HrangebyLex supports specify intervals

src/commands/redis_cmd.cc

@@ -1614,34 +1614,39 @@ class CommandHGetAll : public Commander {
   }
 };
 
-class CommandHRange : public Commander {
+class CommandHRangeByLex : public Commander {
  public:
   Status Parse(const std::vector<std::string> &args) override {
-    if (args.size() != 6 && args.size() != 4) {
-      return {Status::RedisParseErr, errWrongNumOfArguments};
+    CommandParser parser(args, 4);
+    while (parser.Good()) {
+      if (parser.EatEqICase("REV")) {
+        spec_.reversed = true;
+      } else if (parser.EatEqICase("LIMIT")) {
+        spec_.offset = GET_OR_RET(parser.TakeInt());
+        spec_.count = GET_OR_RET(parser.TakeInt());
+      } else {
+        return parser.InvalidSyntax();
+      }
     }
-
-    if (args.size() == 6 && Util::ToLower(args[4]) != "limit") {
-      return {Status::RedisInvalidCmd, errInvalidSyntax};
+    Status s;
+    if (spec_.reversed) {
+      s = ParseRangeLexSpec(args[3], args[2], &spec_);
+    } else {
+      s = ParseRangeLexSpec(args[2], args[3], &spec_);
     }
-
-    if (args.size() == 6) {
-      auto parse_result = ParseInt<int64_t>(args_[5], 10);
-      if (!parse_result) return {Status::RedisParseErr, errValueNotInteger};
-
-      limit_ = *parse_result;
+    if (!s.IsOK()) {
+      return Status(Status::RedisParseErr, s.Msg());
     }
-    return Commander::Parse(args);
+    return Status::OK();
   }
 
   Status Execute(Server *svr, Connection *conn, std::string *output) override {
     Redis::Hash hash_db(svr->storage_, conn->GetNamespace());
     std::vector<FieldValue> field_values;
-    auto s = hash_db.Range(args_[1], args_[2], args_[3], limit_, &field_values);
+    rocksdb::Status s = hash_db.RangeByLex(args_[1], spec_, &field_values);
     if (!s.ok()) {
       return {Status::RedisExecErr, s.ToString()};
     }
-
     std::vector<std::string> kv_pairs;
     for (const auto &p : field_values) {
       kv_pairs.emplace_back(p.field);
@@ -1653,7 +1658,7 @@ class CommandHRange : public Commander {
   }
 
  private:
-  int64_t limit_ = LONG_MAX;
+  CommonRangeLexSpec spec_;
 };
 
 class CommandPush : public Commander {
@@ -2674,7 +2679,7 @@ class CommandZIncrBy : public Commander {
 class CommandZLexCount : public Commander {
  public:
   Status Parse(const std::vector<std::string> &args) override {
-    Status s = Redis::ZSet::ParseRangeLexSpec(args[2], args[3], &spec_);
+    Status s = ParseRangeLexSpec(args[2], args[3], &spec_);
     if (!s.IsOK()) {
       return {Status::RedisParseErr, s.Msg()};
     }
@@ -2695,7 +2700,7 @@ class CommandZLexCount : public Commander {
   }
 
  private:
-  ZRangeLexSpec spec_;
+  CommonRangeLexSpec spec_;
 };
 
 class CommandZPop : public Commander {
@@ -2808,9 +2813,9 @@ class CommandZRangeByLex : public Commander {
   Status Parse(const std::vector<std::string> &args) override {
     Status s;
     if (spec_.reversed) {
-      s = Redis::ZSet::ParseRangeLexSpec(args[3], args[2], &spec_);
+      s = ParseRangeLexSpec(args[3], args[2], &spec_);
     } else {
-      s = Redis::ZSet::ParseRangeLexSpec(args[2], args[3], &spec_);
+      s = ParseRangeLexSpec(args[2], args[3], &spec_);
     }
 
     if (!s.IsOK()) {
@@ -2844,7 +2849,7 @@ class CommandZRangeByLex : public Commander {
   }
 
