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Posted to reviews@yunikorn.apache.org by GitBox <gi...@apache.org> on 2022/03/15 22:56:24 UTC

[GitHub] [incubator-yunikorn-core] craigcondit opened a new pull request #386: [YUNIKORN-1120] Allow unit specifiers in core configs

craigcondit opened a new pull request #386:
URL: https://github.com/apache/incubator-yunikorn-core/pull/386


   ### What is this PR for?
   This PR updates the scheduler core to allow unit specifiers in configuration.
   
   ### What type of PR is it?
   * [ ] - Bug Fix
   * [x] - Improvement
   * [ ] - Feature
   * [ ] - Documentation
   * [ ] - Hot Fix
   * [ ] - Refactoring
   
   ### Todos
   * [ ] - Task
   
   ### What is the Jira issue?
   https://issues.apache.org/jira/browse/YUNIKORN-1120
   
   ### How should this be tested?
   Unit tests added / updated
   
   ### Screenshots (if appropriate)
   
   ### Questions:
   * [ ] - The licenses files need update.
   * [x] - There is breaking changes for older versions.
   * [x] - It needs documentation.
   


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[GitHub] [incubator-yunikorn-core] craigcondit commented on a change in pull request #386: [YUNIKORN-1120] Allow unit specifiers in core configs

Posted by GitBox <gi...@apache.org>.
craigcondit commented on a change in pull request #386:
URL: https://github.com/apache/incubator-yunikorn-core/pull/386#discussion_r828158148



##########
File path: pkg/common/resources/quantity.go
##########
@@ -0,0 +1,103 @@
+/*
+ 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.
+*/
+
+package resources
+
+import (
+	"errors"
+	"math/big"
+	"regexp"
+	"strconv"
+)
+
+// This code handles parsing of SI units in quantities:
+// <quantity>     ::= <signedNumber><suffix>
+// <signedNumber> ::= <digits> | <sign><digits>
+// <sign>         ::= "+" | "-"
+// <digit>        ::= 0 | 1 | ... | 9
+// <digits>       ::= <digit> | <digit><digits>
+// <suffix>       ::= <binarySI> | <decimalSI>
+// <binarySI>     ::= Ki | Mi | Gi | Ti | Pi | Ei
+// <decimalSI>    ::= "" | k | K | M | G | T | P | E
+// Additionally, ParseVCore supports decimalSI of 'm' to indicate millicore.
+
+var whitespace = regexp.MustCompile(`\s+`)
+var legal = regexp.MustCompile(`^(?P<Number>[+-]?[0-9]+)(?P<Suffix>[A-Za-z]*)$`)
+
+var multipliers = map[string]int64{
+	"":   1,
+	"m":  1, // special handling if milli is in use
+	"k":  1e3,
+	"M":  1e6,
+	"G":  1e9,
+	"T":  1e12,
+	"P":  1e15,
+	"E":  1e18,
+	"Ki": 1 << 10,
+	"Mi": 1 << 20,
+	"Gi": 1 << 30,
+	"Ti": 1 << 40,
+	"Pi": 1 << 50,
+	"Ei": 1 << 60,
+}
+
+// ParseQuantity is used to parse user-provided values into int64 quantities.
+func ParseQuantity(value string) (Quantity, error) {
+	return parse(value, false)
+}
+
+// ParseVCore is similar to ParseQuantity but allows the 'm' suffix. Additionally, the base unit returned is a
+// millicore, so values without units will be converted to milliCPUs (i.e. '10' will result in 10000, and '500m' will
+// result in 500).
+func ParseVCore(value string) (Quantity, error) {
+	return parse(value, true)
+}
+
+func parse(value string, milli bool) (Quantity, error) {
+	value = whitespace.ReplaceAllLiteralString(value, "")
+
+	parts := legal.FindStringSubmatch(value)
+	if parts == nil || len(parts) != 3 {
+		return 0, errors.New("invalid quantity")
+	}

Review comment:
       Done.




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[GitHub] [incubator-yunikorn-core] craigcondit commented on a change in pull request #386: [YUNIKORN-1120] Allow unit specifiers in core configs

Posted by GitBox <gi...@apache.org>.
craigcondit commented on a change in pull request #386:
URL: https://github.com/apache/incubator-yunikorn-core/pull/386#discussion_r828157623



##########
File path: pkg/common/resources/quantity.go
##########
@@ -0,0 +1,103 @@
+/*
+ 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.
+*/
+
+package resources
+
+import (
+	"errors"
+	"math/big"
+	"regexp"
+	"strconv"
+)
+
+// This code handles parsing of SI units in quantities:
+// <quantity>     ::= <signedNumber><suffix>
+// <signedNumber> ::= <digits> | <sign><digits>
+// <sign>         ::= "+" | "-"

Review comment:
       Removed negative support.




