00e78a6b6d
* Daemon: support remote configuration This: * Adds support for fetching the configuration from a remote HTTP location: `ipfs-cluster-service init http://localhost:8080/ipfs/Qm...` will instruct cluster to read the configuration file from ipfs on start (potentially making use of ipns and dnslink). This is done by creating a `service.json` like `{ "source": <url> }`. The source is then read when loading that configuration every time the daemon starts. This allows to let users always use a mutating remote configuration, potentially adding/removing trusted peers from the list or adjusting other things. * Configuration and state helpers from ipfs-cluster-service have been extracted to its own cmdutils package. This will help supporting something like an `ipfs-cluster-follow` command in the next releases. * Allows to disable the rest api by not defining it in the configuration (I thought this was already so, but apparently only affected the ipfsproxy). * Removes informer/allocator configurations from the daemon (--alloc). No one used a non default pair. In fact, it was potentially buggy to use the reposize one.
72 lines
1.6 KiB
Go
72 lines
1.6 KiB
Go
package main
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import (
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"errors"
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"fmt"
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"io"
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"path"
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fslock "github.com/ipfs/go-fs-lock"
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"github.com/ipfs/ipfs-cluster/cmdutils"
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)
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// lock logic heavily inspired by go-ipfs/repo/fsrepo/lock/lock.go
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// The name of the file used for locking
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const lockFileName = "cluster.lock"
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var locker *lock
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// lock helps to coordinate procees via a lock file
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type lock struct {
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lockCloser io.Closer
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path string
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}
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func (l *lock) lock() {
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if l.lockCloser != nil {
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checkErr("", errors.New("cannot acquire lock twice"))
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}
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// we should have a config folder whenever we try to lock
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cfgHelper := cmdutils.NewConfigHelper(configPath, identityPath)
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cfgHelper.MakeConfigFolder()
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// set the lock file within this function
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logger.Debug("checking lock")
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lk, err := fslock.Lock(l.path, lockFileName)
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if err != nil {
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logger.Debug(err)
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l.lockCloser = nil
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errStr := "%s. If no other "
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errStr += "%s process is running, remove %s, or make sure "
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errStr += "that the config folder is writable for the user "
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errStr += "running %s."
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errStr = fmt.Sprintf(
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errStr,
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err,
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programName,
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path.Join(l.path, lockFileName),
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programName,
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)
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checkErr("obtaining execution lock", errors.New(errStr))
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}
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logger.Debugf("%s execution lock acquired", programName)
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l.lockCloser = lk
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}
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func (l *lock) tryUnlock() error {
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// Noop in the uninitialized case
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if l.lockCloser == nil {
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logger.Debug("locking not initialized, unlock is noop")
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return nil
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}
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err := l.lockCloser.Close()
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if err != nil {
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return err
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}
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logger.Debug("successfully released execution lock")
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l.lockCloser = nil
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return nil
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}
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