From 771ed838c62e70dd59a49c310bb851b05ab25ee4 Mon Sep 17 00:00:00 2001 From: Blallo Date: Tue, 14 Mar 2023 18:38:56 +0100 Subject: [PATCH] Implement Runnable for docker containers --- cmd/broadcast/main.go | 13 ++- docker.go | 208 ++++++++++++++++++++++++++++++++++++++++++ go.mod | 17 ++++ go.sum | 53 +++++++++++ 4 files changed, 290 insertions(+), 1 deletion(-) create mode 100644 docker.go diff --git a/cmd/broadcast/main.go b/cmd/broadcast/main.go index f8cee5e..0546c77 100644 --- a/cmd/broadcast/main.go +++ b/cmd/broadcast/main.go @@ -26,6 +26,7 @@ var ( tlsKey = flag.String("tls-key", "", "Path to key file for TLS connection") systemd = flag.Bool("systemd", false, "Interpret as systemd unit") user = flag.Bool("systemd-as-user", false, "Connect to systemd via DBus as current user") + docker = flag.Bool("docker", false, "Interpret as a docker container") ) func main() { @@ -44,6 +45,14 @@ func main() { logger.SetLevel(logz.LogDebug) } + if *docker && *systemd { + logger.Err(map[string]any{ + "msg": "Incompatible flags", + "err": "You may set `-docker` or `-systemd`", + }) + os.Exit(1) + } + runnableName := flag.Arg(0) var runnable broadcast.Runnable @@ -51,6 +60,8 @@ func main() { if *systemd { runnable = broadcast.NewSystemdUnit(logger, runnableName, *user) + } else if *docker { + runnable = broadcast.NewDockerContainer(logger, runnableName) } else { cmdLine := flag.Args()[1:] runnable, err = broadcast.NewProcess(logger, runnableName, cmdLine...) @@ -189,7 +200,7 @@ func main() { } func withTimeout[T any](ctx context.Context, respCh <-chan T) (zero T, err error) { - shortCtx, cancel := context.WithTimeout(ctx, 5*time.Second) + shortCtx, cancel := context.WithTimeout(ctx, 15*time.Second) defer cancel() select { diff --git a/docker.go b/docker.go new file mode 100644 index 0000000..a60fbcf --- /dev/null +++ b/docker.go @@ -0,0 +1,208 @@ +package broadcast + +import ( + "bufio" + "context" + "errors" + "io" + "strconv" + + "github.com/docker/docker/api/types" + "github.com/docker/docker/api/types/container" + "github.com/docker/docker/api/types/filters" + "github.com/docker/docker/client" + "github.com/docker/docker/pkg/stdcopy" + + "git.sr.ht/~blallo/logz/interface" +) + +var ( + ErrNotFound = errors.New("container not found") + ErrTooMany = errors.New("too many containers match the name") +) + +var _ Runnable = &DockerContainer{} + +type DockerContainer struct { + name string + client *client.Client + logger logz.Logger +} + +func NewDockerContainer(logger logz.Logger, name string) *DockerContainer { + return &DockerContainer{ + name: name, + logger: logger, + } +} + +func (d *DockerContainer) Init(ctx context.Context) error { + cli, err := client.NewClientWithOpts(client.FromEnv) + if err != nil { + return err + } + + d.client = cli + + return nil +} + +func (d *DockerContainer) Start(ctx context.Context) error { + c, err := d.getContainer(ctx) + if err != nil { + d.logger.Err(map[string]any{ + "msg": "Cannot find container", + "err": err.Error(), + }) + return ErrNotRunning + } + + if err = d.client.ContainerStart(ctx, c.ID, types.ContainerStartOptions{}); err != nil { + d.logger.Err(map[string]any{ + "msg": "Cannot start container", + "err": err.Error(), + }) + return ErrNotRunning + } + + return nil +} + +func (d *DockerContainer) Stop(ctx context.Context) error { + c, err := d.getContainer(ctx) + if err != nil { + d.logger.Err(map[string]any{ + "msg": "Cannot find container", + "err": err.Error(), + }) + return ErrNotRunning + } + + if err = d.client.ContainerStop(ctx, c.ID, container.StopOptions{}); err != nil { + d.logger.Err(map[string]any{ + "msg": "Cannot stop container", + "err": err.Error(), + }) + return ErrCannotStop + } + + return nil +} + +func (d *DockerContainer) Logs(ctx context.Context) []string { + c, err := d.getContainer(ctx) + if err != nil { + d.logger.Err(map[string]any{ + "msg": "Cannot find container", + "err": err.Error(), + }) + return nil + } + + conf, err := d.client.ContainerInspect(ctx, c.ID) + if err != nil { + d.logger.Err(map[string]any{ + "msg": "Cannot inspect container", + "err": err.Error(), + }) + return nil + } + + reader, err := d.client.ContainerLogs(ctx, c.ID, types.ContainerLogsOptions{ + ShowStdout: true, + ShowStderr: true, + Tail: strconv.Itoa(bufLines), + }) + if err != nil { + d.logger.Err(map[string]any{ + "msg": "Cannot stop container", + "err": err.Error(), + }) + return nil + } + + if !conf.Config.Tty { + return d.consumeStreams(reader) + } + + return d.consumeStream(reader) +} + +func (d *DockerContainer) Liveness(ctx context.Context) error { + c, err := d.getContainer(ctx) + if err != nil { + d.logger.Err(map[string]any{ + "msg": "Cannot find container", + "err": err.Error(), + }) + return ErrNotRunning + } + + if c.State != "running" { + d.logger.Debug(map[string]any{ + "msg": "Container not running", + "state": c.State, + }) + return ErrNotRunning + } + + return nil +} + +func (d *DockerContainer) getContainer(ctx context.Context) (*types.Container, error) { + containers, err := d.client.ContainerList(ctx, types.ContainerListOptions{ + Filters: filters.NewArgs(filters.KeyValuePair{Key: "name", Value: d.name}), + }) + if err != nil { + return nil, err + } + + d.logger.Debug(map[string]any{ + "msg": "Containers found", + "containers": containers, + }) + + switch len(containers) { + case 0: + return nil, ErrNotFound + case 1: + return &containers[0], nil + default: + return nil, ErrTooMany + } +} + +func (d *DockerContainer) consumeStream(r io.Reader) (result []string) { + scanner := bufio.NewScanner(r) + + for scanner.Scan() { + if err := scanner.Err(); err != nil { + d.logger.Err(map[string]any{ + "msg": "Failed to consume stream", + "err": err.Error(), + }) + return nil + } + result = append(result, scanner.Text()) + } + + return +} + +func (d *DockerContainer) consumeStreams(r io.Reader) (result []string) { + rout, wout := io.Pipe() + rerr, werr := io.Pipe() + + if _, err := stdcopy.StdCopy(wout, werr, r); err != nil { + d.logger.Err(map[string]any{ + "msg": "Failed to consume stream", + "err": err.Error(), + }) + return nil + } + + result = append(result, d.consumeStream(rout)...) + result = append(result, d.consumeStream(rerr)...) + + return +} diff --git a/go.mod b/go.mod index 31f9742..d4cf0a7 100644 --- a/go.mod +++ b/go.mod @@ -8,15 +8,32 @@ require ( git.sr.ht/~blallo/logz/zlog v0.0.0-20220324191132-95d94ae8e337 github.com/cenkalti/backoff/v4 v4.2.0 github.com/coreos/go-systemd/v22 v22.5.0 + github.com/docker/docker