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[GitHub] [incubator-yunikorn-core] codecov[bot] commented on pull request #386: [YUNIKORN-1120] Allow unit specifiers in core configs

Posted by GitBox <gi...@apache.org>.
codecov[bot] commented on pull request #386:
URL: https://github.com/apache/incubator-yunikorn-core/pull/386#issuecomment-1068544431


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   > Merging [#386](https://codecov.io/gh/apache/incubator-yunikorn-core/pull/386?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (7b7f9c0) into [master](https://codecov.io/gh/apache/incubator-yunikorn-core/commit/2f7ee5bd43e7cd1f5bd86118be778982b42f8d01?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (2f7ee5b) will **increase** coverage by `0.10%`.
   > The diff coverage is `100.00%`.
   
   ```diff
   @@            Coverage Diff             @@
   ##           master     #386      +/-   ##
   ==========================================
   + Coverage   69.40%   69.51%   +0.10%     
   ==========================================
     Files          66       67       +1     
     Lines        9475     9515      +40     
   ==========================================
   + Hits         6576     6614      +38     
   - Misses       2655     2656       +1     
   - Partials      244      245       +1     
   ```
   
   
   | [Impacted Files](https://codecov.io/gh/apache/incubator-yunikorn-core/pull/386?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) | Coverage Δ | |
   |---|---|---|
   | [pkg/common/resources/quantity.go](https://codecov.io/gh/apache/incubator-yunikorn-core/pull/386/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGtnL2NvbW1vbi9yZXNvdXJjZXMvcXVhbnRpdHkuZ28=) | `100.00% <100.00%> (ø)` | |
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   | [pkg/events/event\_publisher.go](https://codecov.io/gh/apache/incubator-yunikorn-core/pull/386/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGtnL2V2ZW50cy9ldmVudF9wdWJsaXNoZXIuZ28=) | `92.59% <0.00%> (-7.41%)` | :arrow_down: |
   
   ------
   
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   > Powered by [Codecov](https://codecov.io/gh/apache/incubator-yunikorn-core/pull/386?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Last update [2f7ee5b...7b7f9c0](https://codecov.io/gh/apache/incubator-yunikorn-core/pull/386?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation).
   


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[GitHub] [incubator-yunikorn-core] craigcondit commented on a change in pull request #386: [YUNIKORN-1120] Allow unit specifiers in core configs

Posted by GitBox <gi...@apache.org>.
craigcondit commented on a change in pull request #386:
URL: https://github.com/apache/incubator-yunikorn-core/pull/386#discussion_r828158024



##########
File path: pkg/common/resources/quantity.go
##########
@@ -0,0 +1,103 @@
+/*
+ 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.
+*/
+
+package resources
+
+import (
+	"errors"
+	"math/big"
+	"regexp"
+	"strconv"
+)
+
+// This code handles parsing of SI units in quantities:
+// <quantity>     ::= <signedNumber><suffix>
+// <signedNumber> ::= <digits> | <sign><digits>
+// <sign>         ::= "+" | "-"
+// <digit>        ::= 0 | 1 | ... | 9
+// <digits>       ::= <digit> | <digit><digits>
+// <suffix>       ::= <binarySI> | <decimalSI>
+// <binarySI>     ::= Ki | Mi | Gi | Ti | Pi | Ei
+// <decimalSI>    ::= "" | k | K | M | G | T | P | E
+// Additionally, ParseVCore supports decimalSI of 'm' to indicate millicore.
+
+var whitespace = regexp.MustCompile(`\s+`)
+var legal = regexp.MustCompile(`^(?P<Number>[+-]?[0-9]+)(?P<Suffix>[A-Za-z]*)$`)

Review comment:
       Done.




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[GitHub] [incubator-yunikorn-core] codecov[bot] edited a comment on pull request #386: [YUNIKORN-1120] Allow unit specifiers in core configs

Posted by GitBox <gi...@apache.org>.
codecov[bot] edited a comment on pull request #386:
URL: https://github.com/apache/incubator-yunikorn-core/pull/386#issuecomment-1068544431


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   > Merging [#386](https://codecov.io/gh/apache/incubator-yunikorn-core/pull/386?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (5a160f5) into [master](https://codecov.io/gh/apache/incubator-yunikorn-core/commit/2f7ee5bd43e7cd1f5bd86118be778982b42f8d01?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (2f7ee5b) will **increase** coverage by `0.09%`.
   > The diff coverage is `100.00%`.
   
