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workspaceagents.go
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/
workspaceagents.go
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package coderd
import (
"database/sql"
"encoding/json"
"fmt"
"io"
"net"
"net/http"
"strconv"
"time"
"github.com/hashicorp/yamux"
"golang.org/x/xerrors"
"nhooyr.io/websocket"
"cdr.dev/slog"
"github.com/coder/coder/agent"
"github.com/coder/coder/coderd/database"
"github.com/coder/coder/coderd/httpapi"
"github.com/coder/coder/coderd/httpmw"
"github.com/coder/coder/codersdk"
"github.com/coder/coder/peerbroker"
"github.com/coder/coder/peerbroker/proto"
"github.com/coder/coder/provisionersdk"
)
func (api *api) workspaceAgent(rw http.ResponseWriter, r *http.Request) {
workspaceAgent := httpmw.WorkspaceAgentParam(r)
apiAgent, err := convertWorkspaceAgent(workspaceAgent, api.AgentConnectionUpdateFrequency)
if err != nil {
httpapi.Write(rw, http.StatusInternalServerError, httpapi.Response{
Message: fmt.Sprintf("convert workspace agent: %s", err),
})
return
}
httpapi.Write(rw, http.StatusOK, apiAgent)
}
func (api *api) workspaceAgentDial(rw http.ResponseWriter, r *http.Request) {
api.websocketWaitMutex.Lock()
api.websocketWaitGroup.Add(1)
api.websocketWaitMutex.Unlock()
defer api.websocketWaitGroup.Done()
workspaceAgent := httpmw.WorkspaceAgentParam(r)
apiAgent, err := convertWorkspaceAgent(workspaceAgent, api.AgentConnectionUpdateFrequency)
if err != nil {
httpapi.Write(rw, http.StatusInternalServerError, httpapi.Response{
Message: fmt.Sprintf("convert workspace agent: %s", err),
})
return
}
if apiAgent.Status != codersdk.WorkspaceAgentConnected {
httpapi.Write(rw, http.StatusPreconditionFailed, httpapi.Response{
Message: fmt.Sprintf("Agent isn't connected! Status: %s", apiAgent.Status),
})
return
}
conn, err := websocket.Accept(rw, r, &websocket.AcceptOptions{
CompressionMode: websocket.CompressionDisabled,
})
if err != nil {
httpapi.Write(rw, http.StatusBadRequest, httpapi.Response{
Message: fmt.Sprintf("accept websocket: %s", err),
})
return
}
defer func() {
_ = conn.Close(websocket.StatusNormalClosure, "")
}()
config := yamux.DefaultConfig()
config.LogOutput = io.Discard
session, err := yamux.Server(websocket.NetConn(r.Context(), conn, websocket.MessageBinary), config)
if err != nil {
_ = conn.Close(websocket.StatusAbnormalClosure, err.Error())
return
}
err = peerbroker.ProxyListen(r.Context(), session, peerbroker.ProxyOptions{
ChannelID: workspaceAgent.ID.String(),
Logger: api.Logger.Named("peerbroker-proxy-dial"),
Pubsub: api.Pubsub,
})
if err != nil {
_ = conn.Close(websocket.StatusInternalError, httpapi.WebsocketCloseSprintf("serve: %s", err))
return
}
}
func (api *api) workspaceAgentMetadata(rw http.ResponseWriter, r *http.Request) {
workspaceAgent := httpmw.WorkspaceAgent(r)
apiAgent, err := convertWorkspaceAgent(workspaceAgent, api.AgentConnectionUpdateFrequency)
if err != nil {
httpapi.Write(rw, http.StatusInternalServerError, httpapi.Response{
Message: fmt.Sprintf("convert workspace agent: %s", err),
})
return
}
resource, err := api.Database.GetWorkspaceResourceByID(r.Context(), workspaceAgent.ResourceID)
if err != nil {
httpapi.Write(rw, http.StatusInternalServerError, httpapi.Response{
Message: fmt.Sprintf("get workspace resource: %s", err),
})
return
}
build, err := api.Database.GetWorkspaceBuildByJobID(r.Context(), resource.JobID)
if err != nil {
httpapi.Write(rw, http.StatusInternalServerError, httpapi.Response{
Message: fmt.Sprintf("get workspace build: %s", err),
})
return
}
workspace, err := api.Database.GetWorkspaceByID(r.Context(), build.WorkspaceID)
if err != nil {
httpapi.Write(rw, http.StatusInternalServerError, httpapi.Response{
Message: fmt.Sprintf("get workspace build: %s", err),
})
return
}