v23.0.1+incompatible github.com/go-chi/chi/v5 v5.0.8 github.com/gorilla/websocket v1.5.0 github.com/stretchr/testify v1.8.1 ) require ( + github.com/Microsoft/go-winio v0.6.0 // indirect github.com/davecgh/go-spew v1.1.1 // indirect + github.com/docker/distribution v2.8.1+incompatible // indirect + github.com/docker/go-connections v0.4.0 // indirect + github.com/docker/go-units v0.5.0 // indirect github.com/godbus/dbus/v5 v5.0.4 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/moby/term v0.0.0-20221205130635-1aeaba878587 // indirect + github.com/morikuni/aec v1.0.0 // indirect + github.com/opencontainers/go-digest v1.0.0 // indirect + github.com/opencontainers/image-spec v1.0.2 // indirect + github.com/pkg/errors v0.9.1 // indirect github.com/pmezard/go-difflib v1.0.0 // indirect github.com/rs/zerolog v1.26.1 // indirect + golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect + golang.org/x/net v0.0.0-20220722155237-a158d28d115b // indirect + golang.org/x/sys v0.1.0 // indirect + golang.org/x/time v0.3.0 // indirect + golang.org/x/tools v0.1.12 // indirect gopkg.in/yaml.v3 v3.0.1 // indirect + gotest.tools/v3 v3.4.0 // indirect ) diff --git a/go.sum b/go.sum index c93b060..d9cb9d6 100644 --- a/go.sum +++ b/go.sum @@ -4,6 +4,9 @@ git.sr.ht/~blallo/logz/testlogger v0.0.0-20230212191205-53d5ce2c0d54 h1:CHxlq5zr git.sr.ht/~blallo/logz/testlogger v0.0.0-20230212191205-53d5ce2c0d54/go.mod h1:qOrf0RE20YqvShbkT+uZ1YfTOp8DYVIldF2Q9umhpOo= git.sr.ht/~blallo/logz/zlog v0.0.0-20220324191132-95d94ae8e337 h1:4oSLCsOXU0sRwEwn5+VIQQ0E2YhUFrnNuZkv+umipo0= git.sr.ht/~blallo/logz/zlog v0.0.0-20220324191132-95d94ae8e337/go.mod h1:9fUP8ioBX7rzNIBYPvi7irK/ZSug4gLDInl0CJvHgys= +github.com/Azure/go-ansiterm v0.0.0-20210617225240-d185dfc1b5a1 h1:UQHMgLO+TxOElx5B5HZ4hJQsoJ/PvUvKRhJHDQXO8P8= +github.com/Microsoft/go-winio v0.6.0 h1:slsWYD/zyx7lCXoZVlvQrj0hPTM1HI4+v1sIda2yDvg= +github.com/Microsoft/go-winio v0.6.0/go.mod h1:cTAf44im0RAYeL23bpB+fzCyDH2MJiz2BO69KH/soAE= github.com/cenkalti/backoff/v4 v4.2.0 h1:HN5dHm3WBOgndBH6E8V0q2jIYIR3s9yglV8k/+MN3u4= github.com/cenkalti/backoff/v4 v4.2.0/go.mod h1:Y3VNntkOUPxTVeUxJ/G5vcM//AlwfmyYozVcomhLiZE= github.com/coreos/go-systemd/v22 v22.3.2/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSVTIJ3seZv2GcEnc= @@ -12,12 +15,35 @@ github.com/coreos/go-systemd/v22 v22.5.0/go.mod h1:Y58oyj3AT4RCenI/lSvhwexgC+NSV github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/docker/distribution v2.8.1+incompatible h1:Q50tZOPR6T/hjNsyc9g8/syEs6bk8XXApsHjKukMl68= +github.com/docker/distribution v2.8.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w= +github.com/docker/docker v23.0.1+incompatible h1:vjgvJZxprTTE1A37nm+CLNAdwu6xZekyoiVlUZEINcY= +github.com/docker/docker v23.0.1+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk= +github.com/docker/go-connections v0.4.0 h1:El9xVISelRB7BuFusrZozjnkIM5YnzCViNKohAFqRJQ= +github.com/docker/go-connections v0.4.0/go.mod h1:Gbd7IOopHjR8Iph03tsViu4nIes5XhDvyHbTtUxmeec= +github.com/docker/go-units v0.5.0 h1:69rxXcBk27SvSaaxTtLh/8llcHD8vYHT7WSdRZ/jvr4= +github.com/docker/go-units v0.5.0/go.mod h1:fgPhTUdO+D/Jk86RDLlptpiXQzgHJF7gydDDbaIK4Dk= github.com/go-chi/chi/v5 v5.0.8 h1:lD+NLqFcAi1ovnVZpsnObHGW4xb4J8lNmoYVfECH1Y0= github.com/go-chi/chi/v5 