redis connection

5 files changed, 67 insertions, 5 deletions

diff --git a/backend/Makefile b/backend/Makefile
index 5d8bdb4..e0f60e8 100644
--- a/backend/Makefile
+++ b/backend/Makefile
@@ -3,3 +3,8 @@ all:
 
 test:
 	zig build test
+
+# It is important that this comand only runs on unix machines
+deps:
+	git clone https://github.com/redis/hiredis
+	cd hiredis; sudo make install
diff --git a/backend/build.zig b/backend/build.zig
index 648b332..7310e6f 100644
--- a/backend/build.zig
+++ b/backend/build.zig
@@ -93,21 +93,21 @@ pub fn build(b: *std.Build) void {
         .target = target,
         .optimize = optimize,
     });
-
     exe.root_module.addImport("httpz", httpz.module("httpz"));
 
-
     // postgres driver
-    
     const pg_module = b.dependency("pg", .{}).module("pg");
-
     exe.root_module.addImport("pg", pg_module);
 
     // .env
-
     const dotenv_module = b.dependency("dotenv", .{}).module("dotenv");
     exe.root_module.addImport("dotenv", dotenv_module);
 
+    // Redis
+    exe.root_module.linkSystemLibrary("hiredis", .{
+        .needed = true,
+    });
+
     // This creates a top level step. Top level steps have a name and can be
     // invoked by name when running `zig build` (e.g. `zig build run`).
     // This will evaluate the `run` step rather than the default step.
diff --git a/backend/build.zig.zon b/backend/build.zig.zon
index 911bb3d..b1423b1 100644
--- a/backend/build.zig.zon
+++ b/backend/build.zig.zon
@@ -44,6 +44,10 @@
             .url = "git+https://github.com/zigster64/dotenv.zig?ref=main#7d50f9fe0ce223d94d180d5a5a49fe0df5bc3743",
             .hash = "dotenv-0.1.0-Q9TxeuEMAADw6cHl9uKbjwunS0PlYYc1yw9Ol82TwAAm",
         },
+        .okredis = .{
+            .url = "git+https://github.com/kristoff-it/zig-okredis?ref=master#f00a50311e5fcc5a688fc027bd0a7ebbe8e2f0cc",
+            .hash = "okredis-0.1.0-Cg726sgHBAClOCW_xaaqoS6m_uyiw3iD9Qj20AAzGcTL",
+        },
     },
     .paths = .{
         "build.zig",
diff --git a/backend/src/Redis/Connection.zig b/backend/src/Redis/Connection.zig
new file mode 100644
index 0000000..bde187b
--- /dev/null
+++ b/backend/src/Redis/Connection.zig
@@ -0,0 +1,42 @@
+const std = @import("std");
+const redis = @cImport(
+    @cInclude("hiredis/hiredis.h")
+    );
+
+var connection: ?*redis.redisContext = undefined;
+const addr: [*]const u8 = "127.0.0.1";
+const port: u16 = 6379;
+
+pub fn Connect() !void {
+    connection = redis.redisConnect(addr, port);
+    if (connection == null or connection.?.err != 0) {
+        if (connection != null) {
+            @panic(&connection.?.errstr);
+        }
+        @panic("The redis connection failed: general error");
+    }
+}
+
+pub fn Disconnect() void {
+    redis.redisFree(connection);
+}
+
+pub const Message = struct {
+    Key: []const u8,
+    Value: []const u8
+};
+
+pub fn WriteToTopic(topic: []const u8, message: Message) !void {
+    _ = redis.redisCommand(connection, "SET %s:%s %s", 
+        topic.ptr,
+        message.Key.ptr,
+        message.Value.ptr); 
+}
+
+pub fn ReadFromTopic(topic: []const u8, Key: []const u8) !?[]const u8 {
+    const resp: *redis.redisReply = @alignCast(@ptrCast(redis.redisCommand(connection, "GET %s:%s", 
+        topic.ptr,
+        Key.ptr)));
+    return std.mem.span(resp.str);
+}
+
diff --git a/backend/src/main.zig b/backend/src/main.zig
index db48a38..d1fbde2 100644
--- a/backend/src/main.zig
+++ b/backend/src/main.zig
@@ -3,6 +3,7 @@ const backend = @import("backend");
 const httpz = @import("httpz");
 const db = @import("Database/Connection.zig");
 const handler = @import("Handler.zig");
+const redis = @import("Redis/Connection.zig");
 
 pub fn main() !void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
@@ -20,6 +21,16 @@ pub fn main() !void {
         server.deinit();
     }
 
+    try redis.Connect();
+    defer redis.Disconnect();
+
+    try redis.WriteToTopic("test", redis.Message {
+        .Key = "xdd",
+        .Value = "ddx",
+    });
+
+    std.debug.print("redis response: {s}\n", .{try redis.ReadFromTopic("test", "xdd") orelse "not found"});
+
     var router = try server.router(.{});
     router.get("/", index, .{});