   ```diff
   @@            Coverage Diff             @@
   ##           master     #386      +/-   ##
   ==========================================
   + Coverage   69.40%   69.50%   +0.09%     
   ==========================================
     Files          66       67       +1     
     Lines        9475     9515      +40     
   ==========================================
   + Hits         6576     6613      +37     
   - Misses       2655     2657       +2     
   - Partials      244      245       +1     
   ```
   
   
   | [Impacted Files](https://codecov.io/gh/apache/incubator-yunikorn-core/pull/386?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) | Coverage Δ | |
   |---|---|---|
   | [pkg/common/resources/quantity.go](https://codecov.io/gh/apache/incubator-yunikorn-core/pull/386/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGtnL2NvbW1vbi9yZXNvdXJjZXMvcXVhbnRpdHkuZ28=) | `100.00% <100.00%> (ø)` | |
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   > `Δ = absolute <relative> (impact)`, `ø = not affected`, `? = missing data`
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[GitHub] [incubator-yunikorn-core] craigcondit closed pull request #386: [YUNIKORN-1120] Allow unit specifiers in core configs

Posted by GitBox <gi...@apache.org>.
craigcondit closed pull request #386:
URL: https://github.com/apache/incubator-yunikorn-core/pull/386


   


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[GitHub] [incubator-yunikorn-core] craigcondit closed pull request #386: [YUNIKORN-1120] Allow unit specifiers in core configs

Posted by GitBox <gi...@apache.org>.
craigcondit closed pull request #386:
URL: https://github.com/apache/incubator-yunikorn-core/pull/386


   


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[GitHub] [incubator-yunikorn-core] craigcondit commented on a change in pull request #386: [YUNIKORN-1120] Allow unit specifiers in core configs

Posted by GitBox <gi...@apache.org>.
craigcondit commented on a change in pull request #386:
URL: https://github.com/apache/incubator-yunikorn-core/pull/386#discussion_r828157864



##########
File path: pkg/common/resources/quantity.go
##########
@@ -0,0 +1,103 @@
+/*
+ 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.
+*/
+
+package resources
+
+import (
+	"errors"
+	"math/big"
+	"regexp"
+	"strconv"
+)
+
+// This code handles parsing of SI units in quantities:
+// <quantity>     ::= <signedNumber><suffix>
+// <signedNumber> ::= <digits> | <sign><digits>
+// <sign>         ::= "+" | "-"
+// <digit>        ::= 0 | 1 | ... | 9
+// <digits>       ::= <digit> | <digit><digits>
+// <suffix>       ::= <binarySI> | <decimalSI>
+// <binarySI>     ::= Ki | Mi | Gi | Ti | Pi | Ei
+// <decimalSI>    ::= "" | k | K | M | G | T | P | E
+// Additionally, ParseVCore supports decimalSI of 'm' to indicate millicore.
+
+var whitespace = regexp.MustCompile(`\s+`)

Review comment:
       Done.




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[GitHub] [incubator-yunikorn-core] wilfred-s commented on a change in pull request #386: [YUNIKORN-1120] Allow unit specifiers in core configs

Posted by GitBox <gi...@apache.org>.
wilfred-s commented on a change in pull request #386:
URL: https://github.com/apache/incubator-yunikorn-core/pull/386#discussion_r827530584



##########
File path: pkg/common/resources/quantity.go
##########
@@ -0,0 +1,103 @@
+/*
+ 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.
+*/
+
+package resources
+
+import (
+	"errors"
+	"math/big"
+	"regexp"
+	"strconv"
+)
+
+// This code handles parsing of SI units in quantities:
+// <quantity>     ::= <signedNumber><suffix>
+// <signedNumber> ::= <digits> | <sign><digits>
+// <sign>         ::= "+" | "-"
+// <digit>        ::= 0 | 1 | ... | 9
+// <digits>       ::= <digit> | <digit><digits>
+// <suffix>       ::= <binarySI> | <decimalSI>
+// <binarySI>     ::= Ki | Mi | Gi | Ti | Pi | Ei
+// <decimalSI>    ::= "" | k | K | M | G | T | P | E
+// Additionally, ParseVCore supports decimalSI of 'm' to indicate millicore.
+
+var whitespace = regexp.MustCompile(`\s+`)

Review comment:
       Use a `strings.TrimSpace()` instead of a regexp. We do not want to allow "1 000 000" as a value which we do with the current setup. If we allow spaces between value and suffix we need to add it in the regexp as below.

