redis scan command support #678

lukemakeit · 2023-01-04T11:39:43Z

Problem

redis scan command not support.

Solution

Note:
server_idx is saved by the lowest 12 bits of cursor, so the number of servers of the twemproxy must be less than 4096.

Result

1.1.1.1:60100> scan 0
1) "1"
2) 1) "d"
   2) "b"
   3) "c"
   4) "a"
1.1.1.1:60100> scan 1
1) "0"
2) 1) "a"
   2) "b"

w4096 · 2023-01-04T16:37:26Z

src/nc_server.c

+        r->max_server_idx=(pool->server).nelem;
+    }else{
+        idx = server_pool_idx(pool, key, keylen);
+    }


Change the cursor of request in req_filter and save the server_index on msg in the mean time.

w4096 · 2023-01-04T16:46:40Z

src/proto/nc_redis.c

    }
 }

+void redis_post_coalesce_scan(struct msg *request) {


move those code in rsp_filter

w4096 · 2023-01-04T16:50:57Z

src/proto/nc_redis.c

        return redis_fragment_argx(r, nserver, frag_msgq, 2);

+    case MSG_REQ_REDIS_SCAN:
+        return redis_fragment_scan(r,frag_msgq);


The scan command doesn't need fragment, the thing you want do is change the cursor, you can do this in req_filter.
When response received you need change the cursor again, you can do this in rsp_filter.

w4096 · 2023-01-04T16:52:28Z

src/nc_server.h


 uint32_t server_pool_idx(const struct server_pool *pool, const uint8_t *key, uint32_t keylen);
-struct conn *server_pool_conn(struct context *ctx, struct server_pool *pool, const uint8_t *key, uint32_t keylen);
+struct conn *server_pool_conn(struct context *ctx, struct server_pool *pool, const uint8_t *key, uint32_t keylen, struct msg *msg);


I think put msg in front of key and keylen is better.

w4096 · 2023-01-04T16:58:13Z

src/nc_server.c

+            nc_memcpy(key,arr,keylen);
+        }
+        r->scan_server_idx=idx;
+        r->max_server_idx=(pool->server).nelem;


I think max_server_idx is unnecessary, since you can always known the number of server by array_n(&pool->server) .

lukemakeit · 2023-01-09T07:06:11Z

Hi @wy-ei , I have re-committed according to your suggestion, thanks.

w4096 · 2023-01-13T14:18:56Z

src/nc_request.c

    }

+    if (msg->type == MSG_REQ_REDIS_SCAN) {
+        ASSERT(array_n(msg->keys) > 0);


move this into a function and call the function here like what you did in rsp_filter.

Good advice

w4096 · 2023-01-13T14:25:22Z

src/nc_message.h

    unsigned             redis:1;         /* redis? */
+
+    uint32_t             server_index; /* used for store the redis server index in server pool */
 };


this comment is not clear enough. how about this one:

the server index which the requstion should be forwarded.

this comment is not clear enough. how about this one:

the server index which the requstion should be forwarded.

ok

w4096 · 2023-01-13T14:40:17Z

@lukexwang

I have see the change you made. it's better. And I think the code can be optimized again. I have leave some more suggestions.

lukemakeit · 2023-01-14T09:30:08Z

Hi @wy-ei , thank you for your suggestion. I have re-committed.

lukemakeit · 2023-02-07T07:43:20Z

Hello @wy-ei , 空了辛苦看下哈 ^_^

yuerugou54 · 2023-02-07T07:44:24Z

马晓栋已经收到您的来件，谢谢!

redis script command support

…add-scan-support

lukemakeit added 2 commits January 4, 2023 15:29

redis script command support

fa1a7a7

redis scan command support

6e45af7

w4096 reviewed Jan 4, 2023

View reviewed changes

Apply suggestions from code review

4ed8a9e

w4096 reviewed Jan 13, 2023

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Apply suggestions from code review

b6e9807

lukemakeit and others added 3 commits February 26, 2024 22:42

Merge pull request #1 from lukemakeit/add-script-support

3f904e2

redis script command support

Merge branch 'master' of https://github.com/lukexwang/twemproxy into …

6d3304f

…add-scan-support

fix a scan bug and update readme

758cb66

redis scan command support #678

Are you sure you want to change the base?

redis scan command support #678

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lukemakeit commented Jan 4, 2023

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lukemakeit commented Jan 9, 2023

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w4096 commented Jan 13, 2023 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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lukemakeit commented Jan 14, 2023

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lukemakeit commented Feb 7, 2023

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yuerugou54 commented Feb 7, 2023 via email

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w4096 commented Jan 13, 2023 •

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