mirror of
https://github.com/prometheus/statsd_exporter.git
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48 lines
1.7 KiB
Go
48 lines
1.7 KiB
Go
// Copyright 2018 The Prometheus 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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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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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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package fsm
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import (
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"fmt"
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"io"
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)
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// DumpFSM accepts a io.writer and write the current FSM into dot file format.
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func (f *FSM) DumpFSM(w io.Writer) {
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idx := 0
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states := make(map[int]*mappingState)
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states[idx] = f.root
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w.Write([]byte("digraph g {\n"))
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w.Write([]byte("rankdir=LR\n")) // make it vertical
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w.Write([]byte("node [ label=\"\",style=filled,fillcolor=white,shape=circle ]\n")) // remove label of node
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for idx < len(states) {
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for field, transition := range states[idx].transitions {
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states[len(states)] = transition
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w.Write([]byte(fmt.Sprintf("%d -> %d [label = \"%s\"];\n", idx, len(states)-1, field)))
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if idx == 0 {
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// color for metric types
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w.Write([]byte(fmt.Sprintf("%d [color=\"#D6B656\",fillcolor=\"#FFF2CC\"];\n", len(states)-1)))
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} else if transition.transitions == nil || len(transition.transitions) == 0 {
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// color for end state
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w.Write([]byte(fmt.Sprintf("%d [color=\"#82B366\",fillcolor=\"#D5E8D4\"];\n", len(states)-1)))
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}
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}
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idx++
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}
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// color for start state
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w.Write([]byte(fmt.Sprintf("0 [color=\"#a94442\",fillcolor=\"#f2dede\"];\n")))
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w.Write([]byte("}"))
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}
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