  private:
-  ZRangeLexSpec spec_;
+  CommonRangeLexSpec spec_;
 };
 
 class CommandZRangeByScore : public Commander {
@@ -3031,7 +3036,7 @@ class CommandZRemRangeByScore : public Commander {
 class CommandZRemRangeByLex : public Commander {
  public:
   Status Parse(const std::vector<std::string> &args) override {
-    Status s = Redis::ZSet::ParseRangeLexSpec(args[2], args[3], &spec_);
+    Status s = ParseRangeLexSpec(args[2], args[3], &spec_);
     if (!s.IsOK()) {
       return {Status::RedisParseErr, s.Msg()};
     }
@@ -3051,7 +3056,7 @@ class CommandZRemRangeByLex : public Commander {
   }
 
  private:
-  ZRangeLexSpec spec_;
+  CommonRangeLexSpec spec_;
 };
 
 class CommandZScore : public Commander {
@@ -6420,7 +6425,7 @@ REDIS_REGISTER_COMMANDS(
     MakeCmdAttr<CommandHVals>("hvals", 2, "read-only", 1, 1, 1),
     MakeCmdAttr<CommandHGetAll>("hgetall", 2, "read-only", 1, 1, 1),
     MakeCmdAttr<CommandHScan>("hscan", -3, "read-only", 1, 1, 1),
-    MakeCmdAttr<CommandHRange>("hrange", -4, "read-only", 1, 1, 1),
+    MakeCmdAttr<CommandHRangeByLex>("hrangebylex", -4, "read-only", 1, 1, 1),
 
     MakeCmdAttr<CommandLPush>("lpush", -3, "write", 1, 1, 1), MakeCmdAttr<CommandRPush>("rpush", -3, "write", 1, 1, 1),
     MakeCmdAttr<CommandLPushX>("lpushx", -3, "write", 1, 1, 1),

src/common/range_spec.cc

@@ -0,0 +1,53 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+#include "range_spec.h"
+
+Status ParseRangeLexSpec(const std::string &min, const std::string &max, CommonRangeLexSpec *spec) {
+  if (min == "+" || max == "-") {
+    return Status(Status::NotOK, "min > max");
+  }
+
+  if (min == "-") {
+    spec->min = "";
+  } else {
+    if (min[0] == '(') {
+      spec->minex = true;
+    } else if (min[0] == '[') {
+      spec->minex = false;
+    } else {
+      return Status(Status::NotOK, "the min is illegal");
+    }
+    spec->min = min.substr(1);
+  }
+
+  if (max == "+") {
+    spec->max_infinite = true;
+  } else {
+    if (max[0] == '(') {
+      spec->maxex = true;
+    } else if (max[0] == '[') {
+      spec->maxex = false;
+    } else {
+      return Status(Status::NotOK, "the max is illegal");
+    }
+    spec->max = max.substr(1);
+  }
+  return Status::OK();
+}

src/common/range_spec.h

@@ -0,0 +1,36 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+
+#pragma once
+
+#include <string>
+
+#include "status.h"
+struct CommonRangeLexSpec {
+  std::string min, max;
+  bool minex, maxex; /* are min or max exclusive */
+  bool max_infinite; /* are max infinite */
+  int64_t offset, count;
+  bool removed, reversed;
+  CommonRangeLexSpec()
+      : minex(false), maxex(false), max_infinite(false), offset(-1), count(-1), removed(false), reversed(false) {}
+};
+
+Status ParseRangeLexSpec(const std::string &min, const std::string &max, CommonRangeLexSpec *spec);

src/types/redis_hash.cc

@@ -276,37 +276,65 @@ rocksdb::Status Hash::MSet(const Slice &user_key, const std::vector<FieldValue>
   return storage_->Write(storage_->DefaultWriteOptions(), &batch);
 }
 