v5.0.8/go.mod h1:DslCQbL2OYiznFReuXYUmQ2hGd1aDpCnlMNITLSKoi8= github.com/godbus/dbus/v5 v5.0.4 h1:9349emZab16e7zQvpmsbtjc18ykshndd8y2PG3sgJbA= github.com/godbus/dbus/v5 v5.0.4/go.mod h1:xhWf0FNVPg57R7Z0UbKHbJfkEywrmjJnf7w5xrFpKfA= +github.com/gogo/protobuf v1.3.2 h1:Ov1cvc58UF3b5XjBnZv7+opcTcQFZebYjWzi34vdm4Q= +github.com/gogo/protobuf v1.3.2/go.mod h1:P1XiOD3dCwIKUDQYPy72D8LYyHL2YPYrpS2s69NZV8Q= +github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU= +github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE= github.com/gorilla/websocket v1.5.0 h1:PPwGk2jz7EePpoHN/+ClbZu8SPxiqlu12wZP/3sWmnc= github.com/gorilla/websocket v1.5.0/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE= +github.com/kisielk/errcheck v1.5.0/go.mod h1:pFxgyoBC7bSaBwPgfKdkLd5X25qrDl4LWUI2bnpBCr8= +github.com/kisielk/gotool v1.0.0/go.mod h1:XhKaO+MFFWcvkIS/tQcRk01m1F5IRFswLeQ+oQHNcck= +github.com/moby/term v0.0.0-20221205130635-1aeaba878587 h1:HfkjXDfhgVaN5rmueG8cL8KKeFNecRCXFhaJ2qZ5SKA= +github.com/moby/term v0.0.0-20221205130635-1aeaba878587/go.mod h1:8FzsFHVUBGZdbDsJw/ot+X+d5HLUbvklYLJ9uGfcI3Y= +github.com/morikuni/aec v1.0.0 h1:nP9CBfwrvYnBRgY6qfDQkygYDmYwOilePFkwzv4dU8A= +github.com/morikuni/aec v1.0.0/go.mod h1:BbKIizmSmc5MMPqRYbxO4ZU0S0+P200+tUnFx7PXmsc= +github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8Oi/yOhh5U= +github.com/opencontainers/go-digest v1.0.0/go.mod h1:0JzlMkj0TRzQZfJkVvzbP0HBR3IKzErnv2BNG4W4MAM= +github.com/opencontainers/image-spec v1.0.2 h1:9yCKha/T5XdGtO0q9Q9a6T5NUCsTn/DrBg0D7ufOcFM= +github.com/opencontainers/image-spec v1.0.2/go.mod h1:BtxoFyWECRxE4U/7sNtV5W15zMzWCbyJoFRP3s7yZA0= +github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4= github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0= github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= @@ -31,34 +57,61 @@ github.com/stretchr/testify v1.7.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/ github.com/stretchr/testify v1.8.0/go.mod h1:yNjHg4UonilssWZ8iaSj1OCr/vHnekPRkoO+kdMU+MU= github.com/stretchr/testify v1.8.1 h1:w7B6lhMri9wdJUVmEZPGGhZzrYTPvgJArz7wNPgYKsk= github.com/stretchr/testify v1.8.1/go.mod h1:w2LPCIKwWwSfY2zedu0+kehJoqGctiVI29o6fzry7u4= +github.com/yuin/goldmark v1.1.27/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= +github.com/yuin/goldmark v1.2.1/go.mod h1:3hX8gzYuyVAZsxl0MRgGTJEmQBFcNTphYh9decYSb74= github.com/yuin/goldmark v1.4.0/go.mod h1:mwnBkeHKe2W/ZEtQ+71ViKU8L12m81fl3OWwC1Zlc8k= golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI= +golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto= golang.org/x/crypto v0.0.0-20211215165025-cf75a172585e/go.mod h1:P+XmwS30IXTQdn5tA2iutPOUgjI07+tq3H3K9MVA1s8= +golang.org/x/mod v0.2.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA= +golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA= golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA= +golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 h1:6zppjxzCulZykYSLyVDYbneBfbaBIQPYMevg0bEwv2s= +golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4= golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg= golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 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