owner, err := api.Database.GetUserByID(r.Context(), workspace.OwnerID)
if err != nil {
httpapi.Write(rw, http.StatusInternalServerError, httpapi.Response{
Message: fmt.Sprintf("get workspace build: %s", err),
})
return
}
httpapi.Write(rw, http.StatusOK, agent.Metadata{
OwnerEmail: owner.Email,
OwnerUsername: owner.Username,
EnvironmentVariables: apiAgent.EnvironmentVariables,
StartupScript: apiAgent.StartupScript,
})
}
func (api *api) workspaceAgentListen(rw http.ResponseWriter, r *http.Request) {
api.websocketWaitMutex.Lock()
api.websocketWaitGroup.Add(1)
api.websocketWaitMutex.Unlock()
defer api.websocketWaitGroup.Done()
workspaceAgent := httpmw.WorkspaceAgent(r)
conn, err := websocket.Accept(rw, r, &websocket.AcceptOptions{
CompressionMode: websocket.CompressionDisabled,
})
if err != nil {
httpapi.Write(rw, http.StatusBadRequest, httpapi.Response{
Message: fmt.Sprintf("accept websocket: %s", err),
})
return
}
resource, err := api.Database.GetWorkspaceResourceByID(r.Context(), workspaceAgent.ResourceID)
if err != nil {
httpapi.Write(rw, http.StatusBadRequest, httpapi.Response{
Message: fmt.Sprintf("accept websocket: %s", err),
})
return
}
defer func() {
_ = conn.Close(websocket.StatusNormalClosure, "")
}()
config := yamux.DefaultConfig()
config.LogOutput = io.Discard
session, err := yamux.Server(websocket.NetConn(r.Context(), conn, websocket.MessageBinary), config)
if err != nil {
_ = conn.Close(websocket.StatusAbnormalClosure, err.Error())
return
}
closer, err := peerbroker.ProxyDial(proto.NewDRPCPeerBrokerClient(provisionersdk.Conn(session)), peerbroker.ProxyOptions{
ChannelID: workspaceAgent.ID.String(),
Pubsub: api.Pubsub,
Logger: api.Logger.Named("peerbroker-proxy-listen"),
})
if err != nil {
_ = conn.Close(websocket.StatusAbnormalClosure, err.Error())
return
}
defer closer.Close()
firstConnectedAt := workspaceAgent.FirstConnectedAt
if !firstConnectedAt.Valid {
firstConnectedAt = sql.NullTime{
Time: database.Now(),
Valid: true,
}
}
lastConnectedAt := sql.NullTime{
Time: database.Now(),
Valid: true,
}
disconnectedAt := workspaceAgent.DisconnectedAt
updateConnectionTimes := func() error {
err = api.Database.UpdateWorkspaceAgentConnectionByID(r.Context(), database.UpdateWorkspaceAgentConnectionByIDParams{
ID: workspaceAgent.ID,
FirstConnectedAt: firstConnectedAt,
LastConnectedAt: lastConnectedAt,
DisconnectedAt: disconnectedAt,
})
if err != nil {
return err
}
return nil
}
build, err := api.Database.GetWorkspaceBuildByJobID(r.Context(), resource.JobID)
if err != nil {
_ = conn.Close(websocket.StatusAbnormalClosure, err.Error())
return
}
// Ensure the resource is still valid!
// We only accept agents for resources on the latest build.
ensureLatestBuild := func() error {
latestBuild, err := api.Database.GetWorkspaceBuildByWorkspaceIDWithoutAfter(r.Context(), build.WorkspaceID)
if err != nil {
return err
}
if build.ID.String() != latestBuild.ID.String() {
return xerrors.New("build is outdated")
}
return nil
}
defer func() {
disconnectedAt = sql.NullTime{
Time: database.Now(),
Valid: true,
}
_ = updateConnectionTimes()
}()
err = ensureLatestBuild()
if err != nil {
_ = conn.Close(websocket.StatusGoingAway, "")
return
}
err = updateConnectionTimes()
if err != nil {
_ = conn.Close(websocket.StatusAbnormalClosure, err.Error())
return
}
api.Logger.Info(r.Context(), "accepting agent", slog.F("resource", resource), slog.F("agent", workspaceAgent))
ticker := time.NewTicker(api.AgentConnectionUpdateFrequency)
defer ticker.Stop()
for {
select {
case <-session.CloseChan():
return
case <-ticker.C:
lastConnectedAt = sql.NullTime{
Time: database.Now(),
Valid: true,
}
err = updateConnectionTimes()
if err != nil {
_ = conn.Close(websocket.StatusAbnormalClosure, err.Error())
return
}
err = ensureLatestBuild()
if err != nil {
// Disconnect agents that are no longer valid.
