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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 {
const rep = redis.redisCommand(connection, "SET %b:%b %b EX %d",
topic.ptr, topic.len,
message.Key.ptr, message.Key.len,
message.Value.ptr, message.Value.len,
message.SecondsToLive);
if (rep != null) {
redis.freeReplyObject(rep);
}
}
pub fn ReadFromTopic(allocator: std.mem.Allocator, topic: []const u8, Key: []const u8) !?[]const u8 {
const raw = redis.redisCommand(connection, "GET %b:%b",
topic.ptr, topic.len,
Key.ptr, Key.len);
if (raw == null) {
return null;
}
defer {
redis.freeReplyObject(raw);
}
const resp: *redis.redisReply = @alignCast(@ptrCast(raw));
if (resp.type != redis.REDIS_REPLY_STRING) {
return null;
}
return try allocator.dupe(u8, resp.str[0..resp.len]);
}
test "Redis connection" {
try Connect();
defer Disconnect();
try WriteToTopic("test", Message {
.Key = "key",
.Value = "value",
.SecondsToLive = 1,
});
const alloc = std.testing.allocator;
var resp = try ReadFromTopic(alloc, "test", "key");
try std.testing.expectEqualStrings("value", resp orelse "not found");
std.Thread.sleep(1_500_000_000);
// KVP TTL check
if (resp) |r| {
alloc.free(r);
}
resp = try ReadFromTopic(alloc, "test", "key");
try std.testing.expectEqualStrings("not found", resp orelse "not found");
if (resp) |r| {
defer alloc.free(r);
}
}
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