-rocksdb::Status Hash::Range(const Slice &user_key, const Slice &start, const Slice &stop, int64_t limit,
-                            std::vector<FieldValue> *field_values) {
+rocksdb::Status Hash::RangeByLex(const Slice &user_key, const CommonRangeLexSpec &spec,
+                                 std::vector<FieldValue> *field_values) {
   field_values->clear();
-  if (start.compare(stop) >= 0 || limit <= 0) {
+  if (spec.count == 0) {
     return rocksdb::Status::OK();
   }
   std::string ns_key;
   AppendNamespacePrefix(user_key, &ns_key);
   HashMetadata metadata(false);
   rocksdb::Status s = GetMetadata(ns_key, &metadata);
   if (!s.ok()) return s.IsNotFound() ? rocksdb::Status::OK() : s;
-  limit = std::min(static_cast<int64_t>(metadata.size), limit);
-  std::string start_key, stop_key;
-  InternalKey(ns_key, start, metadata.version, storage_->IsSlotIdEncoded()).Encode(&start_key);
-  InternalKey(ns_key, stop, metadata.version, storage_->IsSlotIdEncoded()).Encode(&stop_key);
+
+  std::string start_member = spec.reversed ? spec.max : spec.min;
+  std::string start_key, prefix_key, next_version_prefix_key;
+  InternalKey(ns_key, start_member, metadata.version, storage_->IsSlotIdEncoded()).Encode(&start_key);
+  InternalKey(ns_key, "", metadata.version, storage_->IsSlotIdEncoded()).Encode(&prefix_key);
+  InternalKey(ns_key, "", metadata.version + 1, storage_->IsSlotIdEncoded()).Encode(&next_version_prefix_key);
   rocksdb::ReadOptions read_options;
   LatestSnapShot ss(db_);
   read_options.snapshot = ss.GetSnapShot();
-  rocksdb::Slice upper_bound(stop_key);
+  rocksdb::Slice upper_bound(next_version_prefix_key);
   read_options.iterate_upper_bound = &upper_bound;
+  rocksdb::Slice lower_bound(prefix_key);
+  read_options.iterate_lower_bound = &lower_bound;
   read_options.fill_cache = false;
 
   auto iter = DBUtil::UniqueIterator(db_, read_options);
-  iter->Seek(start_key);
-  for (int64_t i = 0; iter->Valid() && i <= limit - 1; ++i) {
+  if (!spec.reversed) {
+    iter->Seek(start_key);
+  } else {
+    if (spec.max_infinite) {
+      iter->SeekToLast();
+    } else {
+      iter->SeekForPrev(start_key);
+    }
+  }
+  int64_t pos = 0;
+  for (; iter->Valid() && iter->key().starts_with(prefix_key); (!spec.reversed ? iter->Next() : iter->Prev())) {
     FieldValue tmp_field_value;
     InternalKey ikey(iter->key(), storage_->IsSlotIdEncoded());
+    if (spec.reversed) {
+      if (ikey.GetSubKey().ToString() < spec.min || (spec.minex && ikey.GetSubKey().ToString() == spec.min)) {
+        break;
+      }
+      if ((spec.maxex && ikey.GetSubKey().ToString() == spec.max) ||
+          (!spec.max_infinite && ikey.GetSubKey().ToString() > spec.max)) {
+        continue;
+      }
+    } else {
+      if (spec.minex && ikey.GetSubKey().ToString() == spec.min) continue;  // the min member was exclusive
+      if ((spec.maxex && ikey.GetSubKey().ToString() == spec.max) ||
+          (!spec.max_infinite && ikey.GetSubKey().ToString() > spec.max))
+        break;
+    }
+    if (spec.offset >= 0 && pos++ < spec.offset) continue;
     tmp_field_value.field = ikey.GetSubKey().ToString();
     tmp_field_value.value = iter->value().ToString();
     field_values->emplace_back(tmp_field_value);
-    iter->Next();
+    if (spec.count > 0 && field_values && field_values->size() >= static_cast<unsigned>(spec.count)) break;
   }
   return rocksdb::Status::OK();
 }

