github.com/bazelbuild/bazel-watcher@v0.25.2/internal/ibazel/lifecycle_hooks/lifecycle_hooks.go (about)

     1  // Copyright 2018 The Bazel Authors. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //    http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  // Implements lifecycle hooks for each command execution iteration.
    16  
    17  package lifecycle_hooks
    18  
    19  import (
    20  	"bytes"
    21  	"flag"
    22  
    23  	"github.com/bazelbuild/bazel-watcher/internal/ibazel/log"
    24  	"github.com/bazelbuild/bazel-watcher/internal/ibazel/workspace"
    25  	"github.com/bazelbuild/bazel-watcher/third_party/bazel/master/src/main/protobuf/blaze_query"
    26  	"github.com/mattn/go-shellwords"
    27  )
    28  
    29  var (
    30  	runCommandBefore       = flag.String("run_command_before", "", "A command to run before each execution")
    31  	runCommandAfter        = flag.String("run_command_after", "", "A command to run after each execution")
    32  	runCommandAfterSuccess = flag.String("run_command_after_success", "", "A command to run after each successful execution")
    33  	runCommandAfterError   = flag.String("run_command_after_error", "", "A command to run after each failed execution")
    34  )
    35  
    36  type LifecycleHooks struct {
    37  	w workspace.Workspace
    38  }
    39  
    40  func New() *LifecycleHooks {
    41  	return &LifecycleHooks{
    42  		w: &workspace.MainWorkspace{},
    43  	}
    44  }
    45  
    46  func (l *LifecycleHooks) Initialize(info *map[string]string) {}
    47  
    48  func (l *LifecycleHooks) TargetDecider(rule *blaze_query.Rule) {}
    49  
    50  func (l *LifecycleHooks) ChangeDetected(targets []string, changeType string, change string) {}
    51  
    52  func (l *LifecycleHooks) Cleanup() {}
    53  
    54  func (l *LifecycleHooks) BeforeCommand(targets []string, command string) {
    55  	l.parseAndExecuteCommand(*runCommandBefore)
    56  }
    57  
    58  func (l *LifecycleHooks) AfterCommand(targets []string, command string, success bool, output *bytes.Buffer) {
    59  	l.parseAndExecuteCommand(*runCommandAfter)
    60  	if success {
    61  		l.parseAndExecuteCommand(*runCommandAfterSuccess)
    62  	} else {
    63  		l.parseAndExecuteCommand(*runCommandAfterError)
    64  	}
    65  }
    66  
    67  func (l *LifecycleHooks) parseAndExecuteCommand(commandToRun string) {
    68  	if commandToRun != "" {
    69  		commandAndArgs, err := shellwords.Parse(commandToRun)
    70  
    71  		if err != nil {
    72  			log.Fatalf("Fail to run command `%s`: %v", commandToRun, err)
    73  		}
    74  
    75  		l.w.ExecuteCommand(commandAndArgs[0], commandAndArgs[1:])
    76  	}
    77  }