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Add list and del commands #13

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Mar 3, 2024
Merged

Add list and del commands #13

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72 changes: 50 additions & 22 deletions examples/kv.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4,45 +4,62 @@

#include "kv.h"

struct TWriteKvEntry: public TLogEntry {
uint16_t KeySize;
uint16_t ValSize;
struct TKvEntry {
uint16_t KeySize = 0;
uint16_t ValSize = 0;
char Data[0];
};

struct TWriteKv: public TCommandRequest {
uint16_t KeySize;
uint16_t ValSize;
char Data[0];
struct TKvLogEntry: public TLogEntry, public TKvEntry
{
};

struct TWriteKv: public TCommandRequest, public TKvEntry
{
};

struct TReadKv: public TCommandRequest {
uint16_t KeySize;
uint16_t KeySize = 0;
char Data[0];
};

TMessageHolder<TMessage> TKv::Read(TMessageHolder<TCommandRequest> message, uint64_t index) {
auto readKv = message.Cast<TReadKv>();
std::string_view k(readKv->Data, readKv->KeySize);
auto it = H.find(std::string(k));
if (it == H.end()) {
auto res = NewHoldedMessage<TCommandResponse>(sizeof(TCommandResponse));
if (readKv->KeySize == 0) {
std::string data;
for (auto& [k, v] : H) {
data += k + "=" + v + ",";
}
auto res = NewHoldedMessage<TCommandResponse>(sizeof(TCommandResponse) + data.size());
memcpy(res->Data, data.data(), data.size());
res->Index = index;
return res;
} else {
auto res = NewHoldedMessage<TCommandResponse>(sizeof(TCommandResponse)+it->second.size());
res->Index = index;
memcpy(res->Data, it->second.data(), it->second.size());
return res;
std::string_view k(readKv->Data, readKv->KeySize);
auto it = H.find(std::string(k));
if (it == H.end()) {
auto res = NewHoldedMessage<TCommandResponse>(sizeof(TCommandResponse));
res->Index = index;
return res;
} else {
auto res = NewHoldedMessage<TCommandResponse>(sizeof(TCommandResponse)+it->second.size());
res->Index = index;
memcpy(res->Data, it->second.data(), it->second.size());
return res;
}
}
}

void TKv::Write(TMessageHolder<TLogEntry> message, uint64_t index) {
if (LastAppliedIndex < index) {
auto writeKv = message.Cast<TWriteKvEntry>();
std::string_view k(writeKv->Data, writeKv->KeySize);
std::string_view v(writeKv->Data + writeKv->KeySize, writeKv->ValSize);
H[std::string(k)] = std::string(v);
auto entry = message.Cast<TKvLogEntry>();
std::string_view k(entry->TKvEntry::Data, entry->KeySize);
if (entry->ValSize) {
std::string_view v(entry->TKvEntry::Data + entry->KeySize, entry->ValSize);
H[std::string(k)] = std::string(v);
} else {
H.erase(std::string(k));
}
LastAppliedIndex = index;
}
}
Expand Down Expand Up @@ -87,8 +104,8 @@ NNet::TVoidTask Client(TPoller& poller, TSocket socket) {
mes->Flags = TCommandRequest::EWrite;
mes->KeySize = keySize;
mes->ValSize = valSize;
memcpy(mes->Data, key, keySize);
memcpy(mes->Data+keySize, val, valSize);
memcpy(mes->TKvEntry::Data, key, keySize);
memcpy(mes->TKvEntry::Data+keySize, val, valSize);
req = mes;
} else if (!strcmp(prefix, "get")) {
auto key = strtok(nullptr, sep);
Expand All @@ -97,6 +114,17 @@ NNet::TVoidTask Client(TPoller& poller, TSocket socket) {
mes->KeySize = size;
memcpy(mes->Data, key, size);
req = mes;
} else if (!strcmp(prefix, "list")) {
req = NewHoldedMessage<TReadKv>(sizeof(TReadKv));
} else if (!strcmp(prefix, "del")) {
auto key = strtok(nullptr, sep);
auto size = strlen(key);
auto mes = NewHoldedMessage<TWriteKv>(sizeof(TWriteKv) + size);
mes->Flags = TCommandRequest::EWrite;
mes->KeySize = size;
mes->ValSize = 0;
memcpy(mes->TKvEntry::Data, key, size);
req = mes;
} else {
std::cout << "Cannot parse command: " << strLine << "\n";
}
Expand Down
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