src/types/redis_hash.h

@@ -25,6 +25,7 @@
 #include <string>
 #include <vector>
 
+#include "common/range_spec.h"
 #include "encoding.h"
 #include "storage/redis_db.h"
 #include "storage/redis_metadata.h"
@@ -48,8 +49,8 @@ class Hash : public SubKeyScanner {
   rocksdb::Status IncrBy(const Slice &user_key, const Slice &field, int64_t increment, int64_t *ret);
   rocksdb::Status IncrByFloat(const Slice &user_key, const Slice &field, double increment, double *ret);
   rocksdb::Status MSet(const Slice &user_key, const std::vector<FieldValue> &field_values, bool nx, int *ret);
-  rocksdb::Status Range(const Slice &user_key, const Slice &start, const Slice &stop, int64_t limit,
-                        std::vector<FieldValue> *field_values);
+  rocksdb::Status RangeByLex(const Slice &user_key, const CommonRangeLexSpec &spec,
+                             std::vector<FieldValue> *field_values);
   rocksdb::Status MGet(const Slice &user_key, const std::vector<Slice> &fields, std::vector<std::string> *values,
                        std::vector<rocksdb::Status> *statuses);
   rocksdb::Status GetAll(const Slice &user_key, std::vector<FieldValue> *field_values,

src/types/redis_zset.cc

@@ -414,8 +414,8 @@ rocksdb::Status ZSet::RangeByScore(const Slice &user_key, ZRangeSpec spec, std::
   return rocksdb::Status::OK();
 }
 
-rocksdb::Status ZSet::RangeByLex(const Slice &user_key, const ZRangeLexSpec &spec, std::vector<std::string> *members,
-                                 int *size) {
+rocksdb::Status ZSet::RangeByLex(const Slice &user_key, const CommonRangeLexSpec &spec,
+                                 std::vector<std::string> *members, int *size) {
   if (size) *size = 0;
   if (members) members->clear();
   if (spec.offset > -1 && spec.count == 0) {
@@ -564,7 +564,7 @@ rocksdb::Status ZSet::RemoveRangeByScore(const Slice &user_key, ZRangeSpec spec,
   return RangeByScore(user_key, spec, nullptr, ret);
 }
 
-rocksdb::Status ZSet::RemoveRangeByLex(const Slice &user_key, ZRangeLexSpec spec, int *ret) {
+rocksdb::Status ZSet::RemoveRangeByLex(const Slice &user_key, CommonRangeLexSpec spec, int *ret) {
   spec.removed = true;
   return RangeByLex(user_key, spec, nullptr, ret);
 }
@@ -799,39 +799,6 @@ Status ZSet::ParseRangeSpec(const std::string &min, const std::string &max, ZRan
   return Status::OK();
 }
 
-Status ZSet::ParseRangeLexSpec(const std::string &min, const std::string &max, ZRangeLexSpec *spec) {
-  if (min == "+" || max == "-") {
-    return Status(Status::NotOK, "min > max");
-  }
-
-  if (min == "-") {
-    spec->min = "";
-  } else {
-    if (min[0] == '(') {
-      spec->minex = true;
-    } else if (min[0] == '[') {
-      spec->minex = false;
-    } else {
-      return Status(Status::NotOK, "the min is illegal");
-    }
-    spec->min = min.substr(1);
-  }
-
-  if (max == "+") {
-    spec->max_infinite = true;
-  } else {
-    if (max[0] == '(') {
-      spec->maxex = true;
-    } else if (max[0] == '[') {
-      spec->maxex = false;
-    } else {
-      return Status(Status::NotOK, "the max is illegal");
-    }
-    spec->max = max.substr(1);
-  }
-  return Status::OK();
-}
-
 rocksdb::Status ZSet::Scan(const Slice &user_key, const std::string &cursor, uint64_t limit,
                            const std::string &member_prefix, std::vector<std::string> *members,
                            std::vector<double> *scores) {