_ = conn.Close(websocket.StatusGoingAway, "")
return
}
}
}
}
func (api *api) workspaceAgentICEServers(rw http.ResponseWriter, _ *http.Request) {
httpapi.Write(rw, http.StatusOK, api.ICEServers)
}
// workspaceAgentTurn proxies a WebSocket connection to the TURN server.
func (api *api) workspaceAgentTurn(rw http.ResponseWriter, r *http.Request) {
api.websocketWaitMutex.Lock()
api.websocketWaitGroup.Add(1)
api.websocketWaitMutex.Unlock()
defer api.websocketWaitGroup.Done()
localAddress, _ := r.Context().Value(http.LocalAddrContextKey).(*net.TCPAddr)
remoteAddress := &net.TCPAddr{
IP: net.ParseIP(r.RemoteAddr),
}
// By default requests have the remote address and port.
host, port, err := net.SplitHostPort(r.RemoteAddr)
if err != nil {
httpapi.Write(rw, http.StatusBadRequest, httpapi.Response{
Message: fmt.Sprintf("get remote address: %s", err),
})
return
}
remoteAddress.IP = net.ParseIP(host)
remoteAddress.Port, err = strconv.Atoi(port)
if err != nil {
httpapi.Write(rw, http.StatusBadRequest, httpapi.Response{
Message: fmt.Sprintf("remote address %q has no parsable port: %s", r.RemoteAddr, err),
})
return
}
wsConn, err := websocket.Accept(rw, r, &websocket.AcceptOptions{
CompressionMode: websocket.CompressionDisabled,
})
if err != nil {
httpapi.Write(rw, http.StatusBadRequest, httpapi.Response{
Message: fmt.Sprintf("accept websocket: %s", err),
})
return
}
defer func() {
_ = wsConn.Close(websocket.StatusNormalClosure, "")
}()
netConn := websocket.NetConn(r.Context(), wsConn, websocket.MessageBinary)
api.Logger.Debug(r.Context(), "accepting turn connection", slog.F("remote-address", r.RemoteAddr), slog.F("local-address", localAddress))
select {
case <-api.TURNServer.Accept(netConn, remoteAddress, localAddress).Closed():
case <-r.Context().Done():
}
api.Logger.Debug(r.Context(), "completed turn connection", slog.F("remote-address", r.RemoteAddr), slog.F("local-address", localAddress))
}
func convertWorkspaceAgent(dbAgent database.WorkspaceAgent, agentUpdateFrequency time.Duration) (codersdk.WorkspaceAgent, error) {
var envs map[string]string
if dbAgent.EnvironmentVariables.Valid {
err := json.Unmarshal(dbAgent.EnvironmentVariables.RawMessage, &envs)
if err != nil {
return codersdk.WorkspaceAgent{}, xerrors.Errorf("unmarshal: %w", err)
}
}
workspaceAgent := codersdk.WorkspaceAgent{
ID: dbAgent.ID,
CreatedAt: dbAgent.CreatedAt,
UpdatedAt: dbAgent.UpdatedAt,
ResourceID: dbAgent.ResourceID,
InstanceID: dbAgent.AuthInstanceID.String,
Name: dbAgent.Name,
Architecture: dbAgent.Architecture,
OperatingSystem: dbAgent.OperatingSystem,
StartupScript: dbAgent.StartupScript.String,
EnvironmentVariables: envs,
}
if dbAgent.FirstConnectedAt.Valid {
workspaceAgent.FirstConnectedAt = &dbAgent.FirstConnectedAt.Time
}
if dbAgent.LastConnectedAt.Valid {
workspaceAgent.LastConnectedAt = &dbAgent.LastConnectedAt.Time
}
if dbAgent.DisconnectedAt.Valid {
workspaceAgent.DisconnectedAt = &dbAgent.DisconnectedAt.Time
}
switch {
case !dbAgent.FirstConnectedAt.Valid:
// If the agent never connected, it's waiting for the compute
// to start up.
workspaceAgent.Status = codersdk.WorkspaceAgentConnecting
case dbAgent.DisconnectedAt.Time.After(dbAgent.LastConnectedAt.Time):
// If we've disconnected after our last connection, we know the
// agent is no longer connected.
workspaceAgent.Status = codersdk.WorkspaceAgentDisconnected
case agentUpdateFrequency*2 >= database.Now().Sub(dbAgent.LastConnectedAt.Time):
// The connection updated it's timestamp within the update frequency.
// We multiply by two to allow for some lag.
workspaceAgent.Status = codersdk.WorkspaceAgentConnected
case database.Now().Sub(dbAgent.LastConnectedAt.Time) > agentUpdateFrequency*2:
// The connection died without updating the last connected.
workspaceAgent.Status = codersdk.WorkspaceAgentDisconnected
}
return workspaceAgent, nil
}