755)
+	if err != nil { return err }
+
+	/* (2) Defer close */
+	defer file.Close();
+
+	/* (3) Write hash into file */
+	err = binary.Write(file, binary.BigEndian, s.hash)
+	if err != nil { return err }
+
+	return nil
+
+}
+
+
+
+
+
+/* (2) Fetch hash from file
+*
+* @return err<error>			Error or NIL if not
+*
+---------------------------------------------------------*/
+func (s *T) fetch() error {
+
+	/* (1) Try to open file for reading */
+	file, err := os.Open(s.conf)
+	if err != nil { return err }
+
+	/* (2) Defer close */
+	defer file.Close();
+
+	/* (3) Try to fetch hash from file */
+	fetchedHash := make([]byte, scha.HSIZE)
+	err = binary.Read(file, binary.BigEndian, s.hash)
+	if err != nil { return err }
+
+	/* (4) Fail if wrong size */
+	if uint16(len(fetchedHash)) != scha.HSIZE {
+		return errors.New("Invalid hash size in file")
+	}
+
+	/* (5) Copy fetched hash into real one */
+	s.hash = fetchedHash
+
+	return nil
+
+}
\ No newline at end of file