##########
File path: pkg/common/resources/quantity.go
##########
@@ -0,0 +1,103 @@
+/*
+ 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.
+*/
+
+package resources
+
+import (
+	"errors"
+	"math/big"
+	"regexp"
+	"strconv"
+)
+
+// This code handles parsing of SI units in quantities:
+// <quantity>     ::= <signedNumber><suffix>
+// <signedNumber> ::= <digits> | <sign><digits>
+// <sign>         ::= "+" | "-"

Review comment:
       In the config(s) we do not allow negative values. I don't think we should allow that here.

##########
File path: pkg/common/resources/quantity.go
##########
@@ -0,0 +1,103 @@
+/*
+ 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.
+*/
+
+package resources
+
+import (
+	"errors"
+	"math/big"
+	"regexp"
+	"strconv"
+)
+
+// This code handles parsing of SI units in quantities:
+// <quantity>     ::= <signedNumber><suffix>
+// <signedNumber> ::= <digits> | <sign><digits>
+// <sign>         ::= "+" | "-"
+// <digit>        ::= 0 | 1 | ... | 9
+// <digits>       ::= <digit> | <digit><digits>
+// <suffix>       ::= <binarySI> | <decimalSI>
+// <binarySI>     ::= Ki | Mi | Gi | Ti | Pi | Ei
+// <decimalSI>    ::= "" | k | K | M | G | T | P | E
+// Additionally, ParseVCore supports decimalSI of 'm' to indicate millicore.
+
+var whitespace = regexp.MustCompile(`\s+`)
+var legal = regexp.MustCompile(`^(?P<Number>[+-]?[0-9]+)(?P<Suffix>[A-Za-z]*)$`)

Review comment:
       Narrow the regexp for the parts further:
   ```
   var legal = regexp.MustCompile(`^(?P<Number>[+-]?[0-9]+)\s*(?P<Suffix>[[mkKMGTPE]i?]*)$`)
   ```
   That complies better to the described suffixes. The only extra suffixes that are not filtered out are K, ki and mi

##########
File path: pkg/common/resources/quantity.go
##########
@@ -0,0 +1,103 @@
+/*
+ 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.
+*/
+
+package resources
+
+import (
+	"errors"
+	"math/big"
+	"regexp"
+	"strconv"
+)
+
+// This code handles parsing of SI units in quantities:
+// <quantity>     ::= <signedNumber><suffix>
+// <signedNumber> ::= <digits> | <sign><digits>
+// <sign>         ::= "+" | "-"
+// <digit>        ::= 0 | 1 | ... | 9
+// <digits>       ::= <digit> | <digit><digits>
+// <suffix>       ::= <binarySI> | <decimalSI>
+// <binarySI>     ::= Ki | Mi | Gi | Ti | Pi | Ei
+// <decimalSI>    ::= "" | k | K | M | G | T | P | E
+// Additionally, ParseVCore supports decimalSI of 'm' to indicate millicore.
+
+var whitespace = regexp.MustCompile(`\s+`)
+var legal = regexp.MustCompile(`^(?P<Number>[+-]?[0-9]+)(?P<Suffix>[A-Za-z]*)$`)
+
+var multipliers = map[string]int64{
+	"":   1,
+	"m":  1, // special handling if milli is in use
+	"k":  1e3,
+	"M":  1e6,
+	"G":  1e9,
+	"T":  1e12,
+	"P":  1e15,
+	"E":  1e18,
+	"Ki": 1 << 10,
+	"Mi": 1 << 20,
+	"Gi": 1 << 30,
+	"Ti": 1 << 40,
+	"Pi": 1 << 50,
+	"Ei": 1 << 60,
+}
+
+// ParseQuantity is used to parse user-provided values into int64 quantities.
+func ParseQuantity(value string) (Quantity, error) {
+	return parse(value, false)
+}
+
+// ParseVCore is similar to ParseQuantity but allows the 'm' suffix. Additionally, the base unit returned is a
+// millicore, so values without units will be converted to milliCPUs (i.e. '10' will result in 10000, and '500m' will
+// result in 500).
+func ParseVCore(value string) (Quantity, error) {
+	return parse(value, true)
+}
+
+func parse(value string, milli bool) (Quantity, error) {
+	value = whitespace.ReplaceAllLiteralString(value, "")
+
+	parts := legal.FindStringSubmatch(value)
+	if parts == nil || len(parts) != 3 {
+		return 0, errors.New("invalid quantity")
+	}

Review comment:
       FindStringSubmatch returns nil if it does not match. In all other cases it returns a fixed slice of 3 parts.
   Simplify to `len(parts) == 0`




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