1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
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,
SecondsToLive: u16
};
pub fn WriteToTopic(topic: []const u8, message: Message) !void {
_ = redis.redisCommand(connection, "SET %s:%s %s EX %d",
topic.ptr,
message.Key.ptr,
message.Value.ptr,
message.SecondsToLive);
}
pub fn ReadFromTopic(topic: []const u8, Key: []const u8) ?[]const u8 {
const raw = redis.redisCommand(connection, "GET %s:%s",
topic.ptr,
Key.ptr);
if (raw == null) {
return null;
}
const resp: *redis.redisReply = @alignCast(@ptrCast(raw));
if (resp.type != redis.REDIS_REPLY_STRING) {
return null;
}
return std.mem.span(resp.str);
}
test "Redis connection" {
try Connect();
defer Disconnect();
try WriteToTopic("test", Message {
.Key = "key",
.Value = "value",
.SecondsToLive = 1,
});
try std.testing.expectEqualStrings("value", ReadFromTopic("test", "key") orelse "not found");
std.Thread.sleep(1_500_000_000);
// KVP TTL check
try std.testing.expectEqualStrings("not found", ReadFromTopic("test", "key") orelse "not found");
}
|
