So basically, send val as a string, and even when we receive it on the
server side, I can store it in my key-value store as a string too? (Right
now I'm storing it as a char*)
On Thursday, December 3, 2020 at 4:04:02 PM UTC tobias.krueger wrote:
> The std::string, which is used as the container for the grpc datatype
> "bytes", can handle embedded nul bytes.
> But In your "Put" method you pass the parameter "val" as char * pointer.
> This char * pointer will be converted to a std::string terminating with
> the first occurrence of the nul byte.
>
> So must either past the value "val" as std::string or std::vector<char>
>
> HTH
> Tobias
>
> On Thursday, December 3, 2020 at 4:59:05 PM UTC+1 Joseph Liu wrote:
>
>> So I'm using gRPC to store data in a key-value store.
>>
>> The protos look like this:
>>
>> syntax = "proto3";
>>
>> package keyvaluestore;
>>
>> service KeyValueStore {
>> rpc AddUser(Credentials) returns (Response) {}
>> rpc Get(Request) returns (Response) {}
>> rpc Put(Request) returns (Response) {}
>> rpc Cput(Request) returns (Response) {}
>> rpc Delete(Request) returns (Response) {}
>> }
>>
>> message Credentials {
>> string user = 1;
>> string passwd = 2;
>> }
>>
>> message Request {
>> string user = 1;
>> string key = 2;
>> bytes val = 3;
>> bytes val2 = 4;
>> string addr = 5;
>> }
>>
>> message Response {
>> bytes val = 1;
>> uint32 nbytes = 2;
>> string message = 3;
>> }
>>
>> Right now, the issue is that if we send over say, an image as byte data
>> which can include the null byte, then when the server receives it in the
>> `Request` object, it treats it as a string; when it does this it only reads
>> it up the the first null byte.
>>
>> How we pack the `Request` object on the client side:
>>
>> bool KeyValueStoreClient::Put(const string& user, const string& key,
>> const char* val) {
>> Request req;
>> req.set_user(user);
>> req.set_key(key);
>> req.set_val(val);
>>
>> ClientContext ctx;
>> Response res;
>> Status status = stub_->Put(&ctx, req, &res);
>> }
>>
>> Server receives `req->val()` as a string instead of `char*`:
>>
>> Status KeyValueStoreServiceImpl::Put(ServerContext* ctx, const
>> Request* req, Response* res) {
>> // req->val() is a string
>>
>> }
>>
>>
>>
>>
>>
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