108 lines
3.0 KiB
Go
108 lines
3.0 KiB
Go
/*
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Copyright 2022 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"fmt"
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"io"
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"sort"
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)
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const fileHeader = `/*
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Copyright The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// File generated by ranges2go DO NOT EDIT
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package cloudcidrs
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import (
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"net/netip"
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)
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const AWS = "AWS"
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// regionToRanges contains a preparsed map of AWS regions to netip.Prefix
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var regionToRanges = map[IPInfo][]netip.Prefix{
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`
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func generateRangesGo(w io.Writer, rtp regionsToPrefixes) error {
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// generate source file
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if _, err := io.WriteString(w, fileHeader); err != nil {
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return err
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}
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// ensure iteration order is predictable
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regions := make([]string, 0, len(rtp))
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for region := range rtp {
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regions = append(regions, region)
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}
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sort.Strings(regions)
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for _, region := range regions {
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prefixes := rtp[region]
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if _, err := fmt.Fprintf(w, "\t{Cloud: AWS, Region: %q}: {\n", region); err != nil {
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return err
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}
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for _, prefix := range prefixes {
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addr := prefix.Addr()
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bits := prefix.Bits()
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// Using netip.*From avoids additional runtime allocation.
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//
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// It also means we don't need error checking / parsing cannot fail
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// at runtime, we've already parsed these and re-emitted them
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// as pre-computed IP address / bit mask values.
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if addr.Is4() {
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b := addr.As4()
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if _, err := fmt.Fprintf(w,
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"\t\tnetip.PrefixFrom(netip.AddrFrom4([4]byte{%d, %d, %d, %d}), %d),\n",
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b[0], b[1], b[2], b[3], bits,
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); err != nil {
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return err
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}
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} else {
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b := addr.As16()
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if _, err := fmt.Fprintf(w,
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"\t\tnetip.PrefixFrom(netip.AddrFrom16([16]byte{%d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d, %d}), %d),\n",
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b[0], b[1], b[2], b[3], b[4], b[5], b[6], b[7], b[8], b[9], b[10], b[11], b[12], b[13], b[14], b[15], bits,
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); err != nil {
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return err
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}
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}
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}
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if _, err := io.WriteString(w, "\t},\n"); err != nil {
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return err
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}
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}
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if _, err := io.WriteString(w, "}\n"); err != nil {
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return err
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}
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return nil
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}
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